Noise reducing circuit for video signal

Details Noise reducing circuit for video signal Noise reducing circuit for video signal

1988-02-12

1988-12-20

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, H04N 5213

Patent

active

047928557

ABSTRACT:
In a noise reducing circuit for a video signal comprising a first subtractor (2), a delay line (3), a second subtractor (4), a non-linear circuit (7) having a full-wave rectification circuit (7b) and a gain control circuit (7a), the gain control circuit (7a) controls a gain such that an output signal level derived from the non-linear circuit (7) increases in accordance with the increase in an output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is within a determined extent, and that the output signal level derived from the non-linear circuit (7) decreases in accordance with the increase in the output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is out of the determined extent.

REFERENCES:
patent: 4194219 (1980-03-01), Drewery
patent: 4249209 (1981-02-01), Storey
patent: 4261014 (1981-04-01), Lee
patent: 4263616 (1981-04-01), Lee
patent: 4331971 (1982-05-01), Bretl
patent: 4415920 (1983-11-01), Kato et al.

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