Apparatus and method for reducing noise in a video signal

Details Apparatus and method for reducing noise in a video signal Apparatus and method for reducing noise in a video signal

1991-06-10

1992-09-08

Chin, T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, H04N 521, H04N 552

Patent

active

051463300

ABSTRACT:
A noise reduction circuit (13) in which a difference signal (S.sub.I -S.sub.I1) between the original video signal (S.sub.I) and a delayed video signal (S.sub.I1) obtained by passing the original video signal (S.sub.I) through a delay circuit (5) is obtained, and a signal obtained by passing the above difference signal (S.sub.I -S.sub.I1) through a gain control amplifier (8) is subtracted from the above original video signal (S.sub.I), and the gain which reflects movement in the gain control amplifier (8) is controlled by a movement detection signal (S.sub.M) of the above original video signal (S.sub.z) and a detection signal (S.sub.c) which reflects the input electric field strength so as not to decrease the gain of the gain control amplifier (8) at middle to weak electric field, the noise reduction circuit may be applied to a television receiver, etc.

REFERENCES:
patent: 4539594 (1985-09-01), Illetschko
patent: 4630117 (1986-12-01), Parker
patent: 4652907 (1987-03-01), Fling
patent: 4737850 (1988-04-01), Lu
patent: 4860104 (1989-08-01), Katsuyama

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