Method and apparatus for reducing false rejection in a speech re

Details Method and apparatus for reducing false rejection in a speech re Method and apparatus for reducing false rejection in a speech re

1996-11-27

1998-12-01

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704240, G10L 506, G10L 900

Patent

active

058452451

ABSTRACT:
The invention relates to a method and apparatus for grouping orthographies in a speech recognition dictionary to reduce false rejection. In a typical speech recognition system, the process of speech recognition consists of scanning the vocabulary database by using a fast match algorithm to find the top N orthography groups. In a second pass the orthographies in the selected groups are re-scored using more precise likelihoods. The top orthographies in the top two groups are then processed by a rejection algorithm to find if they are sufficiently distinct from one another. In the affirmative the top choice candidate is accepted, otherwise the entire procedure is terminated. The novel method comprises the steps of grouping confusable orthographies together to reduce the possibility of false rejection.

REFERENCES:
Lennig, "Putting Speech Recognition to Work in the Telephone Network", Computer, IEEE, Bell-Northern Research and INRS-Telecommunications, (1990).
Gorin et al., "Adaptive Acquisition of Language", Computer Speech and Language, vol. 5, (1991), pp. 101-132.
Lennig et al., "Flexible Vocabulary Recognition of Speech Over the Telephone", Bell -Northern Research and INRS-Telecommunications, pp. 1-3, (1992).
Lennig et al., "Automated Bilingual Directory Assistance Trial in Bell Canada", Bell-Northern Research, pp. 1-4.
Y. Gao et al., "Dynamic Adaptation of Hidden Markov Model for Robust Speech Recognition", IEEE International Syposium on Circuits and Systems, vol. 2, May (1989), pp. 1336-1339.

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