Large-vocabulary continuous speech prefiltering and processing s

Details Large-vocabulary continuous speech prefiltering and processing s Large-vocabulary continuous speech prefiltering and processing s

1990-06-22

1993-04-13

Fleming, Michael R.

G10L 900

Patent

active

052029522

ABSTRACT:
A continuous speech prefiltering system for use in continuous speech recognition computer systems. The speech to be recognized is converted from utterances to frame data sets, which frame data sets are smoothed to generate a smooth frame model over a predetermined number of frames. A resident vocabulary is stored within the computer as clusters of word models which are acoustically similar over a succession of frame periods. A cluster score is generated by the system, which score includes the likelihood of the smooth frames evaluated using a probability model for the cluster against which the smooth frame model is being compared. Cluster sets having cluster scores below a predetermined acoustic threshold are removed from further consideration. The remaining cluster sets are unpacked for determination of a word score for each unpacked word. These word scores are used to identify those words which are above a second predetermined threshold to define a word list which is sent to a recognizer for a more lengthy word match. A controller enables the system to initialize times corresponding to the frame start time for each frame data set, defining a sliding window.

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Bahl et al., IEEE, Sep., 1988, pp. 489-492, "Obtaining Candidate Words by Polling in a Large Vocabulary Speech Recognition System".
Bahl et al., IEEE, Feb., 1989, pp. 345-347, "Matrix Fast Match: A Fast Method for Identifying a Short List of Candidate Words for Decoding".
Bahl et al., IEEE, Feb., 1990, pp. 85-88, "Constructing Groups of Acoustically Confusable Words".

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