CN105611324B - Simulate high-resolution video transfer system - Google Patents
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- CN105611324B CN105611324B CN201511016222.3A CN201511016222A CN105611324B CN 105611324 B CN105611324 B CN 105611324B CN 201511016222 A CN201511016222 A CN 201511016222A CN 105611324 B CN105611324 B CN 105611324B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6168—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- Television Systems (AREA)
Abstract
The present invention relates to a kind of simulation high-resolution video transfer systems, mainly in simulation HD video system embedment digital signal, and row/field blanking for not used using it and free time when/frequency space is transmitted, therefore can accomplish backward compatible.Digital channel estimation technique is used simultaneously, it can accurately estimate amplitude-frequency and the phase-frequency response of coaxial cable/twisted-pair feeder channel, it is only capable of estimating channel response according to the amplitude-frequency response for measuring a small amount of frequency point of channel compared with prior art, precision of channel estimation provided by the invention increases significantly, to improve the adaptability to the especially poor cable of different channels.
Description
Technical field
The invention belongs to field of video transmission, are related to a kind of transmission system for transmitting videl signal on coax
System particularly relates to a kind of transmission of high-definition analog video signal on coaxial cable or twisted-pair feeder and the device of digital signal.
Background technology
Currently, the Analogvideotransmission based on coaxial cable is widely used in all kinds of closed-circuit TV monitoring system applications.Due to
Earliest CVBS standards cannot meet the needs of HD video transmission, and HD-SDI is adopted as coaxially in a long time
The standard of HD video transmission.However its very high data-rate limitation transmission range, usually have two in order to solve this problem
Approach：One is by digital high-definition video compress, rate is thereby reduced to reduce its requirement to channel, such as all kinds of is based on
The IP video cameras of MJPEG, AVC or HEVC, IP-based monitoring system can obtain the flexibility and safety of height, but compress
Image quality can be lost and cause to postpone, while IP systems cannot be compatible with original CCTV systems, installation and debugging are also increasingly complex.Separately
One approach is the extension based on CVBS technologies, by transmitting the simulation high-definition signal of higher bandwidth in coaxial channel to break through
Limitation of the CVBS standards for image resolution ratio.Its analogue transmission characteristic makes it meet with noise jamming or can be with when poor cable
It is smooth to degrade to improve the availability of system in extreme circumstances, and the CCTV systems based on CVBS can be utilized original
Wiring, installation and debugging are also more simple, this user smoother to upgrade to high-definition monitoring system from SD monitoring system
System.
Two above-mentioned paths are being obtained for swift and violent development in recent years, especially at home, simulation high definition standard such as aCVI,
HDCVI, TVI and AHD are widely applied.
Since current video camera/DVR (digital VTR, digital video recorder) is digital display circuit,
Therefore simulation HD video system needs that digital video is converted to analog signal in transmitting terminal, and is counted again in receiving terminal
Word.Since the transmission stage is analog signal, but simulates HD video system and do not guarantee that the videl signal received and transmission
Videl signal it is completely the same, therefore its for it is certain application there is shortcomings.Furthermore camera shooting generator terminal may have some number letters
Breath needs to be transmitted to the ends DVR, such as the HD digital image captured in camera shooting generator terminal wants to completely lossless be transmitted to
To preserve important image data, current simulation high definition Transmission system cannot be satisfied this requirement at the ends DVR.Current simulation
HD video system only has the uplink and downlink digital signalling channel there are one several kilobauds, is only capable of supporting menu configuration and holder control
The applications such as system, the primary resolution ratio for providing camera shooting generator terminal are captured, and Digital Audio Transmission even provides the number after coding simultaneously
It is substantially helpless that word compresses video subcode steaming transfer.
On the other hand, existing simulation high definition Transmission system needs to support long-line transmission, distance that can reach 300~500m
It is even longer, and long cable brings the signal decaying and dispersion of bigger.Generally use is simulated in the transmission of simulation high definition thus
Equilibrium compensates channel distortion with pre-emphasis technique.But the premise that channel distortion can be compensated is carried out to the characteristic of channel
Correctly estimation.As HDCVI by the amplitude difference to color burst and brilliant synchrotron head to the compared estimate characteristic of channel.
TVI has then used a line transmission assigned frequency and the sinusoidal signal of level to determine channel declining in this frequency in the frame blanking phase
Subtract situation.However these measures all amplitude-frequency response of the remeasurement channel on characteristic frequency point, can not completely obtain channel
Response characteristic, therefore also need to carry out further estimation work to the characteristic of channel according to cable model in the application.But in reality
Border is using the model of standard coaxial cable or twisted-pair feeder, quality and installation environment difference great disparity, a set of cable model and a small amount of
The amplitude-frequency responses of several frequency points the actual channel characteristic of application environment can accurately not described, this makes the effect of channel compensation
Fruit cannot reach expected, especially be susceptible to the various images such as smear, fuzzy, ghost image and contrast decline online in poor cable
Mass loss.
Invention content
Main purpose of the present invention is providing a kind of simulation high-resolution video transfer system, can solve existing simulation HD video
Standard does not have the problem of high-speed figure up channel, while solving and quality especially longer for complicated field wiring environment
The adjustment of poor cable.
The technical way taken to achieve the aforementioned purpose is that aforementioned analog high-resolution video transfer system is made to have a hair
Sending end and a receiving terminal；Wherein
The transmitting terminal includes：
One video processing module is that the HD digital vision signal that will be inputted is converted to the bright of raster order scanning
Chrominance signal；
One signal modulation/mixing module is will to receive the bright signal to modulate and be mixed into a composite video signal；
One first digital processing element is modulated to the digital signal to an input；
One adder, to mix modulated digital signal, the composite video signal and one synchronization/control signal
After obtain a composite video digital signal；
One pre-emphasis module, composite video number will be obtained after composite video digital signal progress preemphasis
Signal；
One DAC module, the composite video digital signal is converted into an analog signal；
One circuit drive module, to amplify and send out the analog signal；
The receiving terminal includes：
The analog signal of reception is amplified and tentatively compensates fading channel by one analog front-end module；
One ADC module is sampled according to analog signal described in a timing information and quantifies to obtain composite video number
Signal；
One synchronous detection module, by obtaining the synchronizing information in the composite video digital signal；
One video signal separation module receives the composite video digital signal and the synchronizing information, and from again
It closes in video signal and isolates the digital signal and the composite video signal；
One second digital processing element, to receive the digital signal (2), generate after processing the location information,
One channel information and a digital signal (3)；And the digital signal (3) is subjected to source coding, it is input to described the to obtain
The digital signal of one digital processing element；
One time domain equalizing demodulation separation module, by the channel information of reception, the digital signal (3) and described multiple
It closes videl signal to complete time domain equalization and actively offset operation, and completes to demodulate and detach to obtain the bright signal；
One video processing module goes forward side by side line raster counter-scanning to be converted to the high-resolution to receive the bright signal
Digital video signal.
It can be in simulation HD video system embedment digital signal, the row/field blanking not used using it using above-mentioned technology
And when idle/frequency space is transmitted, and can accomplish backward compatible.And due to the use of digital channel estimation technique,
Amplitude-frequency and the phase-frequency response that can accurately estimate coaxial cable/twisted-pair feeder channel are only capable of being believed according to measurement compared with prior art
The amplitude-frequency response of a small amount of frequency point in road estimates channel response, and precision of channel estimation of the invention increases significantly, to improve
To the adaptability of the especially poor cable of different channels.
Description of the drawings
Fig. 1 is the block diagram of a typical simulation high-resolution video transfer system.
Fig. 2 is the block diagram of the simulation high-resolution video transfer system of the present invention.
Fig. 3 is the frame assumption diagram of a typical simulation high-resolution video transfer system.
When Fig. 4 is the signal of a typical simulation high-resolution video transfer system/frequency performance plot.
Spectrogram when Fig. 5 makes digital signal and composite video signal share identical frequency band for the present invention.
Specific implementation mode
Coordinate schema and presently preferred embodiments of the present invention below, the present invention is further explained to reach predetermined goal of the invention institute
The technological means taken.
Fig. 1 is the framework of a typical simulation high definition Transmission system.Including a transmitting terminal 10 and a receiving terminal 20；Its
In, the transmitting terminal 10 includes a video processing module 11, one signal modulation/mixing module 12, an adder 13, a preemphasis
Module 14, a DAC module 15 and a circuit drive module 16；The video processing module 11 receives to come from externally input high definition
Clear digital video signal is converted into the bright signal 0 of raster order scanning, and usual blanking interval is inserted into be completed in this stage.
Signal modulation/the mixing module 12 receives the bright signal 0, is modulated and is mixed into a composite video signal 0.It is described
Composite video signal 0 is synchronous with one/and control signal enters the pre-emphasis module 14 after being added by the adder 13, and it is described pre-
The high fdrequency component of the signal of the amplification input of emphasis module 14 is to compensate fading channel and will treated that signal is sent to the DAC moulds
Block 15.The DAC module 15 receives the digital high-definition videl signal of input and is converted into an analog signal 0, the simulation
Signal 0 is transferred into the circuit drive module 16, and the analog signal 0 of input is amplified and passed through by the circuit drive module 16
Coaxial cable or twisted-pair feeder are sent out.
The receiving terminal 20 includes an analog front-end module 21, an ADC module 22, a synchronous detection module 23, a signal
Separation/demodulation module 24 and a video processing module 25；Wherein, the analog front-end module 21 will come from coaxial cable or double
The signal of twisted wire, which amplifies and compensates, to be obtained an analog signal 1 after fading channel and is sent to the ADC module 22.The ADC module
22 reception analog signals 1 simultaneously are carried out being converted to a composite video signal 1.The synchronous detection module 23 compound is regarded from described
Synchronizing signal, including the synchronizing signal of row/field and chrominance carrier are extracted in frequency signal 1.Signal separator/the demodulation module
24 are isolated from composite video signal 1 brightness and carrier chrominance signal using the synchronizing signal and carry out demodulation and obtain light tone letter
Number 1.Bright signal 1 after demodulation enters the video processing module 25 into line raster counter-scanning, is converted to high definition digital
Vision signal r.A HD digital signal is just sent out from transmitting terminal 10 by coaxial cable or twisted-pair feeder by above system
It send to receiving terminal 20.
Fig. 2 is the simulation high definition Transmission system structure chart after having used the present invention, and basic framework is identical as Fig. 1.It does not exist together
It is：The transmitting terminal 10 of the present invention further comprises one first digital processing element 17 for handling digital signal, in the present embodiment
In, first digital processing element includes a message sink coding module 171, a digital modulation module 172：The receiving terminal 20 wraps
Include analog front-end module 21, an ADC module 22,23 1 video signal separation module 26 of a synchronous detection module, a time domain
Equalizing demodulation separation module 27, a video processing module 25 and one second digital processing element 28：The second digital processing list
Member 28 includes a digital timing recovery module 281, a digital signal receiver 282, a channel estimation module 283 and an information source solution
Code module 284.
The present invention is identical as primal system to the processing of HD digital vision signal, the video processing of the transmitting terminal 10
Module 11 receives to come from externally input HD digital vision signal, is converted into a bright signal of raster order scanning
0, usual blanking interval is inserted into be completed in this stage.The signal modulation mixing module 12 receives bright signal 0, is modulated and is mixed
It is combined into a composite video signal 0, simulation high definition Transmission system common at present uses base band transmission in luminance signal, in coloration
It is transmitted after being modulated to subcarrier using AM on signal, but the present invention is defined not to this.
The digital signal carries out message sink coding by the message sink coding module 171, and the message sink coding module 171 is wrapped
It includes but is not limited to the operations such as scrambler, intertexture, the insertion of Error Correction of Coding training sequence and obtain digital signaling zero, the digital signaling zero enters
The digital modulation module 172, the digital modulation module 172 can with but do not limit using AM (amplitude modulation) or OFDM is (just
Hand over frequency division multiplexing) etc. modes modulate the digital signaling zero and obtain digital signal 1, can be, but not limited to use in modulated process
The technologies such as digital filtering and shaping pulse make it be matched with the composite video signal to adjust the frequency spectrum 1 of the digital signal 1
0 spectral characteristic in order to make full use of the transmission channel optimized for the latter, and avoids emc issue.It is modulated
Digital signal 1 and composite video signal 0 it is synchronous with one/control signal mixing after obtain a composite video digital signaling zero.It is described multiple
The conjunction entrance of video signal 0 pre-emphasis module 13 is described multiple by obtaining a composite video digital signal 1 after preemphasis
It closes video signal 1 and is converted into an analog signal 0 by the DAC module 14, and pass through the circuit drive module 15
Amplify and sends out.
The analog front-end module 21 of receiving terminal 20 will be amplified from the signal of coaxial cable or twisted-pair feeder and tentatively be compensated
Analog signal 1 is obtained after fading channel and is sent to the ADC module 22, in order to adapt to different channels, the AFE(analog front end) mould
The gain of block 21 can usually be adjusted with amplitude-frequency response, but specific adjustment mode and strategy are close with effect relation, each specific
All may be different in realization, the present invention is defined not to this, is repeated no more.The ADC module 22 is according to the number
The digital timing recovery module 281 of signal processing unit 28 provides a timing information and is quantified with being sampled to analog signal 1
A composite video digital signal 2 is obtained, the ADC module 22 may be used fixed sample instance sample and implement the side of resampling
Formula is realized to be sampled in given time, can also be realized by the way of the variable sampling moment and be sampled in given time, can also adopted
It realizes in other ways and can be changed instance sample, the present invention is defined not to this.
The composite video digital signal 2 is sent into the synchronous detection module 23, and the synchronous detection module 23 is defeated from its
Enter and obtain synchronizing information in signal, can include but is not limited to frame synchronization, row synchronization and colour synchronisation.The composite video number letter
Numbers 2 and synchronizing information be also sent to the video signal separation module 26, the video signal separation module 26 from
Digital signal 2 and composite video signal 1 are isolated in composite video digital signal 2.Digital signal 2 is sent to the number simultaneously
Word signal receiver 282, channel estimation module 283 and digital timing recovery module 281.Digital signal receiver 282 can be adopted
With but be not limited to equilibrium/amplification/demodulation/decoding/judgement the digital signal 2 of input handled, therefrom reply out digital letter
Numbers 3.This digital signal 3 is sent to source coding module 284, channel estimation module 283 and digital timing recovery module 281.
Digital timing recovery module 281 receives digital signal 2 and digital signal 3, and using the algorithm of digital timing recovery module 281 from
Middle acquisition sampling timing information, and it is sent to ADC module 22.The channel estimation module 283 receives digital signal 2 and number
Word signal 3, and estimate that channel, the channel information estimated are supplied to time domain equalization to demodulate separation module 27 using it.It is described
Time domain equalization demodulate separation module 27 using channel information and digital signal 3 and composite video signal 1 complete time domain equalization with
And actively offset operation, eliminate the intersymbol interference that fading channel and dispersion introduce from composite video signal 1, and regarding
Frequently possible remaining Some digital signal in/digital signal separation process, and complete to demodulate and detach to obtain brightness/chroma signal
That is luminance chrominance signal 1.In specific implementation, this balanced and demodulating process can be carried out with exchange sequence or combination to obtain
Better performance, the present invention are defined not to this.Bright signal 1 after demodulation enters the video processing module 25 and carries out light
Grid counter-scanning is converted to fine definition numerical digit vision signal r.Digital signal 3 carries out information source by the source coding module 284
Decoding obtains digital signal r.Such HD digital vision signal is just sent from transmitting terminal 10 by coaxial cable or twisted-pair feeder
To receiving terminal 20, while digital signal is also sent to receiving terminal from transmitting terminal 10 by same root coaxial cable or twisted-pair feeder
20。
Fig. 3 is the frame assumption diagram of a typical simulation high-resolution video transfer system, and Fig. 4 is a typical simulation high definition
When the signal of Video transmission system/frequency characteristic.Existing simulation high definition Transmission system all has similar framework：Brightness uses base
Band transmission, coloration are modulated using AM, and synchronization mechanism is using color burst using the level synchronization similar to NTSC, colour synchronisation
Chrominance carrier, which is directly transmitted, by head of being expert at realizes synchronization.The main distinction of each simulation high definition Transmission system is frame knot
Structure and subcarrier frequency.Brightness/chroma frequency range is kept completely separate in certain simulation high definition Transmission systems such as HDCVI, and certain systems
Frequency range both in system such as aCVI will appear overlapping.The present invention does not define this.Particularly, due to analog video signal
Raster scanning characteristic, main energy concentrates near line frequency, therefore can be by coloration in Analogvideotransmission standard
Frequency range overlapped with brightness, 1/2 line frequency of frequency range interval (such as aCVI and NTSC) or 1/4 line frequency (such as PAL) that the two uses, and
Receiving terminal 20 completes YC separation using comb filtering.
The present invention using simulation high definition transmission when/frequency space in idle region transmit digital signal.It can select to protect
Original synchronization mechanism, including but not limited to row synchronization/field synchronization and colour synchronisation are stayed, to ensure that system can keep original spy
Property or the compatibility that further keeps down.Or the simultaneous techniques based on digital communication can be used to substitute original synchronization
Mechanism, to using original synchronization mechanism occupy when/domain space, further promoting transmission rate or reduce bandwidth occupancy
It extends transmission distance.Compared to original simulation high-resolution video transfer system, the present invention increases digital channel in the transmission signal.By
It can be, but not limited to provide carrier wave based on the modes such as data-aided timing recovery techniques by various in digital channel itself same
Step, sample-synchronous and frame/row synchronize, therefore synchronous detection module 23 can utilize and original simulation high-resolution video transfer system phase
Both same mode detects synchronizing signal, can also obtain synchronizing information by digital form described above, or may be used
In conjunction with mode, the present invention do not limit this.
Further, as Fig. 5 present invention can be, but not limited to digital signal 1 and composite video signal through digital modulation
0 shared band, and use the separation of both comb filtering and the completion of active cancellation technology.Compared to point of the tradition based on comb filtering
From technology, the active counteracting of addition can more effectively eliminate remaining digital signal components from composite video signal 0, avoid
The interference that the latter generates.
The present invention realizes by the embedded digital signal in simulating HD video system and is keeping simulating HD video system
The ability of Mbps to 10Mbps grades of digital channel is provided under the premise of advantage, it is sufficient to meet high-definition image and capture transmission, high quality
The Digital Audio Transmission even requirement of digital video transmission.
Embedded digital signal can utilize the row/field blanking that does not use of simulation HD video system and free time when/
Frequency space is transmitted, therefore can be accomplished backward compatible.Can accurately it be estimated together using digital channel estimation technique simultaneously
The amplitude-frequency of shaft cable/twisted-pair feeder channel and phase-frequency response are only capable of compared with prior art according to the amplitude-frequency for measuring a small amount of frequency point of channel
Response estimation channel response, precision of channel estimation provided by the invention increases significantly, outstanding to different channels to improve
It is the adaptability of poor cable.Hangover and the circuit of long-line transmission introducing can be effectively eliminated by introducing Time Domain Equalization techniques
The image deflects such as the reflection that impedance mismatch introduces.Digital signal interference time/frequency can be solved by introducing active cancellation technology
On close on analog signal the problem of, so as to further compress protection interval between the two, improve efficiency of transmission and simultaneously carry
Rising mould intends video quality.
Illustrate that the device of the invention structure, the present embodiment design objective are to meet 720p25 simulations with a specific embodiment
High-definition signal transmits.Brightness analog bandwidth 16MHz, total transmission bandwidth 24MHz.Digital up-link Channel Leakage bandwidth 10Mbps.
HD digital vision signal initially enters video processing module 11, switchs to time domain letter according to raster scan order
Number, and be inserted into blanking interval and be converted to bright signal, separately include luminance component and chromatic component.Then luminance component enters one
Low-pass filter limits bandwidth, and interference carrier chrominance signal, chromatic component is avoided then to use AM just after carrying out low-pass filtering
In intermodulation system to specified subcarrier, subcarrier frequency is 21MHz, brightness bandwidth 16MHz, chrominance bandwidth in the present embodiment
3MHz。
Digital channel uses 0~23MHz, digital signal to carry out Error Correction of Coding first in the present embodiment, is inserted into synchronizing sequence
Then carry out scrambler.Above procedure is completed by message sink coding module 17.It is modulated using a PAM8 after then carrying out grid coding
Device is modulated, and then Pulse shaped filter is used to carry out shaping to output spectrum so that signal spectrum can be close to composite video
The frequency spectrum of signal simplifies the design of receiving circuit and avoids emc issue.Higher digital channel bandwidth if necessary,
The modulation system of higher order can also be selected and the technologies such as OFDM can be added, the present invention makes restriction not to this.
In the present embodiment, frame synchronization is realized by the synchronizing sequence that is embedded in digital signal, therefore does not need to be additional same
Step/control signal, only color burst retain.Composite video signal 0 is with digital signal 1 and color burst through addition
Device 13, which is added, obtains composite digital video signal 0, and composite digital video signal 0 is input to pre-emphasis module 14 and obtains digital composite
The output of vision signal 1 to DAC module 15 is converted to the output of analog signal 0 to circuit drive module 16 to drive coaxial cable or double
Twisted pair channels.
The analog front-end module 21 of receiving terminal 20 will be amplified from the signal of coaxial cable or twisted-pair feeder and tentatively be compensated
Analog signal 1 is obtained after fading channel is sent to ADC module 22.ADC module 22 is provided according to digital timing recovery module 281
Timing information carries out sample quantization to analog signal 1 and obtains composite video digital signal 2.In the present embodiment, ADC module 22 uses
One 256 phase-locked loop, which is realized, can be changed instance sample, be generated according to the clock phase that digital timing recovery module 281 provides
Clock phase simultaneously carries out sample quantization.Composite video digital signal 2 is sent into synchronous detection module 23, and the latter is according to synchronizing sequence
Characteristic detects synchronizing sequence from input signal, and in the present embodiment, synchronizing sequence is compiled using a subset of grid coding
Code detects in order to receiving terminal.Composite video digital signal 2 and synchronizing information are sent to video signal separation module 26, institute
It states video signal separation module 26 and determines that digital letter is isolated in region from composite video digital signal 2 according to timing information
Numbers 2 and composite video signal 1.It is fixed that digital signal 2 is sent to digital signal receiver 282, channel estimation module 283 and number
When recovery module 281.Digital signal receiver 282 in the present embodiment completes the solution of grid coding using interconnected decoding equalizer
Code and equalization operation, and adjudicate and generate digital signal 3.Digital signal 3 and digital signal 2 are sent to source coding module
284, channel estimation module 283 and digital timing recovery module 281.Digital timing recovery module 281 uses data-aided number
Word timing recovery algorithm restores optimum sampling timing from digital signal 3 and digital signal 2, this ensures transmitting terminal 10 simultaneously
Sampling clock can accurately restore in receiving terminal 20, therefore the clock of receiving terminal 20 is synchronous with transmitting terminal 10, this is significantly simplified
Demand to frame/row synchronization.The channel estimation module 283 receives digital signal 2 and digital signal 3, and utilizes its estimation
Channel response, the channel information estimated are supplied to time domain equalization to demodulate separation module 27.Time domain equalization demodulates separation module
27 calculate the tap coefficient of transversal filter according to channel response, and are eliminated from composite video signal 1 using transversal filter
The intersymbol interference that fading channel and dispersion introduce then uses brightness and the carrier chrominance signal of digital filtering separation bright signal 1
Component, and demodulation is synchronized to its chroma signal component.It demodulates the local carrier used and comes from color burst.After demodulation
Bright signal 1 enter video processing module 25 into line raster counter-scanning, be converted to fine definition numerical digit vision signal r.Number
Signal 3 carries out source coding by source coding module 284 and obtains digital signal r.Such HD digital vision signal just from
Transmitting terminal 10 is sent to receiving terminal 20 by coaxial cable or twisted-pair feeder, while digital signal also passes through same root from transmitting terminal 10
Coaxial cable or twisted-pair feeder are sent to receiving terminal 20.
For the conversion for simplifying with BT.1120 or HDMI standard, in the present embodiment, frame structure is using consistent with the above two every
750 every trade frequency 22.5kHz of frame, each video line 1650 sample.Each video frame includes 720 effective rows, that is, includes that simulation is high
The video line of clear videl signal.Digital signal uses 25 in remaining video row, remaining 5 row to be reserved to down channel use.
Digital signal is using 1650 whole samplings in blank lines, and analog video uses 1280 samplings, number in effective row
Channel is reserved to color burst, synchronizing sequence and protection interval using 200 samplings, residue sampling.Therefore digital up-link letter
Road can transmit (1650*25+200*720) * 3=771750bit in each frame, and peak transmission rate is up to 13.8Mbps.
Consider that the bandwidth that Error Correction of Coding, signaling and synchronizing sequence occupy, effective transmission bandwidth can reach 10Mbps or more.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, in the range of not departing from technical solution of the present invention, when the technology contents using the disclosure above make a little change or repair
Decorations are the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, technology according to the present invention is real
Any simple modification, equivalent change and modification made by confrontation above example still fall within the range of technical solution of the present invention
It is interior.
Claims (9)
1. a kind of simulation high-resolution video transfer system has a transmitting terminal and a receiving terminal；It is characterized in that：
The transmitting terminal includes：
One video processing module is the light tone letter that the HD digital vision signal that will be inputted is converted to raster order scanning
Number；
One signal modulation/mixing module is will to receive the bright signal to modulate and be mixed into a composite video signal；
One first digital processing element is modulated to the digital signal to an input；
One adder, will be obtained after modulated digital signal, the composite video signal and one synchronization/control signal mixing
Obtain a composite video digital signal；
One pre-emphasis module, composite video number letter will be obtained after composite video digital signal progress preemphasis
Number；
One DAC module, the composite video digital signal is converted into an analog signal；
One circuit drive module, to amplify and send out the analog signal；
The receiving terminal includes：
The analog signal of reception is amplified and tentatively compensates fading channel by one analog front-end module；
One ADC module carries out sample quantization to the analog signal according to a timing information and obtains a composite video digital signal；
One synchronous detection module, by obtaining the synchronizing information in the composite video digital signal；
One video signal separation module receives the composite video digital signal and the synchronizing information, and is regarded from compound
A digital signal (2) and the composite video signal are isolated in frequency digital signal；
One second digital processing element generates the timing information, a letter after processing to receive the digital signal (2)
Road information and a digital signal (3)；And the digital signal (3) is subjected to source coding, it is input to first number to obtain
The digital signal of word processing unit；
One time domain equalizing demodulation separation module by the channel information of reception, the digital signal (3) and described compound regards
Frequency signal completes time domain equalization and actively offsets operation, and completes to demodulate and detach to obtain the bright signal；
One video processing module goes forward side by side line raster counter-scanning to be converted to the HD digital to receive the bright signal
Vision signal.
2. simulating high-resolution video transfer system according to claim 1, it is characterised in that：The first digital processing element packet
It includes：
One message sink coding module is to carry out message sink coding to the digital signal of input；
One digital modulation module is to being modulated by the digital signal of Signal coding.
3. simulating high-resolution video transfer system according to claim 2, it is characterised in that：The message sink coding module includes disturbing
Code interweaves, the insertion of Error Correction of Coding training sequence.
4. simulating high-resolution video transfer system according to claim 1, it is characterised in that：The second digital processing element packet
It includes：One digital timing recovery module, a digital signal receiver, a channel estimation module and a source coding module；Wherein
The digital signal (2) that the video signal separation module is isolated from the composite video digital signal is same
When be sent to the digital signal receiver, channel estimation module and digital timing recovery module；The digital signal receiver
The digital signal (3) is replied out from the digital signal (2), the digital signal (3) is sent to the source coding
Module, channel estimation module and digital timing recovery module；
The digital timing recovery module receives the digital signal (2) and digital signal (3), therefrom obtained using algorithm described in
Timing information, and it is sent to the ADC module；
The channel estimation module receives the digital signal (2) and digital signal (3), and the channel is obtained using estimation channel
Information is supplied to the time domain equalization demodulation separation module；
The time domain equalization demodulation separation module utilizes the channel information and the digital signal (3) and composite video signal
It completes time domain equalization and actively offsets operation；
The source coding module carries out source coding to the digital signal (3) and is input to first digital processing to obtain
The digital signal of unit.
5. simulating high-resolution video transfer system according to claim 4, it is characterised in that：The digital signal receiver uses
One interconnected decoding equalizer completes decoding and the equalization operation of grid coding, and adjudicates and generate the digital signal (3).
6. simulating high-resolution video transfer system according to claim 4, it is characterised in that：The ADC module is according to the number
The sampling timing that word timing recovery module provides carries out sample quantization to the analog signal.
7. simulating high-resolution video transfer system according to claim 4, it is characterised in that：The synchronous detection module is according to same
The characteristic of step sequence detects synchronizing sequence from input signal.
8. simulating high-resolution video transfer system according to claim 4, it is characterised in that：The digital timing recovery module makes
Restore optimum sampling timing from the digital signal (3) and digital signal (2) with data-aided digital timing recovery algorithm.
9. simulating high-resolution video transfer system according to claim 4, it is characterised in that：The time domain equalization demodulates splitting die
Root tuber it is believed that one transversal filter of road response computation tap coefficient, and interrogated from the composite video using the transversal filter
The intersymbol interference of fading channel and dispersion introducing is eliminated in number.
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| CN106303486A (en) * | 2016-09-29 | 2017-01-04 | 杭州雄迈集成电路技术有限公司 | A kind of reception device utilizing Double-strand transmission super large resolution and superelevation frame per second video signal |
| CN106791839B (en) * | 2016-12-19 | 2020-03-27 | 中国航空工业集团公司洛阳电光设备研究所 | Method and device for digitally sampling CCIR (China center IR) or EIA (electronic article Association) standard analog video |
| CN106713866B (en) * | 2016-12-28 | 2019-11-19 | 浙江大华技术股份有限公司 | A kind of analog video signal transmitting device and its transmission method |
| CN107370964B (en) * | 2017-07-07 | 2020-02-07 | 深圳市小镜科技有限公司 | Digital USB signal conversion system for monitoring equipment and implementation method |
| CN109040663A (en) * | 2018-04-03 | 2018-12-18 | 深圳市麦道微电子技术有限公司 | The capture of the HD video of young mobile inside rear-view mirror, transmission and display technology |
| CN108763125A (en) * | 2018-05-24 | 2018-11-06 | 贵州斯曼特信息技术开发有限责任公司 | A kind of data transfer of computer acceleration system |
| CN112954165B (en) * | 2021-02-09 | 2022-10-04 | 杭州海康威视数字技术股份有限公司 | Analog camera, decoder and monitoring system |
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