Method of recognizing a sequence of words and device for carryin

Details Method of recognizing a sequence of words and device for carryin Method of recognizing a sequence of words and device for carryin

1995-03-29

1999-08-31

Tsang, Fan S.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704236, 704240, 704242, 704243, 704256, G10L 502

Patent

active

059466553

ABSTRACT:
When a language model is to be used for the recognition of a speech signal and the vocabulary is composed as a tree, the language model value cannot be taken into account before the word end. Customarily, after each word end the comparison with a tree root is started anew, be it with a score which has been increased by the language model value so that the threshold value for the scores at which hypotheses are terminated must be high and hence many, even unattractive hypotheses remain active for a prolonged period of time. In order to avoid this, in accordance with the invention a correction value is added to the score for at least a part of the nodes of the vocabulary tree; the sum of the correction values on the path to a word then may not be greater than the language model value for the relevant word. As a result, for each test signal the scores of all hypotheses are of a comparable order of magnitude. When a word end is reached, the sum of all added correction values is subtracted and the correct language model value is added.

REFERENCES:
patent: 4759068 (1988-07-01), Bahl et al.
patent: 5388183 (1995-02-01), Lynch
patent: 5465317 (1995-11-01), Epstein
patent: 5502791 (1996-03-01), Nishimura et al.

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