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Method and apparatus for performing pattern recognition analysis

  • US 4,742,458 A
  • Filed: 10/29/1985
  • Issued: 05/03/1988
  • Est. Priority Date: 10/29/1985
  • Status: Expired due to Fees
First Claim
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1. A method of performing pattern analysis of a digital signal containing at least one waveform, comprising the steps of:

  • detecting a fiducial point of each waveform of said digital signal, said step of detecting said fiducial point of each waveform including the step of detecting a segment of the respective waveform, which segment has a slope with an absolute value greater than a trigger value, said step of detecting a segment including the steps of forming a delta value for each sampling point of said digital signal by subtracting the value of each sampling point from the value of the sampling point occurring m sampling points previous thereto, determining the average of n highest differences in values between consecutive sampling points in a predetermined interval of said digital signal, obtaining said trigger value based on said average, and detecting a first sampling point having a delta value at least equal to said trigger value as said fiducial point, where m an n are integers;

    capturing at least two characteristic features of each waveform of said digital signal;

    creating a signature for each waveform based on said captured at least two characteristic features of each waveform;

    determining a closest proximity of said signature to one classification of at least one previously determined classification of signatures;

    creating a new classification with said signature if said closest proximity has a value less than a predetermined threshold value; and

    adding said signature to said one classification if said closest proximity has a value at least equal to said predetermined threshold value.

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