Spectral peak-weighted liftering of cepstral coefficients for speech recognition

In this paper, we propose a peak-weighted cepstral lifter (PWL) for enhancing the spectral peaks of an ail-pole model spectrum in the cepstral domain. The design parameter of the PWL is the degree of pole enhancement or pole shifting toward the unit circle. The optimal pole shifting factor is chosen by considering the sensitivity to spectral resonance peaks, the variability of cepstral variances, and the recognition accuracy. Next, we generalize the PWL so that the optimal shifting factor is adaptively determined in frame-by-frame basis. Compared with other cepstral lifters, a speech recognizer employing the frame-adaptive PWL provides better recognition performance.
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Issue Date
2000-07
Language
ENG
Citation

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, v.E83D, no.7, pp.1540 - 1549

ISSN
0916-8532
URI
http://hdl.handle.net/10203/73524
Appears in Collection
EE-Journal Papers(저널논문)
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