Lexical tree pre-filtering in speech recognition

Details Lexical tree pre-filtering in speech recognition Lexical tree pre-filtering in speech recognition

1996-08-22

1998-10-13

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704252, G10L 506

Patent

active

058227300

ABSTRACT:
A speech recognition technique uses lexical tree pre-filtering to obtain lists of words for use in performing speech recognition. The lexical tree pre-filtering includes representing a vocabulary of words using a lexical tree and identifying a first subset of the vocabulary that may correspond to speech spoken beginning at a first time by propagating through the lexical tree information about the speech spoken beginning at the first time. A second subset of the vocabulary that may correspond to speech spoken beginning at a second time is identified by propagating through the lexical tree information about the speech spoken beginning at the second time. Words included in the speech are recognized by comparing speech spoken beginning at the first time with words from the first subset of the vocabulary and speech spoken beginning at the second time with words from the second subset of the vocabulary. The state of the lexical tree is not reset between identifying the first and second subsets.

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patent: 5526463 (1996-06-01), Gillick et al.
Woods et al., "Uses of Higher Level Knowledge in a Speech Understanding System: A Progress Report," ICASSP (1976), pp. 438-441.
Klovstad, "Probabilistic Lexical Retrieval Component with Embedded Phonological Word Boundary Rules," Bolt Beranek and Newman, Inc., Cambridge, MA, p. 578, abstract of paper.
El meliani, R. et al. "A Syllabic Filler Basec Continuos Recognizer for Unlimited Vocabulary." Electrical and Computer Engineering, 1995 Canadian Conference.

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