CN101540869A - Method for multi-information co-cable transmission - Google Patents
Method for multi-information co-cable transmission Download PDFInfo
- Publication number
- CN101540869A CN101540869A CN200910037944A CN200910037944A CN101540869A CN 101540869 A CN101540869 A CN 101540869A CN 200910037944 A CN200910037944 A CN 200910037944A CN 200910037944 A CN200910037944 A CN 200910037944A CN 101540869 A CN101540869 A CN 101540869A
- Authority
- CN
- China
- Prior art keywords
- power supply
- signal
- cable
- altogether
- cable transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Closed-Circuit Television Systems (AREA)
Abstract
The invention discloses a method for multi-information co-cable transmission of audio signals, video signals and power supply signals. The method for multi-information co-cable transmission comprises the steps: loading audio signals into DC power supply signals through modulation by using the direct carrier technology, changing the audio signals into multi-information composite signals, realizing two-way transmission through the same pair of common polyvinyl chloride insulating flexible cables with two non-frequency closed copper cores, and regulating the DC power supply signals at the end point into a stable working power supply suitable for subordinate equipment through voltage stabilization and voltage regulation to supply power for the subordinate equipment directly. The invention is widely applied to security monitoring systems.
Description
Technical field
The present invention relates to the method for signal transmission in a kind of safety-protection system, especially relate to a kind of method of multi-information co-cable transmission.
Background technology
Along with safety-protection system extensive use in daily life, wherein the selection of signal transmission and cable seems more and more important, and as shown in Figure 1, adopting more at present is to send the audio-video signal of video camera to DVR by video coaxial cable; In addition, also need the direct current that the 220V alternating current converts 12V to be carried out distributed power supply to video camera by power supply adaptor, owing to adopt video coaxial cable and adopt the terminal distributed power supply, increased the cost of system, transmission bandwidth and effective propagation path do not reach standard yet under some particular requirement simultaneously, need the support of specialty aspect installation, installation and maintenance are convenient inadequately.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, a kind of method of multi-information co-cable transmission is provided, this transmission method has been realized on a pair of cable transmitting audio signal, vision signal and dc power signal simultaneously, and cancelled the distributed power supply of traditional video monitoring terminal, by the unified power supply of Surveillance center, greatly reduce cost, also improved applicability, it is simple to make that installation and maintenance become.
The technical solution adopted in the present invention is: as shown in Figures 2 and 3, the present invention has realized the signal transmission between the center image watch-dog and terminal monitoring equipment in the safety-protection system, end at described center image watch-dog is provided with demodulation cable transmitter altogether, described demodulation cable transmitter altogether also is circumscribed with power supply, one end of described terminal monitoring equipment is provided with modulation cable transmitter altogether, and described demodulation is total to the cable transmitter and described modulation connects by twisted pair transmission line between the cable transmitter altogether;
Described modulation altogether cable transmitter converts the audio-video signal of terminal monitoring equipment to be fit to the twisted pair transmission line transmission balanced signal and is carried on the power supply signal, directly be transferred to the common cable transmitter of described demodulation and be reduced into audio-video signal, send described center image watch-dog to through the common cable transmitter of described demodulation by twisted pair transmission line;
Simultaneously, the described demodulation power supply signal and the described audio-video signal of cable transmitter end altogether is compounded to form audio frequency and video/power supply mixed signal, send the common cable transmitter of described modulation to by described twisted pair transmission line and decomposite power supply signal, and terminal monitoring equipment is realized power supply.
Described modulation is provided with modulation chip and filter regulator circuit (as shown in Figure 4) in cable transmitter inside altogether, and the power supply of input is powered to modulation chip behind filtering voltage regulation and given the terminal monitoring power devices; Be superimposed upon on the power supply of input after the vision signal modulation of modulation chip with input.
Described demodulation altogether cable transmitter inside is provided with demodulation chip and filter circuit (as shown in Figure 5), and audio frequency and video/power supply mixed signal is through after straight, and the taking-up AC signal is reduced into original audio-video signal then after the demodulation chip demodulation.To the demodulation chip power supply, the audio frequency and video/power supply signal that becomes mixing simultaneously behind filter circuit is given the video terminal power supply and the transmission signals of far-end to external power source after voltage stabilizing.
Described transmission cable is that common non-frequency closes copper core polyvinyl chloride insulation two core flexible cables.
The invention has the beneficial effects as follows: the present invention passes through modulation with audio-video signal, be carried in the dc power signal, become how information combined signal, realize incorgruous transmission by closing copper core polyvinyl chloride insulating flexible cable with the common non-frequency of a pair of 2 cores, simultaneously by voltage stabilizing, pressure regulation, the dc power signal of end points is adjusted into the working power of stable suitable subordinate equipment, directly to subordinate's power devices, cancelled original distributed power supply, lowered system cost, installation and maintenance are also quite simple and easy, do not need specialty support, also are improved on transmission qualities such as transmission bandwidth and effective propagation path.
Description of drawings
Fig. 1 is the prior art constructions schematic diagram;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the schematic diagram that the present invention realizes principle;
Fig. 4 is the fundamental diagram of cable transmitter altogether of modulation described in the present invention;
Fig. 5 is the fundamental diagram of cable transmitter altogether of demodulation described in the present invention;
Fig. 6 is the structural representation of the embodiment of the invention.
A wherein: demodulation is the cable transmitter altogether; B1, B2, Bn: first modulation cable transmitter, second modulation altogether is total to cable transmitter, n modulation cable transmitter altogether; 1: signal lamp; 2: power supply indicator; The 3:BNC female seat; 4,5: pressure line terminal; The 6:RCA male; The 7:BNC male.
Embodiment
As shown in Figure 6, the demodulation that is positioned at the A place is total to the cable transmitter and promptly is total to cable transmitter A, the dc power signal that the 220V ac supply signal is rectified into 18V outputs on the pressure line terminal that is positioned at diagram 4 places, closing copper core polyvinyl chloride insulating flexible cable by one the 2 common non-frequency of core again is transferred to dc power signal on the pressure line terminal that is positioned at diagram 5 places, give the modulation that is positioned at the B1 place and be total to the cable transmitter, be total to the automatic voltage regulation of cable transmitter again by modulation, the 12V direct current signal that regulating circuit is stable with the DC power supply furnishing, the RCA male at 6 places by being arranged in diagram, RCA female seat butt joint with video camera, provide stable 12V dc supply to video camera, video camera is started working.
The BNC male that is positioned at 7 places is docked with the BNC female seat of video camera, the audio-video signal of video camera is passed to the modulation that is arranged in diagram B1 place be total to the cable transmitter, modulation cable transmitter altogether is modulated into this audio-video signal the balanced signal that suitable common non-frequency closes the transmission of copper core polyvinyl chloride insulating flexible cable again, be carried in the power supply signal, give the pressure line terminal that is arranged in diagram 5 places, the non-frequency of same a pair of common 2 cores by the transmission power supply signal closes copper core polyvinyl chloride insulating flexible cable again, this balanced signal is passed on the pressure line terminal that is arranged in diagram 4 places, and delivering to as shown, the demodulation of position, A place is total to the cable transmitter;
Demodulation cable transmitter altogether by the BNC female seat output at 3 places as shown, is given the DVR or the monitor of rear end again by the balanced signal demodulation that receives is reduced into audio-video signal.
What be positioned at 2 places is power supply indicator, shows the operating state of each road power supply respectively, and what be positioned at 1 place is signal lamp, shows the operating state of each road signal transmission respectively.
In addition this scheme and the described existing scheme of Fig. 1 be in the comparison of transmitting on actual effect and the transmission quality, as following table:
| Technical scheme | Transmission medium | Attenuation constant | Transmission bandwidth | The transmission rate scope | Effective propagation path |
| Original scheme | |
4～ 22db/100m | 8MHz | 200~300m | |
| The patent scheme | Copper core |
1～10 db/100m | 250MHz | 168～ 2048kbit/s | 300～500m |
Two kinds of technical scheme comparisons (is example with single channel 200m) on system forms:
Two kinds of technical scheme comparisons (is example with single channel 200m) on practical characteristic:
Remarks: system cost (original scheme: 300 yuan of coaxial cable 200m, 10 yuan of copper core flexible cable 20m, 1 pair 1 yuan of BNC female seat, 15 yuan of power supply adaptor 1PCS; 100 yuan in patent scheme: 100 yuan of copper core flexible cable 200m, common cable transmitter A+B one cover).
Claims (3)
1, a kind of method of multi-information co-cable transmission, be used for realizing the signal transmission between the center image watch-dog and terminal monitoring equipment in the safety-protection system, it is characterized in that: the end at described center image watch-dog is provided with demodulation cable transmitter altogether, described demodulation cable transmitter altogether also is circumscribed with power supply, one end of described terminal monitoring equipment is provided with modulation cable transmitter altogether, and described demodulation is total to the cable transmitter and described modulation connects by twisted pair transmission line between the cable transmitter altogether;
Described modulation altogether cable transmitter converts the audio-video signal of terminal monitoring equipment to be fit to the twisted pair transmission line transmission balanced signal and is carried on the power supply signal, directly be transferred to the common cable transmitter of described demodulation and be reduced into audio-video signal, send described center image watch-dog to through the common cable transmitter of described demodulation by twisted pair transmission line;
Simultaneously, the described demodulation power supply signal and the described audio-video signal of cable transmitter end altogether is compounded to form audio frequency and video/power supply mixed signal, send the common cable transmitter of described modulation to by described twisted pair transmission line and decomposite power supply signal, and terminal monitoring equipment is realized power supply.
2, the method for a kind of multi-information co-cable transmission according to claim 1, it is characterized in that: described demodulation is provided with filter circuit in cable transmitter inside altogether, described filter circuit converts the ac supply signal of externally fed power supply dc power signal to and is compounded to form audio frequency and video/power supply mixed signal with described audio-video signal, described modulation is provided with filter regulator circuit in cable transmitter inside altogether, the dc power signal of input is adjusted into the working power of suitable described terminal monitoring equipment.
3, the method for a kind of multi-information co-cable transmission according to claim 1 and 2, it is characterized in that: described twisted pair transmission line is that common non-frequency closes copper core polyvinyl chloride insulation two core flexible cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910037944A CN101540869A (en) | 2009-03-16 | 2009-03-16 | Method for multi-information co-cable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910037944A CN101540869A (en) | 2009-03-16 | 2009-03-16 | Method for multi-information co-cable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101540869A true CN101540869A (en) | 2009-09-23 |
Family
ID=41123826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910037944A Pending CN101540869A (en) | 2009-03-16 | 2009-03-16 | Method for multi-information co-cable transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101540869A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614870A (en) * | 2020-04-24 | 2020-09-01 | 北京中庆现代技术股份有限公司 | Distributed camera management system |
-
2009
- 2009-03-16 CN CN200910037944A patent/CN101540869A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614870A (en) * | 2020-04-24 | 2020-09-01 | 北京中庆现代技术股份有限公司 | Distributed camera management system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201378853Y (en) | Multi-message common-cable transmission equipment | |
| CN101540869A (en) | Method for multi-information co-cable transmission | |
| CN105322982A (en) | Differential coupled communication method applied to high-speed power line carrier (H-PLC) system | |
| CN202353710U (en) | Power line video surveillance system | |
| CN104779975A (en) | A differential coupling communication device of high speed power line carrier system | |
| CN104284071A (en) | Infrared high-definition surveillance camera based on transmission of power modulator-demodulators | |
| CN103684520A (en) | Satellite intermediate frequency signal conversion device applied to on-board two-way communication antenna | |
| CN209805823U (en) | Network transmission equipment for co-cable transmission of data and power supply | |
| CN102724473A (en) | Two-wire multichannel signal superposition/separation system | |
| CN204377035U (en) | A kind of video frequency transmitter | |
| CN206865629U (en) | Coaxial cable power supply video transmitter | |
| CN203261418U (en) | Ethernet coaxial cable converter | |
| CN203618086U (en) | Video signal transmission system based on twisted pairs | |
| CN201718055U (en) | Mobile communication transmission grounding device | |
| CN206865632U (en) | Video transmitter | |
| CN202652400U (en) | Two-wire-system multi-channel signal superposition/separation system | |
| CN202282835U (en) | Lossless relay multiplexer for digital videos | |
| CN204733280U (en) | Four road AHD video superimpose transmitters | |
| CN201766660U (en) | Novel twisted pair transmission system | |
| CN203859824U (en) | Bulb type power network camera | |
| CN201509271U (en) | Coaxial transmission monitoring device capable of calling at fixed position and talking back | |
| WO2018223716A1 (en) | Power carrier communication network monitoring system | |
| CN209250661U (en) | Wireless session serving BS | |
| CN204539329U (en) | A kind of transmission system of high-definition digital video signal of uncompressed | |
| CN107342872A (en) | A kind of multimedia dispensing device, reception device and Transmission system for transmitting electric energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090923 |