C-type comb filter with negative feedback

Details C-type comb filter with negative feedback C-type comb filter with negative feedback

1988-01-27

1989-02-21

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358329, H04N 979

Patent

active

048070491

ABSTRACT:
A C-type comb filter that employs a first charge-coupled device (CCD) delay circuit and a second CCD delay circuit having an intermediate tap, whereby a delayed signal from the intermediate tap is fed back to be subtracted from the input side of the C-type comb filter to thereby form a feedback C-type comb filter, thus improving the comb filter characteristic.

REFERENCES:
patent: 4513311 (1985-04-01), Hirai et al.
patent: 4597021 (1986-06-01), Yamamitsu et al.
patent: 4734758 (1988-03-01), Honjo
patent: 4766487 (1988-08-01), Tanaka et al.

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