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Method and apparatus for fast on-line automatic speaker/environment adaptation for speech/speaker recognition in the presence of changing environments

  • US 20040230420A1
  • Filed: 12/03/2003
  • Published: 11/18/2004
  • Est. Priority Date: 12/03/2002
  • Status: Active Grant
First Claim
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1. A method for fast on-line automatic speaker/environment adaptation suitable for speech/speaker recognition in the presence of changing environmental conditions, the method comprising acts of:

  • performing front-end processing on an acoustic input signal, wherein the front-end processing generates MEL frequency cepstral features representative of the acoustic input signal;

    performing recognition and adaptation by;

    providing the MEL frequency cepstral features to a speech recognizer, wherein the speech recognizer utilizes the MEL frequency cepstral features and a current list of acoustic training models to determine at least one best hypothesis;

    receiving, from the speech recognizer, at least one best hypothesis, associated acoustic training models, and associated probabilities;

    computing a pre-adaptation acoustic score by recognizing an utterance using the associated acoustic training models;

    choosing acoustic training models from the associated acoustic training models;

    performing adaptation on the chosen associated acoustic training models;

    computing a post-adaptation acoustic score by recognizing the utterance using the adapted acoustic training models;

    comparing the pre-adaptation acoustic score with the post-adaptation acoustic score to check for improvement;

    modifying the current list of acoustic training models to include the adapted acoustic training models, if the acoustic score improved after performing adaptation; and

    performing recognition and adaptation iteratively until the acoustic score ceases to improve;

    choosing the best hypothesis as recognized words once the acoustic score ceases to improve; and

    outputting the recognized words.

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