CN207677911U - The Transmission system of multi-channel video signal and audio signal - Google Patents
The Transmission system of multi-channel video signal and audio signal Download PDFInfo
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- CN207677911U CN207677911U CN201820031211.5U CN201820031211U CN207677911U CN 207677911 U CN207677911 U CN 207677911U CN 201820031211 U CN201820031211 U CN 201820031211U CN 207677911 U CN207677911 U CN 207677911U
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Abstract
The utility model discloses a kind of Transmission system of multi-channel video signal and audio signal, including transmission module, optical fiber and receiving module, and the optical transceiver of transmission module is connected with optical fiber wherein one end；The optical transceiver of the receiving module is connected with the optical fiber other end.The utility model can be transmitted multichannel sound, vision signal by optical fiber, distorted signals is small in transmission process, it is stable and reliable in work, real-time Transmission effect is good, further increase the function of system, business hall monitoring, warehouse monitoring, Automatic Teller Machine and self-help bank's monitoring etc. are can be widely applied to, application range light can better meet actual needs.
Description
Technical field
The utility model is related to the Transmission systems of a kind of multi-channel video signal and audio signal, belong to network and data communication
Field.
Background technology
In multimedia application system, sounds, the vision signals such as a DVI vision signals, VGA analog video signals are generally required
It is transmitted at a distance, when being solved using common cable long distance transmission using remote fiber transmission technology, it may appear that letter
Number difference, be easily disturbed, streaking phenomena such as, the problems such as occasions long distance transmission such as distribution of multimedia information cannot be met, with
And the digital video optical fiber transmission technique for improving domestic high quality has great theory significance and realistic meaning.
In recent years, the fast development of science and technology both at home and abroad, the acquisition of digital signal and optical fiber transmission technique are much being led
Domain is obtained for extensive promotion and application, as militarily target tracking system and it is non-military on field of traffic and building
Monitoring system in mansion is medium, and optical fiber relies on its broadband, the advantages that low decaying, stronger anti-interference ability so that in number
The big problem of data volume has obtained good solution during word video signal transmission, and therefore, optical fiber transmission technique is extensive
Applied in the Transmission system of digital video.Therefore, a kind of Transmission system of multi-channel video signal and audio signal is designed, it appears
It is meaningful.
Invention content
The purpose of this utility model is exactly to be regarded to solve the above problem of the existing technology to provide a kind of multichannel
The Transmission system of frequency signal and audio signal further increases the function of system, improves job stability, enhancing real-time Transmission effect
Fruit.
The technical solution of the utility model is：A kind of Transmission system of multi-channel video signal and audio signal, including
Transmission module, optical fiber and receiving module, transmission module include each road camera, each road microphone, A/D conversion circuits, system master
Control core FPGA, parallel-to-serial converter and optical transceiver, each road camera and Ge Lu microphones by A/D conversion circuits with
The input terminal of system master core FPGA is connected, the input terminal of the output end parallel-to-serial converter of the system master core FPGA
It is connected, the output end of parallel-to-serial converter is connected with optical transceiver, and the optical transceiver is connected with optical fiber wherein one end；It is described
Receiving module includes each road VGA, each road microphone, D/A conversion circuits, system master core FPGA, serial parallel converter and light
Transceiver, each road VGA and Ge Lu microphones are connected by D/A conversion circuits with the output end of system master core FPGA
It connects, the output end of the input terminal deserializer of the system master core FPGA is connected, the input of the parallel-to-serial converter
End is connected with optical transceiver, and the optical transceiver is connected with the optical fiber other end.
Further, the Transmission system of above-mentioned multi-channel video signal and audio signal, wherein：Each road camera and A/
Between D conversion circuits, adjustment circuit is equipped between each road VGA and D/A conversion circuits, the adjustment circuit includes video amplifier electricity
Road, clamp circuit and filter circuit.
Further, the Transmission system of above-mentioned multi-channel video signal and audio signal, wherein：The filter circuit includes electricity
Hinder R6, resistance R7, inductance L1, inductance L2, inductance L3, capacitance C7, capacitance C8, capacitance C9 and capacitance C10, resistance R6, inductance L1,
Inductance L2, inductance L3 are sequentially connected in series between circuit input port and delivery outlet, and the one end capacitance C7 is connected to resistance R6 and inductance L1
Between, the one end capacitance C8 is connected between inductance L1 and inductance L2, and the one end capacitance C9 is connected between inductance L2 and inductance L3, electricity
Hold C10 one end to be connected between inductance L3 and inductance L delivery outlets, capacitance C7, capacitance C8, capacitance C9 and capacitance C1 another termination
Ground, the one end resistance R7 are connected with delivery outlet, other end ground connection.
Further, the Transmission system of above-mentioned multi-channel video signal and audio signal, wherein：The A/D of the vision signal
Conversion circuit is realized using modulus conversion chip ADC9280 chips and its peripheral circuit；The video d/a conversion circuit uses
DA9708 chips and its peripheral circuit are realized.
The A/D circuits of the audio signal are realized using CS5340 chips and its peripheral circuit；The D/A of the audio signal
Conversion is realized using CS4344 chips and its peripheral circuit
This law is bright also disclose a kind of multi-channel video signal and audio signal Transmission system control method, including it is following
Step：
（1）In transmitting terminal, by each road camera acquisition to analog video signal be adjusted circuit and A/D is converted into counting
Word signal, meanwhile, the collected audio signal of each road microphone is converted into digital signal by amplification, filtering, A/D；（2）
Under the control of sampling clock, digital video and audio signal are sent into system master core FPGA and are time-multiplexed；（3）It will answer
Signal is sent into parallel-serial conversion chip and carries out parallel-serial conversion, and the signal after concatenation is sent to through optical transceiver on optical fiber；（4）
The optical signal sent in optical fiber is converted into electric signal by receiving terminal, optical transceiver, and serioparallel exchange is carried out by deserializer；
（5）The parallel signal of conversion is converted into each road video and the roads Ge Lu audio through system master core FPGA；（6）Digital sound,
Vision signal carries out D/A conversions, and digital sound, vision signal are become original analog audio, vision signal by adjusted circuit again.
The utility model is outstanding to be had the technical effect that：The utility model can pass through multichannel sound, vision signal
Optical fiber transmits, and distorted signals is small in transmission process, and stable and reliable in work, real-time Transmission effect is good, further increases the work(of system
Can, it can be widely applied to business hall monitoring, warehouse monitoring, Automatic Teller Machine and self-help bank's monitoring etc., application range light, energy
Better meet actual needs.
Description of the drawings
Fig. 1 is the utility model multi-channel video signal and the Transmission system schematic diagram of audio signal；
Fig. 2 is filter circuit schematic diagram.
Specific implementation mode
Below by way of attached drawing combination specific implementation mode, the utility model is described in further details.
As shown in Figure 1, the Transmission system of the utility model multi-channel video signal and audio signal includes transmission module, optical fiber
And receiving module, transmission module include each road camera, each road microphone, A/D conversion circuits, system master core FPGA, simultaneously
String converter and optical transceiver, each road camera and Ge Lu microphones pass through A/D conversion circuits and system master core
The input terminal of FPGA is connected, and the input terminal of the output end parallel-to-serial converter of the system master core FPGA is connected, and goes here and there
The output end of converter is connected with optical transceiver, and the optical transceiver is connected with optical fiber wherein one end；The receiving module packet
The roads Kuo Ge VGA, each road microphone, D/A conversion circuits, system master core FPGA, serial parallel converter and optical transceiver are described
Each road VGA and Ge Lu microphones are connected by D/A conversion circuits with the output end of system master core FPGA, the system
The output end of the input terminal deserializer of master control core FPGA is connected, the input terminal and optical transceiver of the parallel-to-serial converter
It is connected, the optical transceiver is connected with the optical fiber other end.
Between each road camera and A/D conversion circuits, adjustment circuit is equipped between each road VGA and D/A conversion circuits,
Adjustment circuit includes video amplifier circuit, clamp circuit and filter circuit, the analog video signal of amplification input before A/D is converted
Its voltage magnitude is set to meet the input voltage range of analog-digital converter to improve A/D conversion accuracy.
Amplifying circuit realizes that specific peripheral circuit can refer to the chip of EL5166 by EL5166 and its associated peripheral circuits
Handbook belongs to the prior art, and which is not described herein again.The synchronous letter of row is further comprised in vision signal other than comprising picture signal
Number, horizontal blanking signal, field sync signal, field blanking signal and serrated pulse signal, leading Eq pulse, post-equalizing pulse etc..Cause
This, to the logical relation being acquired between vision signal just must accurately holding various signals.Specific clamp circuit is logical
It crosses LM1881 chips and its peripheral circuit is realized, LM1881 chips are National Semiconductor's production for TV signal
Video Sync Separator Chip it be row field sync signal separation application-specific integrated circuit can extract composite video row synchronize
Field synchronization clock information.
The frequency range of the correlation standard vision signal of Chinese TV is 0.6MHz.Therefore low-pass filter is used
LPF can make the signal within the scope of video frequency band pass through inhibition, and other avoid sampling with the interference of outer high-frequency signal and noise signal
The aliasing of signal spectrum afterwards.Circuit selects seven rank Chebyshev type low-pass filters, and cutoff frequency is set as 6MHz.
Physical circuit as shown in Fig. 2, low-pass filter circuit include resistance R6, resistance R7, inductance L1, inductance L2, inductance L3,
Capacitance C7, capacitance C8, capacitance C9 and capacitance C10, resistance R6, inductance L1, inductance L2, inductance L3 are sequentially connected in series in circuit input port
Between delivery outlet, the one end capacitance C7 is connected between resistance R6 and inductance L1, and the one end capacitance C8 is connected to inductance L1 and inductance
Between L2, the one end capacitance C9 is connected between inductance L2 and inductance L3, and the one end capacitance C10 is connected to inductance L3 and inductance L outputs
Between mouthful, capacitance C7, capacitance C8, capacitance C9 and capacitance C1 other end ground connection, the one end resistance R7 is connected with delivery outlet, another
End ground connection.
The A/D conversion circuits of vision signal are by modulus conversion chip ADC9280 chips and its peripheral circuit realization, specifically
A/D conversion chips ADC9280 can be used and its peripheral circuit is realized, the synchronizing signal of LM1881 is connected to ADC9280's
CLAMP pins filter the signal input AIN pins of output.The 8 parallel-by-bits output of ADC9280 is sent into FGPA numbers and carries out the time-division
Multiplexing process.Video d/a conversion circuit is the inverse transformation of video a/d conversion circuit, can restore the digital video signal of 8bit
For analog video signal.It is specific that DA9708 chips and its peripheral circuit realization can be used.
Audio signal in audio system transmission will also carry out A/D conversions and D/A conversions.The A/D conversions of audio signal are adopted
It is that CS5340 chips and its peripheral circuit realize that CS5340 chips use advanced Delta-Sigma analog-to-digital conversions structure
Support the sampling precision of all audio sampling frequencies 24.The D/A conversions of audio signal using CS4344 chips and its
Peripheral circuit realizes that CS4344 chips support multidigit D/A conversions, and inside is also useful for the analog filter of audio output signal
.CS4344 chip include there are one automatic rate adjuster, can by detecting current sample rate and chip clock frequency, 2 ~
Sample rate is automatically adjusted within the scope of 200KHz.
The control method of the utility model is as follows：（1）In transmitting terminal, the analog video signal that each road camera acquisition is arrived
It is adjusted circuit and A/D is converted into digital signal, meanwhile, by the collected audio signal of each road microphone by amplification, filter
Wave, A/D are converted to digital signal；（2）Under the control of sampling clock, digital video and audio signal are sent into system master core
Heart FPGA is time-multiplexed；（3）The signal of multiplexing is sent into parallel-serial conversion chip and carries out parallel-serial conversion, the signal warp after concatenation
Optical transceiver is sent on optical fiber；（4）In receiving terminal, the optical signal sent in optical fiber is converted into electric signal by optical transceiver, is led to
It crosses deserializer and carries out serioparallel exchange；（5）The parallel signal of conversion is converted into each road video through system master core FPGA
With each road road audio；（6）Digital sound, vision signal are carried out D/A conversions, adjusted circuit becomes digital sound, vision signal again
At original analog audio, vision signal.
By above description as can be seen that the utility model can be transmitted multichannel sound, vision signal by optical fiber, it is transmitted across
Distorted signals is small in journey, stable and reliable in work, and real-time Transmission effect is good, further increases the function of system, can be widely applied to
Business hall monitoring, warehouse monitoring, Automatic Teller Machine and self-help bank's monitoring etc., application range light can better meet reality
It needs.
Certainly, the representative instance of above only the utility model, in addition to this, the utility model can also have other a variety of
Specific implementation mode, all technical solutions formed using equivalent substitution or equivalent transformation all fall within the requires of the utility model protection
Within the scope of.
Claims (5)
1. the Transmission system of a kind of multi-channel video signal and audio signal, it is characterised in that：Including transmission module, optical fiber and reception
Module, transmission module include each road camera, each road microphone, A/D conversion circuits, system master core FPGA, parallel-serial conversion
Device and optical transceiver, each road camera and Ge Lu microphones are by A/D conversion circuits with system master core FPGA's
Input terminal is connected, and the input terminal of the output end parallel-to-serial converter of the system master core FPGA is connected, parallel-to-serial converter
Output end be connected with optical transceiver, the optical transceiver is connected with optical fiber wherein one end；The receiving module includes each road
VGA, each road microphone, D/A conversion circuits, system master core FPGA, serial parallel converter and optical transceiver, each road
VGA and Ge Lu microphones are connected by D/A conversion circuits with the output end of system master core FPGA, the system master
The output end of the input terminal deserializer of core FPGA is connected, and the input terminal of the parallel-to-serial converter is connected with optical transceiver
It connects, the optical transceiver is connected with the optical fiber other end.
2. the Transmission system of multi-channel video signal according to claim 1 and audio signal, it is characterised in that：Each road
Between camera and A/D conversion circuits, adjustment circuit is equipped between each road VGA and D/A conversion circuits, the adjustment circuit includes
Video amplifier circuit, clamp circuit and filter circuit.
3. the Transmission system of multi-channel video signal according to claim 2 and audio signal, it is characterised in that：The filtering
Circuit includes resistance R6, resistance R7, inductance L1, inductance L2, inductance L3, capacitance C7, capacitance C8, capacitance C9 and capacitance C10, resistance
R6, inductance L1, inductance L2, inductance L3 are sequentially connected in series between circuit input port and delivery outlet, and the one end capacitance C7 is connected to resistance
Between R6 and inductance L1, the one end capacitance C8 is connected between inductance L1 and inductance L2, and the one end capacitance C9 is connected to inductance L2 and electricity
Between feeling L3, the one end capacitance C10 is connected between inductance L3 and inductance L delivery outlets, capacitance C7, capacitance C8, capacitance C9 and capacitance
The other end of C1 is grounded, and the one end resistance R7 is connected with delivery outlet, other end ground connection.
4. the Transmission system of multi-channel video signal according to claim 1 and audio signal, it is characterised in that：The video
The A/D conversion circuits of signal are realized using modulus conversion chip ADC9280 chips and its peripheral circuit；The video d/a conversion
Circuit is realized using DA9708 chips and its peripheral circuit.
5. the Transmission system of multi-channel video signal according to claim 4 and audio signal, it is characterised in that：The audio
The A/D circuits of signal are realized using CS5340 chips and its peripheral circuit；The D/A conversions of the audio signal use CS4344 cores
Piece and its peripheral circuit are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820031211.5U CN207677911U (en) | 2018-01-09 | 2018-01-09 | The Transmission system of multi-channel video signal and audio signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820031211.5U CN207677911U (en) | 2018-01-09 | 2018-01-09 | The Transmission system of multi-channel video signal and audio signal |
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| Publication Number | Publication Date |
|---|---|
| CN207677911U true CN207677911U (en) | 2018-07-31 |
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ID=62972804
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| CN201820031211.5U Active CN207677911U (en) | 2018-01-09 | 2018-01-09 | The Transmission system of multi-channel video signal and audio signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108012128A (en) * | 2018-01-09 | 2018-05-08 | 苏州中亿丰科技有限公司 | The Transmission system and its control method of multi-channel video signal and audio signal |
| CN110708460A (en) * | 2019-09-05 | 2020-01-17 | 北京智行者科技有限公司 | Automatic parking system image acquisition method |
-
2018
- 2018-01-09 CN CN201820031211.5U patent/CN207677911U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108012128A (en) * | 2018-01-09 | 2018-05-08 | 苏州中亿丰科技有限公司 | The Transmission system and its control method of multi-channel video signal and audio signal |
| CN110708460A (en) * | 2019-09-05 | 2020-01-17 | 北京智行者科技有限公司 | Automatic parking system image acquisition method |
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