CN104581094A - Video optical transceiver and detecting method thereof - Google Patents
Video optical transceiver and detecting method thereof Download PDFInfo
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- CN104581094A CN104581094A CN201410774577.8A CN201410774577A CN104581094A CN 104581094 A CN104581094 A CN 104581094A CN 201410774577 A CN201410774577 A CN 201410774577A CN 104581094 A CN104581094 A CN 104581094A
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Abstract
The invention relates to a video optical transceiver and a detecting method thereof. The video optical transceiver comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises a CCD camera, wherein the CCD camera is connected with an A/D conversion circuit; the A/D conversion circuit is connected with a CPLD main control chip; the CPLD main control chip is connected to an optical module through parallel-serial conversion; a phase-locked loop, a synchronous protector, an EFM data demodulator and a digital attenuator/peak detector are arranged between the CCD camera and the A/D conversion circuit; the receiving terminal comprises an optical module; the optical module is connected with a CPLD main control chip; the CPLD main control chip is connected with a D/A conversion circuit; the D/A conversion circuit is connected with a denoising filter circuit, and then connected with a display; a D/A conversion circuit output video signal is arranged between the D/A conversion circuit and the denoising filter circuit; the D/A conversion circuit output video signal is subjected to synchronous signal separation, and then the interrupt signal is subjected to digital signal processing by the FPGA and then displayed. The video optical transceiver has the advantages of being high in antijamming capability and detecting capability, reducing the noise, and improving the signal quality.
Description
Technical field
The invention belongs to optical transport technology field, be specifically related to a kind of video optical multiplexer, particularly relate to a kind of video optical multiplexer and detection method thereof.
Background technology
Experienced by the development in two generations for the video optical multiplexer of the uncompressed long range propagation of image in video frequency graphic monitoring industry, wherein the first generation is with FM (Frequency Modulation, frequency modulation(FM)) analog video optical transmitter and receiver based on technology, the second generation is the digital video fiber optic transmitter based on the uncompressed time-division multiplex technology of video digitizer, and digital video fiber optic transmitter solves that the transmission capacity of analog video optical transmitter and receiver is few, professional ability is few, signal is easily decayed, the easy shortcoming such as crosstalk and homogeneity of product difference.
When there is frame losing in video, because the unexpected change of video and shakiness cause video signal detection abnormal, and report infrared fault by mistake, jitter is caused to report the problems such as fault by mistake, most signal transacting all carries out in simulation field simultaneously, analog signal processing technology is comparatively large to the interference of signal and distortion effect, makes the signal quality of output poor.
Summary of the invention
The object of the invention is to, overcome the deficiencies in the prior art and provide a kind of and improve signal quality, improve the video optical multiplexer of antijamming capability and detection method thereof that detect.
The object of the present invention is achieved like this: a kind of video optical multiplexer and detection method thereof, it comprises transmitting terminal and receiving terminal, described transmitting terminal, it comprises CCD camera, described CCD camera is connected with A/D change-over circuit, described A/D change-over circuit is connected with CPLD main control chip, and described CPLD main control chip is connected to optical module after parallel/serial conversion, is provided with testing circuit A between described CCD camera and A/D change-over circuit;
Described testing circuit A, it comprises phase-locked loop circuit, and described phase-locked loop circuit is connected with synchronous protection device, and described synchronous protection device is connected with EFM data demodulator, and described data demodulator is connected with digital pad/peak detector;
Described receiving terminal, it comprises optical module, described optical module is connected with CPLD main control chip through serial/parallel conversion, described CPLD main control chip is connected with D/A change-over circuit, described D/A change-over circuit outputting video signal is connected with denoising, filter circuit, described denoising, filter circuit connect display, are provided with testing circuit B between described D/A change-over circuit and denoising, filter circuit;
Described testing circuit, it comprises D/A change-over circuit outputting video signal, described D/A change-over circuit outputting video signal through synchronizing signal be separated after, through FPGA by interrupt signal by Digital Signal Processing after connect display.
Described phase-locked loop circuit is made up of phase discriminator, frequency detector and voltage controlled oscillator.
Described synchronous protection device is connected with control circuit.
Described EFM data demodulator is connected with control circuit.
The numerical portion of the D/A change-over circuit outputting video signal in described receiving terminal comprises the alternative of digital shaping and expansion and field sync signal and system time frequency signal, is designed realize by FPGA.
Described transmitting terminal and receiving terminal pass through Fiber connection.
Detection module in described testing circuit A and testing circuit B is provided with indicator light.
The invention has the beneficial effects as follows: the phase-locked loop circuit in video optical multiplexer transmitting terminal and synchronous protection device ensure that the synchronism stability of Signal transmissions carries out, digital pad/peak detector improves the stability of digital signal in transmitting procedure, the quality of vision signal can be put forward, antijamming capability is strong, detection FPGA in receiving terminal can improve the antijamming capability of detection, decrease the kind of discrete device simultaneously, quantity, further reduce the area of printed circuit board, reduce cost, and solve the impact that electromagnetic interference detects video, reduce the pollution of noise, it is strong that total the present invention has antijamming capability, reduce noise, signal quality improves, the advantage that detectability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of video optical multiplexer of the present invention and detection method thereof.
Embodiment
Embodiment 1
As shown in Figure 1, a kind of video optical multiplexer and detection method thereof, it comprises transmitting terminal and receiving terminal, described transmitting terminal, it comprises CCD camera, and described CCD camera is connected with A/D change-over circuit, and described A/D change-over circuit is connected with CPLD main control chip, described CPLD main control chip is connected to optical module after parallel/serial conversion, is provided with testing circuit A between described CCD camera and A/D change-over circuit;
Described testing circuit A, it comprises phase-locked loop circuit, and described phase-locked loop circuit is connected with synchronous protection device, and described synchronous protection device is connected with EFM data demodulator, and described data demodulator is connected with digital pad/peak detector;
Described receiving terminal, it comprises optical module, described optical module is connected with CPLD main control chip through serial/parallel conversion, described CPLD main control chip is connected with D/A change-over circuit, described D/A change-over circuit outputting video signal is connected with denoising, filter circuit, described denoising, filter circuit connect display, are provided with testing circuit B between described D/A change-over circuit and denoising, filter circuit;
Described testing circuit B, it comprises D/A change-over circuit outputting video signal, described D/A change-over circuit outputting video signal through synchronizing signal be separated after, through FPGA by interrupt signal by Digital Signal Processing after connect display.
The present invention tests in use: the transmitting terminal of video optical multiplexer and receiving terminal are all switched on power, video signal collection is carried out by CCD camera, if normally vision signal can be detected, indicator light then in testing circuit A normally works Chang Liang, digital signal is converted to subsequently by A/D change-over circuit, again encoding digital signals is packed, carry out parallel/serial conversion afterwards and divide being sent to optical module, eventually pass optical module is sent on optical fiber after electrical/optical conversion, is sent to receiving terminal with the form of light signal.
Light signal from optical fiber is converted to electrical signal data bag by the optical module of receiving terminal, by serial/parallel conversion circuit, high-speed serial data bag being converted to low speed digital signal again delivers in CPLD chip, then CPLD delivers in corresponding D/A change-over circuit after decoding to this digital video signal according to corresponding form, then by D/A change-over circuit, digital video signal corresponding for each road is converted to analog signal, finally after denoising sound/filter circuit filters, deliver to display by outputting video signal treatment circuit to show, , if normally vision signal can be detected, indicator light then in testing circuit B normally works Chang Liang, it is strong that total the present invention has antijamming capability, reduce noise, signal quality improves, the advantage that detectability is strong.
Embodiment 2
As shown in Figure 1, a kind of video optical multiplexer and detection method thereof, it comprises transmitting terminal and receiving terminal, described transmitting terminal, it comprises CCD camera, and described CCD camera is connected with A/D change-over circuit, and described A/D change-over circuit is connected with CPLD main control chip, described CPLD main control chip is connected to optical module after parallel/serial conversion, is provided with testing circuit A between described CCD camera and A/D change-over circuit;
Described testing circuit A, it comprises phase-locked loop circuit, and described phase-locked loop circuit is connected with synchronous protection device, and described synchronous protection device is connected with EFM data demodulator, and described data demodulator is connected with digital pad/peak detector;
Described receiving terminal, it comprises optical module, described optical module is connected with CPLD main control chip through serial/parallel conversion, described CPLD main control chip is connected with D/A change-over circuit, described D/A change-over circuit outputting video signal is connected with denoising, filter circuit, described denoising, filter circuit connect display, are provided with testing circuit B between described D/A change-over circuit and denoising, filter circuit;
Described testing circuit B, it comprises D/A change-over circuit outputting video signal, described D/A change-over circuit outputting video signal through synchronizing signal be separated after, through FPGA by interrupt signal by Digital Signal Processing after connect display.
Described phase-locked loop circuit is made up of phase discriminator, frequency detector and voltage controlled oscillator.
Described synchronous protection device is connected with control circuit.
Described EFM data demodulator is connected with control circuit.
The numerical portion of the D/A change-over circuit outputting video signal in described receiving terminal comprises the alternative of digital shaping and expansion and field sync signal and system time frequency signal, is designed realize by FPGA.
Described transmitting terminal and receiving terminal pass through Fiber connection.
Detection module in described testing circuit A and testing circuit B is provided with indicator light.
The present invention tests in use: the transmitting terminal of video optical multiplexer and receiving terminal are all switched on power, video signal collection is carried out by CCD camera, if normally vision signal can be detected, indicator light then in testing circuit A normally works Chang Liang, phase-locked loop circuit in testing circuit A and synchronous protection device ensure that the synchronism stability of Signal transmissions carries out, digital pad/peak detector improves the stability of digital signal in transmitting procedure, digital signal is converted to subsequently by A/D change-over circuit, again encoding digital signals is packed, carry out parallel/serial conversion afterwards and divide being sent to optical module, eventually pass optical module is sent on optical fiber after electrical/optical conversion, receiving terminal is sent to the form of light signal.
Light signal from optical fiber is converted to electrical signal data bag by the optical module of receiving terminal, by serial/parallel conversion circuit, high-speed serial data bag being converted to low speed digital signal again delivers in CPLD chip, then CPLD delivers in corresponding D/A change-over circuit after decoding to this digital video signal according to corresponding form, then by D/A change-over circuit, digital video signal corresponding for each road is converted to analog signal, finally after denoising sound/filter circuit filters, deliver to display by outputting video signal treatment circuit to show, D/A change-over circuit outputting video signal is after synchronizing signal is separated simultaneously, through FPGA by interrupt signal by Digital Signal Processing after connect display, if normally vision signal can be detected, indicator light then in testing circuit B normally works Chang Liang, it is strong that total the present invention has antijamming capability, reduce noise, signal quality improves, the advantage that detectability is strong.
Claims (7)
1. a video optical multiplexer and detection method thereof, it comprises transmitting terminal and receiving terminal, it is characterized in that: described transmitting terminal, it comprises CCD camera, described CCD camera is connected with A/D change-over circuit, described A/D change-over circuit is connected with CPLD main control chip, and described CPLD main control chip is connected to optical module after parallel/serial conversion, is provided with testing circuit A between described CCD camera and A/D change-over circuit;
Described testing circuit A, it comprises phase-locked loop circuit, and described phase-locked loop circuit is connected with synchronous protection device, and described synchronous protection device is connected with EFM data demodulator, and described data demodulator is connected with digital pad/peak detector;
Described receiving terminal, it comprises optical module, described optical module is connected with CPLD main control chip through serial/parallel conversion, described CPLD main control chip is connected with D/A change-over circuit, described D/A change-over circuit outputting video signal is connected with denoising, filter circuit, described denoising, filter circuit connect display, are provided with testing circuit B between described D/A change-over circuit and denoising, filter circuit;
Described testing circuit B, it comprises D/A change-over circuit outputting video signal, described D/A change-over circuit outputting video signal through synchronizing signal be separated after, through FPGA by interrupt signal by Digital Signal Processing after connect display.
2. a kind of video optical multiplexer according to claim 1 and detection method thereof, is characterized in that: described phase-locked loop circuit is made up of phase discriminator, frequency detector and voltage controlled oscillator.
3. a kind of video optical multiplexer according to claim 1 and detection method thereof, is characterized in that: described synchronous protection device is connected with control circuit.
4. a kind of video optical multiplexer according to claim 1 and detection method thereof, is characterized in that: described EFM data demodulator is connected with control circuit.
5. a kind of video optical multiplexer according to claim 1 and detection method thereof, it is characterized in that: the numerical portion of the D/A change-over circuit outputting video signal in described receiving terminal comprises the alternative of digital shaping and expansion and field sync signal and system time frequency signal, is designed realize by FPGA.
6. a kind of video optical multiplexer according to claim 1 and detection method thereof, is characterized in that: described transmitting terminal and receiving terminal pass through Fiber connection.
7. a kind of video optical multiplexer according to claim 1 and detection method thereof, is characterized in that: the detection module in described testing circuit A and testing circuit B is provided with indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410774577.8A CN104581094A (en) | 2014-12-16 | 2014-12-16 | Video optical transceiver and detecting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410774577.8A CN104581094A (en) | 2014-12-16 | 2014-12-16 | Video optical transceiver and detecting method thereof |
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| CN104581094A true CN104581094A (en) | 2015-04-29 |
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| CN201410774577.8A Pending CN104581094A (en) | 2014-12-16 | 2014-12-16 | Video optical transceiver and detecting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851233A (en) * | 2017-01-20 | 2017-06-13 | 中航光电科技股份有限公司 | A kind of HD video optical transmitter and receiver EDID information auto updating methods and device |
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| US20040158742A1 (en) * | 2003-02-07 | 2004-08-12 | Broadon | Secure and backward-compatible processor and secure software execution thereon |
| CN2852568Y (en) * | 2005-12-08 | 2006-12-27 | 韩瑞珍 | Digital video fiber optic transmitter |
| CN200973160Y (en) * | 2006-11-24 | 2007-11-07 | 中国科学院沈阳自动化研究所 | Image centroid calculating device |
| CN202050503U (en) * | 2011-03-11 | 2011-11-23 | 孙飞 | Multichannel uncompressed digital video optical fiber transmission device |
| CN203014773U (en) * | 2012-12-28 | 2013-06-19 | 河南中多科技发展有限公司 | Digital signal processing system |
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2014
- 2014-12-16 CN CN201410774577.8A patent/CN104581094A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040158742A1 (en) * | 2003-02-07 | 2004-08-12 | Broadon | Secure and backward-compatible processor and secure software execution thereon |
| CN2852568Y (en) * | 2005-12-08 | 2006-12-27 | 韩瑞珍 | Digital video fiber optic transmitter |
| CN200973160Y (en) * | 2006-11-24 | 2007-11-07 | 中国科学院沈阳自动化研究所 | Image centroid calculating device |
| CN202050503U (en) * | 2011-03-11 | 2011-11-23 | 孙飞 | Multichannel uncompressed digital video optical fiber transmission device |
| CN203014773U (en) * | 2012-12-28 | 2013-06-19 | 河南中多科技发展有限公司 | Digital signal processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106851233A (en) * | 2017-01-20 | 2017-06-13 | 中航光电科技股份有限公司 | A kind of HD video optical transmitter and receiver EDID information auto updating methods and device |
| CN106851233B (en) * | 2017-01-20 | 2020-04-07 | 中航光电科技股份有限公司 | Automatic updating method and device for EDID information of high-definition video optical transmitter and receiver |
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Address after: Pine Road 450000 of Henan Province, Zhengzhou high tech Industrial Development Zone, No. 36, building 6, 5 St. world Ka Yip Building Room 512 Applicant after: Henan Mingshi Polytron Technologies Inc Address before: High tech Zone Henan city Zhengzhou province 450000 bamboo Street No. 6 Building 02 unit 3 floor of No. 22 east 3 Applicant before: HENAN MINGSHI SAFETY PRECAUTION ENGINEERING CO., LTD. |
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Application publication date: 20150429 |
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