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Noisy speech recognition by using variance adapted hidden Markov models

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3 Author(s)
Jen-Tzung Chien ; Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Lee-Min Lee ; Hsiao-Chuan Wang

Shrinkage of variances in HMM due to additive noise is an important factor in speech recognition process. This variance shrinkage can be nonparametrically estimated from a training database. In the Letter we take this factor into account in the projection measure for noisy speech recognition. Experiments show that recognition rates can be improved significantly

Published in:

Electronics Letters  (Volume:31 ,  Issue: 18 )