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Cited by 496

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The Application of Hidden Markov Models in Speech Recognition

Gales, Mark, Young, Steve·2007·Foundations and Trends® in Signal Processing

Abstract

Hidden Markov Models (HMMs) provide a simple and effective framework for modelling time-varying spectral vector sequences. As a consequence, almost all present day large vocabulary continuous speech recognition (LVCSR) systems are based on HMMs. Whereas the basic principles underlying HMM-based LVCSR are rather straightforward, the approximations and simplifying assumptions involved in a direct implementation of these principles would result in a system which has poor accuracy and unacceptable sensitivity to changes in operating environment. Thus, the practical application of HMMs in modern systems involves considerable sophistication. The aim of this review is first to present the core architecture of a HMM-based LVCSR system and then describe the various refinements which are needed to achieve state-of-the-art performance. These refinements include feature projection, improved covariance modelling, discriminative parameter estimation, adaptation and normalisation, noise compensation and multi-pass system combination. The review concludes with a case study of LVCSR for Broadcast News and Conversation transcription in order to illustrate the techniques described.

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Metadata

Authors
Gales, M., & Young, S.
Venue
Foundations and Trends® in Signal Processing
Publisher
Emerald
Published
2007
Volume
1
Issue
3
Pages
195-304
ISSN
  • 1932-8346 (ISSN-L)
  • 1932-8354
OpenAlex
W4205130185
Cited by
496
References
4
FWCI
21.73
Type
journal article
Language
en
Open access
closed

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