Luminance and chrominance signal separating apparatus

Details Luminance and chrominance signal separating apparatus Luminance and chrominance signal separating apparatus

1995-02-24

1998-05-05

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348665, 348667, H04N 978

Patent

active

057482608

ABSTRACT:
A luminance and chrominance signal separating apparatus includes an A/D converter for A/D converting an input composite color television signal by a frequency of eight times of a color subcarrier frequency; a decimation filter for converting the A/D converted digital video signal into a signal with a frequency of four times of the color subcarrier frequency; a chrominance signal separating circuit for extracting a chrominance signal from the signal which was thinned-out by the frequency of four times of the color subcarrier frequency; an interpolating filter for converting the separated chrominance signal into a signal with a frequency of eight times the color subcarrier frequency and outputting a chrominance signal; a delay device for delaying the A/D converted digital video signal by a delay time which occurs when the A/D converted digital video signal passes through the decimation filter, the chrominance signal separator and the interpolating filter; and a subtracting circuit for subtracting the chrominance signal at the output of the interpolating filter from the digital video signal at the output of the delay device and outputting a luminance signal.

REFERENCES:
patent: 4227204 (1980-10-01), Rossi
patent: 4470069 (1984-09-01), Lewis, Jr.
patent: 4500912 (1985-02-01), Bolger
patent: 4549117 (1985-10-01), Takahashi
patent: 5305096 (1994-04-01), Yamagami
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