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System activity change indicator

  • US 4,794,533 A
  • Filed: 11/07/1986
  • Issued: 12/27/1988
  • Est. Priority Date: 11/07/1986
  • Status: Expired due to Term
First Claim
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1. A method for determining activity changes occurring in a system as these activity changes are represented in at least one signal representing system activity, said method comprising:

  • acquiring a first sequence of consecutive samples of amplitude values of said system activity signal taken at a rate sufficient to represent those portions of said system activity signal related to said activity changes, said samples in said first sequence being acquired over a selected duration of time established with respect to a selected point in time;

    determining which relative magnitude relationship occurs from among first, second and third relative magnitude relationships between each sample in said first sequence and its immediately neighboring samples on either side thereof excepting those samples occurring first and last in said first sequence;

    forming a second sequence of decision numbers with each such decision number therein having a one-to-one correspondence with a said sample in said first sequence excepting those samples occurring first and last in said first sequence, each said decision number having one of a first selected set of values if its said corresponding sample in said first sequence has relative magnitude relationships with each of its immediately neighboring samples on either side thereof which are identical, but having one of a second selected set of values if its corresponding sample in said first sequence has relative magnitude relationships with each of its immediately neighboring samples on either side thereof which differ; and

    providing an indication of said activity changes based on said decision numbers.

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