×

Speech recognition

  • US 4,956,865 A
  • Filed: 05/02/1988
  • Issued: 09/11/1990
  • Est. Priority Date: 01/30/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of recognizing an unknown speech utterance comprising the steps of:

  • (i) representing said unknown speech utterance as a first sequence of parameter frames, each parameter frame representing a corresponding time frame of said utterance;

    (ii) providing a plurality of reference templates, each comprising a second sequence of parameter frames expressed in the same kind of parameters as the first sequence of parameter frames;

    each parameter frame of the first sequence and second sequence of parameter frames comprising a set of primary parameters and a set of secondary parameters, each of the secondary parameters representing the signed difference between corresponding primary parameters in respective parameter frames derived for different time frames;

    (iii) computing a dynamic loudness component Δ

    Ci,o from said unknown speech utterance as a secondary parameter, and providing a corresponding dynamic loudness component Δ

    T.sub..,o in each of said secondary parameter frames, said dynamic loudness components being a signed rate of change in overall amplitude between frames;

    (iv) comparing each of the primary and secondary parameters in the sequence of parameter frames of the unknown utterance with each reference template and determining which of the reference templates most closely resembles the unknown utterance.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×