Speech recognition
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United States of America Patent
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Sep 11, 1990
Issued Date -
N/A
app pub date -
May 2, 1988
filing date -
Jan 30, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a speech recognizer, for recognizing unknown utterances in isolated-word speech or continuous speech, improved recognition accuracy is obtained by augmenting the usual spectral representation of the unknown utterance with a dynamic component. A corresponding dynamic component is provided in the templates with which the spectral representation of the utterance is compared. In preferred embodiments, the representation is mel-based cepstral and the dynamic components comprise vector differences between pairs of primary cepstra. Preferably the time interval between each pair is about 50 milliseconds. It is also preferable to compute a dynamic perceptual loudness component along with the dynamic parameters.
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