CN205485463U - Video analog signal sample and hold treatment circuit - Google Patents
Video analog signal sample and hold treatment circuit Download PDFInfo
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- CN205485463U CN205485463U CN201620098494.6U CN201620098494U CN205485463U CN 205485463 U CN205485463 U CN 205485463U CN 201620098494 U CN201620098494 U CN 201620098494U CN 205485463 U CN205485463 U CN 205485463U
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Abstract
The utility model discloses a treatment circuit, in particular to video analog signal sample and hold treatment circuit. The utility model discloses an including following module: multiway switch: be used for receiving multichannel video analog signal, under single -chip microcomputer module control, with signal transmission to sample and hold module, the sample and hold module: sample quick change's video analog signal and keep, analog -to -digital conversion module: arrive single -chip module with analog signal transition for digital signal transmission, single -chip module: handle back, the digital analog conversion module of redispatching with received video digital signal, the digital analog conversion module: convert received video digital signal into the video analog signal filter circuit that redispatches, filter circuit: the video analog signal who comes the transmission of digital analog conversion module handles back output, the utility model discloses the sampling rate is high, sustain voltage descends slowly, the precision is high, changes video analog signal effectively, has realized multipath simulation signal timesharing conversion through the many -way selection moreover.
Description
Technical field
The present invention relates to a kind of process circuit, process circuit particularly to a kind of video analog signal sampling holding.
Background technology
Video analog signal refers to that each two field picture is the actual image signal of the natural scene obtained in real time.Video analog signal has low cost and the advantage such as Well-recovered, and video pictures often gives a kind of sensation on the spot in person of people.But its disadvantage is no matter that the image being recorded is how well, after long range propagation, the quality of the picture of video all can be substantially reduced, or after multiple copies, the distortion of picture will be clearly.
Simultaneously, it is many that video analog signal takies resource, stores and retrieves inconvenience, when transmission range is long, signal generation attenuation, distortion, group delay, and easily it is disturbed, makes image quality decrease, secondly, when wired analog signal is in monitoring device, cannot connect to the Internet, can only monitoring site in a point-to-point fashion, make installation work amount huge.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of prior art, it is provided that a kind of video analog signal sampling holding processes circuit.
In order to realize foregoing invention purpose, the invention provides techniques below scheme:
A kind of video analog signal sampling holding processes circuit, including with lower module: variable connector: be used for receiving multi-channel video analogue signal, under one-chip computer module control, transfers signals to sampling and keeps module；Sampling keeps module: is sampled by fast-changing video analog signal and keeps, then being transferred to analog-to-digital conversion module；Analog-to-digital conversion module: video analog signal is converted to video signal and is transferred to one-chip computer module；One-chip computer module: after being processed by the video signal received, re-send to D/A converter module；D/A converter module: the video signal received is converted to video analog signal and re-sends to filter circuit；Filter circuit: video analog signal D/A converter module transmitted exports after processing.
Variable connector uses 4051 interface circuits, and the control end of 4051 connects single-chip microcomputer, and 4051 have low conduction impedance and the lowest by leakage current, it is ensured that the stability of signal.
Keeping sampling module to use LF398, LF398 to have continuous signal function with zero-order holder output signal after discrete, sampling rate is high, keep slowing down under voltage, precision is high.
Analog-to-digital conversion module uses ADC0809, the channel address Strobe input of ADC0809 is connected with single-chip microcomputer by latch 74LS373, ADC0809 has 8 path analoging switch and associating addressing logic, itself IN0～IN7 is input end of analog signal, FPDP D0～D7 is directly connected to the data/address bus of single-chip microcomputer, it is achieved data are transmitted.
One-chip computer module uses AT89C51, is compressed digital video signal processing.
D/A converter module uses DAC0832, DAC0832 is 8 parallel-by-bit interface CMOS integrated circuits, also the data/address bus with single-chip microcomputer is joined directly together, it uses single buffer working method, internal input register can latch the data that monolithic is sent here, after digital video information runs up to certain data volume, exported by two delivery outlet through conversion.
Filter circuit uses two integrated transporting discharging LM324, the input of integrated transporting discharging U10A connects the outfan of D/A converter module, the outfan of integrated transporting discharging U10A is connected to the negative input end of integrated transporting discharging U10B by resistance R8, the positive input terminal ground connection of integrated transporting discharging U10B, the negative input end of integrated transporting discharging U10B is connected to its outfan by resistance R7, the outfan of integrated transporting discharging U10B passes through load resistance R9 output signal, the two ends of load resistance R9 are respectively by electric capacity C4 and C5 ground connection, DAC0832 belongs to current mode output, filter circuit is first converted into voltage output, glitch-free video analog signal is exported after being filtered by electric capacity C4 and C5.
Compared with prior art, beneficial effects of the present invention: sampling rate is high, keep slowing down under voltage, precision is high, effectively be converted to video analog signal be converted to video analog signal after digital signal processes, and achieve multichannel analog signals timesharing by multi-path choice and change.
Accompanying drawing explanation
Fig. 1 is native system complete schematic；
Fig. 2 is variable connector schematic diagram；
Fig. 3 keeps module principle figure for sampling；
Fig. 4 is analog-to-digital conversion module and one-chip computer module catenation principle figure；
Fig. 5 is D/A converter module and one-chip computer module catenation principle figure；
Fig. 6 is filter circuit schematic diagram.
Detailed description of the invention
Below in conjunction with test example and detailed description of the invention, the present invention is described in further detail.But this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to below example, and all technology realized based on present invention belong to the scope of the present invention.
Embodiment
A kind of video analog signal sampling holding processes circuit, including with lower module: variable connector: be used for receiving multi-channel video analogue signal, under one-chip computer module control, transfers signals to sampling and keeps module；Sampling keeps module: is sampled by fast-changing video analog signal and keeps, then being transferred to analog-to-digital conversion module；Analog-to-digital conversion module: video analog signal is converted to video signal and is transferred to one-chip computer module；One-chip computer module: after being processed by the video signal received, re-send to D/A converter module；D/A converter module: the video signal received is converted to video analog signal and re-sends to filter circuit；Filter circuit: video analog signal D/A converter module transmitted exports after processing.
Variable connector uses 4051 interface circuits, and the control end of 4051 connects single-chip microcomputer, and 4051 have low conduction impedance and the lowest by leakage current, it is ensured that the stability of signal.
Keeping sampling module to use LF398, LF398 to have continuous signal function with zero-order holder output signal after discrete, sampling rate is high, keep slowing down under voltage, precision is high.
Analog-to-digital conversion module uses ADC0809, the channel address Strobe input of ADC0809 is connected with single-chip microcomputer by latch 74LS373, ADC0809 has 8 path analoging switch and associating addressing logic, itself IN0～IN7 is input end of analog signal, FPDP D0～D7 is directly connected to the data/address bus of single-chip microcomputer, it is achieved data are transmitted.
One-chip computer module uses AT89C51, is compressed digital video signal processing.
D/A converter module uses DAC0832, DAC0832 is 8 parallel-by-bit interface CMOS integrated circuits, also the data/address bus with single-chip microcomputer is joined directly together, it uses single buffer working method, internal input register can latch the data that monolithic is sent here, after digital video information runs up to certain data volume, exported by two delivery outlet through conversion.
Filter circuit uses two integrated transporting discharging LM324, the input of integrated transporting discharging U10A connects the outfan of D/A converter module, the outfan of integrated transporting discharging U10A is connected to the negative input end of integrated transporting discharging U10B by resistance R8, the positive input terminal ground connection of integrated transporting discharging U10B, the negative input end of integrated transporting discharging U10B is connected to its outfan by resistance R7, the outfan of integrated transporting discharging U10B passes through load resistance R9 output signal, the two ends of load resistance R9 are respectively by electric capacity C4 and C5 ground connection, DAC0832 belongs to current mode output, filter circuit is first converted into voltage output, glitch-free video analog signal is exported after being filtered by electric capacity C4 and C5.
Claims (7)
1. a video analog signal sampling holding processes circuit, it is characterised in that include with lower module:
Variable connector: be used for receiving multi-channel video analogue signal, under one-chip computer module control, transfers signals to sampling and keeps module；
Sampling keeps module: is sampled by fast-changing video analog signal and keeps, then being transferred to analog-to-digital conversion module；
Analog-to-digital conversion module: video analog signal is converted to video signal and is transferred to one-chip computer module；
One-chip computer module: after being processed by the video signal received, re-send to D/A converter module；
D/A converter module: the video signal received is converted to video analog signal and re-sends to filter circuit；
Filter circuit: video analog signal D/A converter module transmitted exports after processing.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterised in that described variable connector uses 4051 interface circuits, the control end of 4051 to connect single-chip microcomputer.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterised in that described holding sampling module uses LF398.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterised in that described analog-to-digital conversion module uses the channel address Strobe input of ADC0809, ADC0809 to be connected with single-chip microcomputer by latch 74LS373.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterised in that described one-chip computer module uses AT89C51.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterised in that described D/A converter module uses DAC0832.
A kind of video analog signal sampling holding the most according to claim 1 processes circuit, it is characterized in that, described filter circuit uses two integrated transporting discharging LM324, the input of integrated transporting discharging U10A connects the outfan of D/A converter module, the outfan of integrated transporting discharging U10A is connected to the negative input end of integrated transporting discharging U10B by resistance R8, the positive input terminal ground connection of integrated transporting discharging U10B, the negative input end of integrated transporting discharging U10B is connected to its outfan by resistance R7, the outfan of integrated transporting discharging U10B passes through load resistance R9 output signal, the two ends of load resistance R9 are respectively by electric capacity C4 and C5 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620098494.6U CN205485463U (en) | 2016-02-01 | 2016-02-01 | Video analog signal sample and hold treatment circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620098494.6U CN205485463U (en) | 2016-02-01 | 2016-02-01 | Video analog signal sample and hold treatment circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205485463U true CN205485463U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620098494.6U Expired - Fee Related CN205485463U (en) | 2016-02-01 | 2016-02-01 | Video analog signal sample and hold treatment circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014432A (en) * | 2017-04-12 | 2017-08-04 | 上海琪云压缩空气系统服务有限公司 | A kind of analog signal monitoring system and method |
-
2016
- 2016-02-01 CN CN201620098494.6U patent/CN205485463U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014432A (en) * | 2017-04-12 | 2017-08-04 | 上海琪云压缩空气系统服务有限公司 | A kind of analog signal monitoring system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wu Dacong Inventor before: Wu Kai Inventor before: Liu Fei Inventor before: Zhang Jian Inventor before: Li Cheng |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170427 Address after: 510630 Tianhe District, Guangzhou, Tianhe North Road, No. 4, building on the floor (self A493A unit) (900) Patentee after: Guangzhou Mdt InfoTech Ltd Address before: 610041 Sichuan province Chengdu Tianfu four Street No. 66 Building 2 floor 8 No. 3 Patentee before: CHENGDU KECHUANGGU TECHNOLOGY CO., LTD. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20180201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |