CN101179708B - Circuit of S video and compound video simultaneous output suitable for platform camera - Google Patents
Circuit of S video and compound video simultaneous output suitable for platform camera Download PDFInfo
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- CN101179708B CN101179708B CN2007101500052A CN200710150005A CN101179708B CN 101179708 B CN101179708 B CN 101179708B CN 2007101500052 A CN2007101500052 A CN 2007101500052A CN 200710150005 A CN200710150005 A CN 200710150005A CN 101179708 B CN101179708 B CN 101179708B
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- 239000002131 composite material Substances 0.000 claims abstract description 23
- 230000003139 buffering effect Effects 0.000 claims abstract description 4
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract 2
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- 238000010586 diagram Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000003754 machining Methods 0.000 description 1
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Abstract
The invention relates to a circuit applicable for outputting S video and composite video of a pan-tilt camera at the same time, which is technically characterized in that: three current loop lines are respectively connected with a brightness signal input circuit, a chroma signal input circuit and a reference ground; wherein, the brightness signal input circuit and the chroma signal input circuit are connected with an S connector; signal is led out from nodes of the brightness signal input circuit and the chroma signal input circuit; then a standard composite video baseband signal (CVBS) is obtained on an output connector through a CVBS signal output circuit after the signal is simulated with addition as well as buffering and enlarging on a Y/C signal mixing and a buffer amplifier. Based on the principle that the brightness signal and chroma signal of S-Video signal is capable of being mixed into a composite video baseband signal, only three current loop lines are used for realizing synchronous output of S-Video and CVBS signal of the cloud platform camera, thereby effectively decreasing the cost of the cloud platform camera system. The invention is applicable under the condition of signal output of the composite video baseband as well as the synchronous output of Y/C separated video signal of the cloud platform camera equipped with a high-grade integration camera.
Description
Technical field
The invention belongs to the video monitoring front end equipment video signal transmission interface of safety precaution supervisory control system, be applicable to that with collector ring (Slip Ring) be the monopod video camera of signal transmission medium, the especially a kind of S video of monopod video camera and circuit that composite video is exported simultaneously of being applicable to.
Background technology
Monopod video camera requires 360 ° of rotations continuously in the horizontal direction, also will guarantee being electrically connected between rotating part and the stationary part simultaneously, and what lean on is exactly collector ring.What the miniature collector ring that uses in the monopod video camera adopted is that precious metal material and precise machining process are made, the proportion that its cost accounts for the whole cost of monopod video camera is sizable, especially work as required current collection loop wire number more for a long time, its cost impact is more outstanding.So monopod video camera manufacturer is all carefully weighed between cost and function usually.
Small-sized integrated video camera generally need be carried in the monopod video camera system, and high-grade integrated camera all has composite video baseband signal (CVBS) output and the output of Y/C separating video (S-Video) signal.As everyone knows, the latter can provide than the former better picture playback quality, and the former transmission means is very simple.The CVBS signal only need take two current collection loop wire numbers, and the S-Video signal needs three current collection loop wire numbers at least; (under a lot of situations, it is necessary doing like this) also needs 4 current collection loop wire numbers at least when requiring two kinds of signals to export simultaneously.Therefore when current collection loop wire number was comparatively nervous, most monopod video camera products then had to select to abandon S-Video output, with the suitable cost performance of assurance system.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of S video that is applicable to monopod video camera that S-Video that three current collection loop wire numbers just can realize monopod video camera and CVBS signal export simultaneously and circuit that composite video is exported simultaneously of only using is provided.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of S video of monopod video camera and circuit that composite video is exported simultaneously of being applicable to, it is characterized in that: three current collection loop wires connect luminance signal input circuit, carrier chrominance signal input circuit and reference ground respectively, and the brightness incoming line inserts the S connector through brightness buffer amplifier circuit, brightness signal output circuit; The carrier chrominance signal input circuit inserts the S connector through chroma buffer amplifying circuit, carrier chrominance signal output circuit; In addition, signal is drawn respectively and mix and buffer amplifier carries out analog addition and buffering is amplified after obtain the composite video baseband signal CVBS of standard behind the CVBS signal output apparatus at the composite video out connector from the node of luminance signal input signal and carrier chrominance signal input circuit at y/c signal.
And, described brightness and chroma buffer amplifying circuit all are to be to constitute and its gain equals or is slightly larger than 2 wideband amplification circuit by broadband operational amplifier, its signal behind output circuit separately, can obtain the luminance signal and the carrier chrominance signal of standard respectively on out connector separately.
And described S connector is the S-Video socket.
And described composite video out connector is RCA or the bnc connector of characteristic impedance 75 Ω.
Advantage of the present invention and good effect are:
The principle that the present invention can synthesize composite video baseband signal (CVBS) according to brightness (Y-Luminance) signal and colourity (C-Chroma) signal of S-Video signal, only use three current collection loop wire numbers just can realize that the S-Video of monopod video camera and CVBS signal export simultaneously, reduce the cost of monopod video camera system thus effectively, be particularly useful for being equipped with monopod video camera composite video baseband signal (CVBS) output of high-grade integrated camera and the situation that Y/C separating video (S-Video) signal is exported simultaneously.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is a control circuit schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described; Present embodiment is illustrative, rather than determinate, can not limit protection scope of the present invention according to following examples.
The present invention is applicable to that with collector ring (Slip Ring) be the monopod video camera of signal transmission medium.
Referring to Fig. 1, brightness (Luminance also claims Y) signal, colourity (Chroma also claims C) signal and reference ground (AGND) are introduced by three current collection loop wire Line 1, Line 2 and Line 3.Luminance and Chroma signal are the standard signal level: for the PAL television system, in 75 Ω loads, the Luminance signal is that 700mVp-p, Chroma signal are that 663mV is to 883mV.
Luminance (Y) signal and Chroma (C) signal respectively feed-in separately independently signal input circuit (Luminance-Y Signal Input Circuit and Chroma-C Signal InputCircuit) to satisfy the requirement of input signal to load impedance; The output of finishing signal through separately signal damping amplifying circuit (Luminance-Y Signal Buffer Circuit and Chroma-C Signal BufferCircuit) and signal output apparatus separately (Luminance-Y Signal Output Circuit and Chroma-C Signal Output Circuit) again.The signal damping amplifying circuit is that basic comprising, gain equal or be slightly larger than 2 wideband amplification circuit by broadband operational amplifier, its output can obtain the Luminance-YSignal and the Chroma-C Signal of standard on S connector separately behind output circuit.Among the figure, this connector is generally general S-Video socket.
Meanwhile, from the appropriate node of Luminance-Y Signal Input Circuit and Chroma-C SignalInput Circuit Luminance-Y Signal and Chroma-C Signal are drawn respectively, deliver to y/c signal mixing and buffer amplifier (Y/C Mixed and Buffer Circuit) and carry out analog addition and buffering amplification, behind CVBS signal output apparatus (CVBS Signal OutputCircuit), can on the composite video out connector, obtain the CVBS (composite video baseband signal) of standard, among the figure, this connector is generally RCA or the bnc connector of characteristic impedance 75 Ω.Because y/c signal mixes and buffer amplifier does not directly obtain signal from Luminance-Y Signal Input Circuit and Chroma-C Signal Input Circuit, and will obtain signal with the form of shunt resistance, so y/c signal mixes and buffer amplifier needs greater than 2 gain level to satisfy the needs of output signal level.
Fig. 2 is an enforcement electrical schematic diagram of the present invention, and its circuit editor order is corresponding with the block diagram of Fig. 1; The discharge circuit of U1, U2 and U3 is Chroma-C Signal Buffer Circuit, Luminance-Y Signal Buffer Circuit and the Y/C Mixed and Buffer Circuit of corresponding diagram 1 respectively.
R1, C2 and R7, C6 form the input circuit of Chroma-C Signal Input Circuit and Luminance-Y Signal Input Circuit, about general value 75 Ω of R1, R7, C2 value 1000P is between the 2200P, R2, R3 and R10, R11 are respectively U1 and U2 sets up a suitable bias voltage, U1, U2 are operated under the single power supply voltage conditions, the span of R2, R3, R10, R11 is according to selected amplifier electrical characteristics, between tens to hundreds of K Ω.R5, R4, C1 and R14, R12, C3 constitute typical amplifier feedback control loop, general R4=R5=R14=R12 according to selected amplifier electrical characteristics, can select in tens K Ω scopes at hundreds of Ω, C1 be 1000P between the 2200P, and C3 is that tens μ F are between the tens μ F.C4, C9 are the output capacitance of Chroma-C Signal OutputCircuit, Luminance-Y Signal Output Circuit, C4 be 1000P between the 2200P, C9 is then at tens to the hundreds of μ F orders of magnitude.R6, R15 are the output resistance of Chroma-C SignalOutput Circuit, Luminance-Y Signal Output Circuit, value 75 Ω or smaller.C5, C7 exchange on R7, R1 and are coupled out Luminance-Y Signal, Chroma-C Signal deliver to the U3 composition simultaneously through R8, R9 Y/C Mixed and Buffer Circuit.For not making Y/C Mixed and Buffer Circuit influence Luminance-Y Signal BufferCircuit and Chroma-C Signal Buffer Circuit, the value of R8, R9 should be generally tens K Ω to tens K Ω much larger than 75 Ω.The effect of R16, R17 and span are identical with R2, R3 and R10, R11.The effect of R18, R13, C8 and value and R14, R12, C3 are identical, meet the demands for making output level, and R18 can be greater than R13.C10 is the output capacitance of CVBS Signal Output Circuit, and its value is identical with C9, and R19 is the output resistance of CVBS Signal Output Circuit, and its value is identical with R15.
Because the power supply and the power supply decoupling of operational amplifier partly belong to known technology, so this electrical schematic diagram is not drawn this part.
The optimization method that above-mentioned signal damping amplifying circuit can referenced patent application number be provided in the document " gain programmable vision buffer amplifier circuit with SAG compensation " for _ 200710057682.X.Do not repeat them here.
Claims (4)
1. one kind is applicable to the S video of monopod video camera and the circuit that composite video is exported simultaneously, it is characterized in that: three current collection loop wires connect luminance signal input circuit, carrier chrominance signal input circuit and reference ground respectively, and the luminance signal input circuit inserts the S connector through brightness buffer amplifier circuit, brightness signal output circuit; The carrier chrominance signal input circuit inserts the S connector through chroma buffer amplifying circuit, carrier chrominance signal output circuit; In addition, signal is drawn respectively and mix and buffer amplifier carries out analog addition and buffering is amplified after obtain the composite video baseband signal CVBS of standard behind the CVBS signal output apparatus at the composite video out connector from the node of luminance signal input circuit and carrier chrominance signal input circuit at y/c signal.
2. the S video of monopod video camera and the circuit that composite video is exported simultaneously of being applicable to according to claim 1, it is characterized in that: described brightness and chroma buffer amplifying circuit all are to be to constitute and its gain equals or is slightly larger than 2 wideband amplification circuit by broadband operational amplifier, its signal behind output circuit separately, can obtain the luminance signal and the carrier chrominance signal of standard respectively on out connector separately.
3. the S video of monopod video camera and the circuit that composite video is exported simultaneously of being applicable to according to claim 1 and 2, it is characterized in that: described S connector is the S-Video socket.
4. the S video of monopod video camera and the circuit that composite video is exported simultaneously of being applicable to according to claim 1, it is characterized in that: described composite video out connector is RCA or the bnc connector of characteristic impedance 75 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101500052A CN101179708B (en) | 2007-10-31 | 2007-10-31 | Circuit of S video and compound video simultaneous output suitable for platform camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101500052A CN101179708B (en) | 2007-10-31 | 2007-10-31 | Circuit of S video and compound video simultaneous output suitable for platform camera |
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| CN101179708A CN101179708A (en) | 2008-05-14 |
| CN101179708B true CN101179708B (en) | 2010-06-23 |
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| CN2007101500052A Expired - Fee Related CN101179708B (en) | 2007-10-31 | 2007-10-31 | Circuit of S video and compound video simultaneous output suitable for platform camera |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724517B (en) * | 2012-05-16 | 2014-06-04 | 浙江大华技术股份有限公司 | Method, device and system for video signal transmission, and terminals |
| CN205029788U (en) * | 2015-10-16 | 2016-02-10 | 杭州海康威视数字技术股份有限公司 | Signal transmission device, cloud platform and camera |
| US10855951B2 (en) * | 2018-07-13 | 2020-12-01 | Analog Devices Global Unlimited Company | Methods and devices for compensating sag effect |
| CN109510953B (en) * | 2018-11-29 | 2021-08-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Conversion circuit for converting S-separation video signal into composite video signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627616A (en) * | 1994-06-22 | 1997-05-06 | Philips Electronics North America Corporation | Surveillance camera system |
| CN1917581A (en) * | 2005-08-19 | 2007-02-21 | 三星电子株式会社 | Security camera |
| CN200962179Y (en) * | 2006-09-29 | 2007-10-17 | 陈素贤 | Full-direction rotating monitor pan/tilt |
-
2007
- 2007-10-31 CN CN2007101500052A patent/CN101179708B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627616A (en) * | 1994-06-22 | 1997-05-06 | Philips Electronics North America Corporation | Surveillance camera system |
| CN1917581A (en) * | 2005-08-19 | 2007-02-21 | 三星电子株式会社 | Security camera |
| CN200962179Y (en) * | 2006-09-29 | 2007-10-17 | 陈素贤 | Full-direction rotating monitor pan/tilt |
Non-Patent Citations (2)
| Title |
|---|
| JP昭56-164688A 1981.12.17 |
| JP特开平10-229511A 1998.08.25 |
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Denomination of invention: Circuit of S video and compound video simultaneous output suitable for platform camera Effective date of registration: 20120816 Granted publication date: 20100623 Pledgee: Bank of Shanghai Limited by Share Ltd Tianjin branch Pledgor: Tianjin Yaan Technology Co., Ltd. Registration number: 2012990000449 |
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Address after: 300384 in Tianjin Binhai Huayuan Industrial Zone (outer ring) eight Haitai Huake Road No. 6 Patentee after: TIANJIN YAAN TECHNOLOGY CO., LTD. Address before: 300384 Tianjin City Huayuan Industrial Zone Ziyuan Road No. 8 Patentee before: Tianjin Yaan Technology Co., Ltd. |
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