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Demodulation and modulation circuit and demodulation and modulation method

  • US 20050190847A1
  • Filed: 09/16/2003
  • Published: 09/01/2005
  • Est. Priority Date: 02/24/1999
  • Status: Abandoned Application
First Claim
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1. A demodulation circuit for demodulating a digital transmission signal, wherein a preliminarily known signal being inserted in said digital transmission signal upon transmission, said demodulation circuit comprising:

  • A/D converting means for performing A/D conversion of a base band signal obtained by demodulation of said digital transmission signal; and

    phase shifting means for causing phase shift of one of said digital transmission signal and said base band signal on the basis of said known signal after digital conversion by said A/D converting means and said known signal upon transmission.

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