Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1991-12-02
1994-08-02
Groody, James J.
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348665, 348713, H04N 964
Patent
active
053350219
ABSTRACT:
A logical comb filter comprises a first delay circuit receiving an input composite video signal called a succeeding signal for delaying the received succeeding signal by one scan line period so as to output a main signal composed of the delayed succeeding signal, and a second delay circuit receiving the main signal for delaying the received main signal by one scan line period so as to output a preceding signal composed of the delayed main signal. An addition circuit is connected at its first input to receive the main signal. A selection and control circuit receives the succeeding signal, the main signal and the preceding signal for supplying the succeeding signal to a second input of the addition circuit when the relation of the main signal>(is greater than) the succeeding signal>the the preceding signal or the relation of the preceding signal>the succeeding signal>the main signal is satisfied. When the relation of the main signal>the preceding signal>the succeeding signal or the relation of the succeeding signal>the the preceding signal>the main signal is satisfied, the selection and control circuit supplies the preceding signal to the second input of the addition circuit. When the relation of the preceding signal>the main signal>the succeeding signal or the relation of the succeeding signal>the main signal>the preceding signal is satisfied, the selection and control circuit supplies the main signal to the second input of the addition circuit.
REFERENCES:
patent: 4851898 (1989-07-01), Asahara
patent: 4961108 (1990-10-01), Perlman
patent: 5051818 (1991-09-01), Mishima
Groody James J.
Hsia Sherrie
NEC Corporation
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