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Frequency Warping by Linear Transformation of Standard MFCC Sankaran Panchapagesan

Summary: Frequency Warping by Linear Transformation of Standard MFCC
Sankaran Panchapagesan
Department of Electrical Engineering
University of California, Los Angeles, U.S.A.
panchap @ icsl.ucla.edu
A novel linear transform (LT) is proposed for frequency warp-
ing (FW) with standard filterbank based MFCC features. Here, we
use the idea of spectral interpolation of [9] to perform a continuous
warping in the log filterbank output domain, and incorporate both
interpolation and warping into a single warped IDCT matrix. The
new transformation matrix is thus mathematically simpler than in
[9], and no modification of standard MFCC feature extraction is
required like the previous approach. In VTLN experiments with
maximum likelihood score (MLS) estimation of the FW parameter,
the new LT outperformed regular VTLN implemented by warping
the Mel filterbank. In speaker adaptation experiments using the
new LT to transform HMM means, the results were significantly
better than MLLR for limited adaptation data and comparable to
those in [8], while using the computationally simpler MLS FW


Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles


Collections: Computer Technologies and Information Sciences