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An application of discriminative feature extraction to filter-bank-based speech recognition

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4 Author(s)
Biem, A. ; ATR Human INf. Processing Res. Lab., Kyoto Univ., Japan ; Katagiri, S. ; McDermott, E. ; Biing-Hwang Juang

A pattern recognizer is usually a modular system which consists of a feature extractor module and a classifier module. Traditionally, these two modules have been designed separately, which may not result in an optimal recognition accuracy. To alleviate this fundamental problem, the authors have developed a design method, named discriminative feature extraction (DFE), that enables one to design the overall recognizer, i.e., both the feature extractor and the classifier, in a manner consistent with the objective of minimizing recognition errors. This paper investigates the application of this method to designing a speech recognizer that consists of a filter-hank feature extractor and a multi-prototype distance classifier. Carefully investigated experiments demonstrate that DFE achieves the design of a better recognizer and provides an innovative recognition-oriented analysis of the filter-bank, as an alternative to conventional analysis based on psychoacoustic expertise or heuristics

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Speech and Audio Processing, IEEE Transactions on  (Volume:9 ,  Issue: 2 )