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Receiver signal processing system for cap signals

  • US 5,930,309 A
  • Filed: 02/27/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 02/27/1997
  • Status: Expired due to Fees
First Claim
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1. A receiver for processing a carrierless AM/PM (CAP) analog signal comprising:

  • first means for causing the CAP signal to rotate about the center frequency of the CAP signal comprising;

    an oscillator responsive to said CAP signal for upconverting said analog CAP signal to a higher frequency which is within a passband frequency;

    filter means responsive to said upconverted analog CAP signal for filtering said higher frequency within the passband;

    translator means responsive to said filter means for centering the frequency of the filtered analog CAP signal to a frequency related to an analog-to-digital (A/D) sample rate of the receiver; and

    a demodulator responsive to said translator means for demodulating said frequency-converted filtered analog CAP signal to bring said CAP signal to baseband, said demodulator including an analog-to-digital converter said demodulated CAP signal rotating about; and

    second means for removing the rotation of the CAP signal about the center frequency.

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