Method and apparatus for computing likelihood and hypothesizing

Details Method and apparatus for computing likelihood and hypothesizing Method and apparatus for computing likelihood and hypothesizing

1996-06-07

1998-11-24

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704231, 704251, 704255, G10L 506

Patent

active

058421637

ABSTRACT:
In a method for determining likelihood of appearance of keywords in a spoken utterance as part of a keyword spotting system of a speech recognizer, a new scoring technique is provided wherein a confidence score is computed as a probability of observing the keyword in a sequence of words given the observations. The corresponding confidence scores are the probability of the keyword appearing in any word sequence given the observations. In a specific embodiment, the technique involves hypothesizing a keyword whenever it appears in any of the "N-Best" word lists with a confidence score that is computed by summing the likelihoods for all hypotheses that contain the keyword, normalized by dividing by the sum of all hypothesis likelihoods in the "N-best" list.

REFERENCES:
patent: 5675706 (1997-10-01), Lee et al.
patent: 5710864 (1998-01-01), Juang et al.
Weintraub, "Keyword-Spotting using SRI's DECIPHER Large-Vocabulary Speech-Recognition System," Proceedings of the 1993 ICASSP Conference, pp. II.463-II.466 (May 1993).
Rohlicek et al., "Continuous Hidden Markov Modeling for Speaker-Independent Word Spotting," Proceedings of the 1989 ICASSP Conference, pp. 627-630.
Rose et al., "A Hidden Markov Model Based Keyword Recognition System," Proceedings of the 1990 ICASSP Conference, pp. 129-132.
Weintraub, "LVCSR Log-Likelihood Ratio Scoring For Keyword Spotting," Proceedings of the 1995 ICASSP Conference.
Weintraub, "Keyword-Spotting Using SRI's Decipher.TM. Large-Vocabulary Speech Recognition System," Proceedings of 1993 ICASSP Conference.

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