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   -> Volume 4, Issue 11


Preprint: Two preprints from Carl Taswell
 
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"Carl Taswell" (taswell@wavbox.com)
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PostPosted: Fri Dec 06, 2002 9:36 am    
Subject: Preprint: Two preprints from Carl Taswell
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Preprint: Two preprints from Carl Taswell

The following preprints are available for downloading from the web at
http://www.wavbox.com/wbpapers.html; please send any comments to the
author; helpful criticisms and suggestions appreciated.

Taswell, C. "Speech Compression with Cosine and Wavelet Packet
Near-Best Bases", Scientific Computing and Computational Mathematics,
Stanford University, August 1995.

Compression of speech from the TIMIT corpus was investigated for
several transform domain methods coding near-best and best bases from
cosine and wavelet packet transforms. Satisficing (suboptimizing)
search algorithms for selecting near-best bases were compared with
optimizing algorithms for best bases in these adaptive tree-structured
transforms. Experiments were performed on several hundred seconds of
speech spoken by both male and female speakers from all dialect
regions of the TIMIT corpus. Near-best bases provided rate- distortion
performance effectively as good as that of best bases but without the
additional computational penalty. Cosine packet bases outperformed
wavelet packet bases.

Taswell, C. "Algorithms for the Generation of Daubechies Orthogonal
Least Asymmetric Wavelets and the Computation of Their Holder
Regularity", Scientific Computing and Computational Mathematics,
Stanford University, August 1995.

Explicit algorithms are presented for the generation of Daubechies
compact orthogonal least asymmetric wavelet filter coefficients and
the computation of their Holder regularity. The algorithms yield
results for any number $N$ of vanishing moments for the
wavelets. These results extend beyond order $N=10$ those produced by
Daubechies for the values of the filter coefficients and those
produced by Rioul for the values of their Holder regularity. Moreover,
they reveal that the choice of phase for the filters published by
Daubechies for orders $N=4$ to $N=10$ was not made consistently. In
particular, her filter coefficients for orders $N=7$ to $N=9$ should
be reflected to their mirror image sequence.


Carl Taswell, MD, PhD Tel: 415-323-4336
WavBox ToolSmiths Fax: 415-323-5779
Post Office Box 9925 Email: taswell@wavbox.com
Stanford, CA 94309-9925 WWW URL: http://www.wavbox.com/

WavBox Software; ToolSmiths Software and Consulting;
WavBox and ToolSmiths are trademarks of WavBox ToolSmiths.
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