NDLI: Complex Wavelet Modulation Subbands for Speech Compression

Content Provider	IEEE Xplore Digital Library
Author	Luneau, J.-M. Lebrun, J. Jensen, S.H.
Copyright Year	2009
Abstract	Low-frequency modulation of sound carry essential information for speech and music. They must be preserved for compression. The complex modulation spectrum is commonly obtained by spectral analysis of the sole temporal envelopes of the subbands out of a time/frequency analysis. Amplitudes and tones of speech or music tend to vary slowly over time thus the temporal envelopes are mostly of polynomial type. Processing in this domain usually creates undesirable distortions because only the magnitudes are taken into account and the phase data is often neglected. We remedy this problem with the use of a complex wavelet transform as a more appropriate envelope and phase processing tool. Complex wavelets carry both magnitude and phase explicitly with great sparsity and preserve well polynomials. Moreover an analytic Hilbert-like transform is possible with complex wavelets implemented as an orthogonal filter bank. By working in this alternative transform domain coined as ``Modulation Subbands", this transform shows very promising compression capabilities thanks to interesting sparsity properties and suggests new approaches for joint spectro-temporal analytic processing of slow frequency and phase varying audio signals.
Starting Page	457
Ending Page	457
File Size	116894
Page Count	1
File Format	PDF
ISBN	9781424437535
ISSN	10680314
DOI	10.1109/DCC.2009.52
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Speech Polynomials Wavelet transforms Music Audio compression Spectral analysis Frequency Discrete cosine transforms Discrete transforms Phase distortion subbands modulation spectrum complex wavelets speech compression scales
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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