Method for transferring synchronous television signals of multi-gradation images

FIELD: technology for transferring images, can be used for concurrent transmitting and receiving within frequency band of one digital television image signal, N synchronous television signals of multi-gradation images, formed using, for example, television cameras or other sources of black and white, colored, spectrum-zonal, volumetric, or other multi-gradation images, and also can be used for concurrent recording and conservation of N synchronous television signals of multi-gradation images, and can be possibly utilized for construction of video-surveillance systems, television systems for remote probing of Earth surface and multimedia video-information transfer systems.

SUBSTANCE: method for transferring synchronous television signals of multi-gradation images includes, at transferring side, operations for processing and transformation of N synchronous analog television signals to N synchronous digital television signals, by means of their analog-digital transformation, forming of digital synchronization signals, transmission of signals via communication channel, and at receiving side, reversed operations over signals are performed to in comparison with transmitting side, during which after forming of digital synchronization signals, aforementioned signals are joined as one multi-level resulting signal S by means of analog-digital transformation of N synchronous digital signals, further, multi-level resulting signals S is added to synchronization signal, amplified and transferred along communication channel, and at receiving side multi-level resulting signal S is amplified, then synchronization signals are separated from it, controlling and clock pulses are formed, then, operation of analog-digital transformation of multi-level resulting signal S is performed and N synchronous digital television signals are formed in serial code, after that, operations over signals are performed, being reversed relatively to those at transferring side, namely, each digital signal, represented by serial code, is transformed to parallel n-byte binary code, then, forming of N source analog synchronous television signals of multi-gradation images is performed by means of their digital-analog transformation.

EFFECT: possible concurrent transmission of N synchronous analog television signals of multi-gradation images within frequency band of one analog signals, transformed into television form.

2 dwg, 1 tbl

 

The present invention relates to the field of image transfer and can be used for simultaneous transmission and reception in the frequency band of the digital television image signal, N synchronous television (TV) signals mnogokriterialnykh images formed by, for example, using TV cameras or other sources of black-and-white, color, spectral, volumetric, or other mnogokriterialnykh images. It can also be used for simultaneous recording and conservation of the N synchronous TV signals mnogokriterialnykh images, and find application in video surveillance systems, TV systems, remote sensing of the Earth's surface and multimedia systems video technology.

The speed of transmission of TV signal in digital form is equal to the product of the sampling frequency fdand the number of binary characters in the same discrete reference:

C=fink(1)

where k is the number of binary symbols in a code combination of one sample taken equal to 8, to transfer the maximum possible number of gray scales is really distinguished by the observer in the image, i.e. m=2k=256.

On the other hand, it is known that fd≥2finwhere finthe upper cutoff frequency of the TV si is Nala, which in General is defined as

fin=KZ2n/2,(2)

where K is the aspect ratio, Z is the number of rows of the decomposition, KZ2- the total number of elements of the decomposition in the TV image, n is the number of transmitted frames per second.

According to table 1 examine the main types of sources of television signals, in which the primary signals are generated in analog form.

Table 1
Sources TV signalsThe number of primary analog signals (N)Name analog signalsBasic rate digital TV signal without compression (C)
Black-and-white TV camera1luminance signal EY108 Mbit/s
Color TV cameraaccording to the classical scheme - 3the chrominance signals EREGEB216 Mbit/s
Black and white Luggage dimensional television2luminance signal EYfor the right and left stereo216 Mbit/s
Color camera dimensional television4 or 6luminance signal EYright stereo pair of chrominance signals E REGEBthe left stereo pair, or the chrominance signals for the left and right stereo pair326 Mbps 436 MB/s
Multispectral TV Luggage2≤m≤dzonal signals EΔλifrom 216 Mbit/s up to m×108 Mbps
Color camera high-definition TVno classical scheme - 3the chrominance signals EREGEB1 Gbit/s

For the solution of certain problems of the transmission of video information can be used to separate sources of television signals, are shown in table 1, or jointly by several sources. The total number of primary analog signals may be equal to N, where N≥2, which will naturally lead to the need to increase bandwidth when transmitting N signals in digital form.

Known systems and methods of transmission of television signals mnogokriterialnykh images (US 6727935, H 04 N 7/14, 27/04 .2004, DE 10249221, H 04 N 7/14, 06.05. 2004, SA 2455501. H 04 N 7/14, 2003, WO 2004030374, H 04 N 7/14, 08.04.2004). However, these methods assume the availability of broadband transmission channel.

Know basic principles of digital TV systems and signal processing, such as component digital encoding on the basis of the analog multi the complexation signals, and hybrid multiplexing components of the signals or component digital encoding on the basis of their digital multiplexing (see Ptacek M Digital television: Theory and technique/Lane. with the Czech. Edited Lsilent. - M.: Radio and communication, 1990. - 528).

There are also known methods of forming, processing and transmission of digital TV signals, which are reflected in a large number of domestic and foreign publications, for example, are some of them: see Nowakowski SV, Kotel'nikov A.V. New TV system. Digital methods of processing video signals. - M.: Radio and communication, 1992. - 88 C., Digital processing of television and computer images, Ed. Ubobaruv and Wppdicch. - M.: international Centre for scientific and technical information, 1997. - 212 C., Digital television/ edited Nshmyrev. - M.: Hot line - Telecom, 2001. - 180C., Sagdullaev US, Abdullayev D.A. Smirnov fundamentals of television control process of convergence spacecraft. Tashkent: Izd-vo "FAN", RUz, 1997, 127s., Detection of optical images. /Under the General editorship Jussawalla, Ustinova, Tashkent, 2000 - 315 S., and Smirnov, A.V. fundamentals of digital television: a Training manual. - M.: Hot line - Telecom, 2001. - 224 S.: ill.). In recent work, p.35 option presents a structural diagram of the imaging unit of the digital television signal with the availa able scientific C of Recommendation ITU-R BT 601.

This shaper is shown in figure 1, the signals of the primary colors of EREGEBwith a source of television signals (color TV camera) first received by the gamma corrector (CC)formed in which the signals E'RE'GE'Bin the coding matrix (KM) on the known ratio is converted into the brightness signal E'Yand color difference signals E'R-Yand E'B-Y. Further, these signals are converted by the ADC into digital signals Y, CRand CBrespectively. On the ADC inputs are optional analog nodes, performing the scaling and shift signals. The number of digits of each ADC, typically equal to 8, which generates pulses with a frequency of 27, 13,5 and 6.75 MHz received at the other node device. The GTI contains a diagram of the phase-locked loop (PLL), which provides the required number of periods of the clock pulses for the period of the line scan of the source of television signals. The multiplexer (MS) in sequence passes on the digital signals Y, CRWithBand digital signals. As a result, the output of the device is formed of a digital television signal (CTS) in sequential code.

As the closest analogue of the claimed invention on a set of attributes and operations on si what Nala adopted the shaper digital TV signals of the color images, presented in figure 1. Source TV signals of the color images it displays on the transmission side the following sequence of operations on signals of image formation from the original three analog TV signals of primary colors EREGEBone of the luminance E'Yand two color-difference signals E'R-Yand E'B-Yfurther , converting them into digital form by performing the operations of their analog-to-digital conversion, multiplexing of the digital brightness signal Y, and two color-difference signals CRand CBand separately formed digital signals for subsequent transmission over the communication channel in sequential code. In the receiving part of the TV system is carried out reverse conversion of signals with the formation of the original analog TV signals EREGEBand synchronization signals. The data rate for a particular TV system is determined by the sampling frequency of the analog signals and the number of received bits analog-to-digital conversion of the source signals and parameters used for the decomposition of images, formulas (1) and (2).

It is considered scheme of processing of analog signals to generate digital TV signals and adopted the sequence of operations does not allow sovmestnoe the transfer of N simultaneous analog TV signals mnogokriterialnykh images in the frequency band of one of the analog signal, converted into digital form. In this case, if the luminance signal Y in digital form requires a data rate of 108 Mbps, then adding the required two digital color difference signals WithRand CBrequires increased data transfer rates up to 216 Mbps, which is one of the disadvantages of this method of signal processing of color television.

The technical result - the provision of joint transmission of N simultaneous analog TV signals mnogokriterialnykh images in the frequency band of one of the analog signal converted to digital form (in the frequency band of one of them in digital form).

The technical result is achieved by the fact that in contrast to the known method of processing multiple analog synchronous TV signals mnogokriterialnykh image forming luminance Y and two color-difference signals CRand CBin digital form by analog-to-digital conversion, multiplexing the digital brightness signal Y and two color-difference signals WithRand CBand separately formed digital signals for subsequent transmission over the communication line in the sequential code in the transmitting side instead of the operation of the multiplexing signals used their operation digital-to-analog conversion, rez is ltate what digital brightness signals and color difference signals are combined into one multi-level signal S prior to their transmission over the communication channel, further, the multilevel signal is summed with the synchronization signal, after which it enhance and transmit over the communication channel, then at the receiving side reinforce multilevel signal S emit clock signals and provide feedback analog-to-digital conversion of the multilevel signal S to form N-source digital TV signals in sequential code, and then based on them have a known reverse of the transmitting-side operations on signals, namely form the synchronization signals, each digital signal serial code is converted into a parallel n-bit binary code, and then using their feedback digital-to-analog conversion, form N source analog synchronous TV signals. Introduction on the transmission side TV system operation digital-to-analog signal conversion allows you to concatenate the N digital TV signals into a single multi-level signal S, a use on the receiving side reverse operation analog-to-digital conversion of the multilevel signal S provides its division into N source digital TV signals in sequential code.

Using known processing operations of the digital TV signals in the proposed new sequences and their use in this way are essential and ensure the achievement of the settlement of allenou purpose.

The technical result is achieved by combining on the transmission side N digital TV signals in one multilevel signal by adding the signal processing on the basis of the digital-to-analog conversion of signals for subsequent transmission over a communications line or video.

To achieve the specified result, it is proposed a method for synchronous transmission of television signals mnogokriterialnykh images, including on the transmission side processing and transformation of N simultaneous analog television signals in the N synchronous digital television signals by analog-to-digital conversion, the formation of the digital synchronization signals, the signal transmission over the communication channel, and at the receiving side are inverse operations on signals in comparison with the transmitting party, in which after the formation of the digital synchronization signals carry them together in one multilevel resulting signal S by a digital-to-analog conversion of N synchronous digital signals, then layered the resulting signal S is summed with the signal synchronization, amplify it and transmit over the communication channel, and at the receiving side again reinforce multilevel resulting signal S, then from it produce synchronization signals and generate clock and control of the Commissioner pulses, then perform an operation of the analog-digital conversion result multilevel signal S and form N synchronous digital TV signals in sequential code, and then perform the reverse of the transmitting-side operations on signals, namely, each digital signal represented in the sequential code is converted into a parallel n-bit binary code, and then carry out the formation of the N original analog synchronous TV signals mnogokriterialnykh images by digital-to-analog conversion.

So, for example (see table 1), if it is necessary to transmit signals volume black-and-white TV, where the number of input analog signals is N=2, the use of the transfer method will allow you to pass information volume black-and-white TV in the frequency band of one of the analog signal in digital form. The gain in the reduction of bandwidth for this case will be equal to two. In the case of multispectral channels, when the number of primary signals can be significantly more win would make the quantity 2≤m≤d.

The transmission system of N simultaneous TV signals mnogokriterialnykh images (figure 2) in the frequency band of one of them in digital form that implements the proposed method for the transmission of N simultaneous TV signals, contains on the transmission side (figure 2, a) N source is TV signals 1, the clock 2, N analog-to-digital converters 3, N converters parallel code in a sequential 4, digital-to-analog Converter 5, an adder 6, the amplifier 7, and at the receiving side (figure 2, b), the amplifier 9, the selector clock 10 clock 11, the analog-digital Converter 12 N signal transducers sequential code in parallel 13. N digital-to-analog converters 14, shaper lowercase and HR clock 15, N video blocks 16, and the communication line 8.

System synchronous transmission of TV signals mnogokriterialnykh images works as follows. The clock 2 forms necessary lowercase and HR clock pulses for synchronous operation N sources TV signals 1 and generates the required clock pulses for N analog-to-digital converters 3 and N converters code 4, the outputs of which are formed of digital TV signals, presented in a serial binary code. Data signals (in the form of a logical "0" or "1") are fed to the inputs 1,...j,...N digital-to-analog Converter 5, which generates a corresponding output signal, depending on the values of the signal at its N inputs. Consider the case when the number of sources TV signal is N=3. In this case, you the ode digital-to-analog Converter 5 will be formed 2 Nvalues of the output signal.

The possible combinations of signals at the input of the DACThe signal levels at the output of DAC
000U1
100U2
010U3
110U4
001U5
101U6
011U7
111U8

The output signal of the digital-to-analog Converter 5 through the adder 6 and the amplifier 7 is fed to the input of the communication line 8. The synchronization signals generated by the clock 2, summed over time with multi-level result signal from the DAC output. Multi-level result signal output from the communication line 8, after appropriate amplification of the second amplifier 9 is fed to the input selector clock signals 10 and to the input of analog-to-digital Converter 12, in which the multilevel signal is l is converted into N digital signals, presented in a serial binary code. For the above example, when N=3

The signal levels at the input of ADCThe signals at the ADC output
U1000
U2100
U3010
U4110
U5001
U6101
U7011
U8111

The signals from the outputs of the analog-to-digital Converter 12 receives the inputs of the converters sequential code in parallel 131,...13j,...13Nthe output signals from which are received in corresponding inputs of a digital-to-analog converters 141,...14j...14Nat the exit of which are formed the source of the N analog synchronous TV signals mnogokriterialnykh images, which then serves for informational inputs video blocks 161,...16 j,...16N.

The signal output from the clock selector signal 10 is fed to the input clock pulse 11, which generates the necessary clock and control pulses with a predetermined repetition frequency, which come to the second input of the analog-digital Converter 12, to the second input transducers sequential code in parallel 131,...13j,...13Nand the signal from the second output of the selector 10 to the input of the shaper lowercase and HR clock 15, with which the clock pulses are received on the second and third input video blocks 161,...16j,...16N.

The principle of operation and detailed description of the individual nodes and blocks of this system associated with receiving and processing TV signals, converting them into digital form, synchronization and scanning, transmission and display of video information can be found in the relevant sections of the book: Television: Textbook for universities/ Wegame, Aol, Aviruses and others; Ed. by Wegason. - M.: Radio and communication, 2000, 640 S.: ill.

The transmission method synchronous television signals mnogokriterialnykh images, including on the transmission side processing and transformation of N simultaneous analog television signals in the N synchronous digital television signal is Alov by analog-to-digital conversion, the formation of the digital synchronization signals, the signal transmission over the communication channel, and at the receiving side are inverse operations on signals compared to the transmitting side, characterized in that after the formation of the digital synchronization signals carry them together in one multilevel resulting signal S by d / a conversion N synchronous digital signals, then layered the resulting signal S summarize with the synchronization signal, amplify it and transmit over the communication channel, and at the receiving side again reinforce multilevel resulting signal S, then from it produce synchronization signals and generate clock and control pulses, then perform the operation analog-to-digital the multilevel conversion of the resulting signal S and form N synchronous digital TV signals in sequential code, and then perform the reverse of the transmitting-side operations on signals, namely, each digital signal represented in the sequential code is converted into a parallel n-bit binary code, and then carry out the formation of the N original analog synchronous TV signals much tonal images by digital to analog conversion.



 

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