CN201878276U - Self-adaption video twisted-pair receiver - Google Patents
Self-adaption video twisted-pair receiver Download PDFInfo
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- CN201878276U CN201878276U CN2010206009295U CN201020600929U CN201878276U CN 201878276 U CN201878276 U CN 201878276U CN 2010206009295 U CN2010206009295 U CN 2010206009295U CN 201020600929 U CN201020600929 U CN 201020600929U CN 201878276 U CN201878276 U CN 201878276U
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Abstract
The utility model relates to a self-adaption video twisted-pair receiver. A video twisted-pair signal is input from a twisted-pair interface; a resistor R3 and a resistor R4 are the matched resistors of the twisted-pair; a suppression diode V1, a suppression diode V2, a suppression diode V3, a suppression diode V4, a resistor R1, and a resistor R2 input a secondary lightening protection circuit differential signal into a pin 2 and a pin 3 of a video operational amplifier chip IC 3; a pin 6 and a pin 7 of the video operational amplifier chip IC 3 are respectively the power supply inputs of plus 5V and minus 5V; a capacitor C2 and a capacitor C3 are decoupling capacitors of the power supply; a resistor R5, a resistor R9, a resistor R12, a resistor R6, a capacitor C12, a capacitor C13 and a capacitor C14 are 300-meter fixed gain amplification circuit; a single end signal is output by a pin 8 of the video operational amplifier chip IC 3 and input to a pin 14 of a self-adaption equalizer IC2 by a capacitor5; and the MAX7474 self-adaption equalizer IC2 is used for recovering the loss of the composite video signal in transmission in the twisted-pair cable. The self-adaption video twisted-pair receiver has the characteristics that the transmission distance is long, and the transmission quality is high, the brightness, color and the instantaneity of the original image are kept, the anti-interference capability is strong, the common-mode interference can be effectively restrained, different signals do not interfere with each other, and a three-level lighting protection is adopted, so that the damage due to lightning stroke is effectively avoided.
Description
Technical field
The utility model 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 is subjected to 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
In view of the deficiency that prior art exists, the utility model provides a kind of adaptive video twisted-pair feeder receiver.This receiver uses five classes or the above unshielded twisted pair of five classes as transmission medium, can receive the baseband video signal of colour or standards such as monochromatic PAL, NTSC, SECAM in real time.
The utility model for achieving the above object, the technical scheme of being taked is: a kind of 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 of 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, the end and the ground that suppress diode V3, resistance R 3, the other end of resistance R 4 connects 1 pin and 3 pin and the resistance R 1 of gas discharge tube V1 respectively, one end of resistance R 2, another termination of resistance R 1 suppresses the other end of diode V2, suppress the end of diode V4 and 2 pin of video amplifier chip IC 3, another termination of resistance R 2 suppresses the other end of diode V3, suppress the other end of 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 by resistance R 5,4 pin ground connection of video amplifier chip IC 3,7 pin connect power-and pass through capacitor C 2 ground connection, 6 pin connect electric capacity just also by 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 by capacitor C 6 ground connection, 11 pin, 12 pin are just connecing power supply by resistance R 7,15 pin are by 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 by resistance R 10,1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply, another road is by capacitor C 9 ground connection, 4 pin one tunnel connect power-, another road is by capacitor C 11 ground connection, 5 pin ground connection, 6 pin connect 1 mouthful of Q9 seat BNC by resistance R 13,2 mouthfuls of ground connection of Q9 seat BNC, 7 pin of vision signal conditioner IC5 are just connecing power supply, 8 pin are by 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 by capacitor C 12, capacitor C 13, capacitor C 14 ground connection.
Characteristics of the present utility model 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 different signals respectively, can not disturb each other.Adopt 3 grades of lightning protection circuits, effectively avoid thunderbolt to damage;
One 5 class UTP twisted-pair feeder can transmit 4 tunnel vision signals, but also transmission of one line vision signal, one tunnel control signal and power supply, the trouble of having avoided various signal independent wiring to bring has reduced project cost;
Can compensate automatically 300 meters to 1200 meters cable attenuations, need not to adjust.Have 2 rank low pass filters with the inhibition zone external noise.Intrinsic 60dB 50/60Hz input suppresses.Automatic gain control.Output 1Vp-p is the normal video level.
Description of drawings
Fig. 1 is the utility model acceptor circuit schematic diagram.
Fig. 2 the utility model receiver power supply circuit diagram.
Fig. 3 is the utility model transmitter circuit schematic diagram.
Fig. 4 the utility model transmitter power circuit diagram.
Embodiment
As 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 of 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, the end and the ground that suppress diode V3, resistance R 3, the other end of resistance R 4 connects 1 pin and 3 pin and the resistance R 1 of gas discharge tube V1 respectively, one end of resistance R 2, another termination of resistance R 1 suppresses the other end of diode V2, suppress the end of diode V4 and 2 pin of video amplifier chip IC 3, another termination of resistance R 2 suppresses the other end of diode V3, suppress the other end of 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 by resistance R 5,4 pin ground connection of video amplifier chip IC 3,7 pin connect power-and pass through capacitor C 2 ground connection, 6 pin connect electric capacity just also by 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 by capacitor C 6 ground connection, 11 pin, 12 pin are just connecing power supply by resistance R 7,15 pin are by 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 by resistance R 10,1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply, another road is by capacitor C 9 ground connection, 4 pin one tunnel connect power-, another road is by capacitor C 11 ground connection, 5 pin ground connection, 6 pin connect 1 mouthful of Q9 seat BNC by resistance R 13,2 mouthfuls of ground connection of Q9 seat BNC, 7 pin of vision signal conditioner IC5 are just connecing power supply, 8 pin are by 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 by 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 at 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.Now be output as single-ended signal because of video amplifier chip IC 3.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.Output signal is given Q9 seat BNC through resistance R 13, the vision signal after the output compensation.
Shown in Fig. 3,4, 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 utility model the key technical indexes 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 of 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, the end and the ground that suppress diode V3, resistance R 3, the other end of resistance R 4 connects 1 pin and 3 pin and the resistance R 1 of gas discharge tube V1 respectively, one end of resistance R 2, another termination of resistance R 1 suppresses the other end of diode V2, suppress the end of diode V4 and 2 pin of video amplifier chip IC 3, another termination of resistance R 2 suppresses the other end of diode V3, suppress the other end of 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 by resistance R 5,4 pin ground connection of video amplifier chip IC 3,7 pin connect power-and pass through capacitor C 2 ground connection, 6 pin connect electric capacity just also by 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 by capacitor C 6 ground connection, 11 pin, 12 pin are just connecing power supply by resistance R 7,15 pin are by 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 by resistance R 10,1 pin one tunnel of vision signal conditioner IC5 is just connecing power supply, another road is by capacitor C 9 ground connection, 4 pin one tunnel connect power-, another road is by capacitor C 11 ground connection, 5 pin ground connection, 6 pin connect 1 mouthful of Q9 seat BNC by resistance R 13,2 mouthfuls of ground connection of Q9 seat BNC, 7 pin of vision signal conditioner IC5 are just connecing power supply, 8 pin are by 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 by capacitor C 12, capacitor C 13, capacitor C 14 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206009295U CN201878276U (en) | 2010-11-11 | 2010-11-11 | Self-adaption video twisted-pair receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206009295U CN201878276U (en) | 2010-11-11 | 2010-11-11 | Self-adaption video twisted-pair receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878276U true CN201878276U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206009295U Expired - Lifetime CN201878276U (en) | 2010-11-11 | 2010-11-11 | Self-adaption video twisted-pair receiver |
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| Country | Link |
|---|---|
| CN (1) | CN201878276U (en) |
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2010
- 2010-11-11 CN CN2010206009295U patent/CN201878276U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHONGHUAN SYSTEM ENGINEERING LLC, TIANJIN CITY Free format text: FORMER OWNER: TIANJIN INST. OF TV TECHNOLOGY Effective date: 20120320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 300191 NANKAI, TIANJIN TO: 300060 HEXI, TIANJIN |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120320 Address after: 300060 Tianjin city Hexi District North Lake Road No. 9 Patentee after: Zhonghuan System Engineering LLC, Tianjin City Address before: 300191 No. 23, rehabilitation Road, Tianjin, Nankai District Patentee before: Tianjin Institute of TV Technology |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |