Using intercarrier signals for detecting NTSC interference in digital TV receivers
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United States of America Patent
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-
Jul 13, 1999
Grant Date -
N/A
app pub date -
Mar 21, 1997
filing date -
Mar 21, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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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