Abstract
Mel frequency cepstral coefficients (MFCC) are the most widely used speech features in automatic speech recognition systems, primarily because the coefficients fit well with the assumptions used in hidden Markov models and because of the superior noise robustness of MFCC over alternative feature sets such as linear prediction-based coefficients. The authors have recently introduced human factor cepstral coefficients (HFCC), a modification of MFCC that uses the known relationship between center frequency and critical bandwidth from human psychoacoustics to decouple filter bandwidth from filter spacing. In this work, the authors introduce a variation of HFCC called HFCC-E in which filter bandwidth is linearly scaled in order to investigate the effects of wider filter bandwidth on noise robustness. Experimental results show an increase in signal-to-noise ratio of 7 dB over traditional MFCC algorithms when filter bandwidth increases in HFCC-E. An important attribute of both HFCC and HFCC-E is that the algorithms only differ from MFCC in the filter bank coefficients: increased noise robustness using wider filters is achieved with no additional computational cost. © 2004 Acoustical Society of America.
Recommended Citation
M. D. Skowronski and J. G. Harris, "Exploiting Independent Filter Bandwidth Of Human Factor Cepstral Coefficients In Automatic Speech Recognition," Journal of the Acoustical Society of America, vol. 116, no. 3, pp. 1774 - 1780, Acoustical Society of America, Sep 2004.
The definitive version is available at https://doi.org/10.1121/1.1777872
Department(s)
Electrical and Computer Engineering
Publication Status
Available Access
International Standard Serial Number (ISSN)
0001-4966
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2025 Acoustical Society of America, All rights reserved.
Publication Date
01 Sep 2004
PubMed ID
15478444
