Noise Reducing circuit of a video signal

Details Noise Reducing circuit of a video signal Noise Reducing circuit of a video signal

1988-05-18

1989-08-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358340, 358 36, H04N 964, H04N 5213, H04N 591

Patent

active

048601055

ABSTRACT:
A noise reduction circuit for a video signal recording and/or reproducing apparatus comprises a high pass filter for extracting high frequency signal component form the input luminance signal, a limiter circuit for limiting the high frequency signal component, a multiplier for determining the degree of preemphasis and/or deemphasis by multiplying the limited signal, and summing and subtracting circuits respectively for adding and subtracting the high frequency signal component processed by the limiter circuit and the multiplier to and from the original luminance signal. The limiter circuit has an amplitude characteristic which changes a gradient so as to have a characteristic curve of at least three different gradient slopes interconnected in succession with an increase in amplitude of the signal supplied thereto.

REFERENCES:
patent: 4597021 (1986-06-01), Yamamitsu et al.
patent: 4607285 (1986-08-01), Hirota et al.
patent: 4652922 (1987-03-01), Ozaki
patent: 4698696 (1987-10-01), Matsuo
patent: 4709269 (1987-11-01), Ozaki
patent: 4750037 (1988-06-01), Kido et al.
patent: 4768094 (1988-08-01), Uchinoi
patent: 4779133 (1988-10-01), Sugimori et al.

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