Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1995-02-08
1996-06-04
Metjahic, Safet
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348665, 348666, H04N 978
Patent
active
055237975
ABSTRACT:
A circuit that separates a luminance signal and a color signal so that dot interference in a color transition area of a reproduced image is minimized. A color video signal is transmitted to an adaptive bandpass filter via a vertical carrier color signal extraction filter. An output signal from the adaptive bandpass filter represents the color signal portion of the color video signal. The color signal is subtracted from the color video signal via a subtractor circuit to produce the luminance signal portion of the color video signal. Since the output signal of the bandpass filter is subtracted from the color video signal, the luminance signal portion of the color video signal is separated without being affected by different colors before and after a color transition point.
REFERENCES:
patent: 4041531 (1977-08-01), Bingham
patent: 4489346 (1984-12-01), Tanaka et al.
patent: 4661842 (1987-04-01), Ishige et al.
patent: 4677461 (1987-06-01), Mizutani et al.
patent: 4843457 (1989-06-01), Yamagata
patent: 5144399 (1992-09-01), Nakayama et al.
Aiura Masami
Saionji Osamu
Dover Rennie W.
Hsia Sherrie
Metjahic Safet
Motorola Inc.
Wolin Harry A.
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