CN201813489U - Camera video image transmission circuit - Google Patents
Camera video image transmission circuit Download PDFInfo
- Publication number
- CN201813489U CN201813489U CN2010205692824U CN201020569282U CN201813489U CN 201813489 U CN201813489 U CN 201813489U CN 2010205692824 U CN2010205692824 U CN 2010205692824U CN 201020569282 U CN201020569282 U CN 201020569282U CN 201813489 U CN201813489 U CN 201813489U
- Authority
- CN
- China
- Prior art keywords
- circuit
- video signal
- operational amplifier
- twisted
- operational
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model provides a camera video image transmission circuit, which comprises a video signal output circuit and a video signal input circuit. A video signal input end of the video signal output circuit is connected with a twisted pair output end after being connected with a first operational amplification circuit and a second operational amplification circuit in parallel; and a twisted pair input end of the video signal input circuit is connected with a video signal output end after being connected with a third operational amplification circuit and a fourth operational amplification circuit in series. The camera video image transmission circuit adopts twisted pair cables for video signal transmission, is provided with a video transmission circuit, can amplify video signals through an operational amplifier, can meet the requirements of long-distance video signal transmission, and has good anti-interference performance; and the twisted pair cables comprises a plurality of pairs of twisted wires, and each pair of twisted wires can be connected with a monitoring camera, thus the occupied space is greatly reduced, wiring can be carried out easily, and the cost of equipment engineering installation is greatly decreased.
Description
Technical field
The utility model relates to a kind of camera circuitry of protection and monitor field, relates in particular to a kind of camera video image transmission circuit.
Background technology
The main sensing element of rig camera is CCD, it has characteristics such as highly sensitive, little, life-span length of distortion, anti-vibration, diamagnetic field, volume are little, no ghost, CCD is the abbreviation of charge coupled device (Charge CoupleDevice), it can become light electric charge also can be with Charge Storage and transfer, also can voltage be changed the electric charge taking-up of storage, be desirable imaging apparatus therefore.The operation principle of CCD is: the subject reflection ray, propagate into camera lens, through lens focus to the CCD chip, CCD gathers corresponding charge according to the power of light, through periodic discharge, produce the signal of telecommunication of expression one width of cloth width of cloth picture,, export the composite video signal of a standard by the lead-out terminal of rig camera through filtering, processing and amplifying.
Traditional vision signal is connected to monitor by coaxial cable, because that coaxial cable has a cable is long more, and the defective that signal attenuation is big more, so its transmission range is restricted always.When a monitor connected many rig cameras, every rig camera adopted a coaxial cable, not only increases cost, and takies bigger space, is difficult for wiring, coaxial interference phenomenon can occur in addition.Because the alternating electromagnetic field of the outside objective reality of coaxial cable, can on cable outer conductor, produce and disturb induced current, disturb induced current on cable longitudinal electrical resistance (impedance) Rd, can form and disturb induced electromotive force (voltage) Vi, disturb induced electromotive force just to be connected in the video signal transmission loop, be added on the end load Rh with vision signal, formed interference, Here it is, and coaxial interference forms principle.There is the defective of coaxial interference in coaxial cable, makes the vision signal that receives be subjected to influence in various degree, and severe patient can cause not seeing fully video image.
The utility model content
The technical problems to be solved in the utility model is in order to overcome technological deficiency recited above, a kind of camera video image transmission circuit to be provided.
In order to solve technical problem recited above, the utility model is taked following technical scheme:
The utility model provides a kind of camera video image transmission circuit, include video signal output circuit and video signal input circuit, described video signal output circuit is that video signal input terminal is connected to the twisted-pair feeder output behind first operational amplification circuit in parallel and second operational amplification circuit; To be the twisted-pair feeder input be connected to VT to described video signal input circuit behind the 3rd operational amplification circuit of series connection and the 4th operational amplification circuit.
Described first operational amplification circuit is the homophase operational amplification circuit.
Described second operational amplification circuit, the 3rd operational amplification circuit and the 4th operational amplification circuit are anti-phase operational amplification circuit.
In the video signal output circuit, video signal input terminal connects the normal phase input end of first operational amplifier, and the reverse inter-input-ing ending grounding of first operational amplifier, output connect twisted-pair feeder output a end, power access end connects positive voltage; Video signal input terminal connects the inverting input of second operational amplifier, and the positive input end grounding of second operational amplifier, output connect twisted-pair feeder output b end, power access end connects negative voltage.
Described first operational amplifier and second operational amplifier are high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz.
In the video signal input circuit, twisted-pair feeder input a end connects the inverting input of the 3rd operational amplifier, twisted-pair feeder input b end connects the normal phase input end of the 3rd operational amplifier, and the positive input end grounding of the 3rd operational amplifier, power connector end connection positive voltage, output connect the inverting input of four-operational amplifier; The positive input ground connection of four-operational amplifier, output connect VT, power access end connects negative voltage.
Described the 3rd operational amplifier and four-operational amplifier are high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz.
Twisted-pair feeder (Twisted Pair wire) is made up of two copper conductors with insulating protective layer; two copper conductors that thoroughly do away with edge are twisted together mutually by certain density; can reduce the degree that signal disturbs, the electric wave that the electric wave of each root lead radiation in transmission can be sent on other single line is offset.If many twisted-pair feeder is placed in the insulating sleeve just become twisted-pair cable.Twisted-pair cable has the following advantages:
(1) wiring is convenient, cable utilance height.Twisted-pair cable is appointed to get and a pair ofly just can be transmitted one tunnel vision signal, owing to have a plurality of twisted-pair feeders right in a cable, each twisted-pair feeder can alleviate the difficulty of cable wiring manufacture greatly to transmitting 1 road video image.1 couple in other 4 pairs of twisted-pair feeders transmits vision signal, remaining can also transmitting audio signal, control signal, power supply etc., improved the utilance of cable, the trouble of having avoided various signal independent wiring to bring, reduced project cost, overcome the coaxial cable difficult wiring, taken the many shortcomings of conduit resource, made the kind of comprehensive wiring more become unitized.
(2) antijamming capability is strong.Twisted-pair feeder can suppress common mode disturbances effectively, even under strong interference environment, twisted-pair feeder also can transmit fabulous picture signal.
(3) reliability height, equipment cost are low, easy to use.Utilize twisted-pair line transmission video signal, will insert dedicated transmitter, will insert special receiver in control centre at front end.This twisted-pair feeder transmission equipment low price uses simply working stability.
(4) real-time Transmission, immediately monitoring.What the picture signal that twisted-pair feeder transmits adopted is the analog signal technology, has guaranteed the real-time of supervisory control system, can monitor on-the-spot image in real time in the control room.
The utility model carries out the mode of video signal transmission by adopting twisted-pair cable, and design video transmission circuit amplifies vision signal by operational amplifier, can satisfy remote video signal transmission, and anti-interference is stronger; The while twisted-pair cable has many to twisted-pair feeder, and every pair of twisted-pair feeder can connect a rig camera, has not only significantly reduced its occupation space, is easy to wiring, and greatly reduces the plant engineering installation cost.
Description of drawings
Fig. 1 is video signal output circuit figure of the present utility model.
Fig. 2 is video signal input circuit figure of the present utility model.
Embodiment
Camera video image transmission circuit includes 1 video signal output circuit of figure and the video signal input circuit of Fig. 2, and to be video signal input terminal RCA IN be connected to twisted-pair feeder output TW-P OUT to video signal output circuit behind first operational amplification circuit 1 of parallel connection and second operational amplification circuit 2; To be twisted-pair feeder input TW-P IN be connected to VT RCA OUT to video signal input circuit behind the 3rd operational amplification circuit 3 of series connection and the 4th operational amplification circuit 4.First operational amplification circuit is the homophase operational amplification circuit, and second operational amplification circuit, the 3rd operational amplification circuit and the 4th operational amplification circuit are anti-phase operational amplification circuit.
See also Fig. 1, as shown in the figure, in the video signal output circuit, video signal input terminal RCA IN is through resistance R 11 ground connection, video signal input terminal RCA IN connects the normal phase input end of the first operational amplifier OP-amp1, the inverting input of the first operational amplifier OP-amp1 is through resistance 13 ground connection, its output connects twisted-pair feeder output a end through resistance R 10, be connected with resistance R 12 between its output and the inverting input, its power access end connects positive voltage+U, this positive voltage+U is+5V voltage that its power access end connects capacitor C 4 back ground connection; Video signal input terminal RCA IN connects the inverting input of the second operational amplifier OP-amp2 through resistance R 15, the positive input end grounding of the second operational amplifier OP-amp2, its output are through connecting twisted-pair feeder output b end, be connected with resistance R 14 between its output and the inverting input, its power access end connects negative voltage-U, its power access end connects capacitor C 5 back ground connection, and this negative voltage-U is-5V voltage.Among the figure, the first operational amplifier OP-amp1 and the second operational amplifier OP-amp2 all adopt high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz; The resistance of resistance R 12, R13 and R14 is 3K Ω, and resistance R 10 is 50 Ω with the resistance of R16, and the resistance of resistance R 11 is 75 Ω, and the resistance of resistance R 15 is 1.5K Ω; Capacitor C 4 is 0.1uF﹠amp with the amount of capacity of capacitor C 5; 4.7uF.
See also Fig. 2, as shown in the figure, in the video signal input circuit, be connected with resistance R 7 between twisted-pair feeder input a end and the b end, twisted-pair feeder input a connects the inverting input of the 3rd operational amplifier OP-amp3 through resistance R 8, twisted-pair feeder input b end connects the normal phase input end of the 3rd operational amplifier OP-amp3 through resistance R 6, the normal phase input end of the 3rd operational amplifier OP-amp3 is through resistance R 5 ground connection, power connector end connects positive voltage+U, this positive voltage+U is+5V voltage, its power access end connects capacitor C 3 back ground connection, be connected with resistance R 9 between its output and the inverting input, its output through RC circuit C2 and R3 and with RC circuit parallel resistor R4 after be connected the inverting input of four-operational amplifier OP-amp4; The positive input ground connection of four-operational amplifier OP-amp4, output are connected with resistance R 2 between resistance R 1 connection VT RCA OUT, its output and inverting input, power access end connects negative voltage, its power access end connects capacitor C 1 back ground connection, and this negative voltage-U is-5V voltage.Among the figure, the 3rd operational amplifier and four-operational amplifier all adopt high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz; The resistance of resistance R 1 is 75 Ω, and the resistance of resistance R 2, R4, R5, R6, R8, R9 is 3K Ω, and the resistance of resistance R 7 is 100 Ω; Capacitor C 1 is 0.1uF﹠amp with the amount of capacity of C3; 4.7uF.
Claims (7)
1. camera video image transmission circuit, include video signal output circuit and video signal input circuit, it is characterized in that: described video signal output circuit is that video signal input terminal is connected to the twisted-pair feeder output behind first operational amplification circuit in parallel and second operational amplification circuit; To be the twisted-pair feeder input be connected to VT to described video signal input circuit behind the 3rd operational amplification circuit of series connection and the 4th operational amplification circuit.
2. camera video image transmission circuit as claimed in claim 1 is characterized in that: described first operational amplification circuit is the homophase operational amplification circuit.
3. camera video image transmission circuit as claimed in claim 1 is characterized in that: described second operational amplification circuit, the 3rd operational amplification circuit and the 4th operational amplification circuit are anti-phase operational amplification circuit.
4. camera video image transmission circuit as claimed in claim 1, it is characterized in that: in the video signal output circuit, video signal input terminal connects the normal phase input end of first operational amplifier, and the reverse inter-input-ing ending grounding of first operational amplifier, output connect twisted-pair feeder output a end, power access end connects positive voltage; Video signal input terminal connects the inverting input of second operational amplifier, and the positive input end grounding of second operational amplifier, output connect twisted-pair feeder output b end, power access end connects negative voltage.
5. camera video transmission circuit as claimed in claim 4, it is characterized in that: described first operational amplifier and second operational amplifier are high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz.
6. camera video transmission circuit as claimed in claim 1, it is characterized in that: in the video signal input circuit, twisted-pair feeder input a end connects the inverting input of the 3rd operational amplifier, twisted-pair feeder input b end connects the normal phase input end of the 3rd operational amplifier, and the positive input end grounding of the 3rd operational amplifier, power connector end connection positive voltage, output connect the inverting input of four-operational amplifier; The positive input ground connection of four-operational amplifier, output connect VT, power access end connects negative voltage.
7. camera video transmission circuit as claimed in claim 6, it is characterized in that: described the 3rd operational amplifier and four-operational amplifier are high-speed operational amplifier, and the conversion rate SR of high speed operation amplifier is that 50～70V/us, unity gain bandwidth BWG are greater than 20MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205692824U CN201813489U (en) | 2010-10-19 | 2010-10-19 | Camera video image transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205692824U CN201813489U (en) | 2010-10-19 | 2010-10-19 | Camera video image transmission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201813489U true CN201813489U (en) | 2011-04-27 |
Family
ID=43896424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205692824U Expired - Fee Related CN201813489U (en) | 2010-10-19 | 2010-10-19 | Camera video image transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201813489U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967831A (en) * | 2015-07-24 | 2015-10-07 | 金钱猫科技股份有限公司 | Coaxial-cable video monitoring transmission system |
-
2010
- 2010-10-19 CN CN2010205692824U patent/CN201813489U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967831A (en) * | 2015-07-24 | 2015-10-07 | 金钱猫科技股份有限公司 | Coaxial-cable video monitoring transmission system |
| CN104967831B (en) * | 2015-07-24 | 2018-02-16 | 金钱猫科技股份有限公司 | A kind of coaxial video monitors Transmission system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102186073A (en) | HD-SDI (High Definition-Serial Digital Interface) video signal transmission system and method in high-speed dome camera | |
| CN201813489U (en) | Camera video image transmission circuit | |
| CN206948488U (en) | A kind of passive high-definition video signal paired line transmission device | |
| CN103325484B (en) | Digital video cable suitable for unmanned plane optoelectronic system | |
| CN102075216B (en) | System for isolating and coupling power line communication signals | |
| CN202075963U (en) | Display device combining communication and transmission of power line | |
| CN104779975A (en) | A differential coupling communication device of high speed power line carrier system | |
| CN203261418U (en) | Ethernet coaxial cable converter | |
| CN201928374U (en) | Camera | |
| CN201414251Y (en) | Signal transmission device of LED control system | |
| CN203563091U (en) | An Ethernet switch with an EoC port | |
| CN206115239U (en) | Anti -interference control system is used to MVR technology | |
| CN201821452U (en) | POE network high-speed intelligent spherical camera | |
| CN103326249A (en) | Multi-function power box for surveillance camera | |
| CN209994724U (en) | Novel long-line transmission system for weak signal acquisition and transmission | |
| CN203618086U (en) | Video signal transmission system based on twisted pairs | |
| CN202145641U (en) | Photoelectric isolator | |
| CN206865632U (en) | Video transmitter | |
| CN209593616U (en) | Twisted-pair cable video transmission system | |
| CN209805507U (en) | Automatic processing system | |
| CN213458432U (en) | Anti-interference structure of infrared communication | |
| CN201601672U (en) | Radio-frequency digital signal transmission system and radio-frequency digital signal access device | |
| CN210246899U (en) | 16-path passive high-definition video twisted-pair transmitter | |
| CN211930736U (en) | Split type binocular camera and automatic driving system | |
| CN207099224U (en) | Insulating power supply video transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| C56 | Change in the name or address of the patentee | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zheng Renchang Inventor after: Sun Jingqun Inventor after: Wu Xingwen Inventor before: Zheng Renchang Inventor before: Sun Jingqun Inventor before: Wu Xingwen |
|
| CP03 | Change of name, title or address |
Address after: 518129, A, building 11, 1-2 Xin'an street, five middle road, Bantian street, Longgang District, Guangdong, Shenzhen, China Patentee after: Shenzhen Dongri Xinbo Technology Co.,Ltd. Address before: 518129 No. 11, Xin'an street, five middle road, Buji Town, Shenzhen, Guangdong, Bantian Patentee before: Shenzhen EEP Industry Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20151019 |
|
| EXPY | Termination of patent right or utility model |