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Method and apparatus for improving S/N ratio in digital-to-analog conversion of pulse density modulated (PDM) signal

  • US 20020018013A1
  • Filed: 06/13/2001
  • Published: 02/14/2002
  • Est. Priority Date: 06/14/2000
  • Status: Active Grant
First Claim
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1. A method of improving an S/N ratio in digital-to-analog conversion of a pulse density modulated (PDM) digital signal represented by a waveform having a first predetermined full scale value, said PDM digital signal including a signal component having a second predetermined full scale value, said digital-to-analog conversion producing an analog output signal having a third predetermined fall scale value, said method comprising the steps of:

  • and extracting said signal component from said PDM digital signal to generate an extracted digital signal having said second fall scale value;

    matching said second full scale value of said extracted signal with said third full scale value of said analog output signal; and

    performing a digital-to-analog conversion of said extracted signal having said matched second full scale value to produce said analog output signal having said third predetermined full scale value.

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