SU1760639A1 - Tv sync-waveform generator - Google Patents

Abstract

The invention relates to television and can be used to stabilize television images. The purpose of the invention is to improve the accuracy of forming a complete television synchronization signal. The TV synchro generator includes a clock generator 1, a frequency divider 2, a line frequency counter 3, a field frequency counter 4, a shaper 5 horizontal sync pulses, a shaper 6 frame sync pulses, an adder 7, a register 8, a multiplexer 9 and decoders 10, 11. 1 Il.

Description

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The invention relates to television and can be used to stabilize a television image in display devices.

The purpose of the present invention is to improve the accuracy of forming a complete television synchronization signal.

The drawing shows a structural electrical circuit of a television synchro generator.

The TV sichrohne contains a clock generator 1, a frequency divider 2, a row frequency counter 3, a field frequency counter 4, a shaper 5 horizontal sync pulses, a shaper 6 HR sync pulses, an adder 7, a register 8, a multiplexer 9 and a decoder 10 and an additional decoder 11, and shapers 5 and 6 lowercase and frame sync pulses are made identical in

as decoders 12-415 and triggers 16 and 17,

Television sync works as follows.

The horizontal sampling clock frequency, which determines the horizontal resolution of the TV image, is generated by the clock generator 1 and is fed to the input of frequency divider 2, which is necessary to form a standard TV clock signal. Decoders 12 and 13 of the front of the imaging unit 5, respectively, select the moment of the beginning of the formation of the horizontal damping pulses (SGI) and the horizontal sync pulses (SDI) and at the same time set the triggers 16 and 17, which form the duration of these signals, into a single state. Decoders 14 and 15 of the imaging unit 5 isolate the moments of the end of the pulse duration, respectively, of the SGI and FID, and at the same time set the triggers 16 and 17 to zero

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condition. The decoder 10 extracts pulses of double horizontal frequency, which are fed to the summing (clock) input of the frequency counter for fields 4, which divides this frequency by 625 and thereby forms the necessary pulse following period (field period).

Decoders 12 and 13 of the front-side imager 6 select, respectively, the moments of the beginning of the formation, frame sync pulses (XI) and frame blanking pulses (CGI) and simultaneously set the triggers 16 and 17, which form the duration of these signals, to a single state. The ends of them are separated by the decoders 14 and 15 of the driver 6, setting the triggers 16 and 17 to the zero state.

A similar adder 7 serves to sum the components of a television signal by level and to obtain at its output a complete television synchronization signal.

Depending on what phase the double horizontal frequency pulse will come in, the decoder 10 and 11 will send to the frequency counter 4 input, the lines on the screen of the television indicator will be shifted vertically.

When geometrical image transformations in television imaging devices, it becomes necessary to place image discretization elements between the lines of a standard television raster formed with

using a synchronous generator, in which by connecting the required pulse sequence of a double horizontal frequency generated by the decoders 10 and 11 to the input of the frequency field counter 4 by means of the register 8 and multiplexer 9, the generated raster is shifted vertically to the length of the interlaced frequency.

Claims (1)

Invention Formula Television sync generator containing serially connected clock generator, frequency divider, line frequency counter, lowercase driver sync pulses and an adder, the other inputs of which are connected to the corresponding outputs of the framing sync pulse generator, the input of which is connected to the output of the field frequency counter, and a decoder, the input of which is connected to the output of a line frequency counter, characterized in that, in order to increase the accuracy of generating a complete television synchronization signal, the additional connected decoder and multiplexer are connected in series, as well as the shift register, the output of which is connected to the control input of the multiplexer, and the input of the additional the decoder is connected to the input of the decoder, the output of which is connected to the corresponding input of the multiplexer, the output of which is connected to the input of the field frequency counter, and the register inputs are respectively, the control inputs of the sync generator. 1 h