Voltage controlled comb filter

Details Voltage controlled comb filter Voltage controlled comb filter

1988-06-23

1990-06-05

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358329, H04N 979, H04N 978

Patent

active

049318578

ABSTRACT:
A voltage controlled comb filter comprises a 1 H delay circuit, an inverting circuit, and a mixing circuit. A playback carrier chrominance signal is delayed by the delay circuit for 1 H period and is inverted by the inverting circuit. The playback and delayed playback carrier chrominance signals are inputted to the mixing circuit which mixes these signals in proportion variable in accordance with the degree of a line correlation error signal. Therefore, there is no switching noise inherent in the conventional comb filter having a switch circuit used in a video tape recorder.

REFERENCES:
patent: 4143397 (1979-03-01), Holmes
patent: 4178606 (1979-12-01), Hirota
patent: 4263612 (1981-04-01), Gibson et al.
patent: 4524380 (1985-06-01), Shibata et al.
patent: 4731674 (1988-03-01), Fukuda et al.
patent: 4766486 (1988-08-01), Ozaki

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