CA1059665A - Receiver including a tuning circuit having a transmitter search device - Google Patents
Receiver including a tuning circuit having a transmitter search deviceInfo
- Publication number
- CA1059665A CA1059665A CA236,770A CA236770A CA1059665A CA 1059665 A CA1059665 A CA 1059665A CA 236770 A CA236770 A CA 236770A CA 1059665 A CA1059665 A CA 1059665A
- Authority
- CA
- Canada
- Prior art keywords
- group
- receiver
- transmitter
- memory
- search
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
- H03J5/0218—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, by selecting the corresponding analogue value between a set of preset values
- H03J5/0227—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, by selecting the corresponding analogue value between a set of preset values using a counter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/18—Automatic scanning over a band of frequencies
- H03J7/183—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength
Abstract
ABSTRACT
The use of group classification in a memory containing tuning data for a receiver and a scanning group selector giving a possibility of performing a selectable search per group of tuning data increases ease of operation.
The use of group classification in a memory containing tuning data for a receiver and a scanning group selector giving a possibility of performing a selectable search per group of tuning data increases ease of operation.
Description
~05961~5 The invention relates to a receiver which in-cludes a tuning circuit having a transmitter search device by means of which during a search a group from a plurality of tuning data stored in a memory can be scanned whilst the search can be stopped on tuning to a desired transmitter.
U.S. Patent 3,746,886 which issued on July 17, 1973 and U.S. Patent 3,8285205, a continuation-in-part of U.S. `
Patent 3,746,886 which issued on August 6, 1974 to Warwick Elect-ronics Inc. describes a receiver of the above-mentioned type which contains potentiometers which serve as memory elements for tuning data and part of which can if desired be scanned by means of a counter circuit. The potentiometers of the said scanned group serve consecutively to supply a tuning voltage to a tunable section of the receiver until the receiver is tuned to a desired transmitter.
The indication that the counter circuit, which in the relevant rec-eiver serves as a search device, has reached the desired transmit-ter is obtained by means of an indicating lamp which lights up when the corresponding tuning data are supplied to the tunable section.
It is an object of the present invention to pro-vide a receiver having a tuning circuit of greater ease of op-eration so that particularly vehic~e radio receivers equipped `
with such a tuning circuit demand very little attention for op-eration.
. ~ .
A receiver of the above-mentioned type accor-ding to the invention is characterized in that the memory contains a group classification for transmitter tuning data whilst the receiver has a scanning group selector by means of which a group from the group classification of transmitter tuning data to be scanned in a search can be selected, after which the search can be stopped by a reception condition
U.S. Patent 3,746,886 which issued on July 17, 1973 and U.S. Patent 3,8285205, a continuation-in-part of U.S. `
Patent 3,746,886 which issued on August 6, 1974 to Warwick Elect-ronics Inc. describes a receiver of the above-mentioned type which contains potentiometers which serve as memory elements for tuning data and part of which can if desired be scanned by means of a counter circuit. The potentiometers of the said scanned group serve consecutively to supply a tuning voltage to a tunable section of the receiver until the receiver is tuned to a desired transmitter.
The indication that the counter circuit, which in the relevant rec-eiver serves as a search device, has reached the desired transmit-ter is obtained by means of an indicating lamp which lights up when the corresponding tuning data are supplied to the tunable section.
It is an object of the present invention to pro-vide a receiver having a tuning circuit of greater ease of op-eration so that particularly vehic~e radio receivers equipped `
with such a tuning circuit demand very little attention for op-eration.
. ~ .
A receiver of the above-mentioned type accor-ding to the invention is characterized in that the memory contains a group classification for transmitter tuning data whilst the receiver has a scanning group selector by means of which a group from the group classification of transmitter tuning data to be scanned in a search can be selected, after which the search can be stopped by a reception condition
- 2 ~
'~ ~ - '' , ' ' ., ' .
P~IN.7771 ~6tS~36~S 30-6-1975 signal produced on reception of a desired transmitter of the selected group.
In particular for vehicle receivers this ls a very advantageous s-tepj becallse such receivers must often be tuned from one transmitter the range of which they leave to another transmitter.
When the group classification of the tuning data in the memory for example is such that transmitters which radiate the same programm belong to the same group, the listener may uninterrllptedly continue listening to this programme without operating any tnning member. The rece:iver then will each time automatically tune to a transmitter which provides sufficiently strong reception. Especially when a vehicle provided with such a receiver is driven in a large town StlC~ an arrangement is a great convenience, because under such conditions large field~strength variations occur which then need not influence the programme received.
Classification of tuning data in groups of transmitters according to geographical situation, such as for example groups of transmitters classified according to regions of traffic information broadcasts, may be of great convenience when driving in a country having such regions, because the receiver continues to be tuned to a transmItter from a given region, until the listener selects a group com-prising transmitters fron another region when ~e Icnows that he enters this other region.
- The said step can further be of advantage for other receivers if the latter are able to receive groups of transmitters which are classified, for example, according to the nature of the music which they generally radiate~
Embodiments-of the invention will now be described, by way of example, with reference to the accom-. - . , : : . :.
PHN.7771 ~ 9665 30-6-1975 panying diagr~mmatlc drawlngi, in which:
Figs. 1 and 2 are block schematic circuit diagrams of two embodiments of a receiver according to the invention.
.5 Referring now to Fig. 1, a signal supplied by an antenna is applied to an input 1 of a tuning section 3 of a receiver. The tuning section 3 can be tuned by means of a tuning voltage applied to an input 5 from an OUtpllt 7 of a transmitter tuning data section 9 of a memory 11. Thetrans-mitter tuning data section 9 of the memory 11 contains po-tentiometers 13, 14, 15, 16, 17 and 18 which each at one of the change-over terminals of a switch 19 supply a tuning - voltage which can be selected by.a pole of the switch 19 and supplied to the output 7.
The switch 19 can be.operated by a transmitter search device 21 if at an input 23 of this device a signal is applied which indicates that no transmitter is being ~eceived.
. The memory 11 further comprises a group mark section 25 having two switches 27 and 29 which are coupled to the switch 19 and are also ~ontrolled by the transmitter search device 21.
Two OUtplltS 31 and 33 coupled to the poles of the switches 29,.27 supply for each set of -transmitter tuning data selected by the switch 19 an associated group mark to . inputs 35, 37 respectlvely of an ident:ification circuit 39.
The group mark in this case is a voltage combination 00 in the first and the second positions of the switoh arms of the switches 19, 27 and 29,. a combination 01 in the third and the fourth.positions.an~ a comblnation 10 in the fifth and sixth positions. The tuning voltages of the potentiome~ers 13 and 1l~ belong to a.group 00, those of the lOS~6~5 potentiometers 15 and 16 to a group 01 and those oF the potentiometers 17 and 18 to a group 10.
By means of a scanning group selector 41, at outputs 43 and 45 of this selector a voltage combination is obtainable which can be ~-set by a switch 47 so that a group mark 00, 0l or 10 associated with a selected group is appl;ed to two inputs 49 and 51 of the identification circuit 39.
The identification circuit 39 at an output 53 produces an identification signal when the group mark selected by means of the switch 47 and applied to the inputs 49, 51 corresponds to the group mark at the inputs 35, 37 associated with the transmitter to which the receiver is tuned by means of the switch 19. This identification signal is applied to an input 55 of a gate circu;t 57.
When a transmitter of sufficient field strength is received, a reception condition signal is applied to a further input 59 of the gate circuit 57 from an output 61 of a detection circuit 63 which via an in-put 65 is coupled to an output 67 of the tuning section 3 of the receiver.
If both the reception condition signal and the identification `
signal appear at the input 59, 55 of the gate circuit 57, this circuit at an output 69 produces a stop signal which ;s applied to the input 23 of the transmitter search device 21 and causes it to stop when the rec-eiver is tuned to a transmitter from a group which is selected by the switch 47 and is received with sufficient strength. `
When the reception condition signal at the input 59 of the gate circuit 57 collapses, the search device starts another search which can only stop if within the group determined by the switch 47 a transmitter of sufficient field strength is found.
Obviously the transmitter tuning section 9 of` the memory 11 may be constructed so that a set of binary -- 5 ~
'~ i ~S9~5 tuning data is supplied to the tuning section 3. The latter then may comprise, for example, a frequency synthesis circuit.
The set of group mark data supplied by the group mark section 25 may if desired be, for example, a frequency or an analo-gous voltage. In this case the identification circuit 39 must be adapted thereto. The scanning group selector circuit 41 also may if desired by constructed so as to supply another type of group mark.
The switches 19, 27 and 29 in the memory 11 may in digita1 techniques take the form of shift registers, in which case the trans-mitter search device 21 may be a clock pulse generator.
In general a signal which depends upon the field strength of the received transmitter will be used as a reception condition signal. Each circuit commonly used for such a purpose can be used -in an appropriate manner.
In the embodiment described the number of groups to be -selected is three. Obviously, this number may be chosen at will.
If the transmitter is designed so that the group class-ification of the tuning data is effected according to the geo~
graphic situation of the transmitters in given regions, the switch 47 may preferably comprise a number of control members, for ex-ample push-buttons, which correspond to these regions and with i~
respect to their relative locations on a control panel are oriented , according to the geographic situation of the regions.
The scanning group selector circuit 41 may if desired have selection possibilities both according to type of programme and to geographical situation.
The group mark section of the memory, the scanning group selector circuit and the identification circuit can be greatly -;~, .~ , .:
~LOS96~5 simplified if the tuning data of a group are joined to a seq- -uence of positions of the switch 19. The switches 27 and 29 may then be replaced by one switch which each time at the beginning of scanning of a next group supplies a signal to the identification circuit 39 which by means of a counter can form an identification signal combination which can be compared with the output signal combination of the scanning group selector circuit 41. ' An even greater simplification of the circuit is obtainable if in the memory the tuning data are stored in groups which are adapted to be simultaneously scanned, as illustrated by the embodiment shown in Fig. 2.
In Fig. 2, in which corresponding component parts are designated by the same reference numerals as in Fig. 1, in the tuning data section 9 of the memory the poten-tiometers 13, 14 and 15 of a first group are connected to a switch 19 and the potentiometers 16, 17 and 18 of a seçond group are connected to a switch 20. The switches 19 and 20 are both coupled to the search device 21 and during a search simultaneously scan the two groups of tuning data supplied by the potentiometers. An output 7 connected to thè switch 19 and an output 8 connected to the switch 20 are connected to a scanning group selector switch 47 so that a set of tun-ing data fro~ a desired group can be selected and supplied to the tuning signal input 5~
Obviously the remarks made with respect to the embodiment shown in Fig. 1 apply to an embodiment as shown in Fig. 2 also.
~ ' ' .
.. . ,.:... .. . ;
'~ ~ - '' , ' ' ., ' .
P~IN.7771 ~6tS~36~S 30-6-1975 signal produced on reception of a desired transmitter of the selected group.
In particular for vehicle receivers this ls a very advantageous s-tepj becallse such receivers must often be tuned from one transmitter the range of which they leave to another transmitter.
When the group classification of the tuning data in the memory for example is such that transmitters which radiate the same programm belong to the same group, the listener may uninterrllptedly continue listening to this programme without operating any tnning member. The rece:iver then will each time automatically tune to a transmitter which provides sufficiently strong reception. Especially when a vehicle provided with such a receiver is driven in a large town StlC~ an arrangement is a great convenience, because under such conditions large field~strength variations occur which then need not influence the programme received.
Classification of tuning data in groups of transmitters according to geographical situation, such as for example groups of transmitters classified according to regions of traffic information broadcasts, may be of great convenience when driving in a country having such regions, because the receiver continues to be tuned to a transmItter from a given region, until the listener selects a group com-prising transmitters fron another region when ~e Icnows that he enters this other region.
- The said step can further be of advantage for other receivers if the latter are able to receive groups of transmitters which are classified, for example, according to the nature of the music which they generally radiate~
Embodiments-of the invention will now be described, by way of example, with reference to the accom-. - . , : : . :.
PHN.7771 ~ 9665 30-6-1975 panying diagr~mmatlc drawlngi, in which:
Figs. 1 and 2 are block schematic circuit diagrams of two embodiments of a receiver according to the invention.
.5 Referring now to Fig. 1, a signal supplied by an antenna is applied to an input 1 of a tuning section 3 of a receiver. The tuning section 3 can be tuned by means of a tuning voltage applied to an input 5 from an OUtpllt 7 of a transmitter tuning data section 9 of a memory 11. Thetrans-mitter tuning data section 9 of the memory 11 contains po-tentiometers 13, 14, 15, 16, 17 and 18 which each at one of the change-over terminals of a switch 19 supply a tuning - voltage which can be selected by.a pole of the switch 19 and supplied to the output 7.
The switch 19 can be.operated by a transmitter search device 21 if at an input 23 of this device a signal is applied which indicates that no transmitter is being ~eceived.
. The memory 11 further comprises a group mark section 25 having two switches 27 and 29 which are coupled to the switch 19 and are also ~ontrolled by the transmitter search device 21.
Two OUtplltS 31 and 33 coupled to the poles of the switches 29,.27 supply for each set of -transmitter tuning data selected by the switch 19 an associated group mark to . inputs 35, 37 respectlvely of an ident:ification circuit 39.
The group mark in this case is a voltage combination 00 in the first and the second positions of the switoh arms of the switches 19, 27 and 29,. a combination 01 in the third and the fourth.positions.an~ a comblnation 10 in the fifth and sixth positions. The tuning voltages of the potentiome~ers 13 and 1l~ belong to a.group 00, those of the lOS~6~5 potentiometers 15 and 16 to a group 01 and those oF the potentiometers 17 and 18 to a group 10.
By means of a scanning group selector 41, at outputs 43 and 45 of this selector a voltage combination is obtainable which can be ~-set by a switch 47 so that a group mark 00, 0l or 10 associated with a selected group is appl;ed to two inputs 49 and 51 of the identification circuit 39.
The identification circuit 39 at an output 53 produces an identification signal when the group mark selected by means of the switch 47 and applied to the inputs 49, 51 corresponds to the group mark at the inputs 35, 37 associated with the transmitter to which the receiver is tuned by means of the switch 19. This identification signal is applied to an input 55 of a gate circu;t 57.
When a transmitter of sufficient field strength is received, a reception condition signal is applied to a further input 59 of the gate circuit 57 from an output 61 of a detection circuit 63 which via an in-put 65 is coupled to an output 67 of the tuning section 3 of the receiver.
If both the reception condition signal and the identification `
signal appear at the input 59, 55 of the gate circuit 57, this circuit at an output 69 produces a stop signal which ;s applied to the input 23 of the transmitter search device 21 and causes it to stop when the rec-eiver is tuned to a transmitter from a group which is selected by the switch 47 and is received with sufficient strength. `
When the reception condition signal at the input 59 of the gate circuit 57 collapses, the search device starts another search which can only stop if within the group determined by the switch 47 a transmitter of sufficient field strength is found.
Obviously the transmitter tuning section 9 of` the memory 11 may be constructed so that a set of binary -- 5 ~
'~ i ~S9~5 tuning data is supplied to the tuning section 3. The latter then may comprise, for example, a frequency synthesis circuit.
The set of group mark data supplied by the group mark section 25 may if desired be, for example, a frequency or an analo-gous voltage. In this case the identification circuit 39 must be adapted thereto. The scanning group selector circuit 41 also may if desired by constructed so as to supply another type of group mark.
The switches 19, 27 and 29 in the memory 11 may in digita1 techniques take the form of shift registers, in which case the trans-mitter search device 21 may be a clock pulse generator.
In general a signal which depends upon the field strength of the received transmitter will be used as a reception condition signal. Each circuit commonly used for such a purpose can be used -in an appropriate manner.
In the embodiment described the number of groups to be -selected is three. Obviously, this number may be chosen at will.
If the transmitter is designed so that the group class-ification of the tuning data is effected according to the geo~
graphic situation of the transmitters in given regions, the switch 47 may preferably comprise a number of control members, for ex-ample push-buttons, which correspond to these regions and with i~
respect to their relative locations on a control panel are oriented , according to the geographic situation of the regions.
The scanning group selector circuit 41 may if desired have selection possibilities both according to type of programme and to geographical situation.
The group mark section of the memory, the scanning group selector circuit and the identification circuit can be greatly -;~, .~ , .:
~LOS96~5 simplified if the tuning data of a group are joined to a seq- -uence of positions of the switch 19. The switches 27 and 29 may then be replaced by one switch which each time at the beginning of scanning of a next group supplies a signal to the identification circuit 39 which by means of a counter can form an identification signal combination which can be compared with the output signal combination of the scanning group selector circuit 41. ' An even greater simplification of the circuit is obtainable if in the memory the tuning data are stored in groups which are adapted to be simultaneously scanned, as illustrated by the embodiment shown in Fig. 2.
In Fig. 2, in which corresponding component parts are designated by the same reference numerals as in Fig. 1, in the tuning data section 9 of the memory the poten-tiometers 13, 14 and 15 of a first group are connected to a switch 19 and the potentiometers 16, 17 and 18 of a seçond group are connected to a switch 20. The switches 19 and 20 are both coupled to the search device 21 and during a search simultaneously scan the two groups of tuning data supplied by the potentiometers. An output 7 connected to thè switch 19 and an output 8 connected to the switch 20 are connected to a scanning group selector switch 47 so that a set of tun-ing data fro~ a desired group can be selected and supplied to the tuning signal input 5~
Obviously the remarks made with respect to the embodiment shown in Fig. 1 apply to an embodiment as shown in Fig. 2 also.
~ ' ' .
.. . ,.:... .. . ;
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Receiver having a tuning circuit including a memory and a transmitter search device by means of which during a search a group from a plurality of tuning data stored in the memory can be scanned and the search stopped on tuning to a desired transmitter, characterized in that the memory con-tains a group classification for transmitter tuning data whilst A
the receiver has a scanning group selector by means of which a scanning group out of a number of scanning groups from the group classification of transmitter tuning data to be scanned in a search can be selected, after which the search can be stopped by a reception condition signal produced on reception of a desired transmitter of the selected group.
the receiver has a scanning group selector by means of which a scanning group out of a number of scanning groups from the group classification of transmitter tuning data to be scanned in a search can be selected, after which the search can be stopped by a reception condition signal produced on reception of a desired transmitter of the selected group.
2. Receiver as claimed in Claim 1, characterized in that the memory includes a group mark section which during a search can be scanned together with a transmitter tuning data section for the tuning data whilst the scanning group selector is coupled to an identification circuit to which the group mark section of the memory is also coupled and which is capable of delivering an identification signal when the group mark section of the memory satisfies a group mark determined by the scanning group selector, under the in-fluence of which indentification signal in conjunction with the reception condition signal the search can be stopped.
3. Receiver as claimed in Claim 1, characterized in that the memory contains a plurality of simultaneously scannable groups of tuning data, each group being associated with an output which via a group selection switch can be selected for delivering the tuning data of the desired group to be scanned.
4. Receiver as claimed in Claim 1, 2 or 3, charac-terized in that the receiver is a vehicle receiver and the scanning group selector is a programme-type selection circuit.
5. Receiver as claimed in Claim 1, characterized in that the receiver is a vehicle receiver and the scanning group selector is a geographical region selection circuit which permits a selection from groups of transmitters class-ified according to geographical situation.
6. Receiver as claimed in Claim 5, characterized in that the scanning group selector includes a control panel comprising group selection members arranged according to the geographical situations of the groups.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NLAANVRAGE7413161,A NL169008C (en) | 1974-10-07 | 1974-10-07 | RECEIVER CONTAINING A TUNING CIRCUIT WITH A TRANSMITTER. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059665A true CA1059665A (en) | 1979-07-31 |
Family
ID=19822225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA236,770A Expired CA1059665A (en) | 1974-10-07 | 1975-09-30 | Receiver including a tuning circuit having a transmitter search device |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4253194A (en) |
| JP (1) | JPS5344767B2 (en) |
| AU (1) | AU507229B2 (en) |
| CA (1) | CA1059665A (en) |
| DE (1) | DE2544511C3 (en) |
| FR (1) | FR2287825A1 (en) |
| GB (1) | GB1507684A (en) |
| HK (1) | HK41979A (en) |
| IT (1) | IT1047342B (en) |
| NL (1) | NL169008C (en) |
| SE (1) | SE412828B (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL176511C (en) * | 1979-01-17 | 1985-04-16 | Philips Nv | RECEIVER WITH A TRANSMITTER SWITCH. |
| US4270217A (en) * | 1979-04-30 | 1981-05-26 | Masco Corporation | Processor controlled, service selecting, AM/FM scanning radio receiver |
| US4409688A (en) * | 1979-04-30 | 1983-10-11 | Masco Corporation Of Indiana | Processor controlled, scanning radio receiver including future code developing means |
| NL8000509A (en) * | 1980-01-28 | 1981-08-17 | Philips Nv | RECEIVER WITH A TRANSMITTER SWITCH. |
| NL8003087A (en) * | 1980-05-29 | 1982-01-04 | Philips Nv | RECEIVER WITH A TRANSMITTER SWITCH. |
| US4347625A (en) * | 1980-06-16 | 1982-08-31 | General Electric Company | Arrangement for cellular operation of a repeater trunking system |
| US4414687A (en) * | 1980-08-04 | 1983-11-08 | Mitsubishi Denki Kabushiki Kaisha | Radio receiver |
| SE454227B (en) * | 1980-08-04 | 1988-04-11 | Mitsubishi Electric Corp | RADIORECEIVER |
| SE458976B (en) * | 1980-12-04 | 1989-05-22 | Mitsubishi Electric Corp | MORE STATION RECEIVER |
| US4380826A (en) * | 1980-12-09 | 1983-04-19 | Clarion Co., Ltd. | Control system for channel selection |
| JPS57101417A (en) * | 1980-12-16 | 1982-06-24 | Mitsubishi Electric Corp | Receiver |
| JPS5890684A (en) * | 1981-11-24 | 1983-05-30 | 株式会社デンソー | Navigator to be carried on vehicle |
| NL8202416A (en) * | 1982-06-15 | 1984-01-02 | Philips Nv | RECEIVER FOR FM SIGNALS WITH STORAGE STATUS CODE. |
| JPS5916480A (en) * | 1982-07-19 | 1984-01-27 | Sanyo Electric Co Ltd | Television receiver for character multiplex broadcast |
| USRE33157E (en) * | 1983-12-27 | 1990-01-30 | Motorola, Inc. | Null initiated method and system for monitoring a priority channel |
| US4573210A (en) * | 1983-12-27 | 1986-02-25 | Motorola, Inc. | Null initiated method and system for monitoring a priority channel |
| US5187470A (en) * | 1985-11-27 | 1993-02-16 | Seiko Corp. | Paging system with local channel lists |
| DE3616592A1 (en) * | 1986-05-16 | 1987-11-19 | Blaupunkt Werke Gmbh | METHOD AND CIRCUIT ARRANGEMENT FOR TUNING A CAR RADIO |
| US5732338A (en) * | 1987-07-27 | 1998-03-24 | Prs Corporation | Broadcast receiver capable of autonomous format-scanning, program identification and searching |
| US4969209A (en) * | 1987-07-27 | 1990-11-06 | Prs Corporation | Broadcast receiver capable of selecting stations based upon geographical location and program format |
| US4888815A (en) * | 1987-09-18 | 1989-12-19 | Uniden America Corporation | Scanning radio receiver |
| EP0477279B1 (en) * | 1989-06-16 | 1997-08-13 | Seiko Communications Holding N.V. | Paging system with local channel lists |
| DE4233282A1 (en) * | 1992-10-02 | 1994-04-07 | Becker Autoradio | Method of tuning a radio receiver using the RDS information |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3750030A (en) * | 1970-12-29 | 1973-07-31 | Gen Electric | Frequency switching circuitry for varactor tuned radio receivers |
| US3803494A (en) * | 1972-04-07 | 1974-04-09 | Bendix Corp | Pulse tuning control system for radio receivers |
| US3824475A (en) * | 1973-02-01 | 1974-07-16 | Tennelec | Scanning radio receiver |
| US3895303A (en) * | 1973-09-04 | 1975-07-15 | Gen Res Electronics Inc | Oscillator-actuated bandswitch |
| JPS5325721B2 (en) * | 1973-11-07 | 1978-07-28 | ||
| US3942121A (en) * | 1974-09-09 | 1976-03-02 | Texas Instruments Incorporated | Digital tuning method and system |
-
1974
- 1974-10-07 NL NLAANVRAGE7413161,A patent/NL169008C/en not_active IP Right Cessation
-
1975
- 1975-09-30 CA CA236,770A patent/CA1059665A/en not_active Expired
- 1975-10-03 IT IT69466/75A patent/IT1047342B/en active
- 1975-10-03 SE SE7511101A patent/SE412828B/en not_active IP Right Cessation
- 1975-10-03 GB GB40574/75A patent/GB1507684A/en not_active Expired
- 1975-10-04 DE DE2544511A patent/DE2544511C3/en not_active Expired
- 1975-10-06 FR FR7530502A patent/FR2287825A1/en active Granted
- 1975-10-07 JP JP12038875A patent/JPS5344767B2/ja not_active Expired
- 1975-10-07 AU AU85485/75A patent/AU507229B2/en not_active Expired
-
1979
- 1979-01-22 US US06/005,121 patent/US4253194A/en not_active Expired - Lifetime
- 1979-06-28 HK HK419/79A patent/HK41979A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE412828B (en) | 1980-03-17 |
| NL7413161A (en) | 1976-04-09 |
| IT1047342B (en) | 1980-09-10 |
| FR2287825A1 (en) | 1976-05-07 |
| HK41979A (en) | 1979-07-06 |
| GB1507684A (en) | 1978-04-19 |
| SE7511101L (en) | 1976-04-08 |
| DE2544511C3 (en) | 1980-06-26 |
| JPS5344767B2 (en) | 1978-12-01 |
| US4253194A (en) | 1981-02-24 |
| AU8548575A (en) | 1977-04-21 |
| NL169008B (en) | 1981-12-16 |
| FR2287825B1 (en) | 1981-02-06 |
| NL169008C (en) | 1982-05-17 |
| JPS5164311A (en) | 1976-06-03 |
| DE2544511B2 (en) | 1979-10-11 |
| DE2544511A1 (en) | 1976-04-15 |
| AU507229B2 (en) | 1980-02-07 |
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