CN1109666A - Improved data with video transmitter - Google Patents
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- CN1109666A CN1109666A CN 94103906 CN94103906A CN1109666A CN 1109666 A CN1109666 A CN 1109666A CN 94103906 CN94103906 CN 94103906 CN 94103906 A CN94103906 A CN 94103906A CN 1109666 A CN1109666 A CN 1109666A
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Abstract
The present invention shows a signal processor used for transfering and receiving data at the same time of making transparency in vidio bandwidth. Said processor can make said data pass through a grating instrument at a horizontal-scanning rate in transmitter, and make it multiply by non-integer of the horizontal-scanning rate, and then uses a data carrier to modulate said data to obtain frequency interlace. Said data can be transfered in the scanning vidio period of each vidio line.
Description
The present invention relates to two signals of emission on a communication channel of video transmitter, especially partly transmit the side and the device of data at the scan video of a vision signal.
The application is the part continuation application of No. 07/715,920, the United States Patent (USP) submitted on June 14th, 1.
Existing several technology allow two signals to send on same communication channel, when communication channel was the spectrum bands width of an appointment, these methods comprised time division multiplexing, launched polarized wave orthogonally, by two kinds of mutual transparent method emissions, and frequency interleave.
For vision signal, for example NTSC and PAL signal have several diverse ways to be used at the frequency band additional information transmission.For example, a colourity (colour) signal is by carrier chrominance signal and the transmission of luminance signal (black and white) frequency interleave ground.Especially for the NTSC standard, luminance signal and carrier chrominance signal are frequency interleaves.Certainly, carrier chrominance signal is very relevant with luminance signal, and they have showed high correlation.
In signals transmission, the cycle that has, for example in vertical and horizontal blanking cycle, there is not the pictorial information transmission, in some system, for example be the weak used closed-captioned television of people of hearing, its closed caption information was transmitted during the vertical blanking cycle.Certainly, utilize the data transfer rate of transmission system of blanking cycle relatively low, 20,000 of general per seconds.Though this traditional rate is suitable for the closed-caption TV, and for the bulk information transmission, for example T1 of per second 1.544 megabits transmission, the transfer rate that then seems is too low.
Therefore, first purpose of the present invention is the data rate transmission that allows the blanking cycle allowed to be higher than.
Second purpose of the present invention is to allow high data rate transfers and do not cause interference from transmission information to general television receiver.
The 3rd purpose of the present invention is to utilize frequency interleave to realize this transmission.
More than and other purpose realize carrying out secondary data and transmitting and realize by scanning main video cycle when the picture element message transmission, rather than utilize level or vertical blanking cycle to realize.The data of being transmitted are carried out frequency interleave by colourity and luminance signal.
The signal processor of the employed conveyer of advanced communication system disclosed herein comprises five parts.A main video section, a timing part, a video analysis part and a data modulating part that receives main video signal.Timing partly produces the non-integer multiplication of video level scanning frequency, so that data division is used for modulating.In addition, timing partly produces a composite blanking pulse, so that the data that the data division rasterisation is transmitted.
Another part is a noise jamming decay part, the output of its receiver, video part, and be the staggered noise signal that expression noise in the frequency gap is provided of main video signal, noise signal can deduct from vision signal, puts on the noise of modulated data signal with attenuation video and data-signal compound tense.
Secondary data partly receives the secondary data signal, and this signal can be the analog or digital signal.Secondary data part rasterisation and modulated data signal are so that the data-signal of being modulated carries out frequency interleave by main video signal.
Data division data with rasterized signal, comprising vertical and the horizontal blanking cycle, these cycles the data-signal of modulating and main video signal mutually those blanking cycles in compound tense and the main video signal meet.Modulated by a data carrier subsequently by the data of rasterisation, so that modulated data light spectrum envelope and main video envelope are staggered.Compound consequential signal can be received by the ordinary video receiver, and does not have noise jamming in this video receiver.
Data-signal can be recovered by the receiver that is incorporated into dedicated signal processors.Have the filter that the frequency of secondary data passes through and provide data-signal for phase compensator.This phase compensator is eliminated the phase shift of filter induction.Afterwards, the output of compensator can be by demodulation, decode and separate grating.Be to realize demodulation, timing circuit should be included, to produce data carrier and to comprise the system clock of blanking cycle.
Description of drawings:
Fig. 1 is a signal processor block diagram in conjunction with the embodiment of the invention, is used for transmitter.
Fig. 2 is the used signal processor block diagram of the receiver of the embodiment of the invention.
Fig. 3 is the used signal processor block diagram of the transmitter in the second embodiment of the invention.
Fig. 4 is the block diagram of the employed signal processor of receiver in the second embodiment of the invention.
Fig. 5 is the block diagram that the present invention is used for the embodiment of medical care image.
Fig. 6 is the embodiment block diagram that the present invention is used for computer network, and this network uses cable television devices and telephone wire.
Fig. 7 is the embodiment block diagram that the present invention is used for two-way computer network, and this network uses the CATV transmission device.
Fig. 8 is the detailed map of input (Headend) shown in Fig. 7.
Figure 9 shows that the block diagram of user endpoints.
Figure 10 is the detailed map of (tape) dish core among Fig. 8.
Fig. 1 has showed the embodiment of the signal processor 10 of transmitter, and the T1 transfer rate that this transmitter can per second 1.544 megabits utilizes main NTSC colour-video signal by transmitter transmission secondary numerical data.Other embodiments of the invention can be used for other data rate transmission numerical data, or form signal transportation simulator data with ntsc video signal or other video.
A main video signal that is received can be a NTSC colour signal with vertical blanking frequency of 15,734,264 hertz horizontal blanking frequency and 59.940052 hertz in the present embodiment.This main video signal is made up of brightness and carrier chrominance signal.This NTSC signal also had by in the scan video cycle between vertical and pulse of horizontal synchronization direction and the blanking cycle in the determined vertical and horizontal blanking cycle.In the scan video cycle, the picture element information of delegation's video and graphic is transmitted., should understand that this main video signal can be any by the vision signal of rasterisation, comprises the visual form that is generally used for other national Phase Alternation Line system.Certain with on main video signal be provided for main video section 20, timing part 30 and video analyzer 40.
The peak-peak amplitude of main video signal is subject to one by the predetermined standard of the horizontal blanking sync direction pulse level of automatic gain control amplifier 22 and vision signal, and the predetermined voltage of this vision signal is set by DC restorer 24.If main video signal is a NTSC signal, then the function of DC restorer 24 and automatic gain control amplifier 22 is that output 25 in RS 170A standard provides signal.If main video signal reaches RS 170A standard, then amplifier 22 and restore circuit 24 can save.
Input data and external timing signal are provided for first-in first-out elastic buffer 52.The data clock control data deposits the speed of buffer 52 in.The speed of elastic buffer 52 dateouts is by two signal controlling, the inhibit signal that the system clock that timing part 30 provides/rasterisation signal 33 and video analyzer part 40 provide.
Under the effect of clock signal of system 33, the rate output data of being scheduled to during 52 scan video parts of elastic buffer with signal.System clock 33 is used to control the data output of rasterisation elastic buffer 52, to generate blanking cycle.
During blanking cycle, there are not data from elastic buffer 52 outputs.When not having data when buffer is exported, blanking cycle is adjusted fully, so that the output blanking cycle of video section 20 and data division 50 is synchronized with summer 70.
Further, if to carry out at a high speed transfer of data, T1 for example, then elastic buffer 52 is inhibited in dateout during the video line part with drastic shift, and this will elaborate in the back.When video analyzer part 40 is not forbidden elastic buffer, the output of elastic buffer 52 then is the rasterisation form of input secondary data, the data that for example have identical lasting blanking cycle, and those are at data division 50 blanking cycles output and in video section 20 outputting video signals, and this two-way blanking cycle is consistent when arriving summer 70.
Be provided for encoder 54 from the rasterisation secondary data signal of buffer 52 output, this encoder is receiving system clock and from the inhibit signal of video analyzer 40 outputs also.Encoder is with the digital coding of restricted band width.Encoder 54 can be non-return-to-zero recording (NRZ) encoder, frequency modulation(FM) (FM) encoder, modified frequency modulation (MFM) (MFM) encoder, Manchester code (Manchester) encoder, 1,7 rll encoder device, 2,7 rll encoder devices, or any other restriction from elastic buffer 52 output by the encoder of the frequency bandwidth of data with rasterized signal.In addition, can utilize data confidentiality device and piece error correcting code device to provide maintains secrecy or the improvement error rate.
The output of this encoder offers multiplier 56, with the coded data on the modulating data carrier wave.This coded data and a data carrier are phase locked, and do which amplitude modulation by multiplier 56.In this specific embodiment, the carrier wave of this modulation be according to data encoded be 1 or 0 decide with or need not.
, in other embodiments, may adopt different modulation schemes.For low secondary data rate transmission, coded data does not need the data sync with modulation, and a data bit can be through several periodic transfer of data carrier, for higher data, coded data and data carrier are synchronous, allow two to be used for higher data-rate of transmission with upper level.For example, half period can have a zero-bit level peak, one 1/3 dominant bit level peak, and one 2/3 dominant bit level peak and a dominant bit level peak, so that two data bit can be transmitted in a half period.Other technology is used for increased data rate, quadrature amplitude modulation for example, and Quadrature Phase Shift Keying and phase modulated, its data and data carrier are synchronous.The data transfer rate of numerous second 280 kilobits does not require that this every half period carries out the technology of multidigit modulation.
The modulating data carrier wave that has coded data transmits by low pass filter 58, and this filter only allows to transmit the lower sideband data carrier.The upper sideband of data carrier and whole harmonic wave are low pass filtering device 58 blocking-up.
The output of low pass filter 58 offers the homophase input of summer 70, makes the video of the secondary data of the rasterisation of being modulated and processing compound.The timing of data division 50 and video section 20 provides forbidding meeting of interval to blanking cycle in the vision signal of summer 70 and Grating Modulation data-signal.From the composite signal of video section 20 and data division 50 outputs are baseband frequency signal, and it has information that is used for data-signal and the information that is used for frequency video signal, and is broken down into the base band of separating that has minimum overlay respectively.The signal that is decomposed subsequently can the transmission of normal data rate.
The selection of above-mentioned data carrier is a particular case, and other non-integer multiplication also can be used.The criterion of data carrier is: (1) should be the non-integral multiple increment of load ripple of horizontal frequency, and (2) should be greater than chrominance carrier, and (3) should be outside the brightness base band, within the video channel bandwidth, so that there is not interference in the sound channel.
In addition, timing partly uses phase-locked loop to produce system clock grating signal 33, is used for the input data of elastic buffer 52.System clock frequency should be the subharmonic or the harmonic wave of horizontal frequency.The selection of system clock frequency should be according to peak data transfer rate during the scan video line and data clock rate.Clock should be under an embargo one section with each video and identical cycle in horizontal blanking cycle, so that there are not the data of modulation compound in summer 70 and vision signal during the blanking cycle of main video signal, for example the blanking cycle in the output of video 20 and data division 50 should be synchronous.Further, the system clock rate should be enough high, so that the unlikely overflow of elastic buffer.
Use phase-locked loop generation system clock and data carrier, meaning is that these two signals are that phase place is relevant.Doing like this is to allow modulator with high data rate transfers, and for example, every half period of data carrier is represented the transmission of a data element.
The 3rd output of timing part is the pulse that indicates the appearance in the forward position in the horizontal synchronization pulse.This forward position pulse provides with any several forward positions pulse-detecting circuit (not shown), and is used for being provided with blanking level with RS 170A standard by DC restorer 24.
In the higher data-rate of transmission system, may comprise a video analyzer 40.Video analyzer 40 comprises a digital signal processor, is used for analyzing the sweep test of vision signal, and this sweep test has the information of a picture group picture dot element in the expression drastic shift line.This video analyzer is searched the signal message of a drastic shift, and this transformation produces the strong high frequency bundle of brightness or photometric signal.Subsequently, an inhibit signal is sent to elastic buffer 52 and encoder 54.This inhibit signal is by time shift, and making does not have secondary data to be provided to summer 70 when the main video information of drastic shifts is represented in video section 20 outputs.The use of video analyzer 40 has further reduced the possibility of the interference between secondary data and the main video item.Video analyzer also can starting and stop code insert data flow can discern when avoiding interference so that receiver is under an embargo in transfer of data.
Have only high speed data rate, for example T1 and higher system just need video analyzer 40.For the lower data rate system, video analyzer 40 and inhibit signal can be removed from.Have in the system of video analyzer at those, the delay line 26 in the main video section 20 must fully postpone a time cycle with main video signal, so that analyzer 40 is handled a picture group picture dot element.If data transmission rate is relatively low, for example 1,000,210,000 of each seconds, then video analyzer 40 and delay line 26 can be removed from.
The output result of summer 70 is that main video signal and data frequency are staggered.In addition, the composite signal from summer 70 outputs still is the blanking cycle of standard NTSC signal.Therefore, this vision signal can need not detect secondary transmission data by the reception of standard NTSC receiver.
Avoid interference for further guaranteeing, the output signal level of noise jamming part 60 and secondary data part 50 should be calibrated.This calibration should be set to summer 70 with this two-part injection level, to avoid interference.The output stage of noise jamming part 60 is adjusted to minimal noise when receiver receives data-signal.The output stage of data division 50 also should be adjusted, and making does not have attractive interference on the video-frequency monitor of the output of being coupled to summer 70.
May need to transmit one in some applications and add low frequency signal, for example audio signal.For example, audio signal can be with the compress technique sampling of No. 5,021,786, United States Patent (USP), and is transmitted during horizontal synchronizing cycle.Such as if secondary data is the video of compression, the audio signal that is used for the left and right sides voice-grade channel of this compressed video can be sampled during each scan period, and be added during horizontal synchronization pulse.The frequency multiplier that timing signal is controlled can be used for the numerical data addition during horizontal synchronization pulse with compression.
Fig. 2 has showed a signal processor 100 that is used for video receiver, and this receiver separates the data of transmission with the signal that the video transmission device is transmitted, and the processor among this transmitter and Fig. 1 merges.Though it is interlaced to receive main NTSC signal and vision signal with secondary numerical data frequency shown in the present embodiment, and other embodiment can use other vision signal and master data.
In Fig. 2, the baseband signal that is received comprises video and data message by two section processes, and one is video section 120, and timing circuit 130 and video analyzer part 140.Video section 120 is handled the baseband signal that is received by automatic gain control amplifier 122 and DC restorer 124.The output of DC restorer offers noisy image equipment 123, and noisy image equipment 60 is identical in the filtering characteristic of this equipment and the transmitter.The output of the noisy image equipment 123 in the receiver 100 transmits the staggered frequence with transmission of data signals, but the blocking-up main video signal.The output of noisy image equipment 123 is provided to phase compensation 125, and this phase compensation is adjusted phase distortion according to noisy image equipment 123.Phase compensation 125 can be to have second filter that the antiphase of noisy image equipment 123 postpones, and is used to adjust the phase distortion that noisy image equipment 123 is introduced.
The phase compensation output signal is the regeneration that is offered the rasterisation modulated data signal of summer 70 by data division 50.The rasterisation modulated data signal is provided for data level detector 126, and this detector is the receiving system clock signal also.Data level detector 126 comprises a peak detector, is used for detecting at each system clock cycle the signal of a peak detection.For with the data receiver of the data transmitter compatibility of Fig. 1, data detector output is a digital signal preferably, it is " 1 " when the data carrier half cycle occurs, and its expression " 0 " when not occurring of data carrier half cycle.
Though above-mentioned data level detector 126 is transmitter 10 designs, be appreciated that this data level detector can be any and the form of the transfer of data level chopping phase compatibility of transmitter 10.For example, if data are phase modulated, then the data level detector can be a phase detector, if or transmitter use the quadrature amplitude modulation data, then this detector can be a quadrature amplitude wave detector.Further, if data transfer rate enough low to one digit number according to passing through several periodic transfer, per second 64 kilobits for example, then the data level detector can be an envelope detector.
Concerning High Data Rate, may need the circuit of a synchronous detecting modulating data.Clock recovery circuitry can be used for the clock that recovers to encode in data.This clock recovered can be used for the data sampling with modulation.The data that are sampled and modulate are provided for an analog to digital converter, to produce digital signal.Low pass filter, circulator and impulse slicer can be used for this data detector.
The output of data level detector 126 offers the data separating and the decoder 128 of output digital signal.The synthetic blanking signal that this data separating and decoder 128 are adjusted from timing circuit 130 time of receptions and by the regeneration of the data carrier of timing circuit 30 outputs.Data separating decoder 128 also receives from the video inhibit signal of video analyzer 140 outputs.Data decoder 128 is used for each clock data level of the same period, data carrier, and blanking composite signal and inhibit signal provide data, and its output clock rate is identical with the data transfer rate of the elastic buffer 52 that offers transmitter.Data decode separator 128 is also eliminated the decoding that decoder 54 is provided in the transmitter 10.
The output of separator 128 offers first in first out elastic buffer 129.Be input to of the system clock control of the data transfer rate of buffer 129 by timing piece 130.Can be with any data rate transmission of avoiding buffer overflows by the second clock (not shown) from the data of buffer output.
The video analyzer 40 of the mode of operation of video analyzer 140 and timing piece 130 and the timing part 30 of transmitter 10 identical.Analyzer 140 and timing piece 130 avoid data decode separator 128 to read the disable period that transmits in blanking cycle in the data with rasterized or the data.Therefore, data-signal will suitably recover the delay line (not shown), and this delay line should be included before the data level detector, and delay line will compensate the processing cycle of video analyzer 140.
; should be noted that; if the video analyzer among Fig. 1 40 inserts data flow with initial/stop code when forbidden data transmits owing to consider interference; this receiver does not need video analyzer 40; replace; as the part of decoding function, data decode separator 128 can detect initial/stop code.
Fig. 3 has showed another embodiment 200 of Fig. 1 processor, this processor is used for transmitter, same component adopts identical figure denote, this embodiment 200 comprises video section 220, timing part 230, data division 250 and summer 270, but do not have noise jamming decay part 60, and can not have video analyzer part 40.
But in this embodiment, the input baseband video signal is preferably made an amendment slightly by video section 220.For example, adopt the NTSC signal, luminosity in the vision signal chrominance section upper sideband and the band envelope of chrominance information part preferably are attenuated.For example, in using the system of ntsc video, low pass filter 227 will be eliminated the nearly all bands of a spectrum energy that is higher than 317 megahertzes in the vision signal.The characteristic that depends in part on specific video signal format and this cut-off frequency that are used for the cut-off frequency of vision signal are answered selected so that enough color video informations are transmitted.Thereby can not make spectators before the receiver feel chromatic colour information dropout.
And then, regularly part 230 has a control side device 232 synchronously, be used for producing the synchronous detection signal 231 that is used for automatic gain control amplifier 222 and DC restoration circuit 224, and produce each level of sign and the vertical blanking cycle of a synthetic video synchronizing signal 235.Timing circuit 230 comprises a carrier generator 233, is used to produce data carrier.This carrier wave is non-integer 1/4th multiplications of the horizontal frequency of the vision signal of the edge felling of the bandwidth of video signal preferably.Especially, frequency is that 4,197,114 hertz carrier wave is applicable to NTSC rasterisation video bandwidth signals very much.By horizontal frequency divided by 4 and this frequency is multiplied by a suitable multiplier (for example 1067) with phase-locked loop, just can obtain this data carrier.In another program, carrier generator 233 can be a self-excited oscillator, and its operating frequency is 1/4 of a horizontal scan rate (for example 4,197,114 hertz), the odd number multiplication.For obtain least interference and have colourity and the optimum frequency of the data-signal of luminosity information staggered, data carrier 237 should be near odd 1/4 multiplication of the horizontal sweep rate video base band frequency bands of a spectrum upper end, this carrier generator 233 is with clock frequency clock signal 239, this clock signal 239 preferably and carrier signal 237 fixed phase relationship is arranged, and can be the square wave form of carrier signal 237.
Thereby packet handler 253 is divided into some groups to the hyte of data with rasterized after will coiling randomization to data 252 programmings.Can adopt this class random process technology, promptly data 252 be offered one five bit shift register, therein, the 3rd and the 5th of this register carries out different logical process with the input data bit.Any other random process technology that prevents that recognizable pattern from appearing on the television video screen also can adopt.Unique initial code is added to every group section start and CRC or other error-detecting codes also can be included in one group end part.Though needn't comprise unique stop code one group of end.Every group preferably comprises about 1000, initial code and error-detecting code is wherein arranged.
The output of at least one timing signal 254 control packet handler 253 is so that suitably make data division be output as 0 in the cycle.Thereby the output that makes which amplitude modulation 256 is 0 in the blanking cycle from the vision signal of video section 220.In addition, timing signal 254 can make the blanking cycle in the output of data division 250 be longer than several data carrier cycles of blanking cycle of video section 220 outputs, thereby the data carrier pulse can be inserted into the capable section start of each scan video for synchronously.
Thereby export modulation and the data sync that makes data carrier for every during preferably timing signal 254 is also controlled and divided into groups.
In another embodiment, the duration of a bit is seven cycles of data carrier.Therefore, the output of timing signal 254 control packet handlers, just offer analog digital converter to a data bit period of wave thereby per seven numbers are refused to take a passenger.
Analog digital converter 257 is delivered in the output of packet handler 253, is used to limit the frequency band of packet handler output.This analogue data circuit 257 provides an analogue data position, and it is made up of a positive integer (limit band) pulse and a negative integer (limit band) pulse, this positive integer pulse as input traffic each 1 and the negative integer pulse as data flow each 0.Other coded systems (CM such as quadrature amplitude modulation) that are used for High Data Rate also can adopt.
The output of analogue data circuit 257 also is added to data balancing device one delay amplifier 258 in response to timing controling signal 254, thereby change the phase deviation that the phase place of the output of analogue data circuit 257 causes with the compensation notch filter by this analogue data equalizer-delay amplifier 258 of data carrier synchronous modulation of the peak value output level of control modulator 256 output, this will narrate below.Equalizer-delay amplifier 258 is also at least 100 kilo hertzs, best frequency more than 300 kilo hertzs is carried out frequency precorrection, thereby strengthens the recovery subsequently of data-signal and vision signal so that avoid cross noise to influence when the modulated data signal of a decay is synthetic with vision signal.
The timing signal 254 that IEEE RS 449 interfaces/raster processor 251 provides makes unmodulated pulse that the cycle of seven data carriers 237 is arranged approximately of modulator 256 outputs.The unmodulated pulse of data carrier 237 preferably conforms to the initial of each scan video cycle, so that can easily detect by the receiver 300 of Fig. 4 to obtain data carrier synchronous (as described below), this data carrier pulse is included in scan-data in the cycle, should be for retouching cycle data by modulator 256 output and preferably have one to be shorter than the duration in scan video cycle a little, thus the safety allowance that a short time is provided is to guarantee not having data and data carrier pulse to transmit in the cycle at video blanking.This timing signal 254 is also set the delay that is used for analog data signal, so that the blanking cycle in the data will be consistent with the output of video section 220.
In other words, a Phase synchronization sign is used for strengthening the data carrier pulse of being made up of a string " 1 ", and this sign can be inserted in the data flow of analogue data circuit 257 outputs according to the section start of suitable timing controling signal 254 at 263 row.This a string " 1 " continues hemistich and can is used to keep synchronously by receiver, as described below.
Which amplitude modulation device 256 is used for doing the output of equalizer-amplifier 258 data carrier is carried out which amplitude modulation.Because data have been the 1/4 non-integer multiplications of horizontal sweep rate by rasterisation and data carrier frequency, the bands of a spectrum of the modulating data carrier wave that overlaps with vision signal spectrum will be staggered with the bands of a spectrum of vision signal luminosity and chrominance section.
The peak-peak amplitude of summer 270 control modulated data signal, thus the data number of changing of this modulation adds with a low level.For example, a signal of 20 decibels under the output level of video section 220 may be utilized, and then, it should be noted that the output of timing controling signal 254 control analogue data circuit 257 and the output of amplifier 258, is 0 thereby make the output of modulator 256 in the vertical and horizontal blanking cycle of the output signal of filter 227.
The output of summer 270 then is added to notch filter 280, and it has a termination zone at the frequency range place of the audio-frequency unit of vision signal.The output of notch filter has then had audio-frequency unit and this whole synthetic signal that adds to transmit with an appropriate frequency by a transmitter (not shown).
Fig. 4 shows second embodiment of a signal processor, this example is used for the receiver with embodiment 200 compatibilities of Fig. 3, embodiment 300 comprises three parts: tuner pack 310, timing part 330 and data division 340, input is a RF video number of recognizing, this signal has a data-signal that adds, and for example the output of embodiment 200 is the rf frequency of 54-60MHz, is used for the NTSC signal of channel 2.
Tuner pack 310 is handled synthetic video and data-signal and is provided an intermediate-freuqncy signal to data reconciliation part 312 and video tuning part 314, the separating part of the intermediate-freuqncy signal that this section processes receives.This video tuning 314 comprises a bandpass filtering part with surperficial acoustic filter, this surface acoustic filter is by being lower than the frequency of chrominance subcarrier, be that those comprise the frequency of suitable minority according to the bands of a spectrum energy, this this intermediate-freuqncy signal of video tuner 314 heterodynes is to produce baseband video signal 315.This video baseband signal 315 need not to comprise many information, resembles to be defined level and the vertical signal.This video baseband signal 315 is supplied to synchronizing indicator 332, thereby a synthetic video synchronizing signal 333 is provided, level and vertical blanking cycle in its sign baseband video signal 315.
Data reconciliation device 312 comprises a bandpass filtering part, and this part comprises a surperficial acoustic filter by intermediate frequency in the data bandwidth scope.The output of filtering part is then by the modulated data signal 313 of heterodyne so that a 4.2MHz to be provided.To be input to the situation of summer 270 similar for modulator 256 among the output of high channel filter 327 and Fig. 3.
Be timed data carrier 334 demodulation that part 330 offers demodulator 360 from the analog signal of filter 327 outputs, this demodulator 360 is chosen as, and output compatible mutually with the modulator that sends part, demodulation is taken a sample so that numerical data to be provided by data-interface 362 then.In one embodiment, data-interface can respond the output sampling of 356 pairs of demodulators 360 of gating signal and provide numerical data in response to this sampling with Transistor-Transistor Logic level.Separated packet handler 364 from the numerical data of digital quantizer 362 output and decompose, and initial code and any self-correcting code are separated, and grouping 364 is removed and these data are decoded.If self-correcting code is used, this separates packet handler also can proofread and correct any transmission error as much as possible.
Numerical data output and a variable-speed data clock of separating packet handler 364 add to IEEE RS 449 interfaces 366 together.This interface 366 comprises a fifo buffer (not shown), and data enter this buffer under the control of clock signal 365.Data are exported by interface 366 under the variable data clock control of separating packet handler 364 generations.
Except producing synthetic synchronizing signal 333, regularly part 330 also comprises a carrier separation device 338 and the number baud generator 335 of refusing to take a passenger.For Phase synchronization between the carrier wave that makes in transmitter 200 data carriers 237 and receiver 300, the Phase synchronization identification data carrier pulse that carrier separation device 338 detects at each horizontal line section start, and provide the timing that detects pulse at each horizontal line section start by the timing controling signal 354 that digital synchronous device 336 produces, carrier separation device 338 provides phase control signal to a carrier generator 335, carrier generator 335 sends data carrier signal 334, thus the Phase synchronization of the phase place of the data carrier in receiver 334 and the data carrier in the transmitter 237.And two the number wave frequency of refusing to take a passenger locked, phase place and frequency lock can realize that promptly colour subcarrier and the colour subcarrier in the transmitter in normal receiver now is synchronous in such mode.Carrier generator 335 also sends the frequency identical with data carrier 334 and with data carrier 334 clock signal 339 of a known phase relationship is arranged.In one embodiment, data clock 339 can be the square wave form of the data clock that obtains by a comparator.
In the embodiment 300 of Fig. 4, thereby digital synchronous device 336 should preferably be adjusted and makes gating signal 330 and timing controling signal be adjusted the phase shift that produces with the high pass filter in the compensate for demodulator 360 327 and low pass filter (not shown).Especially, the output of the analogue data circuit 257 of the output of demodulator 360 in should repetition transmitter 200, but its noise and distortion then have been eliminated.Therefore, digital synchronous device 336 gating signal is provided in case when the forward of analog data signal or negative peak take place to the output sampling of demodulator.In addition, digital synchronous device 336 also provide gating signal 356 to separating packet handler 364 so that from data flow, remove blanking cycle.
Separating packet handler 364 provides data and data clock 365 preferably for RS 499 interfaces 336.Separate packet handler and calculate the figure place of previous video transmission image duration to produce this data clock.If reach less data in nearest legend image duration, the data clock rate reduces to follow this data transfer rate.If transmit more data up to maximum rate in previous frame, data clock speed increases, and the adjustment of clock rate is normally determined by the data in the buffer of interface 366.But, should be noted that when several frames do not have or have only only a few reportedly to send, this buffer will be empty.
For further wild phase bit synchronization, one optional " 1 " of transmitting between above-described 263 departures date string can be used to change the phase place of clock 335, and these timing circuit 330 signs transmit the vertical sync pulse of signals.In case timing circuit 330 has identified this vertical sync pulse, first string of 236 row just can identify, interface circuit 366 or signal (not shown) of digital synchronous 336 generations are detected by above-mentioned parts with the carrier phase synchronization of phase place between input and output that changes carrier wave to be finished, preferably realize Phase synchronization, thereby a string " 1 " of transmitting is designated a maximum forward amplitude during 236 row, first string by digital synchronous device 336 control carrier phases.In addition, the carrier wave that produces from generator 335 is adjusted so that keep Phase synchronization between the carrier wave of Transmitter processor 200 and receiver processor 300 its phase place in this way continuously.
By using embodiment 200 and 300 represented technology, can obtain the transfer of data of per second 384 kilobits.By recovering quadrature amplitude modulation, just can obtain the T1 data tape.
200 also comprise an analyzer (not shown) that the analyzer 40 among the embodiment 100 to Fig. 1 is similar with 300 embodiment, and this analyzer can further reduce any interference between vision signal and the data-signal.This analyzer detects the abrupt change in the vision signal.One detects this abrupt change that causes being higher than the high frequency bands of a spectrum component in the predetermined luminosity bands of a spectrum that limit, just suspends data and transmit after suitable initial/stop code being added in the data flow.The packet handler of separating in the receiver 200 detects initial/stop code, and in response to these yards the data that transmit is separated grouping.
Though previous embodiment is used for the vision signal of TSC-system formula and transmits numerical data in the frequency interleave mode, other embodiment of the present invention also can adopt.Transmissible video data can be for example among the PAL or the signal in the Sequential Color and Memory system formula, the HDTV signal of any rasterisation, or any by the signal of rasterisation.And then, but data analog or digital data, and its transmission and receive form can be synchronous or asynchronous, depend on data transfer rate.A useful especially application of the present invention is to transmit compressed video signal or ACTV signal.
Because embodiments of the invention can be realized High Data Rate, the present invention also is applied to transmit at (5 * 7 Foot) and quality digital figure especially, or transmits greater than the picture of 400 of every Foot, and only needs conventional data compression technique.Transfer of data all or mainly from a source to one or more targets, an example of this system is to transmit the medical science figure or transmit vision signal by radio wave on cable television network.As shown in Figure 5, from an attached chromatographical X-ray scanning machine that helps of X-ray machine device data computer, the conventional compressor reducer 412 that the medical science figure of nuclear magnetic resonance machine or similar machine 410 is used to JPEG or MPEG compresses.The output of compressor reducer 412 is supplied with Transmitter processor 200 as data.Perhaps, input signal can be from high resolution facsimile machine or the graph data of storing in a high-density medium.This video input signals is gone to processor 200, and this signal can be the base band cable TV signal that is used for specific channel, maybe can be the standard base-band television signal by radio wave transmissions.In addition, He Cheng signal via satellite transceiver transmit at a distance.Because the multitude of video channel can use, also the base band video in other roads that can transmit additional figure input with by cable synthesizes.
Replace it, high data rate signal can transmit by a large-capacity communication channel in a direction.The receiver processor 300 that this channel comprises 200, one cable television networks of a Transmitter processor and is positioned at place, a plurality of place.Other data from these places with very low data rate transmission can transmit by the low capacity transmission medium that resembles tv line or mobile phone net and so on.
For example, Fig. 6 shows a two-way embodiment 500, and the graphical data of PCX or tiff format figure and so on can exist in the NetWare file server 502.At least more than one user is by the figure of corresponding modulator-demodulator 508 a-e and telephone network 504 request particular memory in computer 514 a-e.File server receives by multi-thread modulator-demodulator 510 and receives request.The data of the request of figure and so on pass to the tuner 513 that is coupled with at least one receiver processor by Transmitter processor and wired network 512.Ideal situation is to 300 fens multichannels of a processor.Numerical data passes to the port of node computer 514 a-e then for demonstration.In addition, data compressor 412 and compressed software also can be used for being compressed in the data that transmit on the network 512.
Each node computer can be assigned with the address of a uniqueness.The information that transmits on wired network 512 is coded by the address of destination node computer 506 a-e, so that has only a specific node or a group node to receive the information that transmits.
But the example travel agency of network shown in Figure 6 or direct marketing ground, the user of computer 514 a-e can transmit simple command, for example option or select 2 menus on menu.In response to the selection of specific project or submenu, can show that going up the composite signal of showing transmits by computer on network according to the image of selecting.For example, the user can key in name, the Price Range of acceptable accommodation and other standards of wanting the city visited.In response to the information that enters,, just can in the critical field that transmits, select the hotel through the operation of network shown in Figure 6.
In other embodiments, also can realize two-way computer network 600 by the sub-channel that uses cable television network shown in Figure 7, ((ATV) input is coupled by telephone wire 606 or other media, and cable TV node 630 is coupled to cable TV input 610 by cable tv coax network or fiber optic network 608 with cable TV for a plurality of separation magnetic tape station 602.Perhaps, a file service station (not shown) also can become the part of input 610 and replace magnetic tape station 602.
Preferably with having the frame relay stipulations of quick block switch, this can be realized by the mode that adopts a plurality of video channels this network.At least one forward direction control channel of cable television network is delivered to a plurality of cable TV computer nodes 630 to control information with making the control channel.According to passing to cable TV node 630 from input 610 by the existing-quality television channel.Data are by T8, and the so sub-channel of T9 to T10 passes to input 610 from cable TV computer node 630, and the block switch stipulations make multinode 630 share same data channel with the enhancement frame junction network.This network can return channel control with the token bus and the CSMA/CD addressing method of poll.
Fig. 8 shows typical input 612, and special line 606 communicates with tape 612.Each special line is coupled to a CSU/DSU(channel service station/data, services station) 612, this CSU/DSU is applicable to T1 by one or less than the interface of T1 index line, these interfaces can obtain from universal data system (UDS) portion of Motorola Inc..Each CSU/DUS by one such as IEEE RS 449 interfaces or V.35 the bidirectional interface 616 the interface be coupled to network tape 614.The data that 614 controls of this network tape receive from special line are to the distribution of one of video processor 200 of all selections as shown in Figure 3, and each processor 200 also receives baseband video signals from a video 618.The output of this video processor 200 is sent to RF video modulator 620 so that transmit on the coaxial cable 608 of a forward direction cable television channels, RF video modulator 620 can obtain from Atlanta science (Scientific Atlanta).
The network control message that tape 614 generates is sent to forward direction control channel modulator 622 so that transmit on cable tv coax 620.The information that cable TV computer node 630 transmits on sub-channel is by channel demodulation device 624 demodulation of returning and then be added to tape 614.
Frequency cable TV modulator-demodulator can adopt from the EF data of Tempe and the Fairchild data of Scotlsdale and control channel modulator 622 and return channel demodulation device 624 to provide flexibly.
Figure 10 has showed the details of tape.It comprises system controller 614a, backward channel controller 614b, and a plurality of intelligent digital I/O plate 614C, these I/O plates 614C by an IEEE VME after plate be coupled.System controller 614a comprises a CPU (central processing unit) and a hard disk that comprises the systems soft ware of the data call between 612 and the cable TV computer node 630 that is controlled at a plurality of CSU/DSU.Backward channel controller (back channel controller) 614b handles the judgement of transmitting on the cable television network and also the data that cable TV computer node 630 receives is supplied with a plurality of I/O plate 614c.Backward channel controller 614b and system controller 614a are according to suitable stipulations treatment facility fault and data payload condition together in network.
Each I/O plate 614c preferably includes a controller (not shown).The controller that is used for I/O plate 614c can and comprise the self-correcting code that is used for grouped data with packet.This grouped data is supplied to selected video processor 200, in this case, can omit packet handler 200, and then, controller can be separated data grouping and the data that the backward channel controller 614b that comes by video station 630 receives are carried out error correction, similarly, I/O plate 614c is coupled to 612 of CSU/DSU, and its controller can divide into groups to data according to the stipulations of the selected communication of special line 606.
Fig. 9 is the block diagram of the customer station equipment (customer Premise equipment) of cable TV computer installation 630.300, one control channel receivers 632 of the receiver processor of a type shown in Figure 4 and a backward channel modulator are coupled to coaxial cable 608.Data/Video Decoder 300 is received on the forward path and transmits and from the data of tape.Control channel receiver 632 and backward channel modulator 634 are the control channel modulator 622 of input 610 and the complementation unit of backward channel demodulator 634.This control unit comprises a processor controls 300 control channel receivers 632 and returns the microprocessor of channel modulator 634.The control signal designation data that control signal that control unit response receiver 634 receives and frame relay access arrangement interface 638 produce can be for transmitting.In response to the control command that transmits on control channel and control unit 636, the tuner in the processor 300 is transferred to suitable channel, and this is tuning according to carrying out from the control information of tape 614 transmission on the control channel.In addition, control unit 634 provides from the data of video processor 300 receptions and with these data and supplies with frame relay access arrangement interface 638.This frame relay access arrangement interface 638 provides data so that stands 630 digital devices that can be coupled to a computer (not shown) or a local networks (not shown) or any other type at digital I/O 640 places.
By adopting above-mentioned signal processor, synthetic video/data signal can be separated to be in harmonious proportion and be recovered and cause the data of the transmission of visible disturbance when need not to produce television image on video screen by conventional video receiver.The data that transmit also are easy to separate.Be appreciated that the data of supplying with signal processor can be different in many aspects with vision signal, before rasterization process, the correlation of data-signal and vision signal is lower, because these two signals can be uncorrelated fully.Therefore, various data can be transmitted and can be used in the system of one-way communication.But scope of the present invention is defined by the claims.
Claims (38)
1, a kind of being used for adds to raster video Signal Processing device with data-signal, and this raster video signal has colourity and brightness part and scanning and blanking video cycle, and this processor is characterised in that and comprises:
Generate the signal generator of data carrier;
The modulator of modulating data carrier wave is provided in response to this data carrier;
The data-signal and the vision signal in the scan video cycle portions of modulation are made up the synthesizer that composite signal is provided; And
Controlling this modulator makes it to provide the controller of data carrier pulse at the section start in some scan video cycle at least.
2, processor as claimed in claim 1, wherein, the frequency of this data carrier is the non-integer multiplication of this data carrier.
3, processor as claimed in claim 1, wherein, the chrominance section of this vision signal is generated by the modulation of chrominance carrier, and data carrier frequency wherein is greater than the frequency of chrominance carrier.
4, processor as claimed in claim 2, wherein, the frequency in the vision signal on carrier wave has been attenuated basically.
5, processor as claimed in claim 1 wherein, and then comprises:
Synchronizing indicator is used to generate a synthetic synchronizing signal, each blanking of this marker and scan video cycle; And
Clock generator is used to provide the clock signal with respect to the data carrier system; And
Wherein, this controller generates timing controling signal to control the output of this modulator.
6, the data carrier pulse that at least one timing signal causes this modulator to provide also is provided for processor as claimed in claim 5, processor wherein.
7, data-signal is added to have scan video part and blanking cycle, the vision signal of horizontal frequency and luminosity and colourity spectrum, this colourity spectrum has a upper sideband and a lower sideband, and this processor comprises:
Video processor part, this part comprise the device of the vision signal of this colourity spectrum upper sideband of decay and output decay, and the vision signal of this part decay has blanking cycle.
Carrier generator, be used to produce its frequency on top with carrier wave;
Data-signal part, this partial response in data-signal producing an output raster data signal, this output raster data signal have one with the video processor synchronous scan period of blanking cycle partly;
Modulator is used for modulated carrier and raster data signal, thereby the bands of a spectrum energy of this modulator output almost all is positioned within the decay sideband; And
Summer is used for the carrier wave of modulation is added the vision signal that part decays with very low speed.
8, processor as claimed in claim 7, data division wherein also comprise specific Phase synchronization device insertion data-signal to be used for the specific part of this data-signal.
9, processor as claimed in claim 7 wherein also comprises the device of restricting data signal bandwidth.
10, processor as claimed in claim 7, carrier generator wherein provide a carrier wave, and this carrier wave is obtained except that 4 by sweep speed.
11, processor as claimed in claim 7, video section wherein comprises that also an automatic gain control amplifier and one response vision signal provides the DC level restoration of a standardization vision signal that conforms to substantially with a preassigned, and low pass, equalization filter, the frequency of the upper sideband of the colourity spectrum of this signal that is used for decaying.
12, a kind of processor that is used to isolate a Grating Modulation data-signal, this data-signal comprises a Phase synchronization frequency marking that adds a vision signal, this vision signal has a horizontal sweep rate, this raster data signal is arranged in the frequency band part of this vision signal, and this processor is characterised in that and comprises:
A filter, being used to decay does not comprise the spectra part of this data-signal;
A phase-modulated carrier generator is used to generate carrier wave;
A demodulator, it is in response to this carrier wave and filtered data-signal;
Checkout gear is used for the synchronous frequency marking of detected phase; And
Respond the device that detected frequency marking changes the carrier generator phase place.
13, processor as claimed in claim 12, carrier generator is wherein given birth to a carrier wave with 1/4th non-integral multiple volume increase of sweep speed.
14, processor as claimed in claim 12 also comprises:
First tuner has blanking cycle composition composite signal part with providing;
Detector is used to generate a signal to indicate this blanking cycle, and the device that wherein is used for the detected phase frequency marking is in response to this blanking cycle signal, and
Second tuner is used for the composite signal that comprises the spectral energy of data is partly offered filter.
15, a kind of method that transmits data in video network is characterized in that comprising:
Signal with low information content is transmitted a low bandwidth media from first place;
Receive this signal in second place and select a big capacity information that will be sent to second place;
Provide this selection information with High Data Rate;
With synthetic information and the vision signal selected of High Data Rate, this vision signal transmits in video network; And
Receive the information that big capacity transmits in first place.
16, method as claimed in claim 15 is wherein transmitted and the step that receives big capacity information need produce the carrier wave with phase place; This method also comprises:
In Large Volume Data, add a Phase synchronization sign; And
Make the Phase synchronization of carrier wave in carrier phase in the receiver and the conveyer.
17, a kind of method of transmitting information comprises:
Reception is from the information in a source;
With carrier wave of 1/4th non-integral multiple generations of the sweep speed of a rasterisation signal, this signal comprises the spectral energy of colourity and luminosity information;
Modulating the bands of a spectrum energy of carrier wave of this carrier wave so that modulation and colourity and luminosity information based on this information is frequency interleave;
The carrier wave of modulation is added vision signal; And
By cable television network the signal that adds is sent in the channel that comprises vision signal.
18, method as claimed in claim 17 also comprises:
A Phase synchronization sign is added in the modulated carrier.
19, a kind of method that is used for receiving data information, this data message is synthetic by the luminosity and the chrominance information of the grating signal that comprises a scan period, and this data message is modulated by a transmitter data, and this method comprises:
Generate a receiver carrier wave with basic and transmitter data carrier wave same frequency;
This information of demodulation from this signal;
In scan video is capable, determine identification information;
Respond the phase place that this phase identification changes carrier wave.
20, method as claimed in claim 19, data message wherein comprises high-definition image, and this method also comprises:
From data message, remove phase identification; And on suitable medium, show this graphical information.
21, a kind of and vision signal transmits the method for signal together, and this vision signal has a video blanking cycle of determining, these data and vision signal are incoherent substantially, and this method comprises:
Detect the timing of this blanking cycle;
So that provide blanking cycle in this raster data signal, this data blanking cycle is a predetermined space of being longer than the video blanking cycle with the data-signal rasterisation; And
Synthetic video and raster data signal are so that each video blanking cycle is basic and the data blanking cycle begins simultaneously.
22, method as claimed in claim 21 also comprises:
Generate the data carrier pulse;
In composite signal, comprise the data carrier pulse.
23, method as claimed in claim 21 also is included in scan video and inserts 1 of a predefined procedure in the cycle and identify as Phase synchronization.
24, method as claimed in claim 21 comprises also data-signal is divided into group that every group starting and ending is limited by a special code.
25, method as claimed in claim 21, the section start that also is included in each video cycle inserts a Phase synchronization sign.
26, a kind of method that transmits image on cable TV network comprises:
Data carrier of data representation modulation based on image;
The data carrier of modulation is added in the cycle in the vision signal of a channel to form a composite signal at the scan video of vision signal;
On cable network, transmit this composite signal;
Based on this data carrier of scan video cycle demodulation that in vision signal, detects; And and on a display device, show this image.
27, method as claimed in claim 26, the resolution of pictorial data wherein is greater than every Foot 400 points.
28, method as claimed in claim 27, dimension of picture wherein is greater than 5 Foot * 5 Foot.
29, a kind of cable TV facsimile machine is characterized in that comprising:
Scan an image to obtain the device that this visual high-resolution digital is represented;
In response to the device of this scanning means according to a data carrier of numeral modulation; And
The device that the data carrier of modulation is added vision signal.
30, facsimile machine as claimed in claim 29, vision signal wherein have the frequency spectrum of the data carrier of a residual colourity upper sideband and this modulation to be positioned at substantially among this residual sideband.
31, facsimile machine as claimed in claim 29, vision signal wherein have a horizontal scan rate, and this modulating device comprises:
The data carrier generator is used for the data carrier of 1/4th non-integral multiple generations by the video signal level sweep speed, and
The device that is used for forbidden data carrier wave in the blanking cycle of vision signal.
32, facsimile machine as claimed in claim 31 also comprises the device that is used to insert the Phase synchronization sign.
33, a kind of method that on cable television network, transmits data, this television network comprises a medium, plays the tape of a plurality of vision signals in a plurality of forward channels, a control channel and at least one sub-channel, this method comprises:
The data receiver that provides at least one to be coupled to network, and comprise controlled forward channel selection;
Data are added to be used at least one forward channel vision signal to produce a synthetic data/vision signal;
In a forward channel, surpass medium and transmit this data/vision signal;
Receive the data/vision signal of at least one data receiver transmission and mask data from vision signal;
On the control channel, transmit control signal so that control the selection of forward channel by at least one receiver; And
On at least one sub-channel from receiver to the magnetic tape transport data.
34, the method for claim 33, receiver wherein comprise controlled sub-channel selection, and this method also is included in the control channel and uploads feed signals so that at least one receiver is selected a specific sub-channel.
35, method as claimed in claim 34 also is included in Monitoring Data transmission on the sub-channel; Thereby and on sub-channel, transmit data to greatest extent according to the sub-channel selection of Monitoring and Controlling.
36, a kind of being used at the equipment that comprises transmission data on the video network of transmission medium, this network has a plurality of forward channel, a control channel and a sub-channel, and this equipment comprises:
Be used to receive the device of a plurality of vision signals;
Be used to receive the device of at least one data-signal;
The device that is used for the vision signal of a generated data signal and a selection;
Be used for making the device that transmits composite signal at the video channel of selecting;
Be used to receive the device of the data that transmit on the sub-channel;
Be used to monitor the device that data-signal transmits on the sub-channel;
Be used on the control channel, transmitting the device of control signal according to monitoring result.
37, a kind of equipment that transmits data that is received on the cable television network, this network comprises a kind of transmission medium and the forward channel that transmits vision signal arranged, and the vision signal of at least one transmission comprises data, sub-channel and a control channel, and this equipment comprises:
Video receiver with tuner of between forward channel, selecting;
Control channel receiver in response to the control channel;
Tunable sub-channel transmitter, and
The controller of the control signal that transmits on the channel in response to control, this controller are used to change the tuning of the selection of forward channel and sub-channel transmitter.
38, equipment as claimed in claim 37 also comprises the device of extracted data from vision signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94103906 CN1109666A (en) | 1994-03-30 | 1994-03-30 | Improved data with video transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94103906 CN1109666A (en) | 1994-03-30 | 1994-03-30 | Improved data with video transmitter |
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| Publication Number | Publication Date |
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| CN1109666A true CN1109666A (en) | 1995-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 94103906 Pending CN1109666A (en) | 1994-03-30 | 1994-03-30 | Improved data with video transmitter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683653A (en) * | 2013-11-30 | 2015-06-03 | 鸿富锦精密工业（深圳）有限公司 | Clock signal generating circuit and video signal processing circuit |
| CN105391663A (en) * | 2015-10-09 | 2016-03-09 | 浙江大华技术股份有限公司 | Signal transmission method and system |
| CN105611324A (en) * | 2015-12-29 | 2016-05-25 | 上海富瀚微电子股份有限公司 | Analog high-definition video transmission system |
| CN106301453A (en) * | 2016-08-10 | 2017-01-04 | 成都奥克特科技有限公司 | Method for time division transmission of analog signal |
-
1994
- 1994-03-30 CN CN 94103906 patent/CN1109666A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683653A (en) * | 2013-11-30 | 2015-06-03 | 鸿富锦精密工业（深圳）有限公司 | Clock signal generating circuit and video signal processing circuit |
| CN104683653B (en) * | 2013-11-30 | 2018-12-14 | 南宁富桂精密工业有限公司 | Clock signal generating circuit and video processing circuit |
| CN105391663A (en) * | 2015-10-09 | 2016-03-09 | 浙江大华技术股份有限公司 | Signal transmission method and system |
| CN105391663B (en) * | 2015-10-09 | 2018-08-07 | 浙江大华技术股份有限公司 | A kind of method for transmitting signals and system |
| CN105611324A (en) * | 2015-12-29 | 2016-05-25 | 上海富瀚微电子股份有限公司 | Analog high-definition video transmission system |
| CN105611324B (en) * | 2015-12-29 | 2018-09-18 | 上海富瀚微电子股份有限公司 | Simulate high-resolution video transfer system |
| CN106301453A (en) * | 2016-08-10 | 2017-01-04 | 成都奥克特科技有限公司 | Method for time division transmission of analog signal |
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