CN101977298B - Adaptive video twisted-pair receiver - Google Patents
Adaptive video twisted-pair receiver Download PDFInfo
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- CN101977298B CN101977298B CN201010539208A CN201010539208A CN101977298B CN 101977298 B CN101977298 B CN 101977298B CN 201010539208 A CN201010539208 A CN 201010539208A CN 201010539208 A CN201010539208 A CN 201010539208A CN 101977298 B CN101977298 B CN 101977298B
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Abstract
The invention relates to an adaptive video twisted-pair receiver. A video twisted-pair signal is input from a twisted-pair interface J1 and resistors R3 and R4 are twisted-pair matched resistors. Pins 2 and 3 for inputting a level-2 lightning protection circuit differential signal into a video amplification chip IC3 are suppression diodes V1, V2, V3 and V4 and resistors R1 and R2, and pins 6 and 7 are used for inputting a +5V power supply and a -5V power supply. Capacitors C2 and C3 are power supply decoupling resistors. Resistors R5, R9, R12 and R6 and capacitors C12, C13 and C14 are 300-meter fixed-gain amplification circuits. A single-ended signal is output by a pin 8 of the video amplification chip IC3 and is input to a pin 14 of an adaptive equalizer IC2 through a capacitor C5. The MAX7474 adaptive equalizer IC2 is used for restoring loss of a composite video signal in twisted-pair cable transmission. The adaptive video twisted-pair receiver has the characteristics of long transmission distance and high transmission quality. The brightness, colour and real-time property of the original image are kept. The anti-jamming capability is strong. Common mode interference can be effectively inhibited, so that different signals cannot interfere with one another. Due to the adoption of a level-3 lightning protection circuit, lightning damage can be effectively avoided.
Description
Technical field
The present invention relates to a kind of adaptive video twisted-pair feeder receiver that is used for security protection/video monitoring system.
Background technology
In whole security protection/video monitoring system, the transmission of video image is crucial link.Being used for the medium of images signal mainly contains coaxial cable, optical fiber and twisted-pair feeder.Because the coaxial cable self characteristics, its decay that receives is relevant with the frequency of transmission range and signal itself when vision signal is transmitted in coaxial cable.When vision signal is transmitted in coaxial cable not only the signal overall magnitude decayed, and each frequency component attenuation differs greatly, the color maximum that partly decays particularly, so coaxial cable only is suitable for the video of about 300 meters of transmission ranges.Optical fiber uses in order to solve remote video signal transmission.Because optical fiber integrally transmission system price is too high, optical fibre installation, connection need Special Equipment, and the Installation and Debugging difficulty; The fault difficulty is looked for; Damage not defectives such as easy-maintaining, for 2000 meters for interior closely video transmission, optical fiber is not one and well selects.In the security monitoring market of China, transmission range is 60% 300 meters to 600 meters occupation rate of market, and transmission range is that occupation rate is 10% more than 30%, 1200 meter 600 meters to 1200 meters occupation rate of market.
Summary of the invention
Deficiency in view of prior art exists the invention provides a kind of adaptive video twisted-pair feeder receiver.This receiver uses that unshielded twisted pair can receive the baseband video signal of standards such as colour or monochromatic PAL, NTSC, SECAM in real time as transmission medium more than five types or five types.
The present invention is for realizing above-mentioned purpose, and the technical scheme of being taked is: a kind of adaptive video twisted-pair feeder receiver is characterized in that: the circuit of this receiver is connected to: 3 mouthfuls of ground connection of twisted-pair feeder interface J1,2 mouthfuls, 1 mouthful 1 pin and 3 pin that meet gas discharge tube V1 respectively; The 2 pin connecting resistance R3 of gas discharge tube V1, resistance R 4 one ends and inhibition diode V2, an end that suppresses diode V3 and ground, 1 pin of another termination gas discharge tube V1 of resistance R 3, an end of resistance R 1,3 pin of another termination gas discharge tube V1 of resistance R 4, an end of resistance R 2; Another termination of resistance R 1 suppresses the other end of diode V2, an end that suppresses diode V4 and 2 pin of video amplifier chip IC 3, and another termination of resistance R 2 suppresses the other end of diode V3, the other end that suppresses diode V4 and 3 pin of video amplifier chip IC 3, and 1 pin of video amplifier chip 1C3 connects 8 pin of video amplifier chip IC 3 and an end of capacitor C 5 through resistance R 5; 4 pin ground connection of video amplifier chip IC 3; 7 pin connect power-and through capacitor C 2 ground connection, 6 pin connect power supply just also through capacitor C 3 ground connection, 14 pin of another termination adaptive equalizer IC2 of capacitor C 5; 1 pin of adaptive equalizer IC2,2 pin, 3 pin, 5 pin, 7 pin, 10 pin, 13 pin ground connection; 4 pin, 9 pin connect power supply just also through capacitor C 6 ground connection, and 11 pin, 12 pin are just connecing power supply through resistance R 7, and 15 pin are through capacitor C 4 ground connection; 8 pin are leaded up to capacitor C 10 and are connect 2 pin of vision signal conditioner IC5; Another road connects 3 pin and the ground of vision signal conditioner IC5 through resistance R 10, and 1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply, and another road is through capacitor C 9 ground connection; 4 pin one tunnel connect power-; Capacitor C 11 ground connection are passed through on another road, 5 pin ground connection, and 6 pin connect 1 mouthful of Q9 seat BNC through resistance R 13; 2 mouthfuls of ground connection of Q9 seat BNC; 7 pin of vision signal conditioner IC5 are just connecing power supply, and 8 pin are through the negative pole of resistance R 11 sending and receiving optical diode D1, and the positive pole of light-emitting diode D1 is just connecing power supply; One end of resistance R 9, resistance R 12, resistance R 6 links to each other and connects 1 pin of video amplifier chip IC 3, and the other end of resistance R 9, resistance R 12, resistance R 6 is respectively through capacitor C 12, capacitor C 13, capacitor C 14 ground connection.
Characteristics of the present invention are: long transmission distance, transmission quality height.It is poor to the decay and the decay between different frequency of video amplitude to have compensated twisted-pair feeder well, has kept brightness and the color and the real-time of original image;
Antijamming capability is strong.Can effectively suppress common mode disturbances, and use several in the cable that twisted-pair feeder is transmitted various signals respectively, can not disturb each other.Adopt 3 grades of lightning protection circuits, effectively avoid thunderbolt to damage;
5 types of UTP twisted-pair feeders can transmit 4 tunnel vision signals, but also transmission of one line vision signal, and one tunnel control signal and power supply have been avoided various signal independent wiring trouble caused, have reduced project cost;
Can compensate automatically 300 meters to 1200 meters cable attenuations, need not adjustment.Have 2 rank low pass filters to suppress out-of-band noise.Intrinsic 60dB 50/60Hz input suppresses.Automatic gain control.Output 1Vp-p is the normal video level.
Description of drawings
Fig. 1 is an acceptor circuit schematic diagram of the present invention.
Fig. 2 receiver power supply circuit diagram of the present invention.
Fig. 3 is a transmitter circuit schematic diagram of the present invention.
Fig. 4 transmitter power circuit diagram of the present invention.
Embodiment
Like Fig. 1, shown in 2, the circuit of adaptive video twisted-pair feeder receiver is connected to: 3 mouthfuls of ground connection of twisted-pair feeder interface J1,2 mouthfuls, 1 mouthful 1 pin and 3 pin that meet gas discharge tube V1 respectively, the 2 pin connecting resistance R3 of gas discharge tube V1, resistance R 4 one ends and inhibition diode V2, an end that suppresses diode V3 and ground; The other end of resistance R 3, resistance R 4 connects 1 pin and 3 pin and the resistance R 1 of gas discharge tube V1, an end of resistance R 2 respectively, and another termination of resistance R 1 suppresses the other end of diode V2, an end that suppresses diode V4 and 2 pin of video amplifier chip IC 3, and another termination of resistance R 2 suppresses the other end of diode V3, the other end that suppresses diode V4 and 3 pin of video amplifier chip IC 3; 1 pin of video amplifier chip 1C3 connects 8 pin of video amplifier chip IC 3 and an end of capacitor C 5 through resistance R 5,4 pin ground connection of video amplifier chip IC 3, and 7 pin connect power-and pass through capacitor C 2 ground connection; 6 pin connect electric capacity just also through capacitor C 3 ground connection; 14 pin of another termination adaptive equalizer IC2 of capacitor C 5,1 pin of adaptive equalizer IC2,2 pin, 3 pin, 5 pin, 7 pin, 10 pin, 13 pin ground connection, 4 pin, 9 pin connect power supply just also through capacitor C 6 ground connection; 11 pin, 12 pin are just connecing power supply through resistance R 7; 15 pin are through capacitor C 4 ground connection, and 8 pin are leaded up to capacitor C 10 and connect 2 pin of vision signal conditioner IC5, and another road connects 3 pin and the ground of vision signal conditioner IC5 through resistance R 10; 1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply; Another road is through capacitor C 9 ground connection, and 4 pin one tunnel connect power-, and another road is through capacitor C 11 ground connection; 5 pin ground connection; 6 pin connect 1 mouthful of Q9 seat BNC through resistance R 13,2 mouthfuls of ground connection of Q9 seat BNC, and 7 pin of vision signal conditioner IC5 are just connecing power supply; 8 pin are through the negative pole of resistance R 11 sending and receiving optical diode D1, and the positive pole of light-emitting diode D1 is just connecing power supply; One end of resistance R 9, resistance R 12, resistance R 6 links to each other and connects 1 pin of video amplifier chip IC 3, and the other end of resistance R 9, resistance R 12, resistance R 6 is respectively through capacitor C 12, capacitor C 13, capacitor C 14 ground connection.
Video twisted-pair feeder receiver principle: video twisted-pair cable signal is imported from twisted-pair feeder interface J1.Resistance R 3, R4 are the twisted-pair feeder build-out resistor.Suppressing diode V1, V2, V3, V4, resistance R 1, R2 is 2,3 pin that secondary lightning protection circuit differential signal is input to video amplifier chip IC 3,6,7 pin be+5V ,-the 5V power supply imports.Capacitor C 2, C3 are power supply coupling capacitor.Resistance R 5, R9, R12, R6, capacitor C 12, C13, C14 are 300 meters fixed gain amplifying circuits.And be output as single-ended signal by 8 pin of video amplifier chip IC 3.Input to 14 pin of adaptive equalizer IC2 through capacitor C 5.MAX7474 adaptive equalizer IC2 is used to recover the loss of composite video signal in the twisted-pair cable transmission.For the CVBS signal of tape burst signal, device can carry out adaptive equalization to cable length, is compatible with NTSC and PAL standard.1,2,3,5,10,13 pin of adaptive equalizer IC2 are power supply ground.4,9 pin are positive source.11,12 pin are the compensation selecting side.Through resistance R 7 resistance receive+5V, 14,15 is the difference input.Be output as single-ended signal because of video amplifier chip IC 3 at present.So 15 foot meridian capacitor C4 ground connection.8 pin are output.Give MAX7450 vision signal conditioner IC5 the 2nd pin through capacitor C 10.Vision signal conditioner IC5 is integrated with video case position device.Automatic gain control (AGC), synchronization loss (LOS) detector and out-of-band noise filter.Further improve input signal.VIDEO light-emitting diode D1 is the vision signal indicator light.The output signal is given Q9 seat BNC through resistance R 13, the vision signal after the output compensation.
Like Fig. 3, shown in 4, video twisted-pair feeder transmitter principle: the video coaxial cable signal is imported from Q9 seat BNC.Resistance R 1 is the coaxial cable build-out resistor.Be coupled to EL5171 video amplifier chip U4 the 2nd pin through capacitor C 1 and input to video amplifier chip U4, be transformed to differential signal output.Resistance R 8, R9 are the U4 feedback resistance, and it and resistance R 11, R13, R14, capacitor C 11, C12 constitute the video preprocessor compensating circuit jointly.Capacitor C 4, C5 are power supply coupling capacitor.Resistance R 4, R5, R6, R7, inhibition diode V1, V2, V3, V4 constitute the secondary lightning protection circuit jointly.Outputing to twisted-pair feeder through twisted-pair feeder interface J2 transmits.The power supply of this transmitter is DC12V, can with front-end camera common-battery source.12V is through power interface U1 output+5V burning voltage in input, and 12V gives the 1.2 pin input of power interface U2 simultaneously, and output transform is-the 5V burning voltage.POWER is a power supply indicator.Dual operational amplifier U3 and diode D5, D6, resistance R 3, R16, R17 constitute comparator circuit.The video input is coupled to comparator through capacitor C 8.Light-emitting diode D2 lamp is bright for incoming video signal is arranged, otherwise does not then have, and in order to judge the video input no signal is arranged.
The key technical indexes of the present invention can reach:
Input and output level: 1Vpp/75 Ω composite video signal, BNC connector;
Input and output impedance: non-equilibrium 75 Ω, balance 100 Ω;
Bandwidth: DC-5MHz; Signal to noise ratio: >=60dB;
Supply voltage: AC 220V 50Hz; Power consumption: 1W;
Environment for use temperature :-20 ℃-+60 ℃; Relative humidity: 0-90% (non-condensing);
Lightning protection ability: 5kV (10/7000us).
Claims (1)
1. adaptive video twisted-pair feeder receiver, it is characterized in that: the circuit of this receiver is connected to: 3 mouthfuls of ground connection of twisted-pair feeder interface J1,2 mouthfuls, 1 mouthful 1 pin and 3 pin that meet gas discharge tube V1 respectively, the 2 pin connecting resistance R3 of gas discharge tube V1, resistance R 4 one ends and suppress diode V2, suppress an end and the ground of diode V3; 1 pin of another termination gas discharge tube V1 of resistance R 3, an end of resistance R 1,3 pin of another termination gas discharge tube V1 of resistance R 4, an end of resistance R 2, another termination of resistance R 1 suppresses the other end of diode V2, an end that suppresses diode V4 and 2 pin of video amplifier chip IC 3; Another termination of resistance R 2 suppresses the other end of diode V3, the other end that suppresses diode V4 and 3 pin of video amplifier chip IC 3; 1 pin of video amplifier chip 1C3 connects 8 pin of video amplifier chip IC 3 and an end of capacitor C 5 through resistance R 5,4 pin ground connection of video amplifier chip IC 3, and 7 pin connect power-and pass through capacitor C 2 ground connection; 6 pin connect power supply just also through capacitor C 3 ground connection; 14 pin of another termination adaptive equalizer IC2 of capacitor C 5,1 pin of adaptive equalizer IC2,2 pin, 3 pin, 5 pin, 7 pin, 10 pin, 13 pin ground connection, 4 pin, 9 pin connect power supply just also through capacitor C 6 ground connection; 11 pin, 12 pin are just connecing power supply through resistance R 7; 15 pin are through capacitor C 4 ground connection, and 8 pin are leaded up to capacitor C 10 and connect 2 pin of vision signal conditioner IC5, and another road connects 3 pin and the ground of vision signal conditioner IC5 through resistance R 10; 1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply; Another road is through capacitor C 9 ground connection, and 4 pin one tunnel connect power-, and another road is through capacitor C 11 ground connection; 5 pin ground connection; 6 pin connect 1 mouthful of Q9 seat BNC through resistance R 13,2 mouthfuls of ground connection of Q9 seat BNC, and 7 pin of vision signal conditioner IC5 are just connecing power supply; 8 pin are through the negative pole of resistance R 11 sending and receiving optical diode D1, and the positive pole of light-emitting diode D1 is just connecing power supply; One end of resistance R 9, resistance R 12, resistance R 6 links to each other and connects 1 pin of video amplifier chip IC 3, and the other end of resistance R 9, resistance R 12, resistance R 6 is respectively through capacitor C 12, capacitor C 13, capacitor C 14 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010539208A CN101977298B (en) | 2010-11-11 | 2010-11-11 | Adaptive video twisted-pair receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010539208A CN101977298B (en) | 2010-11-11 | 2010-11-11 | Adaptive video twisted-pair receiver |
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| CN101977298A CN101977298A (en) | 2011-02-16 |
| CN101977298B true CN101977298B (en) | 2012-09-19 |
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| CN201010539208A Expired - Fee Related CN101977298B (en) | 2010-11-11 | 2010-11-11 | Adaptive video twisted-pair receiver |
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| CN109802748B (en) * | 2019-03-18 | 2023-08-25 | 延锋伟世通电子科技（上海）有限公司 | High-immunity differential camera signal processing circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114488A (en) * | 1994-08-04 | 1996-01-03 | 沈来沛 | Corrector for video transmission on wire and cable |
| US20020097105A1 (en) * | 2001-01-23 | 2002-07-25 | Adc Telecommunications, Inc. | Multi-circuit signal transformer |
| CN201260212Y (en) * | 2008-07-24 | 2009-06-17 | 汪艺鹰 | Automatically regulated and controlled twisted line transmitted video signal receiver |
| CN201374779Y (en) * | 2009-02-03 | 2009-12-30 | 厦门市振威安全技术发展有限公司 | Twisted pair video transmission system capable of automatically pre-amplifying and compensating |
| CN201388266Y (en) * | 2008-12-04 | 2010-01-20 | 深圳市优特普科技有限公司 | Realizing device for long-distance twisted-pair cable video transmission |
| CN101682792A (en) * | 2006-11-08 | 2010-03-24 | Rgb系统公司 | Method and apparatus for video transmission over long distances using twisted pair cables |
-
2010
- 2010-11-11 CN CN201010539208A patent/CN101977298B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114488A (en) * | 1994-08-04 | 1996-01-03 | 沈来沛 | Corrector for video transmission on wire and cable |
| US20020097105A1 (en) * | 2001-01-23 | 2002-07-25 | Adc Telecommunications, Inc. | Multi-circuit signal transformer |
| CN101682792A (en) * | 2006-11-08 | 2010-03-24 | Rgb系统公司 | Method and apparatus for video transmission over long distances using twisted pair cables |
| CN201260212Y (en) * | 2008-07-24 | 2009-06-17 | 汪艺鹰 | Automatically regulated and controlled twisted line transmitted video signal receiver |
| CN201388266Y (en) * | 2008-12-04 | 2010-01-20 | 深圳市优特普科技有限公司 | Realizing device for long-distance twisted-pair cable video transmission |
| CN201374779Y (en) * | 2009-02-03 | 2009-12-30 | 厦门市振威安全技术发展有限公司 | Twisted pair video transmission system capable of automatically pre-amplifying and compensating |
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| CN101977298A (en) | 2011-02-16 |
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