Texas Instruments Corporation

Kazuhiro Kondo

Yu-Hung Kao

Barbara J Wheatley

Ikuo Kudo

Phonetic modeling includes the steps of forming triphone grammars (,) from phonetic data, training triphone models (,), clustering triphones (,) that are acoustically close together and mapping unclustered triphone grammars into a clustered model (,). The clustering process includes using a decision tree based on the acoustic likelihood and allows sub-model clusters in user-definable units.

Method of phonetic modeling using acoustic decision tree

Improved speech recognition is achieved according to the present invention by use of between word and/or between phrase coarticulation. The increase in the number of phonetic models required to model this additional vocabulary is reduced by clustering 19, 20 the inter-word/phrase models and grammar into only a few classes. By using one class for consonant inter-word context and two classes for vowel contexts, the accuracy for Japanese was almost as good as for unclustered models while the number of models was reduced more than half.

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Plano, TX, United States of America

Kazuhiro Kondo