SU760487A1 - Device for transmitting and receiving stereocolour television images - Google Patents

Description

one

Invention Refers to television technology.

A device for transmitting and receiving stereo-color television images is known, which contains on the transmitting side channels of the left and right stereo pairs, each of which consists of a color television camera and a signal conversion matrix, each of which is connected to the inputs of the first switch. The outputs of which are connected to the inputs of the second switch, to the control input of which a signal is given. frame frequency and the output of which is connected to the first input of the generator subcarrier, the second, the input of which is connected to the output of the luminance signal of the channel of the right image. stereopairs, a delay line, an amplitude modulator of a television signal carrier connected to a transmitter, and on the receiving side - a series connected receiver and a first band-pass filter, a block of synchronous detectors, the first and second outputs of which are connected to the first switch,

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the outputs of which are connected to the inputs. the second switch and with the inputs of the matrix of the green color-difference signal, the output of which is connected to the second switch, to the input of the control of the Psiga-EOg'aDrO'a often-. you, the first delay line VD ·

However, the known device has undesirable crossover indications between the signals of the stereo pair.

The purpose of the invention is to reduce cross-distortion between signals.

• stereo pairs.

15 To do this, the device for transmitting and receiving stereo color television. images, containing on the transmitting side channels of the left and right images of the stereo pair, each of

20 of which consists of a series-connected color television camera and a signal conversion matrix, the outputs of the color-difference signals each of which are connected to the inputs of the first Switch, the outputs of which are connected to the inputs of the second switch, the control input of which is given a frame frequency signal and the output is connected to the first entrance 30 house of the subcarrier generator modulator,

, 760487

the second input of which is connected to the output of the luminance signal of the channel of the right image of the stereo pair, the delay line, the amplitude modulator of the television signal carrier connected to the transmitter, and on the receiving side - connected in series 5 receiver and first bandpass filter, block of synchronous detectors, the first and second output of which connected to the first switch, the outputs of which are connected to the inputs of the second switch Ю paradise with the inputs of the matrix of the green color difference signal, the output of which is connected to the second switch , The input control signal is fed frame frequency, the first line delayed ki-15, on the transmission side output luminance of the left image signal channel is connected to the third entered

the switch, the first output of which is connected through the entered low-pass filter to the first amplitude input. TV carrier signal modulator, the second input of which is connected to the output of the delay line, the input connected to the second output _

the third switch, and the third input of the amplitude modulator of the television signal carrier is connected to the output of the entered fourth switch, the input connected to the output of the generator-modulator subcarrier, while the control inputs of the first switch receive quarter-line signals and the third and fourth switches are signals of the half-line frequency; on the receiving side, the output of the first bandpass filter is connected to the first input of the entered third switch, the second input of which is connected to the output The second second bandpass filter, the input connected to the output of the receiver and the third input of the third switch, the fourth, fifth and sixth inputs of which are connected to the corresponding outputs of the inserted delay unit, the input of which is connected to the first output and the seventh input of the third switch, the second, third and fourth outputs of which are connected to the inputs of a block of synchronous detectors, the fifth output is connected through the input 50 low-pass filter to the first input

the entered adder, the second input of which is connected to the sixth output of the third switch, the seventh output of which is connected via the first delay line 55 to the third input of the adder, with this the quarter-line and semi-line frequency signals are fed to the control inputs of the first and third switches, respectively. here

FIG. 1 shows the structural

electrical circuit device for

^ ё ^ ёа'Э? CHI ^x ^ tёrOvV'ёt ⁴ th television

images; in fig. 2 - structural

wiring diagram of the device for 65

receiving stereo color television images; in fig. 3 - ne spectra (emitted signals; in Fig. 4 - spectra of the left and right images of the ste-reopar after their reception and separation.

A device for transmitting and receiving stereo-color television images contains on the transmitting side color television cameras (CTC) 1,

2, matrix 3, 4 conversion, switches 5,6, 7, generator-modulator 8, switch 9, low pass filter (LPF) 10, delay line (LZ)

11, amplitude modulator (AM) 12, transmitter 13, and switch 5 contains switches 14, 15, ’on the receiving side - receiver 16, bandpass, filters (PF) 17, 18; delay unit 19, switch 20, unit 21 synchronous detectors, low-pass filter (LPF) 22, delay line (LZ) 23, switch 24, matrix 25 of the green color difference signal, adder 26, switch 27. Delay block 19 contains a delay line (LZ ) 28, 29,

30. Switch 20 includes switches 31, 32, 33, 34, 35, first input 36, second input 37, third input 38, fourth input 39, fifth input 40, sixth input 41, first output 42, second output 43, third output 44, the fourth output 45, the fifth output 46, the sixth output 47, the seventh output 48. The block 21 of synchronous detectors contains synchronous detectors (LEDs) 49, 50, 51.

The device works as follows.

For example, for odd lines of both fields, the input of amplitude modulator 12 comes from matrix 3 via switch 7 and delay line 11, the luminance signal of the left stereopair image in a wide frequency band. As a result, in odd lines the television signal carrier is modulated by a signal whose spectrum is shown in FIG. 3

For example, for even-numbered lines of both fields, the input of the amplitude modulator 12 comes from the matrix 3 through the switch 7 and the luminance signal of the left image of the stereo pair, limited in band by means of the LPF 10.

At the same time, to the other input AM 12 from the generator-modulator 8 of the subcarrier frequency, through the switch 9, the pre-carrier frequency is supplied. The latter is modulated simultaneously by two narrow-band signals of the right stereopair image: the luminance one, which comes from matrix 4, and one of the color difference signals K-V in line n-1 and B- \ in line n + 1, fig.Z. Subcarrier located outside spektraΥ _lambda, modulation type - kvadraturnaya- balanced amplitude modulation / eg, as in ΝΤ50 or SLAVE TV color systems. Communicator gator 6 provides alternately

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fields transfer color difference signals of the left .and right image. As a result, in even-numbered lines, the television signal carrier is modulated by a signal whose spectrum is shown in FIG. 3. Compaction without overlapping spectra and causes the absence of cross-distortion.

On the receiving side, the video signal is formed at the output of the receiver 16, 10

Consider the sequence of formation of the left and right images of the stereo pair (Fig. 4). 3 for the odd lines of the first field signal V _A in a broad band 45 extends transferred breakers 35 Switch 20, line delay 23, adder 26 (the other two inputs are at the same time, nothing is supplied) and appears at the output of the receiving side ( Fig. 4a, c). 20

During the even rows of the resulting output signal of the receiver 16 proper (Fig. .3) in the LPF 22 is allocated narrowband \ _L signal and enters HA adder 26. At the same time "with its third input receives the high frequency components from the previous signal ( η - 2) —th lines that are allocated PF 17 (with a bandwidth of about 2.5 ... 6.0 MHz) and pass switch 31 of switch 20, LZ (per line) 28 and switch 33 of switch 20. Bandwidth The low-pass filter 22 'and PF 17 are chosen so that the signal spectrum does not have a dip in the mid-frequency range (FIG. 46, 35

g - the delayed spectral components are shown by a dotted line). In this field, the right image is transmitted in color. · A narrowband luminance signal Υ _{Λ is} formed at the output of the receiver 16 40 (Fig. 4e) as a result of detection in the SD 49 subcarrier highlighted by the FS 18 during the previous (nth) th line delayed line LZ 28 and passing the switch 33 of the switch 20. At the same time, the color difference signal (8-Υ) (p-5) of the right stereo pair image appears at the output of the synchronous detector 58, and at the output of the synchronous detector 51 (8- Υ) · (η-3) st line. Synchronous detection is performed in the same way as in color television systems with quadrature Modulation subcarrier. The bandwidth of the FS 17 is chosen such that only the spectrum of the modulated subcarrier frequency is allocated (i.e. approximately 3.1 ...

... 6 MHz). Color-difference signals (K-γ) and (B- \) pass the switches 24 and 27. In the matrix 25, the formation of the "green" 'color difference signal of the right, a. in the next field of the left image * stereopair. Similarly, the processing of ro-time signals of even fields occurs. But, since - *

during even fields in color, the left image is transmitted, then on the receiving side, at the outputs of switch 27, three color difference signals of the left image appear in the 0 ... 1.5 MHz band (Fig. 4a-d, second field).

Technical and economic efficiency of the device for transmitting and receiving stereo-color television images consists in reducing cross-distortion between stereopair signals.

Claims (1)

Claim A device for transmitting and receiving stereo-color television images containing on the transmitting side channels of the left and right stereo pairs, each of which consists of a color television camera and in series connected. signal conversion matrix, the outputs of the color difference signals of each of which are connected with the inputs of the first switch, the outputs of which are connected to the inputs of the second switch, the control input of which is given a frame frequency signal and the output of which is connected to the first input of the subcarrier generator-modulator, the second input of which is connected to the output of the luminance signal of the channel of the right image of the stereo pair, the delay line, the amplitude modulator of the television signal carrier connected to the transmitter, and on the receiving side hence the first receiver band-pass filter, the synchronous detector unit, the first and second outputs of which are connected to the first switch, the outputs of which are connected to the inputs of the second switch and the inputs of the matrix of the green color difference signal, the output of which is connected to the second switch frame rate, the first delay line, which is averaged by the fact that, in order to 'reduce cross-section distortion between the stereopair signals, the output of the luminance sig The left image channel is connected to the entered third switch, the first output of which is connected via the input low pass filter to the first amplitude modulator of the carrier signal of the television signal, the second input of which is connected to the output of the delay line, the input connected to the second output of the third switch, and the third the input of the amplitude modulator of the television signal carrier is connected to the output of the inputted fourth switch, the input connected to the output of the generator 7 760487 8 the subcarrier modulator, while the control inputs of the first switch are quarter-frequency signals, and the inputs of the third and fourth switches are semi-line frequency signals; on the receiving side, the output of the first band-pass filter is connected to the first input of the entered third switch, the second input of which is connected to the output of the entered second band pass filter, the input connected to the output of the receiver and the third input of the third switch, the fourth, fifth and sixth inputs of which are connected to the corresponding outputs input delay block, vhbd which is connected to the first output and the seventh input of the third switch, the second, third and fourth the outputs of which are connected to the inputs of a block of synchronous detectors, the fifth output is connected through the input low-pass filter to the first input of the input adder, the second input of which _ connected to the sixth output of the third ³ switch, the seventh output of which connected through the first delay line to the third input of the adder, while the control inputs of the first and third switches are given a quarter-line and semi-line frequency, respectively. ⁴ , '