Noise reduction circuit for a video signal

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

1982-06-16

1986-01-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 521, H04N 9535

Patent

active

045637040

ABSTRACT:
A noise reduction circuit comprises a lowpass filter supplied with a luminance signal having a noise component of an input video signal, for eliminating a high-frequency component including the noise component, a first circuit for subtracting an output signal of the lowpass filter from the luminance signal, in a state where a rise in the level of the luminance signal is delayed by a predetermined time .tau. from the start of a rise in the output of the lowpass filter, where the output signal of the lowpass filter has a rise time .tau., and a second circuit for amplitude-limiting a subtracted output of the first circuit and subtracting the amplitude-limited output from the luminance signal, to obtain a luminance signal eliminated of the noise.

REFERENCES:
patent: 3226646 (1965-12-01), Ludwig
patent: 3602737 (1971-08-01), Radecke
patent: 3893168 (1975-07-01), Beckly
patent: 4009334 (1977-02-01), Sypula
patent: 4302768 (1981-11-01), Kamura
patent: 4393396 (1983-07-01), Raven
Archiv der elektrischen Ubertragung AEU, vol. 18, No. 9, pp. 537-543.

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