Analysis and prediction of acoustic speech features from mel-frequency cepstral coefficients in distributed speech recognition architectures

Darch, Jonathan, Milner, Ben and Vaseghi, Saeed (2008) Analysis and prediction of acoustic speech features from mel-frequency cepstral coefficients in distributed speech recognition architectures. Journal of the Acoustical Society of America, 124 (6). pp. 3989-4000. ISSN 1520-8524

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Abstract

The aim of this work is to develop methods that enable acoustic speech features to be predicted from mel-frequency cepstral coefficient (MFCC) vectors as may be encountered in distributed speech recognition architectures. The work begins with a detailed analysis of the multiple correlation between acoustic speech features and MFCC vectors. This confirms the existence of correlation, which is found to be higher when measured within specific phonemes rather than globally across all speech sounds. The correlation analysis leads to the development of a statistical method of predicting acoustic speech features from MFCC vectors that utilizes a network of hidden Markov models (HMMs) to localize prediction to specific phonemes. Within each HMM, the joint density of acoustic features and MFCC vectors is modeled and used to make a maximum a posteriori prediction. Experimental results are presented across a range of conditions, such as with speaker-dependent, gender-dependent, and gender-independent constraints, and these show that acoustic speech features can be predicted from MFCC vectors with good accuracy. A comparison is also made against an alternative scheme that substitutes the higher-order MFCCs with acoustic features for transmission. This delivers accurate acoustic features but at the expense of a significant reduction in speech recognition accuracy.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Computing Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Interactive Graphics and Audio Faculty of Science > Research Groups > Smart Emerging Technologies
Depositing User:	Vishal Gautam
Date Deposited:	10 Mar 2011 09:00
Last Modified:	21 Apr 2023 17:31
URI:	https://ueaeprints.uea.ac.uk/id/eprint/23744
DOI:	10.1121/1.2997436

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