SU1317690A1 - Method and apparatus for mutual transmission and reception of spectrum range video signals - Google Patents

Abstract

The invention relates to television and provides an increase in the number of transmitted spectrozonal video signals (VS) in a standard communication channel. The method consists in that the initial spectrozonal BCs are linearly transformed, sampled in time, I discrete BCs are formed from each discrete BC by delaying them by the time t-T multiple of the row frequency period, where Tn is the sampling time. From the formed delayed discrete air lines form 1 air force groups by N in-phase discrete air forces. The first m sun discrete samples of each of the N discrete sun belonging to one group of sun, remember in the form of two-dimensional matrices. Sequences of discrete samples adjacent to each row, column, and diagonal of the matrix are separated from each matrix, temporarily compressed and transmitted are transmitted. When receiving, they perform a temporary separation of aircraft into groups of rows, convert reconstructed aircraft into a sequence of aircraft with a number of rows and columns equal to N and t, and a following period I m-Tj .. From the sequences of the sun form a spectral BS and restore additional aircraft to the first m Sun by interpolation. The resulting BCs are converted to analog form and form the original spectral zone signals by linear conversion. A device that implements the method is proposed. 2 sec. and 1z, p. f-ly, 5 ill. , (L 00 05

Description

The invention relates to a technique of television and can be used in the transmission of wide-band television video signals and in incompatible color television systems.

The purpose of the invention is to increase the number of transmitted spectrozonal video signals in a standard communication channel.

FIG. Figure 1 shows the structural electrical circuit of the transmitting part of the device for joint transmission and reception of spectrozonal video signals; in fig. 2 diagram of the receiving part of the device joint transmission and reception of spectrozonal video signals; in fig. 3 is a diagram of a video signal compression algorithm on the transmitting sideJ in FIG. 4 is a timing diagram of the operation of the memory blocks J in FIG. 5 is a schematic of the time division algorithm at the receiving side.

The transmitting part (FIG. 1) of the device for jointly transmitting and receiving spectral video signals comprises a matrixing unit 1, a unit 2 of analog-to-digital converters (L-1) delay blocks 3-i, where ItitL LN, N is the number of input spectrozonal video signals, L units 4 -i memory, L primary temporal compression block 5-i, control block 6, digital analog converter unit 7, full television signal generating unit 8, temporary compacting unit 9, synchronous generator 10, and auxiliary synchronization unit 11.

Receiving part (Fig. 2), connected

with the transmitting part, the communication channel 12 contains a time division block 13, a switching signal generating unit 14, a sync selector 15, an additional sync selector 16, a program block 17, L units 18-i of restoring video signals of the lines jL blocks 19-i secondary time division L blocks 20- i storing, L-1 receiving delay blocks 21-J, where 1 j L-1, interpolation block 22, block 23 receiving digital-analog converters, block 24 of generating video output signals, block 25 of forming partial video signals and block 26 of receiving analog-digital signals photoelectret.

The device implements the method of joint transmission and reception of spectroscopic

50

video signals as follows.

The original spectrozonal video signals are fed to the inputs of block 1 in strict accordance with the number of the video signal and the number of the input of the block.

In accordance with the algorithm, the original spectrozonal video signals are converted into four spectral zonal video signals with a uniform sampling step over the wavelength X. At the same time, each transformed spectral-local video signal carries information about the adjacent initial spectral-level video signals. Therefore, the converted spectral video signals are depicted in FIG. 3a located immediately in two adjacent spectra; uTi;

From the outputs of block 1, the converted video signals are fed to the inputs of block 2, in which analog video signals are converted into a sequence of video signals of discrete samples, quantized by level. Each analog-to-digital converter (ADC) of block 2 is controlled for implementing the algorithm (Fig. Per 36) clock frequency f t-. At the same time, between each discrete sample video signal there is a discrete sample video signal, containing information about two-adjacent samples, following with the Kotelnikov frequency. Such discrete sample video signals are depicted in FIG. In the form of samples located in two zones of the sampling grid in x (pTa) at once, where T „is 2 / f.,

-y, i, 5

0

0

Q

55

sampling time, In converted spectral video signals, these video signals carry information immediately on a few of the video signals from discrete samples of the original spectral video signals that are sampled at a frequency. I

From the outputs of block 2, video signals in a parallel binary code are fed to a serial connection L-1 of blocks 3-i. For L 2, the number of 3-i blocks is 1. From the input and output of this 3-1 block, two groups of transformed spectral signals are synchronized. These groups differ from one another by a shift by the time tTa.

Both groups of spectral video signals arrive at the corresponding blocks 4-i.

From the N outputs of the 4-L blocks, the video signals are fed to the inputs of the 5-i blocks of the primary temporary seal, where control signals from block 6 produce a temporary seal of discrete video signal samples from the blocks 4-i (-} compressed output signals according to the algorithm explained in FIG. Za b.

The control signals of the write and read modes are generated by block 6.

From the outputs of blocks 5-i, the secondary video signals in the parallel binary code are fed to the inputs of block 7. With two secondary video signals, block 7 has two information inputs and two outputs, i.e. consists of two digital-to-analog converters (DAC), controlled by one clock frequency.

From the output of block 7, the first and second secondary video signals in analog form are fed to the inputs of block 8 to form complete television signals, where they are mixed with damping sync pulses (horizontal and personnel) received from the first output of the synchro-generator 10, as well as additional sync pulses, formed by block 11. Additional synchronization improves the accuracy of analog-digital and digital-analog conversion on transmission and reception, and hence the accuracy of recovery of the ones missed during additional discretization and video signals.

The complete secondary video signals in analog form are fed to the input of the block 9. It is controlled by a signal from the output of the clock generator 10. If this signal has the form shown in FIG. The link will then be alternately connected to the input of channel 12. pass two secondary video signals with alternating groups of three adjacent lines.

From the output of communication channel 12, the compressed video signal is fed to block 13, sync selector 15 and additional sync selector 16.

From the outputs of block 26, the secondary video signals in parallel binary code are fed to the inputs of blocks 18-i. They recover the video signals of the missing lines.

The secondary video signals from the outputs of the blocks 18-i are fed to the inputs of the corresponding blocks 19-i of the secondary time division.

Blocks 19-i work in conjunction with their corresponding blocks 20-i. The operation algorithm of the blocks 20-i at the receiving side is shown in FIG. 4. The control of their work is carried out by signals J formed by the program block 17.

With the arrival of the discrete-count video signal, denoted by 1 (Fig. 4a), the action of the control signal begins to record the signals in blocks 20-i. In this case, the address of the entry is formed in each block 20-i separately. The control signal of the software block 17 controls the block 20-i in such a way that the discrete samples are recorded in the corresponding cells of the block 20-i determined by the write algorithm (Fig. 4d).

ml - p Recording is stopped after strokes (for,, p 2 - after 11 clocks), and block 20-i goes into storage mode. The reading is performed simultaneously in accordance with the address signals (Fig. 46, c). As a result, at the outputs of each block 20-i there is a periodic sequence of matrices (Fig. 4d) with a duration tdd and a period of 2mTj. Moreover, the matrices from the output of the block 20-1 coincide in time with the matrices from the output of the block 20-i. In order to spread the matrices of the first and second sequence in time, the second sequence is passed through blocks 21-j, which hold the video signal of the matrix sequence for the time jmT ,.

but

The time-shifted periodic sequences of matrices (Fig. 5, a, b) are fed to the inputs of block 25. The latter performs the alternate pairwise switching of video signals that match in order of the sequence of two groups of video signals (Fig. 5c). This set is fed to the inputs of block 22.

From the output of block 22, the reconstructed video signals arrive at block 23, where they are converted to analog form. Output video signals are generated from the analogue spectrozonal video signals. This formation is carried out by block 24, similar to block 1,

Claims (1)

Invention Formula 1, A method for jointly transmitting and receiving spectrozonal video signals, including temporal discretization and temporal compression of N spectrodonal video signals by alternating the original spectral video signals by groups of lines, transmitting the compressed signal, receiving it, and temporarily separating the original spectrozonal video signals, in that to increase the number of transmitted spectrozonal video signals in a standard communication channel, before the time sampling, the original spectrum is linearly transformed. Trozonal video signals, from each discrete video signal, form 1 discrete video signals by delaying one relative to another by the time tTa, a multiple of the frequency of the lines, where 1 is 1, 2 ,. . ., L, L - i N, T - sampling time, m 2,3, ..., form from the generated delayed discrete video signals 1 groups of video signals by N in-phase discrete video signals, periodically remember m first video signals of discrete samples from sequences of discrete samples video signals 1-W Dd, each of the N discrete video signals belonging to one video signal group, in the form of two-dimensional discrete sample video signal matrices with the number of rows and columns and Nish, respectively, before temporary compaction izvlechenie from each matrix of the video signal sequence ml - p, where p 1,2,..., video signals of discrete samples, adjacent in rows, columns and diagonal m matrix, which produce a temporary seal, and on the receiving side after the temporary splitting the compressed signal converts the ml - P of the reconstructed video signals into a sequence of video signals with the number of rows and columns being N and T, respectively, and perio-. the following house, the equal l-m T-, form spectral zonal video signals from sequences of video signals, restore additional to m first video signals in each transformed spectral zonal video signal, discrete signals 1317690, 6 interpolation, convert the received video signals to analog form and form the original 5-spectral video signals by linear conversion, 2, -A method according to claim 1, which differs from the fact that, before being transmitted, additional synchronization signals are generated in the sequence of discrete samples, and when received by additional synchronization signals, the time division frequency is controlled. J5 3. A device for the joint transmission and reception of multispectral video signals, which contains on the transmitter side a synchronous generator, the first and second outputs of which are connected to 20 synchronization inputs, respectively, of a complete television signal generation unit and a temporal compression block, whose information inputs are connected to the corresponding 25 outputs of the block of formation of full television signals, the output of the temporary separation unit through the communication channel is connected at the receiving side to the inputs of the temporary separation unit 30 and a sync selector, the output of which is connected via a switching signal generating unit to the control input of the time division unit, characterized in that 35 the purpose of raising the number of transmitted spectrozonal video signals in a standard communication channel, a matrix unit is entered and in series on the transmitting side, 40 block of analog-to-digital converters (L - 1) delay blocks, where L is N, N is the number of input spectrozonal video signals, the first memory block, the first block of the primary menus and the block of digital-analog converters whose outputs are connected to information inputs of the unit for generating full television signals, 2Q (L 1), memory blocks, (L-1) primary time seal blocks, a control unit and an additional synchronization unit, the input of which is connected to the control inputs, are entered 5 blocks of analog-digital converters, delay blocks, memory blocks, a block of digital-analog converters and connected to the first output of the control unit, the second and third you The purpose of increasing the number of transmitted pectrosonal video signals in a standard communication channel, on the transmitting side, a matrix unit is inserted and sequentially connected, an analog-to-digital converter unit (L - 1) delay units, where L is N, N is the number of input spectrozonal video signals, the first memory block, the first block of primary time multiplexing and the block of digital-analog converters whose outputs are connected to the corresponding information the inputs of the full television signal generation unit, (L 1), memory blocks, (L-1) primary time consolidation blocks, a control unit and an auxiliary synchronization unit, whose input is connected to control inputs analog-to-digital converters, delay blocks, memory blocks, digital-analog converters block and connected to the first output of the control unit, the second and third outputs of which are connected to the corresponding additional inputs of the memory blocks, the fourth output of the control unit is connected to the control inputs of the primary temporary seals, the information inputs of which are connected to the corresponding information outputs of the respective memory blocks, the information inputs of the L-ro memory block, where 1 1: L, connected to the corresponding inputs of the (i - 1) th delay block, the output of the additional synchronization block is connected to the auxiliary sync input of the complete television signal generation unit, and at the receiving side a block of analog-to-digital converters, 1 circuits, are included, in series - the generation of video signals of the lines, the block temporal division and the storage unit; the block of the formation of incomplete video signals, the interpolation unit, the receiving center IF analog-to-analog converters and a video output signal shaping unit, an additional sync selector and a software block are introduced, the first output of which is connected to the control inputs of the receiving analog-digital converters block, interpolation block, receiving digital-analog converters block, video line recovery blocks and the first control inputs of memory units, the second and third control inputs of which are connected respectively to the second and third outputs of the program block, fourth output The program block is connected to the control (inputs of the secondary time division blocks, the information outputs of the memory block of the first circuit are connected to the corresponding inputs of the incomplete video signal generation block directly, and the information outputs of the memory blocks of the second and subsequent chains through the input receive blocks of delays connected via an additional sync selector to the input of the program block, the fifth output of which is connected to the control input of the shaping unit is incomplete video, data inputs of video lines reduction units are connected to the respective outputs of the receiving unit of analog-digital converters whose information inputs are connected to the respective outputs of the block time division. .one Зъ / f.a FIG. I  xUTo I 3 UK s  7 37 6, I 7 I (/ TC Gf CpU2. Compiled by A.Prozorovsky Editor V.Kovtun Tehred V.Kadar Proofreader L.Pilipenko Order 2437/56 Edition 638 Subscription VNI-ITI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. five