Noise reduction feedback type comb filter

Details Noise reduction feedback type comb filter Noise reduction feedback type comb filter

1985-12-18

1987-10-27

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358107, H04N 5213

Patent

active

047033436

ABSTRACT:
A comb filter which shows a comb filter characteristic when a vertical correlation of an input signal is large and allows the input signal to pass as is when the vertical correlation is small includes a delay circuit for delaying the input signal by a predetermined time to obtain a delayed signal, a vertical correlation detecting circuit for detecting the vertical correlation of the input signal from the input signal and the delayed signal and for outputting a vertical correlation signal corresponding to the vertical correlation when the vertical correlation is large but not outputting any signal when the vertical correlation is small, and an operational circuit for operating upon the input signal and an output signal of the vertical correlation detecting circuit to obtain an output signal of the comb filter. Another operational circuit for operating upon the input signal and a predetermined feedback signal obtained from the vertical correlation detecting circuit and for supplying the result to the delay circuit may be provided before the delay circuit to construct a feedback type comb filter. Furthermore, the input signal may be passed through another delay circuit before being supplied to the operational circuit for outputting the output signal so that an undesired time delay produced within the filter can be compensated for.

REFERENCES:
patent: 3836707 (1974-09-01), Murakami et al.
patent: 4291330 (1981-09-01), Hirai
patent: 4302768 (1981-11-01), Kamura et al.
patent: 4575760 (1986-03-01), Nakagaki et al.
"Sony--New Systems for Video Processing ICs", N. Yamashita, J. Hirai, K. Yamagiwa, and S. Saiki, Jun. 8, 1983, pp. 1-15.

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