Noise reduction circuit for a chrominance signal of a using fram

Details Noise reduction circuit for a chrominance signal of a using fram Noise reduction circuit for a chrominance signal of a using fram

1988-07-21

1990-05-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, H04N 964, H04N 5213

Patent

active

049281658

ABSTRACT:
A circuit for reducing noises of a chrominance signal in a television receiver. The circuit includes a decoder for decoding first and second color difference signals, each including a noise component from a received chrominance signal, a signal subtraction circuit for generating a first frame difference signal in response to two successive first color difference signals and a second frame difference signal in response to two successive second color difference signals, a signal converting circuit for extracting a first compensation signal from the first frame difference signal and a second compensation signal from the second frame difference signal, a noise reduction circuit for reducing noises from the color difference signals in response to the compensation signals, a discrimination circuit for discriminating whether both the first and second frame difference signals are smaller than a prescribed level or not and for generating a control signal in response thereto, and a signal transmission circuit for transferring the compensation signals from the signal converting circuit to the noise reduction circuit in response to the control signal only when both the frame difference signals are smaller than the prescribed level.

REFERENCES:
patent: 4058836 (1977-11-01), Drewery et al.
patent: 4246610 (1981-01-01), Takahashi
patent: 4291333 (1981-09-01), Warnock et al.
patent: 4333104 (1982-06-01), Geller
patent: 4670775 (1987-06-01), Faroudja et al.
patent: 4823184 (1989-04-01), Belmares-Sarabia et al.

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