Adaptive anti-crosscolor notch filter for SECAM encoder

Details Adaptive anti-crosscolor notch filter for SECAM encoder Adaptive anti-crosscolor notch filter for SECAM encoder

1998-10-21

2000-12-12

Kostak, Victor R.

Television

Format

Specified color signal format

348624, H04N 1118

Patent

active

061605883

ABSTRACT:
A luminance notch filter for preventing color crosstalk adaptively attenuates a SECAM luminance signal depending on the strength of the luminance signal using digital filtering techniques. The adaptive luminance notch filter includes a bandpass filter centered at the chrominance band that is operative to receive the input luminance signal and provide a bandpass filtered luminance signal. The bandpass filtered luminance signal is multiplied by a gain factor and the multiplied luminance signal is subtracted from the input luminancee signal to provide a notch filtered luminance signal. A detector coupled to the bandpass filter output detects the signal strength of the bandpass filtered luminance signal and the gain factor is adapted in accordance with the detected signal strength. The bandpass filter comprises an infinite impulse response (IIR) filter that is preferably an all-pole IIR filter of at least 3.sup.rd order.

REFERENCES:
patent: 4638351 (1987-01-01), Clarke
patent: 4638381 (1987-01-01), Clarke
patent: 5047841 (1991-09-01), Robinson
patent: 5063438 (1991-11-01), Faroudja
Gold, B., et al., "Theory and Implementation of the Discrete Hilbert Transform," Proceedings of the Symposium on Computer Processing in Communications, Edited by Fox, J. Chichester, Sussex UK Wiley-Interscience, pp. 235-250 (1970).

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