Noise reduction circuit for a video signal

Details Noise reduction circuit for a video signal Noise reduction circuit for a video signal

1984-04-04

1986-03-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 5213

Patent

active

045757607

ABSTRACT:
A noise reduction circuit for a video signal, comprises a delay circuit for delaying an input video signal by a predetermined delay time which is m times one horizontal scanning period, where m is an integer including one, a first adding circuit for adding the input video signal and the delayed video signal, a subtracting circuit for performing a subtraction between the input video signal and the delayed video signal, a noise clipping circuit for eliminating a noise component which is multiplexed at a zero level of an output signal of the subtracting circuit, and for producing a signal having a waveform corresponsing to a correlation error which is introduced in an output signal of the first adding circuit due to the addition performed in the first adding circuit, and a second adding circuit for adding the output signals of the first adding circuit and the noise clipping circuit so as to produce a video signal in which the correlation error has been compensated and the noise has been reduced.

REFERENCES:
patent: 4443817 (1984-04-01), Faroudja

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