Techniques for minimizing co-channel interference in a received ATV signal
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United States of America Patent
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-
Nov 12, 1996
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A technique for enhancing the robustness of an ATV transmission system in the presence of NTSC or ATV co-channel interference comprises positioning the ATV signal relative to the co-channel NTSC/ATV signal to reduce interference into the ATV receiver. In a preferred embodiment, the ATV signal is positioned relative to a co-channel NTSC signal such that the demodulated difference f.sub.v -f.sub.p in the ATV receiver is equal to 70.5 f.sub.seg, where f.sub.v is the NTSC visual carrier frequency, f.sub.p is the ATV pilot carrier frequency and f.sub.seg is the ATV segment repetition rate, and relative to a co-channel ATV signal such that their respective pilot frequencies differ by an amount equal to 1.5 f.sub.seg.
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