Noise reduction circuit for a video signal using a feedback type

Details Noise reduction circuit for a video signal using a feedback type Noise reduction circuit for a video signal using a feedback type

1984-12-03

1986-02-18

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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H04N 964

Patent

active

045716137

ABSTRACT:
A noise reduction circuit for a video signal, comprises a feedback type comb filter in which an output video signal of a delay circuit which delays a video signal by one or two horizontal scanning periods, is fed back to an input side of the delay circuit through a feedback path, and an equalizer circuit coupled in series with the feedback type comb filter. The feedback path comprises a highpass or bandpass filter circuit, a limiter, and a coefficient multiplier which are coupled in series. The equalizer circuit has a frequency characteristic approximately complementary to an envelope characteristic in a frequency characteristic of the feedback type comb filter.

REFERENCES:
patent: 3836707 (1974-09-01), Murakami et al.
patent: 4291330 (1981-09-01), Hirai
patent: 4390894 (1983-06-01), Raven
patent: 4513311 (1985-04-01), Hirai et al.

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