CN103248831A - Signal distributor of cable television system - Google Patents
Signal distributor of cable television system Download PDFInfo
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- CN103248831A CN103248831A CN2012100250722A CN201210025072A CN103248831A CN 103248831 A CN103248831 A CN 103248831A CN 2012100250722 A CN2012100250722 A CN 2012100250722A CN 201210025072 A CN201210025072 A CN 201210025072A CN 103248831 A CN103248831 A CN 103248831A
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- signal
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Abstract
A signal distributor of a cable television system is used for receiving a down message and transmitting an up message back to a cable television system operator, and comprises an electricity signal separating unit, an electricity conversion unit, a signal mixed separation unit, an up ASK (amplitude shift keying) transmission unit, a control unit, a signal output control unit, a signal distribution unit, a pirated connection detecting unit and a down FSK (frequency shift keying) receiving unit, wherein the up ASK transmission unit is a system control end to transmit the up message generated by the control unit due to the fact that the pirated connection detecting unit detects an abnormity to the cable television system operator by an ASK mode through the signal mixed separation unit and the electricity signal separating unit, thereby realizing a monitoring function; and the down FSK receiving unit transmits the down message by an FSK mode. The signal distributor can improve the transmission efficiency and avoid the multiple-harmonic influence.
Description
Technical field
The present invention relates to a kind of signal distributor, especially mat amplitude shift modulation (Amplitude Shift Keying, ASK) mode transmit up message with the control transmission of access channel signal and mat frequency shifting modulation (Frequency Shift Keying, FSK) mode transmit descending message to system's control end to realize the monitoring of access channel signal.
Background technology
General cable television system to the mode that access channel signal transmits is: utilize Play System to produce the cable television channels signal; Be sent to the signal distributor through the main line distributor; By modulator-demodulator with the up message of system's control end through Play System and main line distributor and be sent to the signal distributor; And whether the signal distributor is sent to the client TV with the cable television channels signal according to up message with control.In addition, cable television system dealer is for obtaining the signal state of client TV, therefore utilize suitable mechanism and with the signal state of client TV through be back to system's control end of cable television system dealer to the signal distributor, can reach simultaneously whether by the illegal monitoring purposes that connects of stealing.
The signal distributor of prior art has the function that the control access channel signal transmits and channel state returns simultaneously, and generally be to carry out in the FSK mode, and because the multiple harmonic that produces in the transmission course is difficult for complete filtering, can have influence on specific channel picture when making the channel state passback.In addition, the part that the signal distributor often uses PIN diode to switch as access channel signal, and the effect of cutting off has only 30DB approximately, so can't cover signal fully, make the cable TV signal of client TV be interfered, causing the client end TV to demonstrate the picture of noise snowflake, more is serious when especially the frequency of access channel signal is more high.
Therefore, need a kind ofly transmit up message in the ASK mode and reach the signal distributor that transmits the cable television system of descending message in the FSK mode, to solve above-mentioned prior art problems.
Summary of the invention
Main purpose of the present invention is providing a kind of signal distributor of cable television system, be in order to receive descending message and up message is back to the cable television system dealer, comprise electric power signal separative element, power conversion unit, signal hybrid separation unit, up ASK delivery unit, control unit, the signal output control unit, signal distributing unit, the robber connects and detects unit and descending FSK receiving element, wherein up ASK delivery unit is with up message that control unit was produced in the ASK mode, through signal hybrid separation unit and electric power signal separative element and be sent to system's control end of cable television system dealer, use the realization monitoring function, and descending FSK receiving element is to transmit descending message in the FSK mode.
Whether robber of the present invention connects and detects the unit is to be cut off or to steal in order to the cable of cable TV that detects client to connect, use to produce to steal to connect and detect signal, can be in order to reach monitoring function, and control unit can receive to steal connect detect the unit detect signal the time further produce closure message and give the signal output control unit, be not sent to the client TV in order to close video signal, stop to transmit video signal immediately to the client TV to reach.
Therefore, but the present invention's mat ASK mode transmits up message, and mat FSK mode transmits descending message simultaneously, and utilizes the high-frequency synthetic technology to produce required low frequency carrier signal, make output signal not have the problem of multiple harmonic, thereby can not disturb in progress cable television program.In addition, utilize switch chip to cut off access channel signal, can improve the covering access channel signal and reach 54DB, and can not produce the snowflake picture.
Description of drawings
Fig. 1 is the schematic diagram of the signal distributor of cable television system of the present invention.
Fig. 2 is the exemplary circuit diagram of part of the present invention unit.
Fig. 3 is the exemplary circuit diagram of up ASK delivery unit.
Fig. 4 is the exemplary circuit diagram of control unit.
Fig. 5 is the exemplary circuit diagram of signal distributing unit.
Fig. 6 is the exemplary circuit diagram of signal output control unit.
Fig. 7 is the exemplary circuit diagram of descending FSK receiving element.
Embodiment
Those skilled in the art below cooperate embodiments of the present invention done more detailed description, so that can implement after studying this specification carefully according to this.
With reference to figure 1, the schematic diagram of the signal distributor of cable television system of the present invention.As shown in Figure 1, the signal distributor of cable television system of the present invention comprises that electric power signal separative element 10, power conversion unit 20, signal hybrid separation unit 30, up amplitude shift modulation (ASK) delivery unit 40, control unit 50, signal output control unit 60, signal distributing unit 70, robber connect and detect unit 80 and downstream frequency displacement modulation (FSK) receiving element 90, the cable television channels signal that transmits in order to the system's control end (not shown) that receives the cable television system dealer, and further be sent to client TV LTV.
The electric power signal separative element 10 of the present invention online signal S1 that the cable TV cable is online is separated into input power supply Vin and cable television channels signal, and further online signal S1 is copied into the signal S3 of subordinate and is sent to the signal distributor (not shown) of next stage.
Signal hybrid separation unit 30 connects the cable television channels signal, and the cable television channels signal is carried out descending signal and the video signal that separating treatment is comprised to capture wherein, and sends out, and wherein descending signal is to transmit in the FSK mode.
The output control message that the video signal that the signal distributing unit 70 that receives signal output control unit 60 transmits and control unit 50 transmit, and according to exporting the control message to determine whether video signal is sent to client TV LTV, views and admires so that the user to be provided.
The robber connects and detects the video signal that unit 80 detects client TV LTV, and when the video signal of client TV LTV is cut off, being cut off to carry out illegal malice such as cable steals when connecing, can produce and detect signal, and be sent to control unit 50, further produce up message by control unit 50.
Up ASK delivery unit 40 receives the up message that control unit 50 produces, and produce up signal in the ASK mode, and be sent to signal hybrid separation unit 30, and then be back to system's control end through electric power signal separative element 10, to realize monitoring function.
In addition, control unit can receive to steal connect detect unit 80 detect signal the time further produce closure message and give signal output control unit 60, be not sent to client TV LTV in order to close video signal, stop to transmit video signal immediately to client TV LTV to reach.
Fig. 2 to Fig. 7 is respectively the exemplary circuit diagram of each unit of the present invention, being noted that Fig. 2 to Fig. 7 is in order to the exemplary embodiment of feature of the present invention to be described, is not in order to limit scope of the present invention, therefore, the present invention comprises other circuit design of equity mutually.
With reference to figure 2, the schematic diagram of part of the present invention unit, comprise electric power signal separative element 10, power conversion unit 20, signal hybrid separation unit 30 and steal to connect and detect unit 80, wherein electric power signal separative element 10 and power conversion unit 20 are to be made of transformer T1, off-line type switch control chip U1, optical coupling assembly U2, a plurality of electric capacity, a plurality of inductance and a plurality of diode, use realization and will import the out-put supply Vout that power supply Vin converts direct current to, as the VCC1 among the figure, VCC2 and VCC3.Signal hybrid separation unit 30 and robber connect and detect unit 80 is to be made of transformer T2, transformer T3, three resistance R 2, R4, R6 and three resistance R 3, R5, R7, wherein utilize transformer T2 and resistance R 2, R4, R6 to isolate television signal TV, and use transformer T3 and resistance R 3, R5, R7 to connect signal TX and to produce signal RXD, and transformer T3 is used as to steal to connect and detects unit 80, and signal RXD is for detecting signal.
Off-line type switch control chip U1 can select the commercialization TNY280 chip of Power Integration company for use, and optical coupling assembly U2 can select the commercialization PC817 chip of company of Sharp (Sharp) for use.
With reference to figure 3, the exemplary circuit diagram of the up ASK delivery unit of the present invention, wherein up ASK delivery unit 40 comprises up ASK frequency control unit 42, up ASK data output unit 44 and up ASK frequency synthesis unit 46.
Up ASK frequency control unit 42 comprises a plurality of electric capacity, a plurality of resistance, a plurality of inductance, a plurality of transistor, a plurality of diode, crystal oscillator, phase-locked loop chip U3 and microcontroller chip U4, in order to produce high-frequency signals, wherein chip U3 in phase-locked loop can be the FS8170 chip that general sincere scientific ﹠ technical corporation peddles, and microcontroller chip U4 can be the PIC16F87 chip that Microchip Technology company peddles.Up ASK data output unit 44 comprises that a plurality of electric capacity, a plurality of resistance, a plurality of inductance, a plurality of transistor, transformer, surface acoustic wave (SAW) chip U5 and ASK transmit chip U6, wherein surface acoustic wave chip U5 can be the TC0219A chip that the good large scientific ﹠ technical corporation in Taiwan peddles, and ASK transmits chip U6 and can be the PT4450 chip that general sincere scientific ﹠ technical corporation peddles.Up ASK frequency synthesis unit 46 comprises a plurality of electric capacity, a plurality of resistance, a plurality of inductance, transistor, two transformers and two diodes, produces the ASK signal in order to carry out the ASK frequency synthesis to handle, and is used as this up signal.
With reference to figure 4, the exemplary circuit diagram of control unit of the present invention, wherein control unit 50 comprises a plurality of electric capacity, crystal oscillator and microprocessor chip U7, wherein microprocessor chip U7 can be commercial single chip microcontroller 89S52.
With reference to figure 5, the exemplary circuit diagram of signal distributing unit, wherein signal distributing unit 70 comprises a plurality of electric capacity, a plurality of resistance and a plurality of transformer, separates signal in order to cable TV signal TV is converted to eight cable TVs, such as the IN1～IN8 among the figure.
With reference to figure 6, the exemplary circuit diagram of signal output control unit of the present invention, wherein signal output control unit 60 comprises eight groups of output units, convert separation output signal OUT1～8 in order to cable TV is separated signal IN1～IN8, and each output unit is with respect to eight cable TVs separation signals one of them, and each output unit comprises a plurality of electric capacity, a plurality of resistance and cable TV switch chip U8, and cable TV switch chip U8 can be the MASWSS0067 chip that Cobham company peddles.
With reference to figure 7, the exemplary circuit diagram of the descending FSK receiving element of the present invention, wherein descending FSK receiving element 90 comprises a plurality of electric capacity, a plurality of resistance, a plurality of inductance, a plurality of transistor, crystal oscillator and FSK receiving chip U9, and wherein FSK receiving chip U9 can be the FSK receiving chip SI4330 that Silicon Labs company peddles.
Characteristics of the present invention are, but mat FSK mode is controlled wired electric signal of cable television system dealer and whether is sent to client and views and admires for the client, whether and simultaneously mat ASK mode is back to cable television system dealer's control centre with the state of the cable of cable TV line of client, be cut off or steal with monitoring cable of cable TV line to connect.
Another characteristics of the present invention are, utilize switch chip to cut off access channel signal, can improve the covering access channel signal and reach 54DB, and can not produce the snowflake picture, in addition, up message is used the ASK transmission, and utilizes the high-frequency synthetic technology to produce required low frequency carrier signal, make output signal not have the problem of multiple harmonic, thereby can not disturb in progress cable television program.
The above only is in order to explain preferred embodiment of the present invention, be not that attempt is done any pro forma restriction to the present invention according to this, therefore, all have in that identical invention spirit is following do relevant any modification of the present invention or change, all must be included in the category of claim of the present invention.
Claims (6)
1. the signal distributor of a cable television system, the signal distributor of this cable television system comprises:
One electric power signal separative element, link system's control end, the online signal that this system's control end is transmitted is separated into input power supply and a cable television channels signal, and further will this online signal is copied into subordinate's signal and is sent to the signal distributor of next stage;
One power conversion unit converts this input power supply to one out-put supply of appropriate voltage;
One signal hybrid separation unit, connect this cable television channels signal, and this cable television channels signal carried out a descending signal and the video signal that separating treatment is comprised to capture wherein, and send out, wherein this descending signal be with the frequency shifting modulation (Frequency Shift Keying, FSK) mode is transmitted;
One signal distributing unit receives this video signal, and is sent to a client TV;
One descending FSK receiving element receives this descending signal to produce a descending message;
One control unit receives this descending message and produces an output control message;
One signal output control unit receives the video signal that this signal distributing unit transmits, and the output control message that transmits of this control unit, and controls message to determine whether this video signal is sent to this client TV according to this output;
One robber connects and detects the unit, detects the video signal of this client TV, and when the video signal of this client TV is cut off, produces one and detect signal, and be sent to this control unit, produces a up message by this control unit;
One up ASK delivery unit, receive this up message, and produce a up signal, this up signal is with amplitude shift modulation (Amplitude Shift Keying, ASK) mode is sent to this signal hybrid separation unit, and further be back to this system's control end through this electric power signal separative element, to monitor.
2. signal distributor as claimed in claim 1, it is characterized in that, this control unit receive this robber connect detect the unit detect signal the time further produce a closure message and give this signal output control unit, be not sent to this client TV in order to close this video signal.
3. signal distributor as claimed in claim 1, it is characterized in that, this up ASK delivery unit comprises a up ASK frequency control unit, one up ASK data output unit and a up ASK frequency synthesis unit, this up ASK frequency control unit is in order to produce high-frequency signals, this up ASK data output unit is in order to the high-frequency signals that receives this up ASK frequency control unit and produces the ASK frenquency signal, this up ASK frequency synthesis unit is in order to utilize the ASK frenquency signal of this up ASK data output unit, and will convert an ASK signal from the up message of this control unit to, and be used as this up signal.
4. signal distributor as claimed in claim 3, it is characterized in that this up ASK frequency control unit comprises a plurality of electric capacity, a plurality of resistance, a plurality of inductance, a plurality of transistor, a plurality of diode, a crystal oscillator, a phase-locked loop chip and a microcontroller chip.
5. signal distributor as claimed in claim 3 is characterized in that, this up ASK data output unit comprises that a plurality of electric capacity, a plurality of resistance, a plurality of inductance, a plurality of transistor, transformer, a surface acoustic wave (SAW) chip and an ASK transmit chip.
6. signal distributor as claimed in claim 3 is characterized in that, this up ASK frequency synthesis unit comprises draws together a plurality of electric capacity, a plurality of resistance, a plurality of inductance, transistor, two transformers and two diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100250722A CN103248831A (en) | 2012-02-06 | 2012-02-06 | Signal distributor of cable television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100250722A CN103248831A (en) | 2012-02-06 | 2012-02-06 | Signal distributor of cable television system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103248831A true CN103248831A (en) | 2013-08-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100250722A Pending CN103248831A (en) | 2012-02-06 | 2012-02-06 | Signal distributor of cable television system |
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| CN (1) | CN103248831A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392732A (en) * | 2001-06-15 | 2003-01-22 | 张学斌 | Cable TV HFC network transmission link management system |
| CN2549674Y (en) * | 2002-06-10 | 2003-05-07 | 上海嘉宁电视器材有限公司 | Monitor for cable TV network against copy right encroachment |
| US20030121036A1 (en) * | 2001-12-03 | 2003-06-26 | Howard C. Lock | CATV messaging alert system |
| CN1447599A (en) * | 2002-03-21 | 2003-10-08 | 北京盈频数码科技有限责任公司 | Method for anti embezzling play back on cable TV network |
| CN2728125Y (en) * | 2004-08-10 | 2005-09-21 | 深圳市中科联创网络有限公司 | Cable TV transmission device |
| CN101500124A (en) * | 2008-02-01 | 2009-08-05 | 北京六合万通微电子技术股份有限公司 | Method for transmitting WLAN signal in wired television system and passive network bridge |
| CN101697598A (en) * | 2009-10-23 | 2010-04-21 | 河北理工大学 | Anti-intrusion device for cable television network and manufacturing method thereof |
| CN201577148U (en) * | 2009-06-24 | 2010-09-08 | 王晓庆 | Video, control data and power common cable transmission module |
| CN202798946U (en) * | 2012-02-06 | 2013-03-13 | 张镇非 | Signal distributor structure of cable television system |
-
2012
- 2012-02-06 CN CN2012100250722A patent/CN103248831A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392732A (en) * | 2001-06-15 | 2003-01-22 | 张学斌 | Cable TV HFC network transmission link management system |
| US20030121036A1 (en) * | 2001-12-03 | 2003-06-26 | Howard C. Lock | CATV messaging alert system |
| CN1447599A (en) * | 2002-03-21 | 2003-10-08 | 北京盈频数码科技有限责任公司 | Method for anti embezzling play back on cable TV network |
| CN2549674Y (en) * | 2002-06-10 | 2003-05-07 | 上海嘉宁电视器材有限公司 | Monitor for cable TV network against copy right encroachment |
| CN2728125Y (en) * | 2004-08-10 | 2005-09-21 | 深圳市中科联创网络有限公司 | Cable TV transmission device |
| CN101500124A (en) * | 2008-02-01 | 2009-08-05 | 北京六合万通微电子技术股份有限公司 | Method for transmitting WLAN signal in wired television system and passive network bridge |
| CN201577148U (en) * | 2009-06-24 | 2010-09-08 | 王晓庆 | Video, control data and power common cable transmission module |
| CN101697598A (en) * | 2009-10-23 | 2010-04-21 | 河北理工大学 | Anti-intrusion device for cable television network and manufacturing method thereof |
| CN202798946U (en) * | 2012-02-06 | 2013-03-13 | 张镇非 | Signal distributor structure of cable television system |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20161019 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |