Device for reducing noise in a composite video signal

Details Device for reducing noise in a composite video signal Device for reducing noise in a composite video signal

1992-12-16

1995-03-21

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348620, H04N 521, H04N 5213

Patent

active

054000823

ABSTRACT:
A device for reducing noise includes a first delay circuit for producing a first delay signal which is spacewise continuous to a current signal, a second delay circuit for producing a second delay signal which is timewise continuous to the current signal, first and second signal coincidence judging circuits for comparing the current signal with the first and second delay signals at a smapling period and judging whether or not difference in level between the current signal and the first and second delay signals is below a predetermined value continuously for a predetermined number of samples, and a conditional averaging circuit for providing, when it has been judged by the first or second signal coincidence judging circuit that the condition that difference in level between the current signal and the first or second delay signals is below the predetermined value continuously for the predetermined number of samples has been satisfied, an output signal which is an average value of one or both of the delay signals satisfying said condition and the current signal and providing, when there is no delay signal satisfying said condition, the current signal as an output signal thereof. Video S/N and color S/N of signals reproduced from video disc player etc. can be improved in the stage of a composite video signal.

REFERENCES:
patent: 4791487 (1988-12-01), Kozuki et al.
patent: 5051818 (1991-09-01), Mishima

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