Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters
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United States of America Patent
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Jun 28, 1994
Issued Date -
N/A
app pub date -
Jan 13, 1993
filing date -
May 14, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An NTSC interference canceler for eliminating NTSC signal interference from a HDTV signal uses recursive notch filters with adjustable center frequencies to isolate an NTSC signal's major components, i.e. the picture carrier signal, the chrominance subcarrier signal and the audio carrier signal. A single filter is used to isolate each NTSC interference signal component, with each particular filter's center frequency being adjusted to match the frequency of the particular NTSC interference signal component to be isolated by the filter. Each filter's gain may be either fixed or dynamically adjusted to match the amplitude of the NTSC interference signal component. Once isolated, these interference signal components are subtracted from the received television signal which includes both the NTSC interference signal and the HDTV signal. In this manner, the NTSC interference is removed from the HDTV signal.
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