SU1619423A1 - Decoder of ntsc tv receiver - Google Patents

Abstract

The invention relates to television, can be used in televisions, video monitoring devices and monitors. The purpose of the invention is to improve the quality of color reproduction by expanding the range of adjustment of the phase and the amplitude constant of an exemplary flash. The device contains a video detector 1, an adjustable phase shifter (RF) 2, a variable resistor 3 for adjusting the phase of an exemplary flash, a clock generator 4, a switch (K) 5, a switch (P) 6, a decoder 7 for NTSC color signals, a knob 8 for adjusting color tone and button 9. Video detector 1 consists of a complex video signal consisting of luminance and chroma components, an exemplary flash and sync line and frame pulses, simultaneously arriving at K 5, RF 2 and sync generator 4, where the line retrace pulse is formed. P 6 transmits this pulse, which controls K 5, through which video enters decoder 7. By means of RF 2, the phase of the selected exemplary flash is adjusted from 0 to 180e by changing the resistance of resistor 3 by rotating the knob 8. When the sample flash is not present, the video signal from video detector 1 enters decoder 7 without any distortion. The goal is achieved by the introduction of PV 2, K 5 and A.6. 1 il. and s

Description

ABOUT

QS & U & e

The invention relates to television technology and can be used in the construction of tepvisors designed to receive color (images on the NTSC system as well as in video monitoring devices and monitors.

The aim of the invention is to improve the color rendering quality by expanding the range of adjustment of the phase and the amplitude constant of the model flash.

The drawing shows a structural electrical circuit of a dictated NTSC television receiver device.

TV decoder ((the NTSC receiver of the NTSC contains video detector 1, adjustable phase shifter 2, variable exemplary flash phase adjustment resistor 3, clock generator 4, commutator 5, switch 6, NTSC color signal decoder 7, button 9 .

The device works as follows.

A complex video signal consisting of luminance and chrominance components, an exemplary flash and sync line and frame pulses from the output of video detector 1 is fed simultaneously to the first switch input of switch 5, to the input of adjustable Phase 2, and to the input of sync generator 4, where a line pulse is formed return impulse. A reverse impulse is fed to the input of switch 6, which, if a color tone adjustment is required (button 9 is pressed), passes this control signal to the control input utatora 5 In the absence of the horizontal retrace pulse at control input of the switch to the input video decoder 7 is output from the video detector 1 through the switch 5, and if any - with the controlled release phase shifter 2 where the controlled (dedicated aza exemplary flash within

0-180 ° by changing the resistance of the variable resistor 3 by rotating the knob 8 through another input of the switch 5.

Thus, during the time of the forward stroke along the line, when the sample flash is absent, the video signal

from the output of the video detector 1 to the input of the decoder 7 enters without any distortion, and consequently, the color quality is improved.

The shutdown device of the color tone adjustment device is sufficient to block the passage of the horizontal return pulse from the output of the synchronous generator 4 to the control input of the switch 5. This operational function is performed by the disconnecting device 6 using the button 9.

Such a structural implementation of the color tone adjustment, in contrast to the existing ones, has the advantage that it does not depend on the structure of the decoder 7 of the color signals of the NTSC system of a color television receiver.

Formula of invention

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The decoder of the television receiver system NTSC, containing a serially connected video selector, whose input is the information input of a decoding device, the clock generator, and also a decoder, the output of which is 1 output of a decoding device, different from that color rendition by expanding the range of adjustment of the phase and the amplitude constant of the model plug, serially connected adjustable phase shifter is introduced, to the input of which is connected the output gideodetektora, and switch to the second input of which is connected to the output vitseotsetektora ,. and a switch between the output of the synchro-generator and the flashing switch's stroke, 5 whose output is connected to the input of the decoder.

Claims (1)

Claim A decoding device for an NTSC television receiver containing a series-connected / video detector, the input of which is the information input of the decoding device, and a clock generator, as well as a decoder, the output of which is the output of the decoding device, characterized in that it improves color reproduction by expanding range of phase adjustment and constancy of the amplitude of the model flash, introduced sequentially connected regulate-. a phase shifter, to the input of which the output of the video detector is connected, and a switch, to the second input of which the output of the video detector is connected, and a switch connected between the output of the clock generator and the regulating input of the switch, the output of which is connected to the input of the decoder.