Noise reduction circuit for video signal having field memory

Details Noise reduction circuit for video signal having field memory Noise reduction circuit for video signal having field memory

1988-03-03

1989-02-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358 36, 358340, H04N 521, H04N 718

Patent

active

048070343

ABSTRACT:
A noise reduction circuit allows a field memory to store 1-field data of a video signal through a subtracting circuit. The video signal is supplied from a VTR through an A/D converter. The noise reduction circuit causes a subtracting circuit to subtract a delayed video signal, which is supplied from the field memory with a 1-field time delay, from the video signal and allows the resultant signal to be output as a field difference signal. A noise component included in the video signal is extracted by a noise extracting circuit in accordance with the field difference signal, and is output to the subtracting circuit. In a comparing circuit, the noise component is compared with a predetermined reference value so as to determine whether the video signal represents a motion or motionless picture. In accordance with this determination result, memory control circuit controls whether to write the video signal supplied from the subtracting circuit in the field memory. In addition, a video signal from which the noise component is removed is supplied from the subtracting circuit and monitored on a CRT display through a D/A converter or the like.

REFERENCES:
patent: 4090221 (1978-05-01), Connor
patent: 4246610 (1981-01-01), Takahaski
patent: 4291333 (1981-09-01), Warnock et al.
patent: 4365490 (1983-01-01), Rieclerer
patent: 4539594 (1985-09-01), Illetschko
patent: 4581642 (1986-04-01), Poetsch et al.
patent: 4661849 (1987-04-01), Hinman

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