CA1304495C - Remote programming of catv channel authorization unit - Google Patents
Remote programming of catv channel authorization unitInfo
- Publication number
- CA1304495C CA1304495C CA000544792A CA544792A CA1304495C CA 1304495 C CA1304495 C CA 1304495C CA 000544792 A CA000544792 A CA 000544792A CA 544792 A CA544792 A CA 544792A CA 1304495 C CA1304495 C CA 1304495C
- Authority
- CA
- Canada
- Prior art keywords
- data
- channel
- authorization
- cable television
- format
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/222—Secondary servers, e.g. proxy server, cable television Head-end
- H04N21/2225—Local VOD servers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/482—End-user interface for program selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
Abstract
REMOTE PROGRAMMING OF
CATV CHANNEL AUTHORIZATION UNIT
ABSTRACT OF THE DISCLOSURE
Method and apparatus is disclosed for programming a CATV
channel authorization unit. In a cable television (CATV) system, a CATV transmitter provides a plurality of CATV system channels to a channel authorization unit which in turn supplies only selected ones of the system channels to a user. The CATV authorization unit determines which selected channels the user will receive by receiv-ing channel authorization data from a CATV system programmer.
The channel authorization data is received via an infrared data com-munication link such that programming can be done without physical disassembly of the CATV channel authorization unit and without the system programmer being physically present within the users house-hold. In a further embodiment. the CATV channel authorization unit is also responsive to a user transmitter for determining which of the selected channels the user is presently viewing.
CATV CHANNEL AUTHORIZATION UNIT
ABSTRACT OF THE DISCLOSURE
Method and apparatus is disclosed for programming a CATV
channel authorization unit. In a cable television (CATV) system, a CATV transmitter provides a plurality of CATV system channels to a channel authorization unit which in turn supplies only selected ones of the system channels to a user. The CATV authorization unit determines which selected channels the user will receive by receiv-ing channel authorization data from a CATV system programmer.
The channel authorization data is received via an infrared data com-munication link such that programming can be done without physical disassembly of the CATV channel authorization unit and without the system programmer being physically present within the users house-hold. In a further embodiment. the CATV channel authorization unit is also responsive to a user transmitter for determining which of the selected channels the user is presently viewing.
Description
~3(~ 9~i REMOTE PROGRAMMING OF
CATV CHANNEL AUTHORIZATION UNIT
BACKGROUND OF THE INVENTION
The present invention is directed in general toward remote control apparatus and, more particularly, toward method and appa-ratus for programming the selected ones of a plurality of CATV
channels which a user is authorized to receive.
Cable television (CATV) has become very popular in recen~
years. This is primarily due to the improved quality of audioivisual reception provided by CATV transmitters along with the increased channel selection which is provided.~
-~ Conventional means for providing CATV service to a user relies upon a channel authorization unit located witbin the user~s residence (usually in close proximity to the user~s television set) to insure that the user receives only channels he is authorized to recéive. The channel authorization~ unit receives a plurality of CATV system channels supplied by the CATV transmitter~via a dedi-cated communication link. The channel authorization unit is provid-~
ed for supplying a plurality of selected channels to the user, which selected channels are those CATV system channels that the particu-lar user is authorized to receive. Typically, the signals provided~to the channel authorization uniC are provided in a scrambled fashion ,:
.
.
.
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to prevent the us~r from bypassing the channel authorization unit and pirating unauthorized channels. Therefore, the channei authori-zation unit is also adapted to perform a descramble function such that the signal provided to the user~s television set is in proper form.
In order to screen channels such ~hat the user only receives those selected channels which he has been authorized to receive, the channel authorization unit is typically preprogrammed by a system programmer before being installed in the user~s residence. This prograrnrning is usually done by programming a programmable read only memory (PROM), or other similar devlce, which device is then physically installed within the user~s channel authorlzation unit.
However, this method requires tlme for the system programmer to disassemble the authorization unit and install the PROM device with the newly authorized channeLs. Further, because these systems require replaceable programmable read only memories, a black ma~
ket has developed wherein a user can obtain programmed memories from sources other than hi~ CATV supplier. The user then installs the black market programmable read only memory in his unit such that he can receive channels for which he is not authorized.
1~ is, therefor@, deslrable to provide method and apparatus for programming a channel authorization uhit which method and appa-ratus does not reguire physical disassembly of the unit. Additionally, it is de~irable to provide a channel authorization unit which is not susceptible to piracy of unautborized CATV channels.
It is, therefore, an cbject of an aspect of ~e present invention to prwide method and apparatus for programning a CP~V diannel authorization unlt.
- , ~l.3~
It is an object of an aspect of the present invention to provide method and apparatus for programming a CATV channel authorization unit which does not require physical disassembly of the unit.
It is an object of an asp~ct of the preeent invention to provide a CATV channel authorization unit which is not susceptible to piracy of unauthorized channels.
It is an object of an aspect of the present invention to provide method and apparatus for programming a channel authorization unit which allows programming to be performed quickly and e~ficiently.
Various aspects of the invention are as follows:
Programming apparatus for remotely programming a cable tslevision channel authorization unit of a cable television terminal with channel authorization data, the channel authorization unit of the cable television te~minal operable ~or selecting one channel from a predetermined canfiguration of authorized scra~bled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system and responsive to user control via a space data communications link to the tsrminal, the programming apparatus comprising:
data entry means for producing the predetermined ~: conf~guration representin~ æaid channels authorization data, the data entry means being re ponsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data via the space data communication link to the terminal and ~ first data proces ing means having associated first : memory means responsive to said data entry means for : 35 producing the channel configuration authorization data, ~ said data processing means encoding the produced channel .':
:
, ~ ~
~ ' 3a configuration data for transmission by the transmission means to a receiver means of the terminal; and the receiver means of the terminal for receiving the channel configuration authorization data; said receiver comprising:
second data processing means having associated second memory means, the data processing means responsive to the channel configuration authorization data received at said receiver means for updating the channel authorization data recorded in said second memory means, the cable television channel authorization unit responsive to the data processing means providing a user with access to those channels prescribed by the recorded channel authorization data.
Programming apparatus for remotely programming a cable television channel authorization unit of a cable television terminal, the channel authorization unit operable for selecting one channel from a predetermined confi.guration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system responsive to user control via a space data communication link to the terminal, the programming apparatus comprising:
data storage means;
data entry means for producing channel authorization, channel configuration, channel selection and control data from a cable television programmer;
data processing means responsive to said data entry means for storing a plurality of combination of channel configuration data in said data storage means wherein each combination represents a configuration of authorized channels, said data processing means being responsive to control data signals received from said data entry means ~or encoding one o~ the plurality o~
stored combinations ~or transmission to said cabla television channel authorization unit via the space data communication link, said d~ta processing means being ~3~
3b further responsive to control signals received from said data entry means for transmitting channel authorization data produced by said data entry means in a ~irst format an the channel selection in a second format to said cable television channel authorization unit via the space data communication link.
Programming apparatu~ for remotely progra~ming a cable television channel authorization unit of a cable television terminal over a first space data 1o communications link, the channel authorization unit including a receiver operable for receiving data indicating one channel from a configuration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission : system, said data being transmit ed in a first format from a user via a second pace data communication link to the receiver, said programming apparatus comprising-data entry means for producing channel con~iguration authorization data from a system programmer and for transmitting the channel ~: configuration data to said receiver in a second format via the first space data communications link:
the data entry mean comprising:
means for transmitting data in the first format to the receiver of the cable television channel . ~ authorization unit;
first data processing means having associated first memory means responsive to the channel configuration authorization data from the system prsgrammer for encoding the channel configuration authorization data in ~: the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal o~ a predetermined ~requency; and means for modulating the encoded data in tha second format with the carrier signal to be transmitted to the ',~
;
, :~, 3c ~?9L~j cable television channel authorization unit, and the cable television authorization unit comprising a second data procecsing means coupled to said receiver and responsive to data received in the second format for preventing the user of the cable television channel authorization unit from receiving unauthorized channels, said second data processing means being responsive ~o data receiv~d in the first format for changing the channel which the user is presently0 viawing.
Apparatus for providing user with a particular authorized configuration of selected cable television system channels ~rom among a plurality of scrambled or unscrambled cable television system channels comprising:
a cable television terminal comprising:
channel authorization means for descrambling the authorized plurality of scrambled cable television system channels, said channel authorization means being coupled to a user's television terminal and providing the authorized configuration from the plurality o~
selected cable television channels thereto;
means for receiving channel configuration authorization data in a first format via a space data communication link, said receiving means bPing coupled to said channel authorization mean~ for providing channel authorization data received over the space data communication link to said authorization means; and remote programming apparatus comprising:
data entry mQans for producing channel configuration authorization data, said data entry means being adapted to transmit the channel configuration authori2ation in the fir~t format to said data receive means via the space data communications link, said channel authorization means being responsive to the channel con~iguration authorization data for enabling the descrambling of scra~bled channels o~ th2 authorized coniguration of cable television system channel~ to be supplied to ths user's television terminal, cable .
:L3l~
3d television channel selection data being transmitted in a second format, via the space data co~munications link.
A method for programming a cabla television channel authorization unit of a cable television terminal from remote control programming apparatus over a first space data communications link comprising the steps of:
(a) providing channel configuration data which speci~ie~ which ones of a plurality of scrambled or unscrambled cable television system channels a user is authorized to receive;
(b) translating the provided channel configuration data into channel authorization data for transmission in a first format over the first space data commu~ications link;
(c) transmitting the channel authorization data in the first format to the cable television channel authorization unit via the first space data communication link;
(d) receiving the channel authorization data and storing the channel authorization data with associated data as to the scrambled or unscrambled character o~ the authorized channel;
: (e) responding to the stored channel authorization data to enable the ussr to receive only those scrambled or unscra~bled cable television system ; channels specified by the channel authorization data; and (~ responding to user channel selection data for selecting a scrambled channel by descrambling the selected scrambled channel only if the selected channel is authorized, the channel:selection data being transmitted in a second format over a ~econd space data communication link.
: Progra~ming apparatus for remotely, programming a ~` 35 cable televi ion channel authorization unit of a cable television terminal with channel authorization data and feature data, the chann~l authorization unit of the cable televi~ion terminal operable responsive to user :
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3e ~L3~?'~3,~
control for selecting one channel from a predetermined configuration of authorization scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission sy~tem for display, the programming apparatus comprising:
data entry means for producing the predetermined configuration representing said channel authorization data and the feature data, the data entry means being responsive to programmer control;
transmission mean~ responsive to said data entry means for transmitting the channel authorization configuration data and the feature data via an infra red data communications link to the cable television terminal; and data processing means having associated memory means, the data processing means responsive to said data entry means for producing the channel con~iguration authorization data and the feature ~ata, the data
CATV CHANNEL AUTHORIZATION UNIT
BACKGROUND OF THE INVENTION
The present invention is directed in general toward remote control apparatus and, more particularly, toward method and appa-ratus for programming the selected ones of a plurality of CATV
channels which a user is authorized to receive.
Cable television (CATV) has become very popular in recen~
years. This is primarily due to the improved quality of audioivisual reception provided by CATV transmitters along with the increased channel selection which is provided.~
-~ Conventional means for providing CATV service to a user relies upon a channel authorization unit located witbin the user~s residence (usually in close proximity to the user~s television set) to insure that the user receives only channels he is authorized to recéive. The channel authorization~ unit receives a plurality of CATV system channels supplied by the CATV transmitter~via a dedi-cated communication link. The channel authorization unit is provid-~
ed for supplying a plurality of selected channels to the user, which selected channels are those CATV system channels that the particu-lar user is authorized to receive. Typically, the signals provided~to the channel authorization uniC are provided in a scrambled fashion ,:
.
.
.
~: ` :
:,:
. .
~L3~
to prevent the us~r from bypassing the channel authorization unit and pirating unauthorized channels. Therefore, the channei authori-zation unit is also adapted to perform a descramble function such that the signal provided to the user~s television set is in proper form.
In order to screen channels such ~hat the user only receives those selected channels which he has been authorized to receive, the channel authorization unit is typically preprogrammed by a system programmer before being installed in the user~s residence. This prograrnrning is usually done by programming a programmable read only memory (PROM), or other similar devlce, which device is then physically installed within the user~s channel authorlzation unit.
However, this method requires tlme for the system programmer to disassemble the authorization unit and install the PROM device with the newly authorized channeLs. Further, because these systems require replaceable programmable read only memories, a black ma~
ket has developed wherein a user can obtain programmed memories from sources other than hi~ CATV supplier. The user then installs the black market programmable read only memory in his unit such that he can receive channels for which he is not authorized.
1~ is, therefor@, deslrable to provide method and apparatus for programming a channel authorization uhit which method and appa-ratus does not reguire physical disassembly of the unit. Additionally, it is de~irable to provide a channel authorization unit which is not susceptible to piracy of unautborized CATV channels.
It is, therefore, an cbject of an aspect of ~e present invention to prwide method and apparatus for programning a CP~V diannel authorization unlt.
- , ~l.3~
It is an object of an aspect of the present invention to provide method and apparatus for programming a CATV channel authorization unit which does not require physical disassembly of the unit.
It is an object of an asp~ct of the preeent invention to provide a CATV channel authorization unit which is not susceptible to piracy of unauthorized channels.
It is an object of an aspect of the present invention to provide method and apparatus for programming a channel authorization unit which allows programming to be performed quickly and e~ficiently.
Various aspects of the invention are as follows:
Programming apparatus for remotely programming a cable tslevision channel authorization unit of a cable television terminal with channel authorization data, the channel authorization unit of the cable television te~minal operable ~or selecting one channel from a predetermined canfiguration of authorized scra~bled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system and responsive to user control via a space data communications link to the tsrminal, the programming apparatus comprising:
data entry means for producing the predetermined ~: conf~guration representin~ æaid channels authorization data, the data entry means being re ponsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data via the space data communication link to the terminal and ~ first data proces ing means having associated first : memory means responsive to said data entry means for : 35 producing the channel configuration authorization data, ~ said data processing means encoding the produced channel .':
:
, ~ ~
~ ' 3a configuration data for transmission by the transmission means to a receiver means of the terminal; and the receiver means of the terminal for receiving the channel configuration authorization data; said receiver comprising:
second data processing means having associated second memory means, the data processing means responsive to the channel configuration authorization data received at said receiver means for updating the channel authorization data recorded in said second memory means, the cable television channel authorization unit responsive to the data processing means providing a user with access to those channels prescribed by the recorded channel authorization data.
Programming apparatus for remotely programming a cable television channel authorization unit of a cable television terminal, the channel authorization unit operable for selecting one channel from a predetermined confi.guration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system responsive to user control via a space data communication link to the terminal, the programming apparatus comprising:
data storage means;
data entry means for producing channel authorization, channel configuration, channel selection and control data from a cable television programmer;
data processing means responsive to said data entry means for storing a plurality of combination of channel configuration data in said data storage means wherein each combination represents a configuration of authorized channels, said data processing means being responsive to control data signals received from said data entry means ~or encoding one o~ the plurality o~
stored combinations ~or transmission to said cabla television channel authorization unit via the space data communication link, said d~ta processing means being ~3~
3b further responsive to control signals received from said data entry means for transmitting channel authorization data produced by said data entry means in a ~irst format an the channel selection in a second format to said cable television channel authorization unit via the space data communication link.
Programming apparatu~ for remotely progra~ming a cable television channel authorization unit of a cable television terminal over a first space data 1o communications link, the channel authorization unit including a receiver operable for receiving data indicating one channel from a configuration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission : system, said data being transmit ed in a first format from a user via a second pace data communication link to the receiver, said programming apparatus comprising-data entry means for producing channel con~iguration authorization data from a system programmer and for transmitting the channel ~: configuration data to said receiver in a second format via the first space data communications link:
the data entry mean comprising:
means for transmitting data in the first format to the receiver of the cable television channel . ~ authorization unit;
first data processing means having associated first memory means responsive to the channel configuration authorization data from the system prsgrammer for encoding the channel configuration authorization data in ~: the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal o~ a predetermined ~requency; and means for modulating the encoded data in tha second format with the carrier signal to be transmitted to the ',~
;
, :~, 3c ~?9L~j cable television channel authorization unit, and the cable television authorization unit comprising a second data procecsing means coupled to said receiver and responsive to data received in the second format for preventing the user of the cable television channel authorization unit from receiving unauthorized channels, said second data processing means being responsive ~o data receiv~d in the first format for changing the channel which the user is presently0 viawing.
Apparatus for providing user with a particular authorized configuration of selected cable television system channels ~rom among a plurality of scrambled or unscrambled cable television system channels comprising:
a cable television terminal comprising:
channel authorization means for descrambling the authorized plurality of scrambled cable television system channels, said channel authorization means being coupled to a user's television terminal and providing the authorized configuration from the plurality o~
selected cable television channels thereto;
means for receiving channel configuration authorization data in a first format via a space data communication link, said receiving means bPing coupled to said channel authorization mean~ for providing channel authorization data received over the space data communication link to said authorization means; and remote programming apparatus comprising:
data entry mQans for producing channel configuration authorization data, said data entry means being adapted to transmit the channel configuration authori2ation in the fir~t format to said data receive means via the space data communications link, said channel authorization means being responsive to the channel con~iguration authorization data for enabling the descrambling of scra~bled channels o~ th2 authorized coniguration of cable television system channel~ to be supplied to ths user's television terminal, cable .
:L3l~
3d television channel selection data being transmitted in a second format, via the space data co~munications link.
A method for programming a cabla television channel authorization unit of a cable television terminal from remote control programming apparatus over a first space data communications link comprising the steps of:
(a) providing channel configuration data which speci~ie~ which ones of a plurality of scrambled or unscrambled cable television system channels a user is authorized to receive;
(b) translating the provided channel configuration data into channel authorization data for transmission in a first format over the first space data commu~ications link;
(c) transmitting the channel authorization data in the first format to the cable television channel authorization unit via the first space data communication link;
(d) receiving the channel authorization data and storing the channel authorization data with associated data as to the scrambled or unscrambled character o~ the authorized channel;
: (e) responding to the stored channel authorization data to enable the ussr to receive only those scrambled or unscra~bled cable television system ; channels specified by the channel authorization data; and (~ responding to user channel selection data for selecting a scrambled channel by descrambling the selected scrambled channel only if the selected channel is authorized, the channel:selection data being transmitted in a second format over a ~econd space data communication link.
: Progra~ming apparatus for remotely, programming a ~` 35 cable televi ion channel authorization unit of a cable television terminal with channel authorization data and feature data, the chann~l authorization unit of the cable televi~ion terminal operable responsive to user :
`
3e ~L3~?'~3,~
control for selecting one channel from a predetermined configuration of authorization scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission sy~tem for display, the programming apparatus comprising:
data entry means for producing the predetermined configuration representing said channel authorization data and the feature data, the data entry means being responsive to programmer control;
transmission mean~ responsive to said data entry means for transmitting the channel authorization configuration data and the feature data via an infra red data communications link to the cable television terminal; and data processing means having associated memory means, the data processing means responsive to said data entry means for producing the channel con~iguration authorization data and the feature ~ata, the data
2 0 processing means encoding the produced channel configuration authorization data and the feature data into a first format ~or transmission by the transmission means, the first format being a different format from a second ~ormat for data for selecting a channel to be 25 displayed, an infra-red data receiver of the cable tel~vision terminal operable ~o receive data in either the first or the second format.
By way of added explanation, the foregoing and other objects of the pre ent invention are met by 30 providing apparatus and method for programming a CAqV
channel authorization unit with channel authorization dataO The apparatus includes data entry mean~ for receiving channel authorization data ~rom the system programmer. Tran~mission means are coupled to the data 35 entry means for transmitting channel authorization data to the channel authorization unit via an infra-red data communication link. The channel authorization unit includes a receiver for receiving the channel 3f ~ 4~
authorization data and data processing means coupled to the receiver for recording the channel authorization data such that the user of the CATV channel authorization unit is only able to receive those channels prescribed by the channel authorization data.
Further, in accordance with the present invention, the channel authorization unit is adapted to receive data from the systam programmer in a Pirst format and data from the user in a second format. The channel authorization unit responds to data received in the first format for enabling the user to receive selected ones of the plurality of CATV channels available. The CATV channel authorization unit responds to data xeceived in the second format to select -4- ~3~ $
the one of the authorized channels which is to be provided to the user. In this manner, the user is provided with remote control of the CATV authorization unit but is nonetheless unable to control which stations the CATV authorization unit will enable him to receive.
In a further embodiment, the programmer data entry terminal includes means for storing a plurality of channel configurations such that programming a user channel authorization unit with one of the stored configurations eliminates the need for the programmer to first provide detailed programming information to the data entry terminal.
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects, advantages and features of the invention will become apparent from a reading of the following detailed description taken in conjunction with the drawings in which:
Figure l is an illustrative block diagram of the CATV channel authorization system in accordance with the present invention;
Figure 2 is a more detailed illustrative block diagram of the programmer data entry terminal illustrated in Figure 1;
Figures 3A and 3~ show the modulation patterns for a logical one and zero, respectively;
Figure 4 is a more detailed schematic diagram of the data transmitter illustrated in Figure 1;
Figure 5 is a more detailed illustrative block diagram of the CATV channel authorization unit of Figure 1;
Figure 6A is a more detailed block diagram of the receiver of Figure 5;
Figure 6B is a more detailed block diagram of the discriminator of Figure 5; and Figure 6C is a more detailed block diagram of the interface of Figure 5.
DETAILED DESCRIPTION OF_THE PREF RED EMBODIMENT
~s mentioned hereinabove, the present invention is directed toward method and appara*us ~or programming a user channel authorization unit. With reference to ::~
~ .
;~3~
Figure l, there is shown a CATV channel authorization unit 100 which is coupled to receive a plurality of CATV
system channels from a CATV transmitter 102 via a dedicatPd connection. CATV channel authorization unit lO0 supplies a plurality of selected channels to a user's television terminal 104. Hence, CATV channel authorization unit 100 is provided to ensure that the user only receives that portion of the CATV system channels transmitted by transmitter 102 which the user is authorized to receive.
To determine which selected channels a user is authorized to receive, CATV channel authorization unit 100 receives channel authorization data from a CATV
system programmer via programmer data entry terminal 106, data transmitter 108 and an infrared data communication link. Programmer data entry terminal 106 is provided for receiving channel authorization data, from the CATV system programmer and for encoding the received channel authorization data to be transmitted to C~TV channel authorization unit 100 via data transmitter 10~. Data transmitter 108 is provided for receiving transmission data from data entry terminal 106 and transmitting the data to CATV channel authorization unit 100 via an infrared data communication link.
~5 In a further embodiment, CATV channel authorization unit 10~ may be responsive to a user transmitter 110 for changing the one of the selected channels which the user is presently viewing.
:, , : .
In this embodiment, pro~rammer data transmitter 108 is adapted to transmit data in a first format while user transmitter 110 is adapted to transmit data in a second format. As used herein, data format is intended to include all means and methods for distinguishing data transmissions. For example, data transmissions can be distinguished by altering: the mode of transmitter operation; the type of data which is transmitted; or altering the way in which data is encoded.
It will be apparent to those skilled in the art that many other meth-ods may be employed for distinguishing data transmissions. In the present embodiment, transmissions are distinguished by limiting the type OI data transmitter 110 is adapted to transmit. In this manner the user has remote control over his viewing selection but is unable to alter the selected channels which he is enabled to receive.
With reference to Figure 2, there is provided a more detailed illustrative block diagram of data entry terminal lD6. Therein, data entry terminal 106 is shown to comprise a microprocessor 200 for performing the data proces~sing functions of the terminal, as will be described below. Microprocessor 200 may comprise any computing device, including all necessary peripheral devices, for performing the data processing and control functions described herein.
Microprocessor 200 is adapted to communicate with a CATV
system programmer via a keypad and switches 202. Also, microprocessor 200 is adapted to provide data entry terminal status information to the CATV system programmer via latch 204, LED
display 206, alphanumeric display 208 and decoder 210. Keypad 202, latch 204 and LEDs 206 may comprise any conventional devices for performing the named functions, as is known in the art. Alpha-numeric display 2û8 comprises a plurality of seven-segment displays coupled to respective driver devices for receiving information from ~'~
, :
' ' ~. '' ' ':
~3~ 5 microprocessor 200 and providing an alphanumeric display there-f rom .
Microprocessor 200 is adapted to control the operation of keypad 202, latch 204 and alphanumeric display 208 via a binary coded decimal (BCD) decoder 210. BCI) decoder 210 may comprise any means for receiving a binary coded decimal input from `~ microprocessor 200 and providing a plurality of control outputs to ~eypad 202, latch 204 and alphanumeric display 208. Further, decoder 210 need not comprise a BCD device but may comprise any means for allowing microprocessor 200 to control, or communicate with, the selected data entry devices.
It will be appreciated by those skilled in the art that the apparatus for interfacing the CATV operator with data entry terminal 106 need not consist of the aforementioned devices but may consist of a number of various arrangements for receiving data from and providing system status information to the CATV system pro-grammer. As an example, keypad 202, latch 204 and LEDs 206 may comprise a personal computer interfaced to communicate with microprocessor 200 to allow communication between the program-mer and microprocessor 200.
Microprocessor 200 is also shown coupled to memory 212.
Memory 212 is provided for storing channel configuration data and system program data. Memory 212 may comprise random access memory as well as read only memory and/or programmable read only memory, as is known in the art. Additionally, memory 212 may com-prise any necessary peripheral devices for enabling operation with microprocessor 200. It will be apparent to ~hose skilled in the art that memory 212 may be integrated with microprocessor 200 in whole nr in part. In the presen~ly preferred embodiment, a portion , .
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of memory 212 comprises random access memory (RAM) and is inte-grated with microproces~sor 200. The remainder of n emory 212 comprises electrically erasabla programmable read only memory (EEPROM) and is not integrated with microprocessor 200.
In an alternative embodiment, data entry terminal 106 may be adapted to store a plurality of chann~l configurations to thereby eliminate the need for the system programmer to reprogram stan-dard configurations before transmission. In such an embodiment, memory 212 may be adapted to store the plurality of channel config-urations in addition to storing the data discussed above. Further, in this embodiment micrnprocessor 200 may b~ adapted to respond to appropriate command signals received from the system programmer to transmit a selected one of the stored channel configurations to channel autholoization unit 100 (Figure 1).
Microprocessor 200 provides transmission data to data transmitter 108 (Figure 1) via first and second flip flops 214 and 21~, and latch 204. In the preferred embodiment, data is transmitted by modulating the duration of a digital infrared carrier signal. Hence, microprocessor 200 controls the output of second flip flo2 21S via its reset input to modulate the duration of the digital carrier signal sup-plied to da~a transmitter 108. The carrier modulation patterns which correspond to a logical one and zero are shown in Figures 3A
and 3B, respectively.
In operation, the system programmer provides channel autho-rization data to microprocessor 200 via keypad and switches 202.
The system operator monitors alphanumeric display 208 and LED dis-play 206 ~o determine the operational status of data entry terminal 106 as data is provided to microprocessor 200 via keypad 202. Microprocessor 200 receives the channel authorization data , ~
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and formats this data for transmission to channel authorization unit 100. Thereafter, the data is stored in memory 212 until transmission is initiated. To initiate tr~nsmission, the programmer activates transmitter 108 which provides a transmit signal to data entry terminal 106 via the INT input of microprocessor 200. Microprocessor 200 then controls latch 204 to provide transmission data to the reset input of second flip flop 216. In this manner the carrier signal, provided by ALE output of microprocessor 200, is modulated with data via the reset input of second flip flop 216 to provide the modulated duration digital infrared transmission signal which will be provided to channel authorization unit 100 via data transmitter 108 and the infrared data communication link.
With reference to Figure 4, there is shown a schematic diagram of digital transmitter 108. Digita~-transmitter lOB comprises a transistor 300 having its base coupled to receive the modulated carrier from data entry terminal 106. An infrared light emitting diode 302 is coupled intermediate transistor 300 and a 5 volt power source for providing the infrared data signal to be transmitted to CATV channel authorixation unit 100 (Figure 1). When closed, switch 304 provides the transmit signal to the INT input of microprocessor 200 (Figure 2). Microprocessor 200 then provides data to be transmitted to flip flop 216 via latch 204 as described above. The output of flip flop ~16 is connected to the base of transistor 300 causing it to switch on and off as necessary to generate the carrier signal of appropriate frequency, modulated with the desired data.
When transistor 300 is switched on current flows through infrared LED 302, thus generating an infrared signal at the carrier frequency. Switch 306 is used to adjust the current flow through infrared LED 302 to either a high or low level thus adjusting the power of transmitted infrared signal.
It will be apparent to those skilled in the art that while the present invention is described herein as modulated duration, infrared, digital communication, .
, other forms of electromagnetic data communication would work equally as well. As an example, the present invention could be implemented using microwave, AM or FM
communication signals. It will be further apparent to those skilled in the art that while the output of second flip flop 216 provides a carrier frequency of approximately 57 KHz for the modulated duration signal, the present invention could be suitably adapted for a carrier of any frequency including baseband ~0 communication.
With reference to Figure S, there is shown a more detailed illustrative block diayram of CATV channel authorization unit 100. Channel authorization unit loO
comprises a microprocessor 400 for performing data processing functionsl as will be described more fully below. ~icroprocessor 400, like microprocessor 200 may comprise any computing device, including all necessary, peripheral devices, for performing the data processing functions described herein.
Microprocessor 400 is in data communication with an infrared receiver 402 for receiving infrared data transmissions from data transmitter 108. IR receiver 402 may also be adapted to receive Infrared transmissions from a user transmitter 110 (Figure 1~ as described herein. IR receiver 402 may comprise any device known in the art for rec~iving infrared data transmissions. Alternatively, receiver 402 may comprise apparatus for receiving data in accordance with the chosen method of transmission. Also, should two 30 transmitters 108 and 110 be employed, receiver 402 may be adapted to receive data in two formats, e.g., at differing carrier frequencies, for distinguishing between transmitters as discussed above.
A typical block diagram for IR Receiver 402 is shown in Figure 6~. A photo diode 500, being sensitive to infrared light, provides a low level signal to a high gain amplifier 502. A limiter 504 is used in conjunction with amplifier 502 to provide a controlled signal level to a bandpass filter 506. The characteristics of bandpass filter 506 are chosen such : ~
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~l.3~4'~5 that only a signal in the frequency band used for the infrared carrier frequency may pass to a demodulator 508. When a signal passes through bandpass filter 506, demodulator 508 provides charge to integrator 510.
Integrator 510 accumulates this charge providing a voltage to comparator 512. If the signal is present for sufficient time, the voltage at the input of comparator 512 will rise to a level that triggers its digital output to change state. Thus the on/off modulation of the infrared carrier signal is demodulated and provided as baseband data to microprocessor 400 where software or other circuitry decodes the data into either data from the user transmitter or the programmer transmitter.
Microprocessor 400 is also in data communication with a channel discriminator ~04 via an interface 406.
Channel discriminator 404 is adapted to receive each of the plurality of CATV system stations from CATV
transmitter 102 and to provide the selected channels to user television terminal 104 (Figure 1), in responsa to channel authorization data received from microprocessor 400 via interface 406. Channel discriminator 404 and interface 406 may comprise conventional devices for : performing the aforedescribed functions, as is known in the art.
As shown in Figure 6B, discriminator 404 typically contains a voltage controlled oscillator (VC0) 514. A
mixer 516 is coupled to VC0 514 and is also coupled to receive the plurality of CATV system channels from CATV
transmitter 102 (Figure 1). The frequency of , ::' ~ ''' .
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VCO Sl4 is selected by a control signal received from interface 406 such that when the output of VCO 514 is mixed with the incoming RF spectrum from CATV tran~smitter 102, the desired channel is translated to a predetermined intermediate frequency (IF). The IF
signal is filtered, via filter 518, to remove any unwanted image fre-quencies that may have been introduced in the mixing process.
After filtering~ the IF signal is translated to the appropriate fre-quency necessary for the interface to user television terminal 104 (Figure l) by mixing the IF signal with the output of another ~scillator 520 in mixer 522. In this manner, the scrambled plurality of system channels received from CATV transmitter 102 is descrambled to the IF signal by VCO 514 and mixer 516 in response to control signaLs received from interface 406. The IF signal is then filtered and adapted for use by user television terminal lOg.
To provide the appropriate con~rol to VCO 514 from data received from microprocessor 400, interface 406 contains a phase locked loop circuit that is used to accurately control the frequency of VCO 514. This is accomplished by taking a portion of the output of YCO 514 (see Figure 6B) and9 by use of a frequency divider circuit 524 (Figure 5C), creating a sample frequency that is an inte-gral sub-multiple of the VCO frequency. The divisor used by the divider circuit is furnished to interface 405 by microprocessor 400 and is chosen such that the resulting sample frequency is equal to a reference frequency as determined by a crystal controlled reference oscillator 526. A phase detector 528 is used to compare the phase of the sample and reference frequencies. Its output i then integrated by integrator 530 to provide the control signal that is used to correct the frequency of VCO 514.
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Hence, in order to enable a user to receive a selected channel, micropro~essor 400 first determines whether the channel the user requesting to be provided is authorized. If so, appropriate divisor data is provided to interface 406. This data is used to control the output of VCO 514 to allow proper descrambling of the CATV transmitter signal. Other variations and implementations of this technique are well known in the art.
Microprocessor 400 is also in data communication with memory 408. Memory 408 is provided for storing channel authorization and system program data. Hence, memory 408, like memory 212 (Figure 2), may comprise random access memory, read only memory and/or programmable read only memory for performing this function. Also, microprocessor 400 may be in data communication with a user channel selector fo7 receiving a channel selection signal which is indicative of a particular channel which the user is requesting to be provided.
In operation, microprocessor 400 receives channel authorization data from a system programmer via data entry terminal 106, data transmitter 108 and IR receiver 404. Microprocessor 400 records this in~ormation in memory 408. When a user attempts to access a channel, microprocessor 400 first determines whether the channel being accessed is authorized by consulting memory 408 and, if so, allows the user to receive this channel via ; channel discriminator 404. Alternatively, should the user attempt to access a channel which is not ; authorized, then microprocessor 400 will provide an alternate channel, known as a barker channel, to the user via channel discriminator 404.
To authorize receipt o~ a selected channel, micro-processor 400 provides channel authorization data, whichdata .
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corresponds to the channel being requestecl, to interface 406.
Interface 406 receives a sample frequency from discriminator 404 and combines the sample with the authorization data from micro-processor 400 to provide a control signal to discriminator 404.
Discriminator 404 responds to the control data to properly descramble the signal received from the CATV transmitter and pro-vide the requested channel to the user television terminal.
It will be appreciated by those skilled in the art that the sys-tem described above can be used for programming the CATV autho-rization unit with data in addition to channel authorization data. As an example, this system can be used to provide parental guidance channel data such that a parent, guardian or other supervising adult can determine which of the selected channels children within the household will be unable to receive. In this regard, the above-described system can also be used for supplying the parental authorization code which enables the parentl guardian or supervising adult to access the parental guidance channels. Thus, the system programmer can program not only those channels which are pro-tected by parental guidance channel status but also can program the system with parental guidance authorization codes.
In a further embodimentl CATV channel authorization unit 100 is also responsive to a user transmitter 110 (Figure 1) for alter-ing the selected channel which the user is presently viewing. In such an embodimentl IR receiver 402 (Figure 4) is adapted to provide microprocessor ~00 with data received from both data transmitter 108 and user transmitter 110. Each transmission is provided by mod-ulating the duration of an infrared digital transmission signall as described hereinabove by reference to Figure 2. However, the .
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nature of information being transmitted is distinguished by the for-mat of the data transmission.
In the preferred embodiment, data is transmitted in packets having a header pulse of a specified duration, a five bit custom code, a six bit data word, the complement of the custom code and the complement of the data word. The six bit data word actually con-tains four bits of hexadecimal information data and two bits OI
descriptive data. The two bit descriptive data is used to determine whether the four bit information data comprises an address of mem-ory 408, a channel to be stored in an address of memory 408, control and error checking information to initiate the storage procedure or data to be retrieved from memory 408 and provided to the user via channel discriminator 404. User transmitter 110 is only enabled to transmit descriptive data in one format (that bein~ the format which instructs mlcroprocessor 400 to alter the ~annel being viewed) and, hence, is unable to program memory 408 with addition-al selected,channels. Conversely, data transmitter 108 is able to transmit under any format and, therefore, is able to perform any function.
While only several presently preferred embodiments of the foregoing novel method and apparatus have b~en described in detail herein, many modifications and variations thereof will readily become apparent to those skilled in the art. It is our intention, by the following claims, to embody all such modifications and variations as fall within the true scope and spirit of our invention.
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By way of added explanation, the foregoing and other objects of the pre ent invention are met by 30 providing apparatus and method for programming a CAqV
channel authorization unit with channel authorization dataO The apparatus includes data entry mean~ for receiving channel authorization data ~rom the system programmer. Tran~mission means are coupled to the data 35 entry means for transmitting channel authorization data to the channel authorization unit via an infra-red data communication link. The channel authorization unit includes a receiver for receiving the channel 3f ~ 4~
authorization data and data processing means coupled to the receiver for recording the channel authorization data such that the user of the CATV channel authorization unit is only able to receive those channels prescribed by the channel authorization data.
Further, in accordance with the present invention, the channel authorization unit is adapted to receive data from the systam programmer in a Pirst format and data from the user in a second format. The channel authorization unit responds to data received in the first format for enabling the user to receive selected ones of the plurality of CATV channels available. The CATV channel authorization unit responds to data xeceived in the second format to select -4- ~3~ $
the one of the authorized channels which is to be provided to the user. In this manner, the user is provided with remote control of the CATV authorization unit but is nonetheless unable to control which stations the CATV authorization unit will enable him to receive.
In a further embodiment, the programmer data entry terminal includes means for storing a plurality of channel configurations such that programming a user channel authorization unit with one of the stored configurations eliminates the need for the programmer to first provide detailed programming information to the data entry terminal.
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects, advantages and features of the invention will become apparent from a reading of the following detailed description taken in conjunction with the drawings in which:
Figure l is an illustrative block diagram of the CATV channel authorization system in accordance with the present invention;
Figure 2 is a more detailed illustrative block diagram of the programmer data entry terminal illustrated in Figure 1;
Figures 3A and 3~ show the modulation patterns for a logical one and zero, respectively;
Figure 4 is a more detailed schematic diagram of the data transmitter illustrated in Figure 1;
Figure 5 is a more detailed illustrative block diagram of the CATV channel authorization unit of Figure 1;
Figure 6A is a more detailed block diagram of the receiver of Figure 5;
Figure 6B is a more detailed block diagram of the discriminator of Figure 5; and Figure 6C is a more detailed block diagram of the interface of Figure 5.
DETAILED DESCRIPTION OF_THE PREF RED EMBODIMENT
~s mentioned hereinabove, the present invention is directed toward method and appara*us ~or programming a user channel authorization unit. With reference to ::~
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Figure l, there is shown a CATV channel authorization unit 100 which is coupled to receive a plurality of CATV
system channels from a CATV transmitter 102 via a dedicatPd connection. CATV channel authorization unit lO0 supplies a plurality of selected channels to a user's television terminal 104. Hence, CATV channel authorization unit 100 is provided to ensure that the user only receives that portion of the CATV system channels transmitted by transmitter 102 which the user is authorized to receive.
To determine which selected channels a user is authorized to receive, CATV channel authorization unit 100 receives channel authorization data from a CATV
system programmer via programmer data entry terminal 106, data transmitter 108 and an infrared data communication link. Programmer data entry terminal 106 is provided for receiving channel authorization data, from the CATV system programmer and for encoding the received channel authorization data to be transmitted to C~TV channel authorization unit 100 via data transmitter 10~. Data transmitter 108 is provided for receiving transmission data from data entry terminal 106 and transmitting the data to CATV channel authorization unit 100 via an infrared data communication link.
~5 In a further embodiment, CATV channel authorization unit 10~ may be responsive to a user transmitter 110 for changing the one of the selected channels which the user is presently viewing.
:, , : .
In this embodiment, pro~rammer data transmitter 108 is adapted to transmit data in a first format while user transmitter 110 is adapted to transmit data in a second format. As used herein, data format is intended to include all means and methods for distinguishing data transmissions. For example, data transmissions can be distinguished by altering: the mode of transmitter operation; the type of data which is transmitted; or altering the way in which data is encoded.
It will be apparent to those skilled in the art that many other meth-ods may be employed for distinguishing data transmissions. In the present embodiment, transmissions are distinguished by limiting the type OI data transmitter 110 is adapted to transmit. In this manner the user has remote control over his viewing selection but is unable to alter the selected channels which he is enabled to receive.
With reference to Figure 2, there is provided a more detailed illustrative block diagram of data entry terminal lD6. Therein, data entry terminal 106 is shown to comprise a microprocessor 200 for performing the data proces~sing functions of the terminal, as will be described below. Microprocessor 200 may comprise any computing device, including all necessary peripheral devices, for performing the data processing and control functions described herein.
Microprocessor 200 is adapted to communicate with a CATV
system programmer via a keypad and switches 202. Also, microprocessor 200 is adapted to provide data entry terminal status information to the CATV system programmer via latch 204, LED
display 206, alphanumeric display 208 and decoder 210. Keypad 202, latch 204 and LEDs 206 may comprise any conventional devices for performing the named functions, as is known in the art. Alpha-numeric display 2û8 comprises a plurality of seven-segment displays coupled to respective driver devices for receiving information from ~'~
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~3~ 5 microprocessor 200 and providing an alphanumeric display there-f rom .
Microprocessor 200 is adapted to control the operation of keypad 202, latch 204 and alphanumeric display 208 via a binary coded decimal (BCD) decoder 210. BCI) decoder 210 may comprise any means for receiving a binary coded decimal input from `~ microprocessor 200 and providing a plurality of control outputs to ~eypad 202, latch 204 and alphanumeric display 208. Further, decoder 210 need not comprise a BCD device but may comprise any means for allowing microprocessor 200 to control, or communicate with, the selected data entry devices.
It will be appreciated by those skilled in the art that the apparatus for interfacing the CATV operator with data entry terminal 106 need not consist of the aforementioned devices but may consist of a number of various arrangements for receiving data from and providing system status information to the CATV system pro-grammer. As an example, keypad 202, latch 204 and LEDs 206 may comprise a personal computer interfaced to communicate with microprocessor 200 to allow communication between the program-mer and microprocessor 200.
Microprocessor 200 is also shown coupled to memory 212.
Memory 212 is provided for storing channel configuration data and system program data. Memory 212 may comprise random access memory as well as read only memory and/or programmable read only memory, as is known in the art. Additionally, memory 212 may com-prise any necessary peripheral devices for enabling operation with microprocessor 200. It will be apparent to ~hose skilled in the art that memory 212 may be integrated with microprocessor 200 in whole nr in part. In the presen~ly preferred embodiment, a portion , .
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of memory 212 comprises random access memory (RAM) and is inte-grated with microproces~sor 200. The remainder of n emory 212 comprises electrically erasabla programmable read only memory (EEPROM) and is not integrated with microprocessor 200.
In an alternative embodiment, data entry terminal 106 may be adapted to store a plurality of chann~l configurations to thereby eliminate the need for the system programmer to reprogram stan-dard configurations before transmission. In such an embodiment, memory 212 may be adapted to store the plurality of channel config-urations in addition to storing the data discussed above. Further, in this embodiment micrnprocessor 200 may b~ adapted to respond to appropriate command signals received from the system programmer to transmit a selected one of the stored channel configurations to channel autholoization unit 100 (Figure 1).
Microprocessor 200 provides transmission data to data transmitter 108 (Figure 1) via first and second flip flops 214 and 21~, and latch 204. In the preferred embodiment, data is transmitted by modulating the duration of a digital infrared carrier signal. Hence, microprocessor 200 controls the output of second flip flo2 21S via its reset input to modulate the duration of the digital carrier signal sup-plied to da~a transmitter 108. The carrier modulation patterns which correspond to a logical one and zero are shown in Figures 3A
and 3B, respectively.
In operation, the system programmer provides channel autho-rization data to microprocessor 200 via keypad and switches 202.
The system operator monitors alphanumeric display 208 and LED dis-play 206 ~o determine the operational status of data entry terminal 106 as data is provided to microprocessor 200 via keypad 202. Microprocessor 200 receives the channel authorization data , ~
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and formats this data for transmission to channel authorization unit 100. Thereafter, the data is stored in memory 212 until transmission is initiated. To initiate tr~nsmission, the programmer activates transmitter 108 which provides a transmit signal to data entry terminal 106 via the INT input of microprocessor 200. Microprocessor 200 then controls latch 204 to provide transmission data to the reset input of second flip flop 216. In this manner the carrier signal, provided by ALE output of microprocessor 200, is modulated with data via the reset input of second flip flop 216 to provide the modulated duration digital infrared transmission signal which will be provided to channel authorization unit 100 via data transmitter 108 and the infrared data communication link.
With reference to Figure 4, there is shown a schematic diagram of digital transmitter 108. Digita~-transmitter lOB comprises a transistor 300 having its base coupled to receive the modulated carrier from data entry terminal 106. An infrared light emitting diode 302 is coupled intermediate transistor 300 and a 5 volt power source for providing the infrared data signal to be transmitted to CATV channel authorixation unit 100 (Figure 1). When closed, switch 304 provides the transmit signal to the INT input of microprocessor 200 (Figure 2). Microprocessor 200 then provides data to be transmitted to flip flop 216 via latch 204 as described above. The output of flip flop ~16 is connected to the base of transistor 300 causing it to switch on and off as necessary to generate the carrier signal of appropriate frequency, modulated with the desired data.
When transistor 300 is switched on current flows through infrared LED 302, thus generating an infrared signal at the carrier frequency. Switch 306 is used to adjust the current flow through infrared LED 302 to either a high or low level thus adjusting the power of transmitted infrared signal.
It will be apparent to those skilled in the art that while the present invention is described herein as modulated duration, infrared, digital communication, .
, other forms of electromagnetic data communication would work equally as well. As an example, the present invention could be implemented using microwave, AM or FM
communication signals. It will be further apparent to those skilled in the art that while the output of second flip flop 216 provides a carrier frequency of approximately 57 KHz for the modulated duration signal, the present invention could be suitably adapted for a carrier of any frequency including baseband ~0 communication.
With reference to Figure S, there is shown a more detailed illustrative block diayram of CATV channel authorization unit 100. Channel authorization unit loO
comprises a microprocessor 400 for performing data processing functionsl as will be described more fully below. ~icroprocessor 400, like microprocessor 200 may comprise any computing device, including all necessary, peripheral devices, for performing the data processing functions described herein.
Microprocessor 400 is in data communication with an infrared receiver 402 for receiving infrared data transmissions from data transmitter 108. IR receiver 402 may also be adapted to receive Infrared transmissions from a user transmitter 110 (Figure 1~ as described herein. IR receiver 402 may comprise any device known in the art for rec~iving infrared data transmissions. Alternatively, receiver 402 may comprise apparatus for receiving data in accordance with the chosen method of transmission. Also, should two 30 transmitters 108 and 110 be employed, receiver 402 may be adapted to receive data in two formats, e.g., at differing carrier frequencies, for distinguishing between transmitters as discussed above.
A typical block diagram for IR Receiver 402 is shown in Figure 6~. A photo diode 500, being sensitive to infrared light, provides a low level signal to a high gain amplifier 502. A limiter 504 is used in conjunction with amplifier 502 to provide a controlled signal level to a bandpass filter 506. The characteristics of bandpass filter 506 are chosen such : ~
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~l.3~4'~5 that only a signal in the frequency band used for the infrared carrier frequency may pass to a demodulator 508. When a signal passes through bandpass filter 506, demodulator 508 provides charge to integrator 510.
Integrator 510 accumulates this charge providing a voltage to comparator 512. If the signal is present for sufficient time, the voltage at the input of comparator 512 will rise to a level that triggers its digital output to change state. Thus the on/off modulation of the infrared carrier signal is demodulated and provided as baseband data to microprocessor 400 where software or other circuitry decodes the data into either data from the user transmitter or the programmer transmitter.
Microprocessor 400 is also in data communication with a channel discriminator ~04 via an interface 406.
Channel discriminator 404 is adapted to receive each of the plurality of CATV system stations from CATV
transmitter 102 and to provide the selected channels to user television terminal 104 (Figure 1), in responsa to channel authorization data received from microprocessor 400 via interface 406. Channel discriminator 404 and interface 406 may comprise conventional devices for : performing the aforedescribed functions, as is known in the art.
As shown in Figure 6B, discriminator 404 typically contains a voltage controlled oscillator (VC0) 514. A
mixer 516 is coupled to VC0 514 and is also coupled to receive the plurality of CATV system channels from CATV
transmitter 102 (Figure 1). The frequency of , ::' ~ ''' .
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VCO Sl4 is selected by a control signal received from interface 406 such that when the output of VCO 514 is mixed with the incoming RF spectrum from CATV tran~smitter 102, the desired channel is translated to a predetermined intermediate frequency (IF). The IF
signal is filtered, via filter 518, to remove any unwanted image fre-quencies that may have been introduced in the mixing process.
After filtering~ the IF signal is translated to the appropriate fre-quency necessary for the interface to user television terminal 104 (Figure l) by mixing the IF signal with the output of another ~scillator 520 in mixer 522. In this manner, the scrambled plurality of system channels received from CATV transmitter 102 is descrambled to the IF signal by VCO 514 and mixer 516 in response to control signaLs received from interface 406. The IF signal is then filtered and adapted for use by user television terminal lOg.
To provide the appropriate con~rol to VCO 514 from data received from microprocessor 400, interface 406 contains a phase locked loop circuit that is used to accurately control the frequency of VCO 514. This is accomplished by taking a portion of the output of YCO 514 (see Figure 6B) and9 by use of a frequency divider circuit 524 (Figure 5C), creating a sample frequency that is an inte-gral sub-multiple of the VCO frequency. The divisor used by the divider circuit is furnished to interface 405 by microprocessor 400 and is chosen such that the resulting sample frequency is equal to a reference frequency as determined by a crystal controlled reference oscillator 526. A phase detector 528 is used to compare the phase of the sample and reference frequencies. Its output i then integrated by integrator 530 to provide the control signal that is used to correct the frequency of VCO 514.
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Hence, in order to enable a user to receive a selected channel, micropro~essor 400 first determines whether the channel the user requesting to be provided is authorized. If so, appropriate divisor data is provided to interface 406. This data is used to control the output of VCO 514 to allow proper descrambling of the CATV transmitter signal. Other variations and implementations of this technique are well known in the art.
Microprocessor 400 is also in data communication with memory 408. Memory 408 is provided for storing channel authorization and system program data. Hence, memory 408, like memory 212 (Figure 2), may comprise random access memory, read only memory and/or programmable read only memory for performing this function. Also, microprocessor 400 may be in data communication with a user channel selector fo7 receiving a channel selection signal which is indicative of a particular channel which the user is requesting to be provided.
In operation, microprocessor 400 receives channel authorization data from a system programmer via data entry terminal 106, data transmitter 108 and IR receiver 404. Microprocessor 400 records this in~ormation in memory 408. When a user attempts to access a channel, microprocessor 400 first determines whether the channel being accessed is authorized by consulting memory 408 and, if so, allows the user to receive this channel via ; channel discriminator 404. Alternatively, should the user attempt to access a channel which is not ; authorized, then microprocessor 400 will provide an alternate channel, known as a barker channel, to the user via channel discriminator 404.
To authorize receipt o~ a selected channel, micro-processor 400 provides channel authorization data, whichdata .
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.
corresponds to the channel being requestecl, to interface 406.
Interface 406 receives a sample frequency from discriminator 404 and combines the sample with the authorization data from micro-processor 400 to provide a control signal to discriminator 404.
Discriminator 404 responds to the control data to properly descramble the signal received from the CATV transmitter and pro-vide the requested channel to the user television terminal.
It will be appreciated by those skilled in the art that the sys-tem described above can be used for programming the CATV autho-rization unit with data in addition to channel authorization data. As an example, this system can be used to provide parental guidance channel data such that a parent, guardian or other supervising adult can determine which of the selected channels children within the household will be unable to receive. In this regard, the above-described system can also be used for supplying the parental authorization code which enables the parentl guardian or supervising adult to access the parental guidance channels. Thus, the system programmer can program not only those channels which are pro-tected by parental guidance channel status but also can program the system with parental guidance authorization codes.
In a further embodimentl CATV channel authorization unit 100 is also responsive to a user transmitter 110 (Figure 1) for alter-ing the selected channel which the user is presently viewing. In such an embodimentl IR receiver 402 (Figure 4) is adapted to provide microprocessor ~00 with data received from both data transmitter 108 and user transmitter 110. Each transmission is provided by mod-ulating the duration of an infrared digital transmission signall as described hereinabove by reference to Figure 2. However, the .
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nature of information being transmitted is distinguished by the for-mat of the data transmission.
In the preferred embodiment, data is transmitted in packets having a header pulse of a specified duration, a five bit custom code, a six bit data word, the complement of the custom code and the complement of the data word. The six bit data word actually con-tains four bits of hexadecimal information data and two bits OI
descriptive data. The two bit descriptive data is used to determine whether the four bit information data comprises an address of mem-ory 408, a channel to be stored in an address of memory 408, control and error checking information to initiate the storage procedure or data to be retrieved from memory 408 and provided to the user via channel discriminator 404. User transmitter 110 is only enabled to transmit descriptive data in one format (that bein~ the format which instructs mlcroprocessor 400 to alter the ~annel being viewed) and, hence, is unable to program memory 408 with addition-al selected,channels. Conversely, data transmitter 108 is able to transmit under any format and, therefore, is able to perform any function.
While only several presently preferred embodiments of the foregoing novel method and apparatus have b~en described in detail herein, many modifications and variations thereof will readily become apparent to those skilled in the art. It is our intention, by the following claims, to embody all such modifications and variations as fall within the true scope and spirit of our invention.
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Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Programming apparatus for remotely programming a cable television channel authorization unit of a cable television terminal with channel authorization data, the channel authorization unit of the cable television terminal operable for selecting one channel from a predetermined configuration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system and responsive to user control via a space data communications link to the terminal, the programming apparatus comprising:
data entry means for producing the predetermined configuration representing said channels authorization data, the data entry means being responsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data via the space data communication link to the terminal and first data processing means having associated first memory means responsive to said data entry means for producing the channel configuration authorization data, said data processing means encoding the produced channel configuration data for transmission by the transmission means to a receiver means of the terminal; and the receiver means of the terminal for receiving the channel configuration authorization data; said receiver comprising:
second data processing means having associated second memory means, the data processing means responsive to the channel configuration authorization data received at said receiver means for updating the channel authorization data recorded in said second memory means, the cable television channel authorization unit responsive to the data processing means providing a user with access to those channels prescribed by the recorded channel authorization data.
data entry means for producing the predetermined configuration representing said channels authorization data, the data entry means being responsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data via the space data communication link to the terminal and first data processing means having associated first memory means responsive to said data entry means for producing the channel configuration authorization data, said data processing means encoding the produced channel configuration data for transmission by the transmission means to a receiver means of the terminal; and the receiver means of the terminal for receiving the channel configuration authorization data; said receiver comprising:
second data processing means having associated second memory means, the data processing means responsive to the channel configuration authorization data received at said receiver means for updating the channel authorization data recorded in said second memory means, the cable television channel authorization unit responsive to the data processing means providing a user with access to those channels prescribed by the recorded channel authorization data.
2. Apparatus a recited in Claim 1 wherein said data entry means further comprises means for interfacing a cable television programmer with said first data processing means, the cable television programmer providing the appropriate channel configuration authorization data therethrough the receiving data entry means status data therefrom.
3. Programming apparatus for remotely programming a cable television channel authorization unit of a cable television terminal, the channel authorization unit operable for selecting one channel from a predetermined configuration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system responsive to user control via a space data communication link to the terminal, the programming apparatus comprising:
data storage means;
data entry means for producing channel authorization, channel configuration, channel selection and control data from a cable television programmer;
data processing means responsive to said data entry means for storing a plurality of combination of channel configuration data in said data storage means wherein each combination represents a configuration of authorized channels, said data processing means being responsive to control data signals received from said data entry means for encoding one of the plurality of stored combinations for transmission to said cable television channel authorization unit via the space data communication link, said data processing means being further responsive to control signals received from said data entry means for transmitting channel authorization data produced by said data entry means in a first format an the channel selection in a second format to said cable television channel authorization unit via the space data communication link.
data storage means;
data entry means for producing channel authorization, channel configuration, channel selection and control data from a cable television programmer;
data processing means responsive to said data entry means for storing a plurality of combination of channel configuration data in said data storage means wherein each combination represents a configuration of authorized channels, said data processing means being responsive to control data signals received from said data entry means for encoding one of the plurality of stored combinations for transmission to said cable television channel authorization unit via the space data communication link, said data processing means being further responsive to control signals received from said data entry means for transmitting channel authorization data produced by said data entry means in a first format an the channel selection in a second format to said cable television channel authorization unit via the space data communication link.
4. Apparatus as recited in Claim 3 wherein said data processing means further comprises:
transmission means for transmitting data to the cable television channel authorization unit via the space data communication link;
means for providing a carrier signal of a predetermined frequency; and means for modulating the carrier signal with the channel authorization, configuration, selection and control data to be transmitted to the cable television channel authorization unit, said modulation means being coupled to said transmission means for transmitting the modulated channel authorization, configuration, selection and control data to the cable television channel authorization unit.
transmission means for transmitting data to the cable television channel authorization unit via the space data communication link;
means for providing a carrier signal of a predetermined frequency; and means for modulating the carrier signal with the channel authorization, configuration, selection and control data to be transmitted to the cable television channel authorization unit, said modulation means being coupled to said transmission means for transmitting the modulated channel authorization, configuration, selection and control data to the cable television channel authorization unit.
5. Programming apparatus for remotely programming a cable television channel authorization unit of a cable television terminal over a first space data communications link, the channel authorization unit including a receiver operable for receiving data indicating one channel from a configuration of authorized scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system, said data being transmitted in a first format from a user via a second space data communication link to the receiver, said programming apparatus comprising:
data entry means for producing channel configuration authorization data from a system programmer and for transmitting the channel configuration data to said receiver in a second format via the first space data communications link;
the data entry means comprising:
means for transmitting data in the first format to the receiver of the cable television channel authorization unit;
first data processing means having associated first memory means responsive to the channel configuration authorization data from the system programmer for encoding the channel configuration authorization data in the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal of a predetermined frequency; and means for modulating the encoded data in the second format with the carrier signal to be transmitted to the cable television channel authorization unit, and the cable television authorization unit comprising a second data processing means coupled to said receiver and responsive to data received in the second format for preventing the user of the cable television channel authorization unit from receiving unauthorized channels, said second data processing means being responsive to data received in the first format for changing the channel which the user is presently viewing.
data entry means for producing channel configuration authorization data from a system programmer and for transmitting the channel configuration data to said receiver in a second format via the first space data communications link;
the data entry means comprising:
means for transmitting data in the first format to the receiver of the cable television channel authorization unit;
first data processing means having associated first memory means responsive to the channel configuration authorization data from the system programmer for encoding the channel configuration authorization data in the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal of a predetermined frequency; and means for modulating the encoded data in the second format with the carrier signal to be transmitted to the cable television channel authorization unit, and the cable television authorization unit comprising a second data processing means coupled to said receiver and responsive to data received in the second format for preventing the user of the cable television channel authorization unit from receiving unauthorized channels, said second data processing means being responsive to data received in the first format for changing the channel which the user is presently viewing.
6. Apparatus as recited in Claim 5 wherein said data entry means comprises:
means for transmitting data in the first format to the receiver of the cable television channel authorization unit;
first data processing means for receiving the channel configuration authorization data from a system programmer and for encoding the channel configuration authorization data in the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal of a predetermined frequency; and means for modulating the encoded data in the second format with the carrier signal to be transmitted to the cable television channel authorization unit.
means for transmitting data in the first format to the receiver of the cable television channel authorization unit;
first data processing means for receiving the channel configuration authorization data from a system programmer and for encoding the channel configuration authorization data in the second format to be transmitted to the cable television channel authorization unit;
means for supplying a carrier signal of a predetermined frequency; and means for modulating the encoded data in the second format with the carrier signal to be transmitted to the cable television channel authorization unit.
7. Apparatus for providing user with a particular authorized configuration of selected cable television system channels from among a plurality of scrambled or unscrambled cable television system channels comprising:
a cable television terminal comprising:
channel authorization means for descrambling the authorized plurality of scrambled cable television system channels, said channel authorization means being coupled to a user's television terminal and providing the authorized configuration from the plurality of selected cable television channels thereto;
means for receiving channel configuration authorization data in a first format via a space data communication link, said receiving means being coupled to said channel authorization means for providing channel authorization data received over the space data communication link to said authorization means; and remote programming apparatus comprising:
data entry means for producing channel configuration authorization data, said data entry means being adapted to transmit the channel configuration authorization in the first format to said data receive means via the space data communications link, said channel authorization means being responsive to the channel configuration authorization data for enabling the descrambling of scrambled channels of the authorized configuration of cable television system channels to be supplied to the user's television terminal, cable television channel selection data being transmitted in a second format, via the space data communications link.
a cable television terminal comprising:
channel authorization means for descrambling the authorized plurality of scrambled cable television system channels, said channel authorization means being coupled to a user's television terminal and providing the authorized configuration from the plurality of selected cable television channels thereto;
means for receiving channel configuration authorization data in a first format via a space data communication link, said receiving means being coupled to said channel authorization means for providing channel authorization data received over the space data communication link to said authorization means; and remote programming apparatus comprising:
data entry means for producing channel configuration authorization data, said data entry means being adapted to transmit the channel configuration authorization in the first format to said data receive means via the space data communications link, said channel authorization means being responsive to the channel configuration authorization data for enabling the descrambling of scrambled channels of the authorized configuration of cable television system channels to be supplied to the user's television terminal, cable television channel selection data being transmitted in a second format, via the space data communications link.
8. Apparatus as recited in Claim 7 wherein said data entry means of the remote programming apparatus comprises first transmit means for transmitting channel authorization data to said receiving means, said apparatus further comprising second transmit means for transmitting the cable television channel selection data to said receiving means, said first and second transmit means being adapted to transmit data in the first and second formats, respectively, said channel authorization means being responsive to data received in said first format for updating the configuration of selected cable television channels which the user is enabled to receive and said channel authorization means being responsive to data received in said second format for changing the channel displayed.
9. Apparatus as recited in Claim 8 wherein said first format comprises data selected from a first group and wherein said second format comprises data selected from a second group such that said first and second transmit means are adapted to transmit data from the first and second groups, respectively.
10. Apparatus as recited in Claim 7 wherein said channel authorization means further comprises:
discriminator means for receiving the plurality of scrambled cable television system channels transmitted from a cable television transmitter, said discriminator means being responsive to a control signal for descrambling a predetermined one of the selected scrambled channels to be provided to the user's television terminal;
channel selection means for receiving a channel selection data signal from a user;
memory means for storing channel configuration authorization data;
means for processing data, said data processing means being coupled to said first receiving means for receiving channel configuration authorization data therefrom, said data processing means being further coupled to said memory means for storing channel configuration authorization data received from said first receiving means, said data processing means being responsive to the channel selection data signal for determining whether the selected channel is authorized and, if so, providing a control signal corresponding to the selected channel to said discriminator means and, if not, providing a control signal corresponding to an alternate channel to said discriminator means.
discriminator means for receiving the plurality of scrambled cable television system channels transmitted from a cable television transmitter, said discriminator means being responsive to a control signal for descrambling a predetermined one of the selected scrambled channels to be provided to the user's television terminal;
channel selection means for receiving a channel selection data signal from a user;
memory means for storing channel configuration authorization data;
means for processing data, said data processing means being coupled to said first receiving means for receiving channel configuration authorization data therefrom, said data processing means being further coupled to said memory means for storing channel configuration authorization data received from said first receiving means, said data processing means being responsive to the channel selection data signal for determining whether the selected channel is authorized and, if so, providing a control signal corresponding to the selected channel to said discriminator means and, if not, providing a control signal corresponding to an alternate channel to said discriminator means.
11. Apparatus as recited in Claim 10 wherein said data entry means comprises first transmit means for transmitting channel configuration authorization data to said first receiving means, and wherein said channel selection means comprises second transmit means for transmitting cable television channel selection data to said first receiving means, said first and second transmit means being adapted to transmit data in first and second formats, respectively, said channel authorization means being responsive to data received in said first format for changing the particular configuration of selected channels which the user is enabled to receive and said channel authorization means being responsive to data received in said second format for changing the channel which is being provided to the user.
12. A method for programming a cable television channel authorization unit of a cable television terminal from remote control programming apparatus over a first space data communications link comprising the steps of:
(a) providing channel configuration data which specifies which ones of a plurality of scrambled or unscrambled cable television system channels a user is authorized to receive;
(b) translating the provided channel configuration data into channel authorization data for transmission in a first format over the first space data communications link;
(c) transmitting the channel authorization data in the first format to the cable television channel authorization unit via the first space data communication link;
(d) receiving the channel authorization data and storing the channel authorization data with associated data as to the scrambled or unscrambled character of the authorized channel;
(e) responding to the stored channel authorization data to enable the user to receive only those scrambled or unscrambled cable television system channels specified by the channel authorization data; and (f) responding to user channel selection data for selecting a scrambled channel by descrambling the selected scrambled channel only if the selected channel is authorized, the channel selection data being transmitted in a second format over a second space data communication link.
(a) providing channel configuration data which specifies which ones of a plurality of scrambled or unscrambled cable television system channels a user is authorized to receive;
(b) translating the provided channel configuration data into channel authorization data for transmission in a first format over the first space data communications link;
(c) transmitting the channel authorization data in the first format to the cable television channel authorization unit via the first space data communication link;
(d) receiving the channel authorization data and storing the channel authorization data with associated data as to the scrambled or unscrambled character of the authorized channel;
(e) responding to the stored channel authorization data to enable the user to receive only those scrambled or unscrambled cable television system channels specified by the channel authorization data; and (f) responding to user channel selection data for selecting a scrambled channel by descrambling the selected scrambled channel only if the selected channel is authorized, the channel selection data being transmitted in a second format over a second space data communication link.
13. Programming apparatus for remotely, programming a cable television channel authorization unit of a cable television terminal with channel authorization data and feature data, the channel authorization unit of the cable television terminal operable responsive to user control for selecting one channel from a predetermined configuration of authorization scrambled or unscrambled channels of a plurality of cable television channels transmitted to the terminal over a cable transmission system for display, the programming apparatus comprising:
data entry means for producing the predetermined configuration representing said channel authorization data and the feature data, the data entry means being responsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data and the feature data via an infra-red data communications link to the cable television terminal; and data processing means having associated memory means, the data processing means responsive to said data entry means for producing the channel configuration authorization data and the feature data, the data processing means encoding the produced channel configuration authorization data and the feature data into a first format for transmission by the transmission means, the first format being a different format from a second format for data for selecting a channel to be displayed, an infra-red data receiver of the cable television terminal operable to receive data in either the first or the second format.
data entry means for producing the predetermined configuration representing said channel authorization data and the feature data, the data entry means being responsive to programmer control;
transmission means responsive to said data entry means for transmitting the channel authorization configuration data and the feature data via an infra-red data communications link to the cable television terminal; and data processing means having associated memory means, the data processing means responsive to said data entry means for producing the channel configuration authorization data and the feature data, the data processing means encoding the produced channel configuration authorization data and the feature data into a first format for transmission by the transmission means, the first format being a different format from a second format for data for selecting a channel to be displayed, an infra-red data receiver of the cable television terminal operable to receive data in either the first or the second format.
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| US06/897,878 US4792972A (en) | 1986-08-19 | 1986-08-19 | Remote programming of CATV channel authorization unit |
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| US4482947A (en) * | 1982-04-12 | 1984-11-13 | Zenith Electronics Corporation | Multi-function, multi-unit remote control system and method therefor |
| US4510623A (en) * | 1982-07-23 | 1985-04-09 | General Electric Company | Television channel lockout |
| US4495654A (en) * | 1983-03-29 | 1985-01-22 | Rca Corporation | Remote controlled receiver with provisions for automatically programming a channel skip list |
| US4558464A (en) * | 1983-06-10 | 1985-12-10 | General Instrument Corporation | Address-programmable CATV converter |
| US4527194A (en) * | 1983-07-27 | 1985-07-02 | Zenith Electronics Corporation | Channel assignment for CATV system |
| US4574305A (en) * | 1983-08-11 | 1986-03-04 | Tocum, Incorporated | Remote hub television and security systems |
| US4530008A (en) * | 1983-10-03 | 1985-07-16 | Broadband Technologies, Inc. | Secured communications system |
| ZA862839B (en) * | 1985-05-24 | 1986-12-30 | Scientific Atlanta | Method and apparatus for scrambling and descrambling television signals |
-
1986
- 1986-08-19 US US06/897,878 patent/US4792972A/en not_active Expired - Fee Related
-
1987
- 1987-08-12 JP JP62504841A patent/JP2714384B2/en not_active Expired - Lifetime
- 1987-08-12 AU AU77874/87A patent/AU600017B2/en not_active Ceased
- 1987-08-12 WO PCT/US1987/001912 patent/WO1988001465A1/en not_active Application Discontinuation
- 1987-08-12 EP EP87905399A patent/EP0321476A1/en not_active Withdrawn
- 1987-08-18 CA CA000544792A patent/CA1304495C/en not_active Expired - Lifetime
-
1988
- 1988-04-18 DK DK209988A patent/DK209988D0/en not_active Application Discontinuation
-
1989
- 1989-02-17 FI FI890799A patent/FI890799A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI890799A0 (en) | 1989-02-17 |
| WO1988001465A1 (en) | 1988-02-25 |
| AU600017B2 (en) | 1990-08-02 |
| JP2714384B2 (en) | 1998-02-16 |
| AU7787487A (en) | 1988-03-08 |
| DK209988D0 (en) | 1988-04-18 |
| US4792972A (en) | 1988-12-20 |
| FI890799A (en) | 1989-02-17 |
| EP0321476A1 (en) | 1989-06-28 |
| JPH02501343A (en) | 1990-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 19980630 |