SU803129A1 - Device for transmitting and receiving images in stereo colour television system - Google Patents

Description

(54) TRANSMISSION AND RECEPTION OF IMAGES IN THE STEREO COLOR TELEVISION SYSTEM However, in such a device there is a distortion of the distortion between the stereo pair signals. The purpose of the invention is to eliminate cross-section distortion between stereopair signals. This is achieved by the fact that in the device for transmitting and receiving images in a stereo color television system, on the transmitting side, there is a transmitting tube of the left image of the stereo pair and a transmitting tube of the narrowband right image of the stereo pair, and the outputs of the red, blue and green signals of each of the transmitting tubes of the stereo pair are connected to the corresponding the input of the corresponding matrix of the left signal and the right image signal, and the first and second outputs of each of the two transformation matrices the left and right image signals are connected respectively to the first and second inputs of the first and second row switches, respectively, the output of the first and second row switches are connected respectively to the first and second inputs of the first field switch, the output of which is connected to the first input of the subcarrier frequency generator, the third output of the right image conversion matrix is connected to the second input of the subcarrier frequency generator, and also containing the serially connected Amplitude modulator and transmitter, and on the receiving side containing a receiver, the output of which is connected to the input of a bandpass filter, the output of which is connected to the input of the first delay line, also containing the second delay line, the first, second and third synchronous detectors, and the inputs of the first and second synchronous detectors are interconnected, and the outputs of the second and third synchronous detectors are connected respectively to the first and second inputs of the first row switch, the first output of which is connected to the first input of the mat The green output of the color difference signal and the first input of the field switching unit, and the second output of the first row switch are connected to the second input of the green color difference matrix and the second input of the field switching unit, while the output of the green color difference matrix is connected to the third input of the field switching unit The second and third field switches, the third and fourth row switches, and the low-pass filter are introduced on the side, with the third output of the left image signal conversion matrix It is connected to the input of the second field switch, the first output of which is connected to the input of the third row switch, the first output of which is connected to the first input of the amplitude modulator, and the second output of the second field switch is connected to the second output of its third row switch and to the input of the low-pass filter, output which is connected to the second input of the amplitude modulator, in addition, the output of the subcarrier frequency generator is connected to the input of the third field switch, the first output of which is connected to the third input of the amplitude modulus Pa and the output of the fourth row switch, and the second output of the third field switch is connected to the input of the fourth row switch, and the second, third, fourth and fifth row switches, first, second, third and fourth field switches, the third and a fourth delay line, a low-pass filter and an adder, the receiver output being connected to the input of the first field switch, the first output of which is connected to the input of the second line switch, the first output of which is connected via a second delay line with the second input of the adder, the second input of which is connected to the parallel second outputs of the first field switch and the second row switch through a low-pass filter, and the output of the fourth field switch is connected to the control input of the first row switch, while the output of the bandpass filter is connected to the input of the second field switch, the first output of which is connected to the input of the third row switch, the second output of the second field switch, the output of the third row switch and the first output of the fourth row switch with interconnected and connected to the inputs of the first and second synchronous detectors, and the output of the first delay line is connected to the input of the third field switch, the first output of which is connected to the input of the third synchronous detector and the output of the fifth row switch, and the second output of the third field switch is connected to the input of the fourth row switch and the input of the third delay line, and the second output of the fourth row switch connected to the third input of the adder, the output of the third delay line connected to the first input of the fifth comm tator directly, and with the second input through the fourth delay line. FIG. 1 shows a structural electrical circuit of the transmitting side of the device; in fig. 2 - the same receiving side; in fig. 3 shows the spectra of transmitted signals; in fig. 4 - spectra of the left and narrow-band right images of a stereo pair. The device for transmitting and receiving images in the stereo color television system contains on the transmitting side the transmitting tube I of the left stereo pair, transmitting the tube of the narrowband right image. Stereo pairs 2, matrixes 3 and 4 of the conversion of left and right images, first and second switches 5 and 6 lines, first switch 7 fields, generator 8 subcarrier frequency, amplitude modulator 9, transmitter 1.0, second switch 11 fields, third switch 12 lines, low pass filter 13, third switch 14 fields and even Vertical commutator 15 lines, and on the receiving side receiver 16, bandpass filter 17, first, second, third and fourth lines 18, 19, 20 and 21 delays, first, second, third and fourth switches 22, 23, 24 n 25 fields , second, third, fourth and fifth switches 26, 27, 28 and 29 lines, first, second and third synchronous detectors 30, 31 and 32, low-pass filter 33, first switch 34 lines, green color difference matrix 35, block 36 field commutators and adder 37.

The device operates as follows. For odd lines of odd fields, the first input of the amplitude modulator 9 is supplied from the output of matrix 3 by a wideband luminous signal Y, the left stereo pair image passing through the second switch 11 fields and the third switch 12 lines (Fig. 3.a, I field). On the second and third inputs of the amplitude modulator 9, no signals are received at this time. During the even-numbered lines of this field, the signal passes through the same blocks and from the second output of the third switch 12 lines enters the low-pass filter 13, which is limited in band to about 3 MHz, and is fed to the second input of the amplitude modulator 9. At the same time the time to its third input comes from the generator 8 subcarrier frequency, passing the third switch 14 fields and the fourth switch 15 lines. In subdisc generator 8, the frequency located outside the spectrum of the frequency-limited signal Ul is simultaneously modulated (for example, in NTSC or PAL systems) by two signals — a narrow-band brightness Yn of the right stereo pair output from the matrix 4 and one of the color difference signals of the right image: (R-V) p in line p-1, (V-V) (, in line p-1, etc., passed the second switch 6 lines and the first switch 7 fields. As a result, carrying the frequency of the television signal in the amplitude module torus 9 during even mode lines It is detected by a signal whose spectrum is shown in Fig. 36, d, field I. The second switch 6 is controlled by quarter-line signals. During even fields the signal Y from the matrix 3 is sent to the amplitude modulator 9 through the second switch 11 and a low-pass filter 13, in which it is limited by the band in each line to about 3 MHz. At the same time, the third input of the subcarrier frequency arrives at the third input of the amplitude modulator 9 from generator 8

through the third switch 14 fields. In subdivision generator 8, the frequency, as in odd fields, is simultaneously modulated by two signals: a narrow-band brightness Yn of the right image and alternately through a line with one of the color difference signals of the left image coming from matrix 3 through the first switch of 5 lines and the first switch of 7 fields (see Fig. 3, II field). The signal compressed in frequency is fed to the transmitter 10.

On the receiving side, the video signal is formed at the output of receiver 16. For odd lines of odd fields, the signal L from the output of receiver 16 passes the first switch 22 fields, the second switch 26, lines, the second delay line 19 enters the second input of the adder 37 and appears at the output of the latter (see Fig. 4, a, b, I field). During the even-numbered lines, the signal from the output of the receiver 16 passes the first switch 22 fields and the second switch 26 0 lines And through the low-pass filter 33 enters (in the 0-3 MHz band) to the first input of the adder 37 (see Fig. 46, d). At the third entrance of the last at this time, there is a shortage. e high frequency1. Components

in po.os .V - About ..iiu,). which are highlighted

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nc; iocosbiM phil-line 1 / from the signal of the previous (n-2) -th line and pass the nepBvr delay 18 (per line), the tertiary switch 24 fields and the fourth switch 28 lines (see Fig. 46, d, delayed

bj-components are shown by a dashed line). Thus, on the receiving side, the formation of a wideband luminance signal of the left image in odd fields occurs.

At the same time, the right image is transmitted in color. Consider receiving a signal in the (n-1) -th line. From the receiver 16, the modulated subcarrier passes a band-pass filter 17, a second switch 23 fields,

the third switch is 27 lines and is fed to the first and second synchronous detectors 30 and 31; a narrowband RF signal is produced at the output of the first and a color difference signal at the output of the second; R-Y signal (see Fig. 4, e) Missing B-signal

formed at the output of the third synchronous detector 32 by detecting the subcarrier (p-3) -th row, which passed the band-pass filter 17, the first delay line 18 (per line), the third switch 24 fields,

the third delay line 20 (per line) and the fifth switch 29 lines. In the p-th line (see Fig. 4, g), the signal of the (n-1) -th line is repeated by delaying another line with the fourth delay line 21. R-V and V-V signals from the outputs of synchronous detectors 31

and 32 arrive at the first switch of 34 lines, which in odd fields controls the signal of a quarter-line frequency, which comes through the fourth switch of 25 fields. In matrix 35, the G-Y signal is generated by the well-known expression

G-Y -0.51 (R-Y) -0.19 (BY).

On the first, third and fifth outputs of the field switching unit 36, color-difference signals of the right image appear.

Consider the reception of the left and right images of the stereo pair for even fields (see Fig. 4, field II). From the successor 16, the signal passes the first switch 22 of the fields, the low-pass filter 33, in which the signal Xn is extracted, the adder 37 and appears at the output of the receiving side in the O-3 MHz band (see Fig. 4a, b. C. ). At the same time, the band-pass filter 17 separates from the received signal a modulated subcarrier that passes the second field switch 23 and enters the first and EGGora synchronous detectors 30 and 31. As a result, a narrow-band right-of-band signal is produced at the output of the first in each row (see Fig. 4 d, g, 3.11 field), and at the output of BTOpoio - color difference signal RY). The BY signal is formed at the output of the third synchronous detector 32 due to the delay of the subcarrier (p-3) -th line by the first delay line i8 ( per line), passing it through thirds A second field switch 24, from the second output of which it enters a synchronous detector 32. The signal is generated in matrix 35. On the second, fourth and sixth outputs of block 36 of field switches, there are three color difference signals of the left image.

Thus, in the proposed device, the left image in odd fields is transmitted in a wide frequency band, the missing high-frequency components in the (n-1) -th and (n + 1) -th lines are taken from the previous (n-2) -th and n -th lines by selecting a band-pass filter and a delay per line (in Fig. 4b, g are shown by a dashed line), and in even fields, in a reduced frequency band (approximately to 3 MHz). In this case, the reproduced image is perceived with a quality close to the best. This principle of transmission allows the left image to be transmitted in even fields in color with the same quality as in the SECAM system (color difference signals are transmitted through the line in Fig. Za, b, v. D, field II).

The right image is transmitted in color in odd fields with slightly worse quality (vertical clarity) than the left one in even fields, since the color difference signals are transmitted through two lines, and the capacitive signals through a line (see Fig. 36, d, I field and Fig. 4 d, g, s, I field). In even fields, the right image is transmitted and reproduced in black and white in a shortened frequency band. If the quality of the left n

Since the right image is different, the stereo image quality approaches the best of them. Therefore, in this device the properties of the visual system are most fully used for transmitting

and receiving stereo-color television images without cross-distortion between the signals and with the quality of black-and-white and color images approaching the quality of, respectively, two-dimensional black-and-white and color television systems.

Claims (1)

Invention Formula A device for transmitting and receiving images in a stereo-television system, containing on the transmitting side the transmitting tube of the left image of the stereo pair and the transmitting tube of the narrowband image of the hundred image of the stereo pair, the outputs of the red, blue and green signals The colors of each of the transmitting tubes are StrOnOr 1SDyuzh; ChS1Y s fC to the corresponding input: answer; Osh, its left and right image signal conversion matrix, and the first and second holes of each of the two signal transformation matrices 5 left and right images are connected respectively to the first and second inputs of the first and second row switches, respectively, the output of the first .4 V output of the second row switches connecting respectively to the first and second inputs of the first field switch, the output of which is connected to the first input The generator has a subnetwork, its frequency, and the third output of the right image conversion matrix is connected to the second input of the subcarrier frequency generator, as well as containing in series the connection. the amplitude modulator and transmitter, and on the receiving side a receiver containing, the output of which is connected to the input of the filter's bandazoso, the output of which is connected to the input of the first delay line, also containing the second delay line, the first, second and third synchronous detectors, and the inputs of the first and the second synchronous detectors are interconnected, and the outputs of the second and third synchronous detectors are connected respectively to the first and second inputs of the first line row switch, the first output of which is connected to the first input matrix green color difference signal and lane VYL1 input of switching fields, and the second output of the first switch rows soybeans; ) .Ine11 with the second input of the matrix of the green color-difference signal and with the second oohdo l block of the field combination, while J output of the matrix of the green color difference signal is connected to the third input of the field switching unit, characterized in that, in order to eliminate cross-distortion:.;.; JKjiy stereo pair signals, the second and third field switches, the third and fourth row switches are entered on the transmitting side and a low-pass filter, the third output of the left image conversion matrix is connected to the input of the second field switch, the first output of which is connected to the input of the third row switch, the first output of which is connected to the first input of the amplitude modulator, and the second output of the second field switch is connected to the second output of the third row switch and the low-pass filter input, the output of which is connected to the second input of the amplitude modulator, in addition, the output of the subcarrier generator is connected to the input of the third field switch, the first output of which is connected to the third input of the amplitude modulator and to the output of the fourth row switch, and the second output of the third field switch is connected to the input of the fourth row switch, and The second, third, fourth, and fifth row switches, the first, second, third, and fourth field switches, the third and fourth delay lines, a low-pass filter, and an adder are inputted to the receiving side, and the receiver output is connected to the input of the first field switch, the first output of which is connected with the input of the second row switch, the first output of which is connected via the second delay line to the first input of the adder, the second input of which is connected to the parallel second outputs of the first field switch and the second switch with rock through a low-pass filter, and the output of the fourth field switch is connected to the control input of the first row switch, while the output of the bandpass filter is connected to the input of the second field switch, the first output of which is connected to the input of the third row switch, and the second output of the second field switch, output the third row switch and the first output of the fourth row switch are interconnected and connected to the inputs of the first and second synchronous detectors, and the output of the first delay line is connected to the input one third its field switch, the first output of which is connected to the input of the third synchronous detector and the output of the fifth row switch, and the second output of the third field switch is connected to the input of the fourth row switch and to the input of the third delay line, and the second output of the fourth row switch is connected to the third input the adder, the output of the third delay line is connected to the first input of the fifth row switch directly, and to the second input through the fourth delay line. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 502524, cl. H 04 N 9/60, 03/26/73. 3 in 6О ABOUT fn B Fig.d Left image1 / e stereo pair /