CN101646110A - Signal reverse transmission system and method used for sharing-cable integrated services digital network - Google Patents
Signal reverse transmission system and method used for sharing-cable integrated services digital network Download PDFInfo
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Abstract
The invention provides a signal reverse transmission system and a method used for a sharing-cable integrated services digital network. The system comprises a reverse signal inserter used for reverselytransmitting a low frequency signal of a direct current level from a control end to a coaxial cable, at the same time, preventing a high frequency signal from the coaxial cable from feeding back to the control end, and preventing the low frequency signal from entering a sharing-cable integrated service digital network demodulator for demodulating the high frequency signal; a coaxial cable used for reversely transmitting the low frequency signal and forwards transmitting the high frequency signal; and a reverse signal reductor used for reading the low frequency signal from a low frequency channel of the coaxial cable to feed back to front-end equipment, at the same time, preventing the low frequency from entering the sharing-cable integrated service digital network modulator for modulatingthe high frequency signal, and allowing the high frequency to be forwards transmitted to the coaxial cable. The system and the method overcome the defects that the prior reverse transmission technology has a high error rate, and realize the reverse transmission effect with stable signal and low error rate in the sharing-cable integrated services digital network.
Description
Technical field
The present invention relates to common cable Integrated Service Digital Network, in particular to the signals reverse transmission system and the method that are used for common cable Integrated Service Digital Network.
Background technology
Cable Integrated Service Digital Network transmission technology comes from the cable TV technology altogether, has used a lot of years at monitoring trade.The cable Integrated Service Digital Network adopts 75 ohm coaxial cable usually altogether, and its bandwidth is 0-1GHz, and the vision signal of video camera output is 0-6MHz, and audio signal is 0-20KHz.The Voice ﹠ Video signal is modulated to 49.75MHz-860MHz with super band, and every 8MHz bandwidth can be modulated 1 road audio-video signal.Usually transmit 16 road audio-video signals, the product price ratio is the highest.What the audio frequency and video modulation signal took usually is the 49.75-860MHz hf channel, the high-frequency signal of different frequency range is mixed on the cable and transmit by splitter (on the cable TV with), the signal incoming terminal also will be distributed to each channel demodulation device through distributor.Splitter and distributor divide overcurrent splitter distributor and non-overcurrent splitter distributor usually in the cable TV technology.
Altogether in the cable Integrated Service Digital Network transmission technology, in the forward transmitted audio-video signal, also need reverse transfer to be used to control the control signal of monopod video camera etc. usually.Existing reverse transfer technology is that auxiliary signal RS485 signal is modulated on the 38MHz frequency, and the signal after will modulating then to front end, demodulates control signal at front end from the control end reverse transfer.It remains and utilizes modulation-demodulation technique, and just frequency range is on the 38MHz frequency.
The back-modulation demodulator is the communication control equipment in the common cable Integrated Service Digital Network supervisory control system, the major function of this equipment is that the RS485 control signal in the supervisory control system is modulated on the high frequency carrier of 38MHz through coded data, and the control data signal after will modulating is mixed in the coaxial cable of common cable Integrated Service Digital Network, will control the decoding demodulation of The Cloud Terrace camera lens at last and come out.Fig. 1 shows the workflow diagram according to the back-modulation demodulator of correlation technique.This back-modulation demodulator comprises reverse control modulator and oppositely controls demodulator that its workflow is as follows:
1, oppositely controls modulator and receive the RS485 control signal of control The Cloud Terrace, and demodulate the agreement control code by single-chip microcomputer;
2, the pulse signal of output and the high frequency carrier of 38MHz are carried out FSK (Frequency Shift Keying, frequency shift keying) modulation;
3, the 38MHz high-frequency carrier signal reverse transfer after the modulation is to front end;
4, the reverse control demodulator of front end demodulates pulse signal;
5, restore RS485 agreement control code through single-chip microcomputer again, be used for controlling monopod video camera.
In realizing process of the present invention, the inventor finds that the RS485 control signal adopts 38MHz high frequency modulated demodulation techniques in the above-mentioned technology, because will be with 38MHz high-frequency modulation signal reverse transfer to front end, because this transmission means is the same with head-end modulator, it will satisfy the anti-pass of 38MHz high-frequency modulation signal to different each modulator of transmission range, can both demodulate the reverse signal of high-quality RS485 to front end, debugging difficulty is very big, and high frequency audio vision signal mutual interference mutually easy and forward transmitted, and line loss is very big, causes the error rate higher.
Summary of the invention
The present invention aims to provide a kind of signals reverse transmission system and method that is used for common cable Integrated Service Digital Network, can solve existing reverse transfer technology error rate problem of higher.
In an embodiment of the present invention, a kind of signals reverse transmission system that is used for common cable Integrated Service Digital Network is provided, comprise: the reverse signal inserter, being used for will be from the low frequency signal reverse transfer of the DC level of control end to coaxial cable, stop high-frequency signal to feed back to control end simultaneously, stop low frequency signal to enter the common cable Integrated Service Digital Network demodulator that is used for the demodulation high-frequency signal from coaxial cable; Coaxial cable is used for reverse transfer low frequency signal and forward transmitted high-frequency signal; The reverse signal reductor is used for reading low frequency signal to feed back to headend equipment from the low channel of coaxial cable, stops low frequency signal to enter simultaneously and is used for the common cable Integrated Service Digital Network modulator of modulated high frequency signal, and allow the high-frequency signal forward transmitted to coaxial cable.
Preferably, the reverse signal inserter is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part, and capacitive part is used for stoping low frequency signal by high-frequency signal, enters common cable Integrated Service Digital Network demodulator to stop low frequency signal; Inductive part is used for stoping high-frequency signal by low frequency signal, with the low frequency signal reverse transfer to coaxial cable and stop high-frequency signal to feed back to control end.
Preferably, the reverse signal reductor is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part, capacitive part is used for stoping low frequency signal by high-frequency signal, allowing the high-frequency signal forward transmitted to coaxial cable, and stops low frequency signal to enter common cable Integrated Service Digital Network modulator; Inductive part is used for stoping high-frequency signal by low frequency signal, reads low frequency signal with the low channel from coaxial cable.
Preferably, low frequency signal comprises a plurality of reverse signals from a plurality of control ends, and the signals reverse transmission system also comprises: sub-control circuit during input is used for receiving a plurality of reverse signals with time division way from a plurality of control ends, and is transferred to the reverse signal inserter; Sub-control circuit during output is used for obtaining a plurality of reverse signals with the low frequency signal that time division way reads from the reverse signal reductor, and feeds back to the headend equipment that a plurality of control end is distinguished correspondence.
Preferably, sub-control circuit comprises during input: a plurality of relays are connected between a plurality of control ends and the reverse signal inserter; And controller, control the work of a plurality of relays with time division way.
Preferably, sub-control circuit comprises during output: a plurality of relays are connected between a plurality of headend equipments and the reverse signal reductor; And controller, control the work of a plurality of relays with time division way.
Preferably, a plurality of reverse signals comprise following at least a: RS485 signal, fire-fighting signal, telephone signal, broadcast singal.
Preferably, low frequency signal is 0～120V DC level, and bandwidth is 0-1MHz.
In an embodiment of the present invention, also provide a kind of signals reverse transmission method that is used for common cable Integrated Service Digital Network, may further comprise the steps: received low frequency signal from the DC level of control end; To coaxial cable, stop high-frequency signal to feed back to control end simultaneously the low frequency signal reverse transfer, stop low frequency signal to enter the common cable Integrated Service Digital Network demodulator that is used for the demodulation high-frequency signal from coaxial cable; Through coaxial cable reverse transfer low frequency signal, coaxial cable is the forward transmitted high-frequency signal also; Read low frequency signal to feed back to headend equipment from the low channel of coaxial cable, stop low frequency signal to enter simultaneously and be used for the common cable Integrated Service Digital Network modulator of modulated high frequency signal, and allow the high-frequency signal forward transmitted to coaxial cable.
Preferably, low frequency signal comprises a plurality of reverse signals from a plurality of control ends, and the low frequency signal that receives from control end specifically comprises: receive a plurality of reverse signals with time division way from a plurality of control ends; After reading low frequency signal, the low channel of coaxial cable specifically comprises: from the low frequency signal that reads, obtain a plurality of reverse signals with time division way; And a plurality of reverse signals are fed back to a plurality of control end distinguish corresponding headend equipment.
Preferably, a plurality of reverse signals comprise following at least a: RS485 signal, fire-fighting signal, telephone signal, broadcast singal.
Preferably, low frequency signal is 0～120V DC level, and bandwidth is 0-1MHz.
Above-mentioned signals reverse transmission system that is used for common cable Integrated Service Digital Network and method because with the low frequency signal reverse transfer to coaxial cable, and no longer adopt the FSK of 38MHz to modulate, so overcome existing reverse transfer technology error rate problem of higher, realized signal stabilization, the reverse transfer effect that the error rate is low in the cable Integrated Service Digital Network altogether.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the workflow diagram according to the back-modulation demodulator of correlation technique;
Fig. 2 shows the schematic diagram according to the signals reverse transmission system that is used for common cable Integrated Service Digital Network of the embodiment of the invention;
Fig. 3 shows the schematic diagram of sub-control circuit when importing according to the preferred embodiment of the invention;
Fig. 4 shows the schematic diagram of sub-control circuit when exporting according to the preferred embodiment of the invention;
Fig. 5 shows the flow chart according to the signals reverse transmission method that is used for common cable Integrated Service Digital Network of the embodiment of the invention;
Fig. 6 shows according to the preferred embodiment of the invention cable Integrated Service Digital Network safety monitoring system operation schematic diagram altogether.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 2 shows the schematic diagram according to the signals reverse transmission system that is used for common cable Integrated Service Digital Network of the embodiment of the invention, comprising:
In cable Integrated Service Digital Network system altogether, also comprise common cable Integrated Service Digital Network modulator 70 and cable Integrated Service Digital Network demodulator 60 altogether usually, be used to transmit audio-video signal, and be modulated on the high frequency carrier by coaxial cable 30 forward transmitted to control end from front end.This signals reverse transmission system because with the low frequency signal reverse transfer to coaxial cable, and no longer adopt the FSK of 38MHz to modulate, so avoided the interference between forward signal and the reverse signal, overcome existing reverse transfer technology error rate problem of higher, realized signal stabilization, the reverse transfer effect that the error rate is low in the cable Integrated Service Digital Network altogether.Mistake fluidic distributor 80 and overcurrent splitter 90 are the common devices at coaxial cable 30 two ends among the figure, can be used to insert multiple signals.
Preferably, the reverse signal inserter is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part, and capacitive part is used for stoping low frequency signal by high-frequency signal, enters common cable Integrated Service Digital Network demodulator to stop low frequency signal; Inductive part is used for stoping high-frequency signal by low frequency signal, with the low frequency signal reverse transfer to coaxial cable and stop high-frequency signal to feed back to control end.Preferably, the reverse signal reductor is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part, capacitive part is used for stoping low frequency signal by high-frequency signal, allowing the high-frequency signal forward transmitted to coaxial cable, and stops low frequency signal to enter common cable Integrated Service Digital Network modulator; Inductive part is used for stoping high-frequency signal by low frequency signal, reads low frequency signal with the low channel from coaxial cable.Usually inductance is to allow direct current signal to pass through, hinder AC signal, electric capacity is to allow AC signal to pass through, stop direct current signal to pass through, form simple circuit by the inductance capacitance device and realize the signal passive transmission that is coupled, transmission circuit allows DC level to pass through, and the low-frequency modulation signal that allows simultaneously will be superimposed upon on the DC level passes through.The circuit that the preferred embodiment is combined into by the inductance capacitance device, make this direct current and exchange letter and carry out special Coupling, in coaxial cable, transmit, can oppositely pass through overcurrent splitter and distributor, do not influence high frequency audio video modulation signal, modulator and demodulator simultaneously.Adopt passive inductance capacitance coupling technique, circuit is simple, and cost is low.
Preferably, reverse signal comprises a plurality of signals from a plurality of control ends, and the signals reverse transmission system also comprises:
Sub-control circuit 50 during output, are used for obtaining a plurality of reverse signals with the low frequency signal that time division way reads from reverse signal reductor 20, and feed back to the headend equipment that a plurality of control end is distinguished correspondence.
Adopted time division technique in the above preferred embodiment, thus can the reverse transfer multiple signals.
Preferably, sub-control circuit comprises during input: a plurality of relays are connected between a plurality of control ends and the reverse signal inserter; And controller, control the work of a plurality of relays with time division way; Sub-control circuit comprises during output: a plurality of relays are connected between a plurality of headend equipments and the reverse signal reductor; And controller, control the work of a plurality of relays with time division way.
Preferably, a plurality of signals comprise following at least a: RS485 signal, fire-fighting signal, telephone signal, broadcast singal.Preferably, low frequency signal is 0～120V DC level, and bandwidth is 0-1MHz.
RS485, rated power broadcast, fire-fighting bus, telephone signal can be transmitted by common paired cable, but not treated having on the transmission cable of rf modulated signal and can't transmitting, and especially transmit the 70-120V high voltage signal.And in the preferred embodiment, adopt that time division technique can be controlled RS485, fire-fighting 24V, telephone signal by computer software, single-chip microcomputer, broadcast singal divides different time to transmit in passage.
Prior art can only be transmitted single control signal.The preferred embodiment can be transmitted multiple signal: RS485, fire-fighting two bus 24V signals, 53V telephone signal, 70-120V broadcast singal etc.By time-division control technology (being different time transmission unlike signal), can make unit cable transmit roads up to a hundred signal, save a large amount of wire rods, labor hour, and increase the multiple function of system.
Fig. 3 shows the schematic diagram of sub-control circuit when importing according to the preferred embodiment of the invention, wherein with single chip machine controlling circuit according to the mode of cycle polling realize each relay (action of outside RS485 signal relay, rated power broadcast signal relay, RS485 signal relay, fire-fighting 24V signal relay, thus RS485 signal, 70-120V broadcasting, 24V fire-fighting signal etc. are gathered in time-division ground.Fig. 4 shows the schematic diagram of sub-control circuit when exporting according to the preferred embodiment of the invention, and system opens different signalling channels according to the terminal control system instruction when operation, make shared same transmission channel of multiple signal time-division.Principle and Fig. 3 are similar, repeat no more here.
Fig. 5 shows the flow chart according to the signals reverse transmission method that is used for common cable Integrated Service Digital Network of the embodiment of the invention, may further comprise the steps:
Step S10 receives the low frequency signal from the DC level of control end;
Step S20 to coaxial cable, stops the high-frequency signal from coaxial cable to feed back to control end the low frequency signal reverse transfer simultaneously, stops low frequency signal to enter the common cable Integrated Service Digital Network demodulator that is used for the demodulation high-frequency signal;
Step S30, through coaxial cable reverse transfer low frequency signal, coaxial cable is the forward transmitted high-frequency signal also;
Step S40 reads low frequency signal to feed back to headend equipment from the low channel of coaxial cable, stops low frequency signal to enter simultaneously and is used for the common cable Integrated Service Digital Network modulator of modulated high frequency signal, and allow the high-frequency signal forward transmitted to coaxial cable.
This signals reverse transmission method because with the low frequency signal reverse transfer to coaxial cable, and no longer adopt the FSK of 38MHz to modulate, so overcome existing reverse transfer technology error rate problem of higher, realized signal stabilization, the reverse transfer effect that the error rate is low in the cable Integrated Service Digital Network altogether.
Preferably, low frequency signal comprises a plurality of reverse signals from a plurality of control ends, and step S10 specifically comprises: receive a plurality of reverse signals with time division way from a plurality of control ends; After reading low frequency signal, the low channel of coaxial cable specifically comprises: from the low frequency signal that reads, obtain a plurality of reverse signals with time division way; And a plurality of reverse signals are fed back to a plurality of control end distinguish corresponding headend equipment.
Preferably, a plurality of signals comprise following at least a: RS485 signal, fire-fighting signal, telephone signal, broadcast singal.Preferably, low frequency signal is modulated on 0～120V DC level, forms transmission signals, and described low frequency bandwidth is 0-1MHz.
The preferred embodiments of the present invention are included in safety defense monitoring system and the fire fighting monitoring alarming system and use:
1, universal monitoring system is used for reverse transfer RS485 control signal.
2, in elevator monitoring, use.The transmission of elevator inner video image is anti-interference, background music broadcasting at ordinary times, and the emergency alarm button is cried for help in accident, and control centre receives the report for police service and pipes, and automatic switchover warning elevator image is to everyone carries out speech talkback in the elevator.
3, the colliery alarm monitoring system is used.
The annual a lot of collieries serious accident that takes place of China, the life and the property loss that cause thus are huge.Especially people's life is valuable, takes effective rescue when how to avoid the generation of serious accident and accident to take place, and is the emphasis problem of security protection always.Video monitoring system has been installed in now a lot of collieries, but the effect that existing supervisory control system is played is limited, introduces a kind of monitoring safety-protection system of brand new ideas here.It both can play the prevention effect that reduces or avoid accident to take place, and also can assist the rescue measure of taking when accident takes place.
Fig. 6 shows according to the preferred embodiment of the invention cable Integrated Service Digital Network safety monitoring system operation schematic diagram altogether.Altogether cable Integrated Service Digital Network coal mine safety monitoring system is realized the transmission of multiple signal not only can realizing multiple function by a cable, also saves a large amount of wire rods, work time cost.Multiple signals such as its collection multi-channel video image, audio frequency, methane gas detection alarm, monitoring temperature, urgent broadcast, two-way control are transmitted as one.The realization function is as follows:
During ★ supervisory control system operate as normal, can play voice such as background music, news, notice by broadcasting audio amplifier (passive), can switch each control point image, check field condition.
★ personnel in the pit can get in touch by audio broadcasting intercommunication and Surveillance center, handles urgent or routine matter
★ methane gas detector, detector can be regularly be transferred to Surveillance center with the Monitoring Data of each control point, can realize yellow early warning, orange early warning, red alarm.
The ★ emergency alerts.When the burst emergency, can manually start warning device, directly report to the police and give Surveillance center.
★ is when reporting to the police generation, and control system automatically switches to alarm point audio frequency and video image, and the automatic or manual mode is taked corresponding measure.As survey methane gas and report to the police, can take to start exhaust equipment immediately according to the Monitoring Data that shows, the commanding withdraws by broadcasting, opens measures such as emergency light.
★ with the 220V stand-by power supply line of transfer bus with the pipe transmission, can provide power supply from Control Room when accident occurring, start lighting installation, ventilation equipment, and keep the double-directional speech communication with the scene, auxiliary emergency relief.
4, fire-fighting domain is used.
The multifunction monitoring system that auxiliary fire alarm system is used.
The nonpolarity signal of 24V is transmitted at ordinary times in system, and front end connects alarm probe.After alarm signal, fire alarm system sends signal to Control Software, and video image, the audio frequency of Control Software automatic switchover output alarm point confirm whether report to the police.If false alarm, hand-reset recovers initial monitor state.If determine the condition of a fire, can carry out the interlock control command, control command is switched transmission of control signals with transmission channel, and interlock affects equipment.Headend equipment interlock situation can return to controller by 4 tunnel alarm signals.If need carry out the fire-fighting urgent broadcast, then can select single channel broadcasting, sectorization broadcast and all broadcasting, and changeable different audio-video signal uses for observing the condition of a fire.System can also carry out cascade, realizes long-distance on-line.The preferred embodiment can realize the time-division control transmission in safety defense monitoring system, fire fighting monitoring alarming system, make supervisory control system realize that at the signal of a transmission cable transmission multi-channel video, multichannel voice frequency broadcasting intercommunication, multiple alarm are oppositely controlled, two-way RS485 control.
From above description, as can be seen, the above embodiments of the present invention are in video monitoring system, front-end camera passes modulated high band audio-video signal to the terminal demodulator device by one 75 ohm coaxial cable by modulator, on the terminal demodulator, low frequency auxiliary signal reverse transfer is arrived head-end modulator, shared bandwidth is 0-1MHz, is low channel.24V fire protection warning control signal that transmission signals can be the RS485 control signal, two buses are nonpolarity, 53V telephone signal, 70-120V broadcast singal, new technology has increased the kind of common cable Integrated Service Digital Network transmission signals.Because the effect difference of every kind of signal can divide different time to use same channels transmission signal separately.So just can on one 75 ohm coaxial cable, transmit hundreds of different signal, realize multiple function, save a large amount of cables and working hour expense simultaneously.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a signals reverse transmission system that is used for common cable Integrated Service Digital Network is characterized in that, comprising:
The reverse signal inserter, being used for will be from the low frequency signal reverse transfer of the DC level of control end to coaxial cable, stop high-frequency signal to feed back to described control end simultaneously, stop described low frequency signal to enter to be used for the common cable Integrated Service Digital Network demodulator of the described high-frequency signal of demodulation from described coaxial cable;
Coaxial cable is used for described low frequency signal of reverse transfer and the described high-frequency signal of forward transmitted;
The reverse signal reductor, be used for reading described low frequency signal to feed back to headend equipment from the low channel of described coaxial cable, stop described low frequency signal to enter simultaneously and be used to modulate the common cable Integrated Service Digital Network modulator of described high-frequency signal, and allow described high-frequency signal forward transmitted to described coaxial cable.
2. signals reverse transmission system according to claim 1 is characterized in that, described reverse signal inserter is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part,
Described capacitive part is used for stoping described low frequency signal by described high-frequency signal, enters described cable Integrated Service Digital Network demodulator altogether to stop described low frequency signal;
Described inductive part is used for stoping described high-frequency signal by described low frequency signal, with described low frequency signal reverse transfer to described coaxial cable and stop described high-frequency signal to feed back to described control end.
3. signals reverse transmission system according to claim 1 is characterized in that, described reverse signal reductor is made of the capacitor and inductor coupling circuit that comprises capacitive part and inductive part,
Described capacitive part is used for stoping described low frequency signal by described high-frequency signal, allowing described high-frequency signal forward transmitted to described coaxial cable, and stops described low frequency signal to enter described cable Integrated Service Digital Network modulator altogether;
Described inductive part is used for stoping described high-frequency signal by described low frequency signal, reads described low frequency signal with the low channel from described coaxial cable.
4. signals reverse transmission system according to claim 1 is characterized in that, described low frequency signal comprises a plurality of reverse signals from a plurality of control ends, and described signals reverse transmission system also comprises:
Sub-control circuit during input is used for receiving described a plurality of reverse signal with time division way from described a plurality of control ends, and is transferred to described reverse signal inserter;
Sub-control circuit during output is used for obtaining described a plurality of reverse signal with the described low frequency signal that described time division way reads from described reverse signal reductor, and feeds back to the headend equipment that described a plurality of control end is distinguished correspondence.
5. signals reverse transmission system according to claim 4 is characterized in that,
Sub-control circuit comprises during described input: a plurality of relays are connected between described a plurality of control end and the described reverse signal inserter; And controller, control the work of described a plurality of relays with described time division way.
6. signals reverse transmission system according to claim 4 is characterized in that,
Sub-control circuit comprises during described output: a plurality of relays are connected between described a plurality of headend equipment and the described reverse signal reductor; And controller, control the work of described a plurality of relays with described time division way.
7. according to each described signals reverse transmission system of claim 4 to 6, it is characterized in that described a plurality of reverse signals comprise following at least a: RS485 signal, fire-fighting signal, telephone signal, broadcast singal.
8. according to each described signals reverse transmission system of claim 1 to 6, it is characterized in that described low frequency signal is 0～120V DC level, bandwidth is 0-1MHz.
9. a signals reverse transmission method that is used for common cable Integrated Service Digital Network is characterized in that, may further comprise the steps:
Reception is from the low frequency signal of the DC level of control end;
To coaxial cable, stop high-frequency signal to feed back to described control end simultaneously described low frequency signal reverse transfer, stop described low frequency signal to enter to be used for the common cable Integrated Service Digital Network demodulator of the described high-frequency signal of demodulation from described coaxial cable;
Through the described low frequency signal of coaxial cable reverse transfer, described coaxial cable is the described high-frequency signal of forward transmitted also;
Read described low frequency signal to feed back to headend equipment from the low channel of described coaxial cable, stop described low frequency signal to enter simultaneously and be used to modulate the common cable Integrated Service Digital Network modulator of described high-frequency signal, and allow described high-frequency signal forward transmitted to described coaxial cable.
10. signals reverse transmission method according to claim 9 is characterized in that, described low frequency signal comprises a plurality of reverse signals from a plurality of control ends,
Reception specifically comprises from the low frequency signal of control end: receive described a plurality of reverse signal with time division way from described a plurality of control ends;
After reading described low frequency signal, the low channel of described coaxial cable specifically comprises: from the described low frequency signal that reads, obtain described a plurality of reverse signal with described time division way; And described a plurality of reverse signals are fed back to described a plurality of control end distinguish corresponding headend equipment.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102020157A (en) * | 2010-11-25 | 2011-04-20 | 郭松 | System for controlling the linkage of alarm talkback and video frequency of elevator |
| CN102750805A (en) * | 2012-06-28 | 2012-10-24 | 中昊晨光化工研究院 | Safety monitoring system |
| CN107040392A (en) * | 2015-07-29 | 2017-08-11 | 中兴通讯股份有限公司 | Pseudo-wire dual-homing protection management method and communication equipment |
| CN108124137A (en) * | 2015-07-24 | 2018-06-05 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
| WO2018113590A1 (en) * | 2016-12-23 | 2018-06-28 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
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2008
- 2008-08-07 CN CN200810146076A patent/CN101646110A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020157A (en) * | 2010-11-25 | 2011-04-20 | 郭松 | System for controlling the linkage of alarm talkback and video frequency of elevator |
| CN102750805A (en) * | 2012-06-28 | 2012-10-24 | 中昊晨光化工研究院 | Safety monitoring system |
| CN108124137A (en) * | 2015-07-24 | 2018-06-05 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
| CN108124137B (en) * | 2015-07-24 | 2019-11-08 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
| CN107040392A (en) * | 2015-07-29 | 2017-08-11 | 中兴通讯股份有限公司 | Pseudo-wire dual-homing protection management method and communication equipment |
| CN107040392B (en) * | 2015-07-29 | 2020-08-04 | 南京中兴软件有限责任公司 | Pseudo wire dual-homing protection management method and communication equipment |
| WO2018113590A1 (en) * | 2016-12-23 | 2018-06-28 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| US10827148B2 (en) | 2016-12-23 | 2020-11-03 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| US11190730B2 (en) | 2016-12-23 | 2021-11-30 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
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Application publication date: 20100210 |