Circuit for separating composite color television signal into lu

Details Circuit for separating composite color television signal into lu Circuit for separating composite color television signal into lu

1989-02-24

1990-04-24

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

049204084

ABSTRACT:
A composite color television signal is delayed one horizontal line period by a first 1H-delay circuit and then applied to a first intermediate value circuit via a first bandpass filter for passing frequency components in the vicinity of the color subcarrier frequency and a first inverter on one hand and via a second bandpass filter for passing frequency components in the vicinity of the color subcarrier frequency on the other hand. The first intermediate value circuit derives components of the two input signals which have the same waveform at the same time. The output signal of the first intermediate value circuit is directly applied to a second intermediate value circuit acting like the first intermediate value circuit on one hand and via a second 1H-delay circuit and a second inverter on the other hand. A sum signal of the output signal of the first intermediate value circuit and the output of the second inverter and an inverted signal of the output signal of the second intermediate value circuit are added together to obtain a chrominance signal. The chrominance signal and the output signal of the first 1H-delay circuit are added together to obtain a luminance signal.

REFERENCES:
patent: 4661842 (1987-04-01), Ishige et al.
patent: 4786963 (1988-11-01), McNeely et al.
patent: 4851898 (1989-07-01), Asahara

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