Speaker adaptation using discriminative linear regression on time-varying mean parameters in trended HMM
First Claim
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1. A model-space transformation method for speech recognition comprising the steps of:
- applying a linear transformation to a trended HMM; and
estimating mean parameters of said trended HMM with a minimum classification error (MCE) training;
said linear transform applying step adapting a set of speaker independent models to aspecific speaker by applying a set of linear transformations to respective Gaussian mean vectors thereof.
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Abstract
A method and apparatus using a combined MLLR and MCE approach to estimating the time-varying polynomial Gaussian mean functions in the trended HMM has advantageous results. This integrated approach is referred to as the minimum classification error linear regression (MCELR), which has been developed and implemented in speaker adaptation experiments using a large body of utterances from different types of speakers. Experimental results show that the adaptation of linear regression on time-varying mean parameters is always better when fewer than three adaptation tokens are used.
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7 Claims
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1. A model-space transformation method for speech recognition comprising the steps of:
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applying a linear transformation to a trended HMM; and estimating mean parameters of said trended HMM with a minimum classification error (MCE) training; said linear transform applying step adapting a set of speaker independent models to a specific speaker by applying a set of linear transformations to respective Gaussian mean vectors thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of recognizing speech, comprising the steps of:
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applying global linear regression based speaker adaption using MCE-based discriminative training in a trended HMM; optimally estimating time varying polynomial Gaussian mean functions in the trended HMM; and sequentially performing modified viterbi score calculations for each alphabet classification task.
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Specification