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Speech recognition in selective call systems

  • US 5,719,996 A
  • Filed: 06/30/1995
  • Issued: 02/17/1998
  • Est. Priority Date: 06/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method for performing speech recognition by using an acoustic space having a plurality of probability density functions (pdfs), comprising the steps of:

  • dividing the acoustic space into a plurality of regions;

    determining at least one region of the plurality of regions to which a probability density function belongs by determining when the probability density function has a minimum distance to the at least one of the plurality of regions wherein the probability density functions of each region comprise a subset of the plurality of probability density functions;

    generating a hierarchical tree structure representing the subset of the probability density functions associated with the plurality of regions;

    receiving a speech sample;

    determining the region of the plurality of regions by traversing the hierarchical tree structure in which the speech sample has the minimum distance to a center of the region; and

    calculating the subset of probability density functions of the region for recognizing the speech sample received.

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