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Method and apparatus for processing a physiological signal

  • US 20020099281A1
  • Filed: 01/14/2002
  • Published: 07/25/2002
  • Est. Priority Date: 09/30/1999
  • Status: Active Grant
First Claim
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1. A method for determining a fundamental period from an input signal, the method comprising the following steps:

  • selecting a predetermined maximum period and dividing the period into a plurality of incremental periods; and

    determining a transform at each of the plurality of incremental periods by;

    summing the values resultant from multiplying the input signal by a plurality of points spaced equidistantly on a first periodic waveform having a period substantially equivalent to the incremental period; and

    summing the values resultant from multiplying the input data by a plurality of points spaced equidistantly on a second periodic waveform having a period substantially equivalent to the incremental period, wherein the second periodic waveform is substantially orthogonal to the first periodic waveform.

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