Comb filter arrangement

Details Comb filter arrangement Comb filter arrangement

1997-02-10

1999-08-03

Peng, John K.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348610, 348665, 348667, H04N 977, H04N 521, H04N 5213, H04N 5217, H04N 978

Patent

active

059331984

ABSTRACT:
For activating or deactivating the comb filter function with pixel precision, a comb filter arrangement including a delay circuit (3) and a first matching circuit (1) having at least two storage cells, these circuits receive a picture signal, having a sequence of individual pixels applied to the comb filter arrangement. The output signals of the delay circuit and the first matching circuit are superposed by a superposition stage (4) supplying a filtered picture signal from its output. The matching circuit (1) is implemented in such a way that it gives the picture signal applied thereto substantially the same amplitude variations as the delay circuit (3), and that the difference between the delay of the output signals from the delay circuit (3) and the matching circuit (1) corresponds to a nominal value. The comb filter arrangement further includes a second matching circuit (2) and a switching circuit (6), the unfiltered picture signal being applied to the input of the second matching circuit (2) which gives the picture signal substantially the same amplitude variations and delays as the first matching circuit (1), and the switching circuit, for switching the comb filter function on and off, alternately deactivating either the second matching circuit (2) or the delay circuit (3).

REFERENCES:
patent: 4179705 (1979-12-01), Faroudja
patent: 4731660 (1988-03-01), Faroudja et al.
patent: 4847681 (1989-07-01), Faroudja et al.
patent: 5012143 (1991-04-01), Boudewijns
patent: 5260775 (1993-11-01), Faroundja
patent: 5420643 (1995-05-01), Romesberg et al.
patent: 5661679 (1997-08-01), Struck

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