Noise reducer circuit for video signal

Details Noise reducer circuit for video signal Noise reducer circuit for video signal

1990-03-15

1991-06-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358340, 358336, H04N 521

Patent

active

050218840

ABSTRACT:
In a video signal noise reducer circuit, an output video signal is delayed in a frame memory, then substracted from an input video signal, and the resultant difference signal then passed through a high pass filter. The difference signal and the filter output signal are then compared, and the one of these signals currently having the smaller absolute amplitude is modified by an amplitude-dependent feedback factor and then subtracted from the input video signal to obtain the output video signal.

REFERENCES:
patent: 4549037 (1985-10-01), Bayer
patent: 4698696 (1987-10-01), Matsuo
patent: 4750037 (1988-06-01), Kido
patent: 4796088 (1989-01-01), Nishimura
patent: 4864404 (1989-09-01), Matsuo
patent: 4961113 (1990-10-01), Okada
patent: 4962434 (1990-10-01), Matsuo

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