Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1992-11-24
1994-09-06
Groody, James J.
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348669, H04N 978
Patent
active
053452763
ABSTRACT:
A composite video signal is separated into a luminance signal and a color signal according to spectrum distributions thereof. A band-pass filter extracts a composite video signal existing in a predetermined frequency band; a band-rejection filter removes a composite video signal existing in a predetermined frequency band; first and second line comb filters each separate a luminance signal and a color signal from an output signal of the band-pass filter; a frame comb filter separates a luminance signal and a color signal from an output signal of the band-pass filter by a correlation between frames; a vertical variation detector detects a picture variation component in a vertical axis from an output signal of the band-pass filter; a temporal variation detector detects a picture variation component in a temporal axis from an output signal of the band-pass filter; a horizontal variation detector detects a picture variation in a horizontal axis from the composite video signal; a first mixer mixes the color signals separated by the first and second line comb filters and the frame comb filter and an output signal of the band-pass filter according to output signals of the horizontal, vertical and temporal variation detectors; and a second mixer mixes luminance signals separated by the first and second line comb filters and the frame comb filter and an output signal of the band-rejection filter, according to output signals of horizontal, vertical and temporal variation detectors.
REFERENCES:
patent: 4707732 (1987-11-01), Matono et al.
patent: 4754322 (1988-06-01), Okuda et al.
patent: 4764964 (1988-08-01), Tanaka et al.
patent: 4982271 (1991-01-01), Sugiyama et al.
patent: 4984068 (1991-01-01), Sugiyama et al.
Burgess Glenton B.
Gold Star Co. Ltd.
Groody James J.
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