Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1994-01-26
1997-06-17
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348665, 348667, H04N 978
Patent
active
056402112
ABSTRACT:
A luminance signal/color signal separator circuit having an input terminal and luminance and color output terminals includes a comb filter connected between the input terminal and the color output terminal; an amplitude detector having an input connected to the color output terminal; a filter having a first input connected to the input terminal and a second input connected to an output of the amplitude detector; and a combiner having an output connected to the luminance output terminal, a first input connected to the input terminal and a second input connected to an output of the filter. The separator circuit processes a composite signal which includes an original luminance signal and an original color signal. The filter passes a gain controlled color band signal. A signal at the luminance output terminal includes a signal component characterized by an amplitude in a color band frequency range, and the combiner outputs the signal having a signal component amplitude as (1) a first amplitude when the original color amplitude is small, and (2) a second amplitude when the original color amplitude is large, the first amplitude being greater than the second amplitude.
REFERENCES:
patent: 5155582 (1992-10-01), Tokoi
Kawano Mitsumo
Kusano Takahiro
Hsia Sherrie
Kabushiki Kaisha Toshiba
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