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Title: A New Phonetic Tied-Mixture Model For Efficient Decoding
Authors: Akinobu Lee
Tatsuya Kawahara
Kazuya Takeda
Kiyohiro Shikano
Issue Date: Jun-2000
Publisher: IEEE
Start page: 1269
End page: 1272
Abstract: A phonetic tied-mixture (PTM) model for efficient large vocabulary continuous speech recognition is presented. It is synthesized from context-independent phone models with 64 mixture components per state by assigning different mixture weights according to the shared states of triphones. Mixtures are then re-estimated for optimization. The model achieves a word error rate of 7.0% with a 20000-word dictation of newspaper corpus, which is comparable to the best figure by the triphone of much higher resolutions. Compared with conventional PTMs that share Gaussians by all states, the proposed model is easily trained and reliably estimated. Furthermore, the model enables the decoder to perform efficient Gaussian pruning. It is found out that computing only two out of 64 components does not cause any loss of accuracy. Several methods for the pruning are proposed and compared, and the best one reduced the computation to about 20%
Description: ICASSP2000: IEEE International Conference on Acoustics, Speech, and Signal Processing, June 5-9, 2000, Istanbul, Turkey.
ISBN: 0780362934
ISSN: 1520-6149
Rights: Copyright 2000 IEEE
Text Version: Publisher
Publisher DOI: 10.1109/ICASSP.2000.861808
Appears in Collections:情報科学研究科 / Graduate School of Information Science

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