Luminance/chrominance separating filter

Details Luminance/chrominance separating filter Luminance/chrominance separating filter

1994-04-25

1996-05-14

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348664, 348666, H04N 978

Patent

active

055172555

ABSTRACT:
In a YC separating filter, a first horizontal chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in a horizontal direction to produce a first chrominance signal, a vertical chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in a vertical direction to produce a second chrominance signal, a horizontal and vertical chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in horizontal and vertical directions to produce a third chrominance signal, a first selector selects one of the first, second and third chrominance signals, a second horizontal chrominance extraction filter having a narrower bandwidth than the first horizontal chrominance extraction filter is provided to receive the selected chrominance signal, and a second selector selects the output of the second horizontal chrominance extraction filter when the first selector selects either the first or third chrominance signal, and selects the output of the first selector when the first selector selects the second chrominance signal.

REFERENCES:
patent: 4305091 (1981-12-01), Cooper
patent: 4573070 (1986-02-01), Cooper
patent: 4803547 (1989-02-01), Stratton
patent: 4954885 (1990-09-01), Ito et al.
patent: 5386244 (1995-01-01), Gai
patent: 5392075 (1995-02-01), Gai
John P. Rossi, "Digital TV Comb Filter With Adaptive Features", IERE Conf. Proc., pp. 267-282 (1976).
John P. Rossi, "Digital Television Image Enhancement", J. SMPTE, vol. 84, Jul. (1975).

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