Using intercarrier signals for detecting NTSC interference in di

Details Using intercarrier signals for detecting NTSC interference in di Using intercarrier signals for detecting NTSC interference in di

1997-03-21

1999-07-13

Peng, John K.

Television

Basic receiver with additional function

Multimode

348 21, 348607, 348737, H04N 538

Patent

active

059233788

ABSTRACT:
During a period of transition from broadcasting analog TV signals to broadcasting digital TV signals, digital TV reception is susceptible to disruption owing to co-channel interference by analog TV signals. During this same transition period usually a digital TV receiver will incorporate an auxiliary analog TV receiver. This auxiliary analog TV receiver is advantageously used during digital TV signal reception for determining the amount of co-channel interference by analog TV signals, so that comb filtering can be selectively applied to symbol coding recovered from the digital TV signal, for suppressing artifacts of co-channel interfering analog TV signal when they are large enough to have substantial adverse on symbol decoding. The amount of NTSC co-channel interference is estimated by detecting the level of intercarrier generated by mixing the audio and video signals of the analog TV signal.

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