FIELD: TV equipment. SUBSTANCE: high-quality TV receiver provides synchronous detection of intermediate frequency frame signal. Synchronous pulse noise in intermediate frequency signal results in noise with either positive and negative overshoots in video signal which is sent from synchronous video detector. This noise is then replaced with value of video signal which appeared in previous pulse noise in the following way. Video signal with pulse noise is sent as input signal both to detector of pulse noise and to delay line. Output signal is delayed by delay line for about 240 ns and is forwarded as tracing signal for tracing and storing system. Detected signal of pulse noise is used for excitation in storing mode in tracing and storing system. Pulse from detector of pulse noise is extended by duration of 600-800 ns which is greater than duration of most noise pulses. This results in possibility to replace most of pulse noise with delayed and stored values of delayed video signal. EFFECT: suppression of generation of white pulse noise and next black pulse noise in TV picture, suppression of leaking of pulse noise into color signal channel which input receives video signal after synchronous detection, prevention of impact excitation of color signal channel, so that color blinking on TV picture is eliminated. 16 cl, 10 dwg
Authors
Dates
1998-03-20—Published
1993-12-29—Filed