Method for encoding and decoding signals

FIELD: communications engineering, transmission of images and signals, possible use for simultaneous transmission and receipt of N digital signals in communication equipment.

SUBSTANCE: the method for encoding and decoding signals includes combination of N synchronous digital signals at transmitting side into one multilevel resulting signal S, p-multiple transformation of original multilevel resulting signal S into new multilevel resulting signal Sp by execution of analog-digital and digital-analog transformations of signals in separate serially connected signal processing units. At receiving side, reverse operations are performed with the signals in comparison with the transmitting side.

EFFECT: possible transmission of one or combined transmission of several N synchronous analog television signals of multi-scale images or different digital signals in M-times lesser frequency band of one analog signal, transformed to digital form.

3 cl, 3 dwg, 1 tbl

 

The invention relates to the transmission of images and signals in communication systems. It can be used for simultaneous transmission and reception in the lower frequency band of one of the analog signal converted to digital form, N synchronous analog television signals mnogokriterialnykh images formed by, for example, using TV cameras or other sources of black-and-white, color, spectral, volumetric, or other mnogokriterialnykh images, as well as for joint transmission of N digital signals in communication systems, simultaneous recording and conservation of the N synchronous TV signals mnogokriterialnykh images or other signals, and may find application in video surveillance systems, video conferencing, video on demand, when broadcast television programs, multimedia systems video technology, data transmission systems, the telemetry signal transmission of high-definition television, multispectral TV, TV remote sensing of the Earth's surface and in other systems, when combined transmitting N signals in communication systems.

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:

where k is the number of Voinich characters in code combination of one sample.

On the other hand, what should be the condition under which fd≥2finwhere finthe upper cutoff frequency of the TV signal, the value of which in the first approximation can be represented in the form

where K is the aspect ratio, Z is the number of rows of the decomposition, it·Z2- 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 consider, for example, 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, the chrominance signals EREGEBthe left stereo pair, or the chrominance signals for the left and right stereo pair326 Mbps

436 Mbit/s
Multispectral TV Luggage2≤N≤Dzonal signals EΔλifrom 216 Mbit/s to N×108 Mbps
Color camera high-definition TV (HDTV)according to the 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, which will naturally lead to the need for increased bandwidth with simultaneous transmission of all signals.

As can be seen from table 1, for the considered sources of television signals, in digital form, the actual ways you can reduce the bandwidth of the transmitted radio signals, and in particular for the transmission of HDTV signals with high resolution images, or when sending a large number of si the multispectral channels television in problems of remote sensing of the Earth and other planets. The same problem occurs in communication systems with the joint transmission of a large number of signals when the sources of information used any other known sensors signals that form of analog signals or digital signals, represented in binary code and requiring simultaneous transmission in a smaller frequency bandwidth of the communication channel.

Known systems and methods of transmission of television signals mnogokriterialnykh images (US 6727935, H04N 7/14, 27.04.2004, DE 10249221, H04N 7/14, 06.05.2004, CA 2455501, H04N 7/14, 2003, WO 2004030374, H04N 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 multiplexing 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 many national and international publications, for example, are some of them: see Nowakowski SV, Kotel'nikov A.V. New with the system of the television. 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. - 180 C., Zubarev SHE, Sagdullaev YU.S. Spectral selection of optical images. Publishing house FAN, RUz. Tashkent, 1987 - 108 S. 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 the last paper, on page 35, shows a variant of the structural scheme of the imaging unit of the digital television signal in accordance with Recommendation ITU-R BT 601.

The well-known principles of HDTV systems and methods of compaction signals, and methods for reducing the required bandwidth of the radio channel for HDTV signals (see TV: the Textbook for high schools / Wegame, Aol, Aviruses and others; Ed. by Wegason. - M.: Radio and communication, 2000, 640 S.: ill.)

As the closest analogue of the claimed invention on a set of attributes and operations on the signals accepted method of synchronous transmission of television signals mnogokriterialnykh images (the application to the Patent Vedas is in the Russian Federation dated 11 June 2004 No. 2004117747, the positive decision of 30 may 2005), including on the transmission side processing and transformation of N simultaneous analog TV signals in the N synchronous digital TV 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 d / a conversion N synchronous digital signals, then layered the resulting signal S summarize with the synchronization signal, amplify it and transmit it through the communication channel, and at the receiving side again reinforce multilevel resulting signal S emit from him synchronization signals, generate clock and control pulses, then perform the operation analog-to-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 implement forms is of the N original analog synchronous TV signals mnogokriterialnykh images by digital to analog conversion.

This method provides the joint transmission of N simultaneous analog TV signals in the frequency band of one of the analog signal in digital form. However, the proposed scheme of processing analog signals and adopted a sequence of operations on the signals does not allow for the transfer of one or a joint transfer of N simultaneous TV signals mnogokriterialnykh images in M-times smaller than the frequency band allocated for transmission to one of the analog signal converted to digital form. This limits the application of this method for joint transmission of N signals via the communication channels with less bandwidth.

The technical result - ensuring the transfer of a single or joint transmission of multiple N simultaneous analog TV signals mnogokriterialnykh images or other digital signals in the M-times smaller frequency band of one of the analog signal converted to digital form.

The technical result is achieved due to the fact that in contrast to the known method for synchronous transmission of TV signals mnogokriterialnykh images, including on the transmission side processing and transformation of N simultaneous analog TV signals in the N synchronous digital TV signals by analog-to-digital conversion, combining them in one many of euronavy the resulting signal S by d / a conversion N synchronous digital signals, presented in sequential code, the formation of the digital synchronization signals, multilevel summation of the resulting signal S with the synchronization signal, amplification and transmission over the communication channel, and at the receiving side perform reverse operations on signals, including signal synchronization, clock and control pulses, analog-to-digital conversion result multilevel signal S with the formation of N synchronous digital TV signals in sequential code, converting them into parallel n-bit binary code, the formation of the N original analog synchronous TV signals mnogokriterialnykh images by digital to analog conversion on the transmission side injected the operation of converting the original multi-level of the resulting signal S in new multilevel resulting signal Spby introducing successive R-link M - analog-digital conversion of the signal S, the formation of the digital signals in binary code, the implementation of digital to analog conversion of signals in each link and the formation of new multi-level output signals S1, S2, ... Spwhy is entered, the operation of converting the original multi-level of the resulting signal S into digital form by the first m1- the tax-digital conversion of the signal S using the delayed reference signal to the picture element Δ tefor the second and each subsequent analog-to-digital conversion of signals equal to the time (m1-1)·Δtethen the signals received through the m1- analog-to-digital conversions, represented in N-bit parallel binary code, unite in multilevel resulting signal S1by the first digital-to-analog conversion of the signals, and to perform a join operation, signals are delay signals by an amount equal time (m1-1)·Δtestarting for a group of signals of the first and before the last analog-to-digital conversion for the operation of their simultaneous d / a conversion, then, depending on the desired magnitude M perform the above operations on signals for the newly formed multi-level of the resulting signal S1transform it into a digital form using the second m2- analog-to-digital conversion and receive signals, represented in the m1·m2·N - bit parallel binary code, which unite in a multilevel resulting signal S2by the second digital to analog conversion of signals, and to perform the merge operation signals again are delay signals ve is ichino, equal time (m2-1)·Δtestarting for a group of signals of the first and before the last analog-to-digital conversion, and then carry out the identical R-multiple operations on signals to form the final multi-level of the resulting signal Spand at the receiving side perform operations on the signals back to the transmitter, namely, after analog-digital conversion result multilevel signal Spget N·M signals, then perform M d / a conversions, then from M signals by summing them to form a multilevel resulting signal Sp-1, further perform identical operations on the signal Sp-1and receive the signal Sp-2, then SR-3, ..., Sp-(p-1)to obtain primary multilevel resulting signal S.

Introduction on the transmission side system TV for the original multi-level of the resulting signal S, combining N-analog synchronous TV signals mnogokriterialnykh images or other signals M - analog-to-digital conversions with the offset reference signal for the picture element to a separate analog-to-digital conversion of signals in each group of mj- analog-to-digital conversions, and at the receiving side perform reverse operations is to use the sampling rate of the signal for each individual link of the analog-to-digital conversion, equal to the value of fd/mjthat leads, in accordance with formula (1) to reduce the bandwidth in the M-times needed to transmit the N source signals, represented in the form of multilevel resulting signal Sp.

The value M=(m1·m2·...·mj·...·ms) is equal to the product of the individual links of the analog-to-digital conversions multilevel resulting signal Sjreceived after the previous digital to analog conversions and characterizes the total number of possible analog-to-digital conversions multilevel resulting signal Sp. Each of the values m1, m2, ... mj, ... msmay have its value in the interval numbers 2, 3 ...≤mj<Z2where Z2- the total number of items in the TV image. The rate of conversion of p source multilevel resulting signal S into a new multilevel resulting signal Spsatisfies the values of the numbers 1, 2, 3≤...≤R≤...<Century, When the conversion ratio R=1, the total number of analog-to-digital conversions is determined by using one-level signal processing and is equal to M=m1that may be equal to 2, 3, 4, 5, ...<Z2. When p=2, respectively, the total number of analog-to-digital conversions in two frame link guides the s signal processing will be the value of M=m 1·m2and may be equal to 4, 6, 8, ...<Z2etc. In this application of the iterative scheme signal processing allows to reduce the total number of analog-to-digital converters in each link.

Using known processing operations of the digital TV signals in the proposed new sequences and their use in this way are significant and achieve set goals.

The technical result is achieved due to the introduction on the transmission side processing operations source multilevel resulting signal S on the basis of its p-fold serial M - analog-digital conversion of the signal with the reduced sampling frequency compared to the original digital signals and digital to analog conversions of the signals with the formation of a new multi-level of the resulting signal Spfor subsequent transmission by a communication channel or recording.

To achieve the specified result, we propose a method of encoding and decoding signals, comprising a transmitting side processing and conversion of N-synchronous analog television or other signals by analog-to-digital conversion in the N-synchronous digital signals presented in the parallel n-bit binary code, convert the use of parallel code signals in successive n-bit binary code, where N is the synchronous digital signals are combined into a single multilevel resulting signal S by d / a conversion, the formation of the digital synchronization signal, and the transmitting side before the operation of the multilevel summation of the resulting signal S with the synchronization signal by the R-fold transformation of the original multi-level of the resulting signal S into a new multilevel resulting signal Spby performing analog-to-digital and digital-analog conversions of the signals in the individual series-connected stages of the signal processing, for which the original multilevel resulting signal S is converted into digital form by the first m1- analog-digital conversion of the signal S and the clock pulses that define sampling rate multi-level of the resulting signal S, S1, ... Sj, ... Spdepending on the number of mj- analog-to-digital conversions in each link, have a meaning repetition frequency of clock pulses fd/mjand time of receipt on each analog-to-digital Converter, which uses the delay reference signal for the picture element Δtefor the second and each subsequent analog-to-digital conversion, equal to the belts (m 1-1)·Δtethen m1·N - digital signal represented in binary code, unite in a new multilevel resulting signal S1by the first digital-to-analog conversion of the signals, and to perform a join operation, digital signals provide feedback delay signal by an amount equal time (m1-1)·Δtefrom digital signals of the first and each subsequent analog-to-digital conversion of signals and to the latest analog-to-digital conversion for their simultaneous associations, starting with the first digital-to-analogue conversion and through the formation of multi-level of the resulting signal S1, next, perform identical operations on signals for multilevel resulting signal S1, converting it into digital form and using the second link m2- analog-to-digital conversions using the delayed reference signal to the picture element Δtefor the second and each subsequent analog-to-digital conversion, equal to the time (m2-1)·Δtethen m1·m2·N - digital signal represented in binary code, unite in a new multilevel resulting signal S2by the second digital-to-analogue Converter is ia signals, moreover, since digital signals of the first and each subsequent analog-to-digital conversion of signals and to the latest analog-to-digital conversion is introduced reverse delay signals by an amount equal time (m2-1)·Δtefor simultaneous associations by the second digital-to-analogue conversion and the formation of multi-level of the resulting signal S2, next on the transmission side is identical to the form S3...Sj... and the last signal Sp, followed by the multilevel summation of the resulting signal Spwith the synchronization signal, then it is the amplification and transmission over the communication channel, and at the receiving side performs the inverse operations on the signals, which include strengthening multi-level of the resulting signal Spthe allocation of a synchronization signal and generation of a clock and control pulses, the operation of analog-to-digital conversion result multilevel signal Spobtaining N·M digital signals in binary code, then perform ms- digital to analog conversions (N·M)/ms- digital signals, and to perform operations analog signal transformations perform reverse delay cyfrowy the signals by an amount equal time (ms-1)·Δtestarting with a group (N·M)/ms- digital signals for the latest and up to the first digital to analog conversion of signals, then on the basis of the received signals by summing them to form a multilevel resulting signal Sp-1, further perform identical operations on the signal Sp-1and receive signals Sp-2, then Sp-3, ... Sp-(p-1)and the original multi-level of the resulting signal S, then perform the operation analog-to-digital conversion result multilevel signal S and form N synchronous digital signals in successive n-bit binary 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, followed by digital to analog conversions are forming N source synchronous analog television or other signals.

System for encoding and decoding signals that implements the proposed method for the transmission of TV signals mnogokriterialnykh images (or other signals), contains on the transmission side (Fig 1) N source synchronous television signals 1, clock 2, N-analog-to-digital preobrazovala what she is 3 and N-converters parallel code in serial 4 for each source of television signals, d / a Converter 5, series p-links of analog-to-digital and digital to analog conversion multi-level of the resulting signal S to obtain a signal Sp6, each link of which has connected in parallel on input mj- analog-to-digital converters (ADC)) 7, (mj-1) delay line signals 8 and digital-to-analogue Converter (DAC) 9, shaper synchronization signal 10, an adder 11, an amplifier 12, and at the receiving side (figure 2) amplifier 14, the selector clock signal 15, the clock 16, series p-links of analog-to-digital and digital to analog conversion multi-level of the resulting signal Spto obtain the source signal S, each element of which contains an analog-to-digital Converter 18, (mj-1) delay line signals 19, mj- analog converters 20, the adder signals 21, an analog-to-digital Converter 22, N signal transducers sequential code in parallel 23, N digital to analog converters 24, shaper lowercase and human impulses or other clock 25, N video blocks or other blocks display and registration information 26, and the communication channel 13.

System encoding and decoding signal is, with regard to the transmission of TV signals mnogokriterialnykh images, works as follows. The clock 2 generates the required clock pulses for synchronous operation N sources TV signals 1 and generates the required clock pulses for the N analog-to-digital converters 3 and N-converters code 4 for each TV signal source, the outputs of which are formed of digital signals are represented in successive n-bit binary code. Data signals (in the form of a logical "0" or "1") are fed to the inputs 1, ... j, ... N digital-to-analogue Converter 5, which generates a corresponding output signal level, depending on the values of the signal at its N inputs, namely multilevel resulting signal S. Consider the case when the number of sources TV signal is N=3. In this case, the output digital to analogue Converter 5 will be formed 2Nvalues of the output signal, which characterize a multi-level result signal S. the frequency Band necessary for transmission of the N analog signals into digital form, is determined by the product of the sampling frequency fdanalog signal and the number of binary symbols in one discrete sample k.

The possible combination of the signals at the input of the DAC 5 The signal levels at the output of the DAC 5
000U1
100U2
010U3
110U4
001U5
101U6
011U7
111U8

Let the desired value of the sampling frequency of the original multi-level of the resulting signal S to convert it into digital form is the value of fd=1/T0as shown in figa. If you use the first link (figure 1, box 6.1) processing the input multi-level of the resulting signal S and the number of analog-to-digital conversions, for example, equal to m1=2, the value of the sampling frequency to the first analog-to-digital conversion will be equal to fd/2=1/T1(figb), since T1=2T0and for the second analog-to-digital conversion value of the sampling frequency will be the same, but with a delay pulsing and the pulse on time, equal to t3=T0(pigv). Thus, using a single-level signal processing with two analog-to-digital conversions of the input multi-level of the resulting signal S can be used to reduce the sampling frequency twice and, accordingly, to reduce the required bandwidth of the channel twice, required for simultaneous transmission of N source signals, are combined in a new multilevel resulting signal S1. In General, when using a single-level signal when the rate signal is equal to p=1, the achievable gain in reducing the required bandwidth for transmission of a new multi-level of the resulting signal S1will be the value of m1and may be equal to 2, 3, 4 ...<Z2. When using the subsequent 6.j-level signal processing (figure 1) are identical to the operation for converting the previous multilevel resulting signal Sj-1in the following Sjsignal. The need to add further stages of the signal processing can be driven by the need to achieve large values reduce the required bandwidth. The use of multiple serial links of signal processing, where R>1, more effectively, as this can reduce the required number of anal is the go-digital signal conversion. For example, suppose you want to reduce the necessary bandwidth for transmission of N source signals 100 times. In this case, when p=1, it is necessary to carry out 100 analog-to-digital signal conversion, when p=2, can be used in the first link of m1=10, the second link m2=10 analog-to-digital signal conversion, which will require the use of 20 ADC, when p=3, respectively, m1=5, m2=5 and m3=4, requires only 14 ADC. For the last case, the total reduction of the required bandwidth will be an amount equal to the product of the transformations at the individual stages of signal processing, namely M=m1·m2·m3=5×5×4=100. Thus, the use on the transmission side p - series units of the signal processing, including m1+m2+m3+...+msanalog-to-digital conversions, allows to reduce the sampling rate of the signal in the fd/M times. The clock 2 forms also need a special clock pulse for analog-to-digital converters 3, 7, and code converters 4. For parts of the signal processing 6.1, ... 6.j, ... 6.p, clock pulses that define sampling rate multi-level of the resulting signal S, S1, ... Sj, ... Spdepending on the number of mj- analog-to-digital pre is bratvany in each link, have their values repetition frequency of clock pulses and the time of their admission to each ADC 7. For this purpose, the clock 2 groups of pulses with the same repetition frequency and a certain delay in time, namely the delayed reference signal to the picture element Δtefor the second and each subsequent analog-to-digital conversion, equal to the time (mj-1)·Δte. For simultaneously receiving digital signals from outputs of the ADC 7, each link 6.1, ... 6.j, ... 6.p, to the corresponding inputs of the DAC 9, for forming multilevel resulting signal S1, ... Sj, ... Spbetween them enabled delay line signals 8, and depending on the number of mj- analog-to-digital conversions in each link to perform a join operation, digital signals perform reverse delay (compared with signals generated in the clock 2) by an amount equal time (mj-1)·Δtestarting for digital signals output from the first and each subsequent ADC 7 and to the last ADC, and thereby ensure their alignment over time. As a result of performing these operations on the DAC outputs 9 are formed new multi-level output signals S1, ... Sj, ... Sp. Output after the him DAC 9R S psupplied to the first input of the adder 11, the second input of which receives the synchronization signals generated in block 10, on the basis of the signals coming from the clock 2. From the output of the adder 11 levels resulting signal with the synchronization signal supplied to the amplifier 12 and the next in line (channel) connection 13. Multilevel resulting signal Spoutput lines of communication 13 (2) after appropriate amplification of the second amplifier 14 is fed to the input selector clock signal 15, and also to the input of analog-to-digital Converter R first link R analog-to-digital and digital-analog conversions multilevel resulting signal Spat the receiving side. At the output of the ADC R formed N·M digital signals in binary code, a separate group (N·M)/msdigital signals are sent to the inputs of ms - analog conversions of the signals 20, and to perform operations to analog conversions of signals by the delay of each group (N·M)/ms- digital signals using delay lines 19 by an amount equal time (ms-1)·Δtesince the signals at the last DAC 20msand so to the first DAC 201. Outputs ms- analog converters 20 are formed msDepartment of the multilevel data signals, which after integration in time on the element 21R at its output form a multi-level result signal Sp-1. Further, the signal Sp-1arrives at the following link signal processing 17p-1where, when performing identical operations on the signal Sp-1receive signals Sp-2hereinafter is identical to the outputs of the subsequent stages of the processing of the signals generated signals Sp-3, ..., Sp-(p-1)and the output of the last section 171formed the original multilevel resulting signal S. This signal is fed to the input of the ADC 22, in which the multilevel resulting signal S is converted into N digital signals represented in successive n-bit binary code. For the above example, when the number of source signals is N=3.

The signal levels at the input of the ADC 22The signals at the output of the ADC 22
U1000
U2100
U3010
U4110
U5001
U6 101
U7011
U8111

The output signal of the ADC 22 are received at the inputs of inverters sequential code in parallel 231, ... 23j, ... 23Nthe output signals from the converters come to the appropriate inputs of the DAC 241, ... 24j, ... 24Nat 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 261, ... 26j, ... 26N. The output signal from the selector clock signal 15 is fed to the input of the clock 16. The generator generates the necessary clock and control pulses with a predetermined repetition frequency, which come to the second input of analog-to-digital Converter 18p, ... 18j, ... 181and at 22, to the second input transducers sequential code in parallel 231, ... 23j, ... 23Na signal from the second output of the selector 15 to the input of the shaper lowercase and HR clock 25, with which the clock pulses are received on the second and third input video blocks 261, ... 26j, ... 26sub> N.

In the presented scheme, the encoding and decoding of signals in the transmission of the original TV signals when the value of N≤3, on the transmission side (figure 1) can be excluded converts parallel signals of n-bit binary code in the serial n-bit binary code, which is implemented through the inverter 4, and the formation of the original multi-level of the resulting signal S to be implemented through digital to analog conversion of digital signals are represented in parallel n-bit binary code, and at the receiving side (figure 2), respectively, to exclude the operation signal transformation, presented in sequential code into an n-bit parallel code using Converter 23, while the upper cutoff frequency in the spectrum of the multi-level of the resulting signal S to N source signals will satisfy the condition fin≤fd/2, and for the newly formed resulting signal Spcondition

fin≤fd/2·M, where M≥2.

The exception of the above operations require the condition that the transmission of TV signals, the number of inputs of the digital-to-analogue Converter 5 (Fig 1) must be equal to w=N·k, where N is the number of source TV analog signals, k is the number of binary symbols in a code combination of one sample at the mo is the Finance analog TV signal to digital form. As sources of signals for each ADC input 5 to join them in a single multilevel resulting signal S can also be any other (not TV) synchronous digital signal represented in binary code. In this case, if one two-level digital signal is required to transfer the communication channel with bandwidth equal to Δf, the application of the described method of encoding and combining signals allows you to send w - signals in the frequency band Δf/M and thereby reduce the bandwidth requirements of the communication channel.

The principle of operation and detailed description of the individual nodes and blocks of this system associated with receiving and processing TV signals, converting the signals 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.

1. Method of encoding and decoding signals, comprising a transmitting 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 synchro signals is Itachi, Association of N synchronous digital signals in one multilevel resulting signal S by d / a conversion, multilevel summation of the resulting signal S with the synchronization signal, amplification and transmission over the communication channel, and at the receiving side, including strengthening multi-level of the resulting signal S, the selection of the synchronization signals and the formation of clock and control pulses, the operation of the analog-digital conversion result multilevel signal S and the formation of the N synchronous digital TV signals in sequential code, converting them into parallel n-bit binary code and the implementation of the formation of the N original analog synchronous TV signals mnogokriterialnykh images by digital to analog conversion, characterized in that on the transmitting side before the operation of the multilevel summation of the resulting signal S with the synchronization signal, carry out the R-fold transformation of the original multi-level of the resulting signal S into a new multilevel resulting signal Spby performing analog-to-digital and digital-analog conversions of the signals in the individual series-connected stages of the signal processing, for which the original multi-level results is yuushi signal S is converted into digital form, by the first m1- analog-digital conversion of the signal S and the clock pulses that define sampling rate multi-level of the resulting signal S, S1, ..., Sj, ..., Spdepending on the number of mj- analog-to-digital conversions in each link are set to the repetition frequency of clock pulses fd/mjand time of receipt on each analog-to-digital Converter, which when forming clock pulses using the delayed reference signal to the picture element Δtefor the second and each subsequent analog-to-digital conversion, equal to the time (m1-1)·Δtethen m1·N - digital signal represented in binary code, unite in a new multilevel resulting signal S1by the first digital to analog conversion of signals, and to perform a join operation, digital signals are delay signals by an amount equal time (m1-1)·Δtestarting for the digital signals of the first and each subsequent analog-to-digital conversion of signals and to the latest analog-to-digital conversion for their simultaneous associations by the first digital-to-analogue conversion and the formation of multi-level result the ith signal S 1, next, perform identical operations on signals for multilevel resulting signal S1transform it into a digital form using a second link m2- analog-to-digital conversions using the delayed reference signal to the picture element Δtefor the second and each subsequent analog-to-digital conversion, equal to the time (m2-1)·Δtethen m1·m2·N - digital signal represented in binary code, unite in a new multilevel resulting signal S2by the second digital to analog conversion of signals from the digital signals of the first and each subsequent analog-to-digital conversion of signals and to the latest analog-to-digital conversion is introduced reverse delay signals by the amount equal to the time (m2-1)·Δtefor simultaneous associations by the second digital-to-analogue conversion and the formation of multi-level of the resulting signal S2, next on the transmission side, as may be necessary, is identical to the form S3,..., Sj... and Sp, followed by the multilevel summation of the resulting signal Spwith the synchronization signal, amplify it and transmit over the communication channel, and on zemnoi side again reinforce multilevel resulting signal S pand then it emit a synchronization signal to form a clock and control pulses, then perform the operation analog-to-digital conversion result multilevel signal Spform N·M digital signals in binary code, followed by ms- analog conversions of the signals for the individual groups (N·M)/ms- digital signals, and to perform operations with transformations of the signals are delayed each group (N·M)/ms- digital signals by an amount equal time (ms-1)·Δtestarting with the latest and up to the first digital to analog signal conversion, then after ms- analog signal transformations form msseparate multilevel signals, combine them in time and form a multilevel resulting signal Sp-1, further perform identical operations on the signal Sp-1and receive the signal Sp-2, then Sp-3, ..., Sp-(p-1)and form of the original multilevel resulting signal S.

2. The method according to claim 1, characterized in that on the transmission side when forming the multi-level of the resulting signal S, is the Union of N synchronous digital television or other digital signals, while the total number of similar what-to-digital conversions for the formation of a new multi-level of the resulting signal S pis numerically equal to the value M=(m1·m2·...·mj·...·...·ms), where each of the values m1, m2, ..., mj, ..., mscan take its value in the interval 2, 3 ...≤mj<Z2where Z2- the total number of items in the TV image, and the multiplicity of p conversion of the original multi-level of the resulting signal S into a new multilevel resulting signal Spmay be equal to 1, 2, 3 ...≤R<C.

3. The method according to claim 2, characterized in that during the transmission of TV signals, when the initial number N≤3 and when passing other separate synchronous digital signal represented in binary code on the transmission side can be excluded converts parallel signals of n-bit binary code in the serial n-bit binary code, and the formation of the original multi-level of the resulting signal S is carried out by digital-analog conversion of digital signals are represented in parallel binary code, and at the receiving side, respectively exclude converts signals presented in sequential code into an n-bit parallel code, while the upper cutoff frequency in the spectrum of the multi-level of the resulting signal S to N recognize the different signals will satisfy the condition f in≤fd/2, and for the newly formed multi-level of the resulting signal Spthe condition fin≤fd/2·M, where M≥2.



 

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