CN104754294A - Converter for converting similar CVBS (Composite Video Broadcast Signal) signal into IP (Internet Protocol) signal - Google Patents
Converter for converting similar CVBS (Composite Video Broadcast Signal) signal into IP (Internet Protocol) signal Download PDFInfo
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- CN104754294A CN104754294A CN201310756449.6A CN201310756449A CN104754294A CN 104754294 A CN104754294 A CN 104754294A CN 201310756449 A CN201310756449 A CN 201310756449A CN 104754294 A CN104754294 A CN 104754294A
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Abstract
The invention creatively provides a converter for converting a similar CVBS (Composite Video Broadcast Signal) signal into an IP (Internet Protocol) signal; after the similar CVBS signal generated by a sending end passes through a coaxial cable and a digital video optical transmitter and receiver in a disguise manner, the converter demodulates the signal; after the signal is subjected to channel decoding and correction, the IP address is recovered, is converted into an Ethernet data package and connected with the Ethernet, so that the purpose of recovering high-definition digital IP video data is achieved. The converter can be adopted to equipment capable of smoothly updating the existing analogue standard-definition video optical fiber monitoring system into a digital high-definition video optical fiber monitoring system or a digital high-definition/analogue standard-definition hybrid video optical fiber monitoring system; the equipment can be used without arranging an optical fiber again, replacing optical transmission equipment and replacing a camera Cloud deck; only a camera probe needs to be replaced and the converter has the features of being minimized in construction work and minimized in modification and updating costs.
Description
Technical field
The invention relates to Video Quality Metric technical field, particularly a kind of transducer turning IP signal for digital high-definition video and class CVBS signal in simulation SD video optical fiber monitoring mixed networking.
Background technology
Along with the development of internet video technology, video networking application demand is at radio and television, and network amusement, meeting is live, educational training, health care, and the industry-by-industries such as safety monitoring start to occur successively, and presents the situation of rapid growth.
Video monitoring is from the stage that simulation SD is rapidly changed to digital high-definition, and market is huge, and growth rate is surprising.But in current all system schemas, digital high-definition video monitoring and simulation SD video monitoring nearly all cannot merge.Especially in the field of remote optical transport, because supervisory control system requires real-time and reliability, traditional analog SD video optical fiber monitoring has mainly been come by digital video fiber optic transmitter.In digital high-definition video optical fiber monitoring field, Present Domestic mainly all-IP HD video optical fiber monitoring system accounts for main flow, promoting SDI mode HD video optical fiber monitoring system abroad, but these two kinds of modes all cannot the compatible traditional analog SD video optical fiber supervisory control system using digital video fiber optic transmitter simultaneously.
Traditional analog SD video uses CVBS composite video signal image signal transmission, and signal bandwidth is 6MHz.First, video camera exports CVBS composite video signal to digital video fiber optic transmitter transmitter, and digital video fiber optic transmitter transmitter front ends ADC uses 12MHz ~ 16MHz frequency to sample to CVBS signal, converts digital signal to, again through compound, be sent on optical fiber by laser after coding; At receiving terminal, digital video fiber optic transmitter receiver receives digital signal from optical fiber, then is reduced to the CVBS signal also corresponding output on each road by DAC.
And digital high-definition IP video camera exports as IP signal, the general maximum support resolution 1920x1080/60 frame format HD video of high-definition camera, IP form is packaged into after compression, data transfer rate is generally 2Mbps ~ 40Mbps, cannot directly by digital video fiber optic transmitter below because bandwidth is too high and signal format is not mated.
If traditional analog SD video will upgrade to high-definition video monitoring, must whole system be upgraded, need the construction problem in the face of staggering amount.Simultaneously due to current digital high-definition video monitoring and analogue system incompatible, even only need several high-definition monitoring point on whole circuit, also all must change all devices, expense is high.
Summary of the invention
The problem that the invention will solve is to provide a kind of transducer turning IP signal for digital high-definition video and class CVBS signal in simulation SD video optical fiber monitoring mixed networking, also can be used for the transformation of existing simulation SD video optical fiber supervisory control system height Qinghua.
For solving the problems of the technologies described above, the technical scheme that the invention adopts is: a kind CVBS signal turns the transducer of IP signal, comprises switch input, variable gain amplifier, digital analog converter, fpga chip, Ethernet physical interface receiving-transmitting device and converter output end; Described fpga chip comprises digital mixing/detection demodulator circuit, trellis decoded module, decoding FEC module and Ethernet media access controller; Variable gain amplifier receives class CVBS signal; Class CVBS signal after variable gain amplifier process is converted to digital signal and sends fpga chip to by digital analog converter; The digital signal of reception is reverted to baseband signal by digital mixing/detection demodulator circuit; Baseband signal inputs decoding FEC module after trellis decoded resume module; Baseband signal inputs Ethernet media access controller and recovers IP address after decoding FEC resume module, and forms ethernet mac frame and export Ethernet physical interface receiving-transmitting device to; The output of Ethernet physical interface receiving-transmitting device connects converter output end.
Further, transducer input interface is BNC connector, and output interface is RJ45 connector.BNC connector connecting coaxial cable, RJ45 connector connects digital high-definition camera.
The advantage that the invention has and good effect are: the signal of " class CVBS " that transmitting terminal generates by the transducer of the invention, after " camouflage " is by coaxial cable below and digital video fiber optic transmitter, carry out demodulation, after carrying out channel-decoding error correction again, recover IP address, convert Ethernet data bag to be connected with Ethernet, reach the object recovering high-definition digital IP video data.Can be used for the equipment that existing simulation SD video optical fiber supervisory control system upgrades to digital high-definition video optical fiber supervisory control system or digital high-definition/simulation SD mixed video optical fiber monitoring system smoothly, this equipment is used not need laying optical fiber again, do not need to change optical transmission device, do not need to change camera pan-tilt, only camera probe need be changed, there is construction volume minimize, the feature of transformation and upgrade cost minimumization.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the invention.
In figure:
1, BNC connector 2, variable gain amplifier 3, digital analog converter 4, fpga chip 5, Ethernet physical interface receiving-transmitting device 6, RJ45 connector
Embodiment
Elaborate with the technical scheme of specific embodiment to the invention by reference to the accompanying drawings.
As shown in Figure 1, a kind CVBS signal turns the transducer of IP signal, comprises BNC connector 1, variable gain amplifier 2, digital analog converter 3, fpga chip 4, Ethernet physical interface receiving-transmitting device 5 and converter output end; Described fpga chip 4 comprises digital mixing/detection demodulator circuit, trellis decoded module, decoding FEC module and Ethernet media access controller; Variable gain amplifier 2 receives class CVBS signal; Class CVBS signal after variable gain amplifier 2 processes by digital analog converter 3 is converted to digital signal and sends fpga chip 4 to; The digital signal of reception is reverted to baseband signal by digital mixing/detection demodulator circuit; Baseband signal inputs decoding FEC module after trellis decoded resume module; Baseband signal inputs Ethernet media access controller and recovers IP address after decoding FEC resume module, and forms ethernet mac frame and export Ethernet physical interface receiving-transmitting device 5 to; The output of Ethernet physical interface receiving-transmitting device 5 connects RJ45 connector 6.Wherein, programmable gain amplifier selected by variable gain amplifier 2.
IP packet is converted to the signal format of " class CVBS " by sending ending equipment, and " camouflage ", by coaxial cable below and digital video fiber optic transmitter, utilizes existing line and equipment to be sent to receiving terminal.Digital video fiber optic transmitter exports on coax " class CVBS ", and signal is incorporated into variable gain amplifier 2 by the BNC connector 1 of transducer in the invention, be input to after treatment in digital analog converter 3 and change digital signal into, transfer the signal to the in fpga chip 4; First signal reverts to baseband signal by digital mixing/detection demodulator circuit in fpga chip 4, then trellis decoded module and forward error correction block is utilized to recover at the error code by occurring during circuit, finally input Ethernet media access controller and recover IP address, and form ethernet mac frame, from fpga chip 4, output to too net physical interface receiving-transmitting device 5, be finally connected on ethernet line by RJ45 connector 6 again.
Above the embodiment of the invention has been described in detail, but described content being only the preferred embodiment of the invention, the practical range for limiting the invention can not being considered to.All equalizations done according to the invention scope change and improve, and all should still belong within this patent covering scope.
Claims (2)
1. a kind CVBS signal turns the transducer of IP signal, it is characterized in that: comprise switch input, variable gain amplifier (2), digital analog converter (3), fpga chip (4), Ethernet physical interface receiving-transmitting device (5) and converter output end; Described fpga chip (4) comprises digital mixing/detection demodulator circuit, trellis decoded module, decoding FEC module and Ethernet media access controller; Variable gain amplifier (2) receives class CVBS signal; Class CVBS signal after variable gain amplifier (2) processes by digital analog converter (3) is converted to digital signal and sends fpga chip (4) to; The digital signal of reception is reverted to baseband signal by digital mixing/detection demodulator circuit; Baseband signal inputs decoding FEC module after trellis decoded resume module; Baseband signal inputs Ethernet media access controller and recovers IP address after decoding FEC resume module, and forms ethernet mac frame and export Ethernet physical interface receiving-transmitting device (5) to; The output of Ethernet physical interface receiving-transmitting device (5) connects converter output end.
2. class CVBS signal according to claim 1 turns the transducer of IP signal, it is characterized in that: transducer input interface is BNC connector (1), and output interface is RJ45 connector (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310756449.6A CN104754294A (en) | 2013-12-31 | 2013-12-31 | Converter for converting similar CVBS (Composite Video Broadcast Signal) signal into IP (Internet Protocol) signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310756449.6A CN104754294A (en) | 2013-12-31 | 2013-12-31 | Converter for converting similar CVBS (Composite Video Broadcast Signal) signal into IP (Internet Protocol) signal |
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| Publication Number | Publication Date |
|---|---|
| CN104754294A true CN104754294A (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310756449.6A Pending CN104754294A (en) | 2013-12-31 | 2013-12-31 | Converter for converting similar CVBS (Composite Video Broadcast Signal) signal into IP (Internet Protocol) signal |
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| Country | Link |
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| CN (1) | CN104754294A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106791705A (en) * | 2017-01-24 | 2017-05-31 | 杭州中威电子股份有限公司 | A kind of simple and direct tunnel HD video of low cost changes system |
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2013
- 2013-12-31 CN CN201310756449.6A patent/CN104754294A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106791705A (en) * | 2017-01-24 | 2017-05-31 | 杭州中威电子股份有限公司 | A kind of simple and direct tunnel HD video of low cost changes system |
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Application publication date: 20150701 |