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Telephone signal cancellation circuit, digital broadcasting reception circuit and portable digital broadcasting reception apparatus

  • US 7,664,455 B2
  • Filed: 11/30/2006
  • Issued: 02/16/2010
  • Est. Priority Date: 02/17/2006
  • Status: Expired due to Fees
First Claim
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1. A telephone signal cancellation circuit, comprising:

  • a signal coupler for separating a part of a reception signal;

    a telephone signal selection filter for passing a telephone signal among signals in the part of the reception signal from the signal coupler;

    a phase shifter for performing phase inversion on the telephone signal from the telephone signal selection filter; and

    a combiner for combining the telephone signal from the phase shifter with the reception signal, and canceling the telephone signal included in the reception signal.

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