Method and apparatus for reducing co-channel interference in an HDTV receiver
First Claim
Patent Images
1. A method of reducing NTSC co-channel interference in an HDTV receiver comprising:
- receiving both the NTSC and the HDTV signal;
developing an interference signal representing substantially only high energy components of the NTSC signal; and
combining said interference signal with the received signals to reduce the effects of the high energy components of said NTSC signal in said HDTV signal.
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Abstract
NTSC co-channel interference is reduced in an HDTV receiver by developing an interference signal that is representative of the high energy components in the NTSC signal and subtracting the interference signal from the received HDTV signal to produce an enhanced HDTV signal for processing.
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Citations
12 Claims
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1. A method of reducing NTSC co-channel interference in an HDTV receiver comprising:
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receiving both the NTSC and the HDTV signal; developing an interference signal representing substantially only high energy components of the NTSC signal; and combining said interference signal with the received signals to reduce the effects of the high energy components of said NTSC signal in said HDTV signal. - View Dependent Claims (2, 3)
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4. A method of reducing NTSC co-channel interference in an HDTV receiver comprising:
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receiving both the NTSC and the HDTV signal; developing a local signal corresponding to the carrier frequency of said NTSC signal; developing an interference signal representing the low frequency, high energy components of said NTSC signal as determined by said local signal; and combining said interference signal with the received signals to reduce the effects of the high energy components of said NTSC signal in said HDTV signal.
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5. An HDTV receiver subject to simultaneous receipt of an HDTV signal and a co-channel NTSC signal comprising:
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means for developing a received signal including both said HDTV signal and said NTSC signal; means for developing an interference signal from said received signal representing the high energy components of said NTSC signal; and means for subtracting said interference signal from said received signal. - View Dependent Claims (6, 7, 8)
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9. For use in a noncompatible HDTV/NTSC television system, an HDTV receiver subject to simultaneous receipt of an HDTV signal and an interfering co-channel NTSC signal comprising:
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means for developing a received signal including both said HDTV signal and said interfering co-channel NTSC signal; and means for reducing the magnitude of said interfering co-channel NTSC signal without significantly affecting said received HDTV signal. - View Dependent Claims (10)
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11. An HDTV receiver subject to simultaneous receipt of an HDTV signal and a co-channel NTSC signal comprising:
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means for developing a received signal including both said HDTV signal and said NTSC signal; means for deriving a local signal corresponding to the carrier of said NTSC signal; means for developing an interference signal responsive to the amplitude of said local signal representing the low frequency, high energy components of said NTSC signal; and means for subtracting said interference signal from said received signal. - View Dependent Claims (12)
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Specification