Y/C separation circuit and Y/C separation method

Details Y/C separation circuit and Y/C separation method Y/C separation circuit and Y/C separation method

2005-10-18

2009-02-10

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

C348S664000, C348S665000

Reexamination Certificate

active

07489364

ABSTRACT:
A Y/C separation circuit according to the present invention includes: a pattern determination section in which video signals “a”, “b”, and “c” of three lines from which a frequency band of a chrominance subcarrier is extracted through BPFs to determine whether an addition/subtraction result of (b−a), (b+a), (b−c), (b+c), (c−a), and (c+a) is positive or negative, thereby determining relations in amplitude and phase between the video signals “a”, “b”, and “c”; and a filtering section in which one of plural filtering operations for separating a chrominance signal is selected in accordance with the determination result sent from the pattern determination section to output a chrominance signal through the selected filtering operation.

REFERENCES:
patent: 6999130 (2006-02-01), Tanigawa
patent: 7110045 (2006-09-01), Ishihara
patent: 60-47793 (1985-10-01), None
patent: 10-224816 (1998-08-01), None
patent: 2000-175219 (2000-06-01), None

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