Adaptive notch filter for removing residual subcarrier from comp

Details Adaptive notch filter for removing residual subcarrier from comp Adaptive notch filter for removing residual subcarrier from comp

1996-05-14

1998-09-08

Burgess, Glenton B.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348625, 348631, 348666, 348627, 348713, H04N 978

Patent

active

058052380

ABSTRACT:
The 25 Hz offset present in the subcarrier frequency of the PAL television standard causes residual and phase modified subcarrier to be left on the luminance signal, which can produce undesirable visual artifacts in the picture. In order to filter luminance therefore without loss of resolution, an adaptive luminance filtering process and structure are provided. Due to the wide range of sample frequencies that must be dealt with, there are e.g. three separate filters available selectable under software control depending on the particular video standard being filtered, i.e. for various of the of NTSC and PAL television standards. The adaptive notch filter is switched on during times of low video transitions and is by-passed during high video transitions, thus avoiding loss of resolution during the high video transitions.

REFERENCES:
patent: 5016092 (1991-05-01), Perlman
patent: 5424784 (1995-06-01), Raby
patent: 5550936 (1996-08-01), Someya et al.

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