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Efficient empirical determination, computation, and use of acoustic confusability measures

  • US 10,121,469 B2
  • Filed: 03/13/2017
  • Issued: 11/06/2018
  • Est. Priority Date: 10/31/2002
  • Status: Active Grant
First Claim
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1. A method for generating an acoustic confusability measure, said method comprising the steps of:

  • receiving as input a corpus, comprising a set of utterances with corresponding reliable transcriptions;

    recognizing, via an automatic speech recognition system, at least one utterance among the set of utterances to yield a recognized utterance, wherein said recognized utterance includes at least one decoded frame sequence;

    coalescing identical sequential phonemes of said at least one decoded frame sequence to yield at least one decoded phoneme sequence;

    determining, for each corresponding reliable transcription, at least one pronunciation, wherein said at least one pronunciation includes at least one true phoneme sequence;

    generating as output said recognized corpus comprising for each said recognized utterance at least said at least one decoded phoneme sequence and said at least one true phoneme sequence; and

    generating an empirically derived acoustic confusability measure from said recognized corpus, said empirically derived acoustic confusability measure comprising a family of probability models Π

    ={p(d|t)} wherein each of d and t are phonemes drawn from an augmented phoneme alphabet Φ



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