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Experiments on Extraction of Non-Parametric Warping Functions for Speaker Normalization  

Shin, Ok-Keun (한국해양대학교 IT공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.24, no.5, 2005 , pp. 255-261 More about this Journal
Abstract
In this paper. experiments are conducted to extract a set of non-Parametric warping functions to examine the characteristics of the warping among speakers' utterances. For this Purpose. we made use of MFCC and LP spectra of vowels in choosing reference spectrum of each vowel as well as representative spectra of each speaker. These spectra are compared by DTW to give the warping functions of each speaker. The set of warping functions are then defined by clustering the warping functions of all the speakers. Noting that male and female warping functions have shapes similar to Piecewise linear function and Power function respectively, a new hybrid set of warping functions is defined. The effectiveness of the extracted warping functions are evaluated by conducting phone level recognition experiments, and improvements in accuracy rate are observed in both warping functions.
Keywords
Speech recognition; Speaker Normalization; Non-parametric; Hybrid; Warping function;
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