CN2549674Y - Monitor for cable TV network against copy right encroachment - Google Patents
Monitor for cable TV network against copy right encroachment Download PDFInfo
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- CN2549674Y CN2549674Y CN02218049U CN02218049U CN2549674Y CN 2549674 Y CN2549674 Y CN 2549674Y CN 02218049 U CN02218049 U CN 02218049U CN 02218049 U CN02218049 U CN 02218049U CN 2549674 Y CN2549674 Y CN 2549674Y
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Abstract
Disclosed is a monitoring device for cable TV network against copy right encroachment, including a monitoring mainframe and a plurality of line monitors, wherein, the monitoring mainframe is arranged on a frond-terminal machine room of the cable TV station, and the line monitors are arranged in cable TV network equipments and lines. The mainframe continuously generates and transmits encoded digital control signals to various line monitors blending with TV program signals, and the signals are transmitted to families of the users through the monitors. The monitors receive continuously the control orders from the control mainframe, if one control order is incorrect, the monitor automatically starts up a scrambling circuit to conduct full scrambling against the illegal TV signals and automatically cut off the working power supply of a power supplier and a magnifier, so as to protect the stricken line and network of the user, prevent the illegal TV signals from transmitting to the user terminals and avoid the user from being interfered by the illegal TV programs.
Description
Technical field
The utility model relates to a kind of audiovisual/visual information transmission equipment, relates in particular to a kind of anti embezzling play back on cable TV network supervising device.
Background technology
At present, cable TV has spread to huge numbers of families, how to guarantee that everybody can both watch normal and healthy TV programme, is related to the stable and people's of country vital interests.Some illegal organizations utilize the advanced person's that some tissue provides TV to intercut equipment, utilize the defective that the cable TV network overlay area is wide, circuit is long, the user is numerous and be difficult to effectively manage, in the cable TV network in minority area, take to interrupt cable television program, insert the TV playing device, the illegal TV programme of bootlegging broadcasting, send the regional cable TV subscriber who is interrupted normal program by force to and illegally propagate, disturb and destroy.Thereby press for a kind of facility that can effectively carry out illegal-broadcast preventing to existing cable television network system.To prevent and to stop the generation of this type of incident.
Summary of the invention
The purpose of this utility model is to provide a kind of cable TV illegal-broadcast preventing supervising device that can discern and prevent the illegal programs broadcast, to stop the interference of illegal programs to normal program.
The purpose of this utility model is achieved in that this anti embezzling play back on cable TV network supervising device comprises that one is arranged on monitoring host computer and some line monitors that is arranged in Wired TV network equipment and the circuit of cable TV station's headend room,
Described monitoring host computer is made up of cipher controlled single-chip microcomputer, presetting circuit, modulation circuit, filtering amplification matching circuit and power supply circuit, and the output of cipher controlled single-chip microcomputer connects the input of presetting circuit; The output of presetting circuit connects the input of modulation circuit; The output of modulation circuit connects the input of filtering amplification matching circuit; The output of filtering amplification matching circuit connects the default front end blender of cable TV station, and power supply circuit is electrically connected with cipher controlled single-chip microcomputer, modulation circuit and filtering amplification matching circuit.
Described line monitor amplifies demodulation shaping circuit, encoded control single-chip microcomputer, radiofrequency signal control circuit and working power circuit by control signal split circuit, filtering and forms, the input of control signal split circuit connects cable TV network signal input line road, output connects the input that the demodulation shaping circuit is amplified in filtering, and another output connects an input of radiofrequency signal control circuit; The input of the output connection encoded control single-chip microcomputer of demodulation shaping circuit is amplified in filtering; The output of encoded control single-chip microcomputer connects another input of radiofrequency signal control circuit; The output of radiofrequency signal control circuit connects cable TV network output line road; Working power circuit amplifies demodulation shaping circuit, encoded control single-chip microcomputer and radiofrequency signal control circuit with control signal split circuit, filtering and is electrically connected.
In described line monitor, also be provided with a built-in flow channels, the demodulation shaping circuit is amplified in described filtering and the radiofrequency signal control circuit is electrically connected with working power circuit by built-in flow channels.
Described Wired TV network equipment is charger, amplifier, addressable controller, addressable line concentration type controller.
The control signal of described cipher controlled single-chip microcomputer adopts pilot carrier frequency to transmit, the scrambled digital signal of generation by the 6th pin interrupted transmission of the integrated circuit (IC) in the cipher controlled single-chip microcomputer 1 to presetting circuit.
Described presetting circuit is made up of resistance R 8, R9, R10, adjustable resistance RP1, electrochemical capacitor DJ1 and capacitor C 18, and wherein R8, R9, RP1 form amplitude limiter circuit, and the digital signal of input is carried out amplitude limiting processing; DJ1, C18 form block isolating circuit, and the digital signal of input is carried out being transferred to modulation circuit by R10 at last every straight processing.
Integrated circuit (IC) 2 in the described modulation circuit is phase-locked loop circuit (PLL), integrated circuit (IC) 3 is a pre-divider, integrated circuit (IC) 4 is a voltage controlled oscillator, diode VD1 is a varactor, be combined into a digital phase-locked loop modulation circuit, adopt the mode modulation transmissions of frequency shift keying (FSK), the control signal after the modulation is transferred to capacitor C 8 in the filtering amplification matching circuit by the 3rd pin of integrated circuit (IC) 4.
Described filtering amplification matching circuit is formed amplifying circuit by capacitor C 8, C9, C10, inductance L 11, resistance R 3, R4 and triode VT1, form filter circuit by inductance L 2-L10 and capacitor C 10-C14, C25, C26, by attenuator S1, resistance R 5, R6, R7 and capacitor C 15, C16, C17 form match circuit; Control signal after amplifying circuit amplifies is introduced filter circuit by the capacitor C in the amplifying circuit 10; Introduce match circuit through the filtered control signal of filter circuit by the capacitor C in the filter circuit 14; Control signal after the match circuit coupling inserts cable TV network by the capacitor C in the match circuit 17.
Described filtering is amplified the demodulation shaping circuit and is constituted filter amplification circuit by capacitor C 5, C10, C11, resistance R 4, R5, R6, triode VT1 and inductance L 4, constitutes shaping circuit by resistance R 9, R10 and capacitor C 19, and integrated circuit (IC) 1 is a demodulation chip; Control signal after filter amplification circuit filtering is amplified is introduced IC1 by the 16th pin of integrated circuit (IC) 1, after being demodulated to restituted signal, exports demodulation chip by the 9th pin of IC1, restituted signal is sent into the 12nd pin of IC1 after the shaping circuit shaping, behind the built-in comparison circuit of IC1,, transfer to the 6th pin of encoded control single-chip microcomputer integrated circuit (IC) 2 by the final digital signal of the 14th pin output of IC1.
Described encoded control single-chip microcomputer is deciphered, is checked the digital signal that receives, as receive correct, then controlling the radiofrequency signal control circuit normally passes through by signal, as receive incorrect, then control the radiofrequency signal control circuit and this road signal is carried out the dark width of cloth upset and warn, thereby reach the purpose of control.
Described radiofrequency signal control circuit mainly is made up of automatically controlled attenuation diode VD3, VD4, capacitor C 7, C9, C22, C23, resistance R 11 and diode VD1, VD2, automatically controlled attenuation diode VD3 is by the 7th foot control system of integrated circuit (IC) 2, automatically controlled attenuation diode VD4 is by the 10th foot control system of integrated circuit (IC) 2, when IC2 receives correct signal, the 10th pin output high level conducting VD4 of IC2, the 7th pin output low level allows radiofrequency signal normally pass through by VD3; When IC2 received incorrect signal, the 7th pin and the 10th pin of IC2 were exported the on off state that multiple square wave is controlled VD3, VD4 respectively, radiofrequency signal is carried out the dark width of cloth upset.
Because the utility model has adopted above technical scheme, a monitoring host computer and some line monitors in cable TV network, have been increased, the uninterrupted sending controling instruction of monitoring host computer and and TV programme signal mixing be sent to all kinds of line monitors that are installed in the cable TV network, be transferred to huge numbers of families through watch-dog again.The uninterrupted control command that receives from monitoring host computer of watch-dog; correctly then control command and TV programme signal are normally let pass together as control command; interrupt or incorrect or when inserting the TV programme of broadcasting midway and not having the control command of monitoring host computer as control command; then start scrambling circuit automatically to the full scrambling of illegal TV signal or cut off the working power of charger, amplifier automatically; thereby circuit and user network that protection is damaged; make the unlikely huge numbers of families of being transferred to of illegal TV signal, stop the interference of illegal programs the user.
Description of drawings
Use principle of the present utility model and circuit diagram are further provided by following examples and accompanying drawing thereof, and wherein, accompanying drawing is:
Fig. 1 is the application schematic diagram of the utility model anti embezzling play back on cable TV network supervising device;
Fig. 2 is the functional-block diagram of the utility model monitoring host computer;
Fig. 3 is the functional-block diagram of the utility model line monitor;
Fig. 4 is the circuit diagram of the utility model monitoring host computer;
Fig. 5 is the circuit diagram of the utility model line monitor.
Embodiment
Referring to Fig. 1, Fig. 1 is the application schematic diagram of the utility model anti embezzling play back on cable TV network supervising device, monitoring host computer of the present utility model is installed in cable TV station's headend room, the control signal that monitoring host computer sends and cable TV signal are transferred to the cable TV transmission network network after the front end blender of TV station mixes.Line monitor is installed in needs the position monitored in each main line of cable TV transmission network network and the branch line, for example each amplifier delivery outlet, each responsible consumer distributing point etc.Monitoring host computer uninterruptedly sends the control key signal at front end, and line monitor uninterruptedly receives the control key signal on the line.When the signal that receives is correct, allow this signal and TV signal normally pass through together; When the signal that receives is incorrect, then this road radiofrequency signal is carried out the dark width of cloth upset of all-channel and warn, to reach the purpose of monitoring.
Referring to Fig. 2, monitoring host computer of the present utility model is made up of cipher controlled single-chip microcomputer, presetting circuit, modulation circuit, filtering amplification matching circuit and power supply circuit (end illustrates among the figure), and uninterrupted generation of cipher controlled single-chip microcomputer and transmission control key signal are sent into presetting circuit; The control signal that presetting circuit produces the cipher controlled single-chip microcomputer is carried out pressure regulation, is transferred to modulation circuit after processing such as straight, amplitude limit; Modulation circuit is modulated to control signal on the pilot tone by the FSK mode; The filtering amplification matching circuit carries out sending into after filtering, amplification, the coupling the default front end blender of cable TV station to pilot signal and enters cable TV network after TV signal is mixed.Power supply circuit is electrically connected with cipher controlled single chip circuit, modulation circuit and filter amplification circuit, provides power supply to each circuit.
Referring to Fig. 3, line monitor of the present utility model amplifies demodulation shaping circuit, encoded control single-chip microcomputer, radiofrequency signal control circuit and working power circuit (among the figure also end illustrate) by control signal split circuit, filtering and forms.The input of control signal split circuit connects the mixed signal incoming line after the cable TV network amplifier amplifies.From mixed signal, isolate pilot signal transmission and handle, simultaneously TV signal is transferred to the radiofrequency signal control circuit to filter amplification circuit.Filtering is amplified the demodulation shaping circuit and the pilot signal that receives is carried out filtering and is amplified, and its shaping is reduced to digital signal after demodulating control signal.Decipher, verification by the digital signal of coming to transmitting for the encoded control single-chip microcomputer, as receive correctly, sends normal signal to the radiofrequency signal control circuit, the TV programme normal transmission; As receive incorrect or do not have control signal, then send multiple rectangle scrambling ripple to the radiofrequency signal control circuit.The radiofrequency signal control circuit then allows this road signal normally pass through as receiving the normal signal that the encoded control single-chip microcomputer sends; As receive scrambled signals, then this road radiofrequency signal is made the dark width of cloth of all-channel and upset processing by multiple rectangle scrambling ripple.Mixed signal after the radiofrequency signal control circuit is handled outputs in the cable TV network circuit.Working power circuit amplifies demodulation shaping circuit, encoded control single-chip microcomputer and radiofrequency signal control circuit with control signal split circuit, filtering and is electrically connected, and provides working power to each circuit.
Referring to Fig. 4, Fig. 4 is the circuit diagram of the utility model monitoring host computer.Shown in the figure, A1 is the cipher controlled single chip circuit, and A2 is a presetting circuit, and A3 is a modulation circuit, and A4 is the filtering amplification matching circuit.The scrambled digital signal that the cipher controlled single-chip microcomputer of circuit A1 produces is by the 6th pin interrupted transmission of integrated circuit (IC) 1 resistance R 8 in the circuit A2.Circuit A2 is made up of resistance R 8, R9, R10, adjustable resistance RP1, electrochemical capacitor DJ1 and capacitor C 18, and wherein R8, R9, RP1 form amplitude limiter circuit, and the digital signal of input is carried out amplitude limiting processing; DJ1, C18 form block isolating circuit, and the digital signal of input is carried out being transferred to circuit A3 by R10 at last every straight processing.Integrated circuit (IC) 2 among the circuit A3 is for being phase-locked loop circuit (PLL), and integrated circuit (IC) 3 is a pre-divider,
Integrated circuit (IC) 4 (please be indicated implication for voltage controlled oscillator! ), diode VD1 is a varactor, is combined into a digital phase-locked loop modulation circuit, adopts the mode modulation transmissions of frequency shift keying (FSK), the control signal after the modulation is transferred to capacitor C 8 in the A4 circuit by the 3rd pin of integrated circuit (IC) 4.Circuit A4 forms amplifying circuit by capacitor C 8, C9, C10, inductance L 11, resistance R 3, R4 and triode VT1; Form filter circuit by inductance L 2-L10 and capacitor C 10-C14, C25, C26, form match circuit by attenuator S1, resistance R 5, R6, R7 and capacitor C 15, C16, C17; Control signal after amplifying circuit amplifies is introduced filter circuit by the capacitor C in the amplifying circuit 10; Introduce match circuit through the filtered control signal of filter circuit by the capacitor C in the filter circuit 14; Control signal after the match circuit coupling finally inserts cable TV network by the capacitor C in the match circuit 17 through the port one A of cable TV Building F (PORT1A).
Referring to Fig. 5, Fig. 5 is the circuit diagram of the utility model line monitor.Shown in the figure, B1 is that control signal split circuit, B2 are that the demodulation shaping circuit is amplified in filtering, and B3 is that decoding control circuit, B4 are the radiofrequency signal control circuit, and B5 is a power circuit, and B6 is built-in interchange 60V flow channels.Mixed signal is input to control signal split circuit B1 through capacitor C 1, and main path signal is transferred to the capacitor C 9 among the radiofrequency signal control circuit B4, and tributary signal is transferred to the capacitor C 5 among the filtering amplification demodulation shaping circuit B2.Circuit B2 constitutes filter amplification circuit by capacitor C 5, C10, C11, resistance R 4, R5, R6, triode VT1 and inductance L 4; Constitute shaping circuit by resistance R 9, R10 and capacitor C 19; Integrated circuit (IC) 1 is a demodulation chip; Control signal after filter amplification circuit filtering is amplified is introduced IC1 by the 16th pin of integrated circuit (IC) 1, after being demodulated to restituted signal, exports demodulation chip by the 9th pin of IC1, restituted signal is sent into the 12nd pin of IC1 after the shaping circuit shaping, behind the built-in comparison circuit of IC1,, transfer to the 6th pin of encoded control single-chip microcomputer integrated circuit (IC) 2 by the final digital signal of the 14th pin output of IC1.Encoded control single chip circuit B3 deciphers, checks the digital signal that receives, as receives correctly, then controls radiofrequency signal control circuit B4 and allows signal normally pass through; As receive incorrectly, then control radiofrequency signal control circuit B4 and this road signal is carried out the dark width of cloth upset and warn, thereby reach the purpose of control.Radiofrequency signal control circuit B4 mainly is made up of automatically controlled attenuation diode VD3, VD4, capacitor C 7, C9, C22, C23, resistance R 11 and diode VD1, VD2; Automatically controlled attenuation diode VD3 is by the 7th foot control system of integrated circuit (IC) 2, and automatically controlled attenuation diode VD4 is by the 10th foot control system of integrated circuit (IC) 2, the VD3 parallel connection in the line, VD4 connects in the line.When IC2 receives correct signal, the 10th pin of IC2 output high level conducting VD4, the 7th pin output low level is by VD3, and radiofrequency signal just can normally be passed through like this; When IC2 received incorrect signal, the 7th pin and the 10th pin of IC2 were exported the on off state that multiple square wave is controlled VD3, VD4 respectively, radiofrequency signal is carried out the dark width of cloth upset.Owing to adopt B4 sort circuit structure, when IC2 received correct signal, normally by not damaged, when IC2 received incorrect signal, circuit B4 was big to the upset degree of radiofrequency signal, controlled effective for radiofrequency signal.The input voltage of power circuit B5 can be and exchanges 60V or alternating current 220V, provides working power with direct current 5V to each circuit.
Claims (10)
1, a kind of anti embezzling play back on cable TV network supervising device is characterized in that: comprise that one is arranged on monitoring host computer and some line monitors that is arranged in Wired TV network equipment and the circuit of cable TV station's headend room;
Described monitoring host computer is made up of cipher controlled single-chip microcomputer, presetting circuit, modulation circuit, filtering amplification matching circuit and power supply circuit, and the output of cipher controlled single-chip microcomputer connects the input of presetting circuit; The output of presetting circuit connects the input of modulation circuit; The output of modulation circuit connects the input of filtering amplification matching circuit; The output of filtering amplification matching circuit connects the default front end blender of cable TV station, and power supply circuit is electrically connected with cipher controlled single-chip microcomputer, modulation circuit and filtering amplification matching circuit.
Described line monitor amplifies demodulation shaping circuit, encoded control single-chip microcomputer, radiofrequency signal control circuit and working power circuit by control signal split circuit, filtering and forms, the input of control signal split circuit connects cable TV network signal input line road, output connects the input that the demodulation shaping circuit is amplified in filtering, and another output connects an input of radiofrequency signal control circuit; The input of the output connection encoded control single-chip microcomputer of demodulation shaping circuit is amplified in filtering; The output of encoded control single-chip microcomputer connects another input of radiofrequency signal control circuit; The output of radiofrequency signal control circuit connects cable TV network output line road; Working power circuit amplifies demodulation shaping circuit, encoded control single-chip microcomputer and radiofrequency signal control circuit with control signal split circuit, filtering and is electrically connected.
2, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: in described line monitor, also be provided with a built-in flow channels, the demodulation shaping circuit is amplified in described filtering and the radiofrequency signal control circuit is electrically connected with working power circuit by built-in flow channels.
3, anti embezzling play back on cable TV network supervising device according to claim 1 is characterized in that: described Wired TV network equipment is charger, amplifier, addressable controller, addressable line concentration type controller.
4, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: the control signal of described cipher controlled single-chip microcomputer adopts pilot carrier frequency to transmit, the scrambled digital signal of generation by the 6th pin interrupted transmission of the integrated circuit (IC) in the cipher controlled single-chip microcomputer 1 to presetting circuit.
5, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: described presetting circuit is made up of resistance R 8, R9, R10, adjustable resistance RP1, electrochemical capacitor DJ1 and capacitor C 18, wherein R8, R9, RP1 form amplitude limiter circuit, and the digital signal of input is carried out amplitude limiting processing; DJ1, C18 form block isolating circuit, and the digital signal of input is carried out being transferred to modulation circuit by R10 at last every straight processing.
6, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: the integrated circuit (IC) 2 in the described modulation circuit is phase-locked loop circuit (PLL), integrated circuit (IC) 3 is a pre-divider, integrated circuit (IC) 4 is a voltage controlled oscillator, diode VD1 is a varactor, be combined into a digital phase-locked loop modulation circuit, adopt the mode modulation transmissions of frequency shift keying (FSK), the control signal after the modulation is transferred to capacitor C 8 in the filtering amplification matching circuit by the 3rd pin of integrated circuit (IC) 4.
7, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: described filtering amplification matching circuit is formed amplifying circuit by capacitor C 8, C9, C10, inductance L 11, resistance R 3, R4 and triode VT1, form filter circuit by inductance L 2-L10 and capacitor C 10-C14, C25, C26, by attenuator S1, resistance R 5, R6, R7 and capacitor C 15, C16, C17 form match circuit; Control signal after amplifying circuit amplifies is introduced filter circuit by the capacitor C in the amplifying circuit 10; Introduce match circuit through the filtered control signal of filter circuit by the capacitor C in the filter circuit 14; Control signal after the match circuit coupling inserts cable TV network by the capacitor C in the match circuit 17.
8, anti embezzling play back on cable TV network supervising device according to claim 3, it is characterized in that: described filtering is amplified the demodulation shaping circuit and is constituted filter amplification circuit by capacitor C 5, C10, C11, resistance R 4, R5, R6, triode VT1 and inductance L 4, constitute shaping circuit by resistance R 9, R10 and capacitor C 19, integrated circuit (IC) 1 is a demodulation chip; Control signal after filter amplification circuit filtering is amplified is introduced IC1 by the 16th pin of integrated circuit (IC) 1, after being demodulated to restituted signal, exports demodulation chip by the 9th pin of IC1, restituted signal is sent into the 12nd pin of IC1 after the shaping circuit shaping, behind the built-in comparison circuit of IC1,, transfer to the 6th pin of encoded control single-chip microcomputer integrated circuit (IC) 2 by the final digital signal of the 14th pin output of IC1.
9, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: described encoded control single-chip microcomputer is deciphered, is checked the digital signal that receives, as receive correct, then controlling the radiofrequency signal control circuit normally passes through by signal, as receive incorrect, then control the radiofrequency signal control circuit and this road signal is carried out the dark width of cloth upset and warn, thereby reach the purpose of control.
10, anti embezzling play back on cable TV network supervising device according to claim 1, it is characterized in that: described radiofrequency signal control circuit mainly is made up of automatically controlled attenuation diode VD3, VD4, capacitor C 7, C9, C22, C23, resistance R 11 and diode VD1, VD2, automatically controlled attenuation diode VD3 is by the 7th foot control system of integrated circuit (IC) 2, automatically controlled attenuation diode VD4 is by the 10th foot control system of integrated circuit (IC) 2, when IC2 receives correct signal, the 10th pin output high level conducting VD4 of IC2, the 7th pin output low level allows radiofrequency signal normally pass through by VD3; When IC2 received incorrect signal, the 7th pin and the 10th pin of IC2 were exported the on off state that multiple square wave is controlled VD3, VD4 respectively, radiofrequency signal is carried out the dark width of cloth upset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02218049U CN2549674Y (en) | 2002-06-10 | 2002-06-10 | Monitor for cable TV network against copy right encroachment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02218049U CN2549674Y (en) | 2002-06-10 | 2002-06-10 | Monitor for cable TV network against copy right encroachment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2549674Y true CN2549674Y (en) | 2003-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02218049U Expired - Fee Related CN2549674Y (en) | 2002-06-10 | 2002-06-10 | Monitor for cable TV network against copy right encroachment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2549674Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248831A (en) * | 2012-02-06 | 2013-08-14 | 张镇非 | Signal distributor of cable television system |
| CN103338390A (en) * | 2013-05-28 | 2013-10-02 | 武汉丰天信息网络有限公司 | Group adding descrambling charging system anti-piracy method |
| CN104850040A (en) * | 2015-04-17 | 2015-08-19 | 深圳市中明科技开发有限公司 | Electrostatic protection real-time monitoring alarm system |
-
2002
- 2002-06-10 CN CN02218049U patent/CN2549674Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248831A (en) * | 2012-02-06 | 2013-08-14 | 张镇非 | Signal distributor of cable television system |
| CN103338390A (en) * | 2013-05-28 | 2013-10-02 | 武汉丰天信息网络有限公司 | Group adding descrambling charging system anti-piracy method |
| CN103338390B (en) * | 2013-05-28 | 2016-11-02 | 武汉丰天信息网络有限公司 | One population adding descrambling charging system anti-piracy method |
| CN104850040A (en) * | 2015-04-17 | 2015-08-19 | 深圳市中明科技开发有限公司 | Electrostatic protection real-time monitoring alarm system |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |