SU1716620A2 - Device for formation of video signal of image - Google Patents

Abstract

The invention relates to a television technique and can be used in video image processing devices of an image, followed by recording on a recording medium. The purpose of the invention is to improve noise immunity. The device for forming the video signal of the image contains an input 1 of the device, a selector 2 horizontal sync pulses, a delay unit 3, a comparators block 4, a recording pulse shaper 5, a switch 6, a first pulse sequence selector 7, a last pulse selector 8, a signal generator 9, a pulse shaper 10. 1 hp f-ly, 4 ill.

Description

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The invention relates to a television technique, can be used in devices for processing video signal of an image with subsequent registration on a recording medium, and is an improvement of the device according to the author. St. No. 1497763.

The purpose of the invention is to improve noise immunity.

FIG. 1 is an electrical block diagram of an apparatus for generating an image video signal; in fig. 2 - last pulse selector; in fig. 3 - comparators block; in fig. 4 - time diagrams that show their work.

A device for forming a video signal of an image (Fig. 1) contains an input 1 of a device for forming a video signal of an image, a selector 2 of lowercase

sync pulses, block 3 delays, block 4 comparators, shaper 5 write pulses, switch 6, selector 7 of the first pulse of a sequence of pulses, selector 8 of the last pulse, character generator 9, shaper of 10 pulses, converter 11 of pulse duration.

The selector 8 of the last pulse (Fig. 2) contains inputs 13, control input 14, block 15 of the elements 15.1-15.3, output register 16 consisting of flip-flops 17.1-17.3, block 18 of the elements OR 18.1-18.3, driver 19 pulses.

Comparators block 4 (Fig. 3) contains input 20, comparators 21.1-21.3 with inputs 22.1-22.3 of the reference levels, pulse formers 23.1-23.3, subtraction blocks 24.1-24.3, outputs 25.1-25.3 of the comparators block 1, elements OR 26.1-26.3,

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additional outputs 27.1-27.3 of the comparator block.

A device for generating a video signal of an image operates as follows.

The input video signal (Fig. 4, a) is fed to input 1 and from it to the inputs of block 4 of the comparators and selector 2 of the horizontal sync pulses, which gives a short pulse at the end of the horizontal sync pulse. According to this pulse, the delay unit 3 generates at its separate outputs a signal for generating isofot sequence number in the telemetry transmission time interval and an inverted signal at the rest of the time to register the information part of the string.

Comparators 21.1-21.3 have trigger reference levels that correspond to the isophoto formation scale. The formers 23.1–23.3 generate impulses at their outputs from the differences in the input voltages; using blocks 24.1–24.3, two input parallel pulse sequences are formed into a single polarity. The elements OR 26.1-26.3 convert two input pulse sequences into one (Fig. 4.6, c, d).

The recording pulse shaper 5 converts the input pulse sequence to a form suitable for recording on a recording medium. The output signal of the imaging unit 5 supplies the inputs of the switch 6 and the selector 7 of the first pulse of the pulse sequence, which, if there is a potential at the output of the delay unit 3, delivers the first pulse generated by the unit 5 in the information part of each row (Fig. 4.6). ). During this pulse, the last intersection of the reference level by the video signal is determined by the selector 8 of the last pulse (Fig. 4, e, u, g).

Impulse shaper 7, formed on the falling edge of its input

signal, in the character generator 9, the state code of the selector 8 is written, i.e. The number of the first isophote is determined. The code of the character generator 9 with the help of a control signal from the output of the delay unit 3 and the signal from the output of the imaging unit 5 is fed to the output of the switch 6 at the beginning of the subsequent line, after which the isofoth number code for the subsequent line is determined and stored by the character generator 9.

Claims (2)

1. A device for forming a video signal of an image according to avt. N ° 1497763, characterized in that, in order to improve noise immunity, a last pulse selector is additionally inserted between the additional outputs of the comparators block and the inputs of the character generator, as well as a pulse shaper connected between the output of the first pulse generator selector pulse and the control input of the character generator In this way, the control input of the last pulse selector is connected to the output of the first pulse selector of the pulse train. 2. The device according to claim 1, characterized in that the last pulse selector contains an output register whose findings are the outputs of the last pulse selector, the block of elements AND, the first inputs of which are the inputs of the selector of the last pulse, the block of elements OR, whose outputs connected to the first inputs of the output register, and a pulse shaper, whose input is connected to the second input of the block of AND elements and is the control input of the selector of the last pulse, and the output is connected to the first input of the block of OR elements, second second, third and fourth inputs which are respectively connected to said second, third and fourth inputs of the output register and the first, second and third outputs of block elements I. I r-3 A27 | 27,127