2-line YC separation device

Details 2-line YC separation device 2-line YC separation device

1997-04-18

1999-09-28

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348664, 348665, H04N 978

Patent

active

059596953

ABSTRACT:
A 2-line YC separation device reduces the number of delay circuits used for horizontal scanning time delay and minimizing arithmetic operation errors of comb-line filters. The device comprises a first delay circuit for delaying an input video signal for a horizontal scanning period; a first band-pass filter circuit whose input is the input video signal, a second band-pass filter circuit whose input is the output signal of the first delay circuit, a Y-correlation detector whose input is the output signals of the first and second band-pass filter circuits, a C-correlation detector whose input is the output signals of the first and second band-pass filter circuits, a second delay circuit for delaying the output signal of the Y-correlation detector for a horizontal scanning period, a third delay circuit for delaying the output signal of the C-correlation detector for a horizontal scanning period; and an operational circuit whose input is the output signals of the Y-correlation detector and C-correlation detector and the output signals of the second and third delay circuits.

REFERENCES:
patent: 5206715 (1993-04-01), Jung
patent: 5264923 (1993-11-01), Bhang
European Search Report for EP 97 30 2663 dated Aug. 22, 1997.

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