Method for creating and using multiple-word sound models in spee

Details Method for creating and using multiple-word sound models in spee Method for creating and using multiple-word sound models in spee

1986-10-15

1989-06-06

Shoop, Jr., William M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 41, 381 42, 3645135, G10L 500

Patent

active

048378313

ABSTRACT:
A first speech recognition method receives an acoustic description of an utterance to be recognized and scores a portion of that description against each of a plurality of cluster models representing similar sounds from different words. The resulting score for each cluster is used to calculate a word score for each word represented by that cluster. Preferably these word scores are used to prefilter vocabulary words, and the description of the utterance includes a succession of acoustic decriptions which are compared by linear time alignment against a succession of acoustic models. A second speech recognition method is also provided which matches an acoustic model with each of a succession of acoustic descriptions of an utterance to be recognized. Each of these models has a probability score for each vocabulary word. The probability scores for each word associated with the matching acoustic models are combined to form a total score for that word. The preferred speech recognition method calculates to separate word scores for each currently active vocabulary word from a common succession of sounds. Preferably the first scores is calculated by a time alignment method, while the second score is calculated by a time independent method. Preferably this calculation of two separate word scores is used in one of multiple word-selecting phase of a recognition process, such as in the prefiltering phase.

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"Organization of the Hearsay II Speech Understanding System", Lesser, Fennell, Erman, and Reddy, IEEE Trans. Acoust., Speech, Sig. Process., vol. ASSP-23, p. 11-24, Feb. 1975.
"Motivation and Overview of SPEECHLIS: An Experimental Prototype for Speech Research", Woods, IEEE Trans. Acoust., Speech, and Signal Process., vol. ASSP-23, pp. 2-10, Feb. 1975.
"The HWIM Speech Understanding System", Wolf and Woods, 1977 IEEE Internat. Conf., Record on Acoust., Speech, and Sig. Process., pp. 784-787, May 9-11, 1977.
"A Modified K-means Clustering Algorithm for Use in Isolated Word Recognition", Wilpon and Rabiner, IEEE Trans. on Acoust., Speech, and Sig. Process., vol. ASSP-33, Jun. 1985.

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