Wavelet Packets in Speech and Audio
The discrete wavelet transform has become a useful and popular tool for
analyzing non-stationary signals. In some applications, however,
the transform's fixed partitioning in time and frequency can limit its
usefulness. The more general wavelet-packet transform can provide
better tradeoffs in flexibility, simplicity, and performance by allowing
the user to adapt the transform to signals of interest. Current work
is focused on leveraging these properties to provide improved coding and
enhancement of speech and audio signals.
Speech Intelligibility in Digital Hearing Aids
Ambient noise often reduces speech intelligibility by masking perceptually
important cues. These masking effects are particularly troublesome
for hearing-impaired listeners, who often have great difficulty understanding
speech in noise. Current work is focused on extending and evaluating
Models of speech intelligibility in noise, and in using these Models to
prescribe effective single-channel noise reduction algorithms for digital
hearing aids.
Relevant Publications:
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Trenas MA, Rutledge JC, Whitmal NA. "Wavelet-Based Noise Reduction
and Compression for Hearing Aids," Proceedings of the IEEE 21st International
Conference of the IEEE Engineering in Medicine and Biology Society,
October, 1999.
-
Whitmal NA, Rutledge JC. "Noise Reduction in Hearing Aids: A Case
for Wavelet-Based Methods," Mini-symposium on "New Advances in Time-Frequency
and Wavelet Methods," Proceedings of the IEEE 20th International
Conference of the IEEE Engineering in Medicine and Biology Society,
October, 1998. Invited paper.
-
Whitmal NA, Rutledge JC, Wilber LA. "An Evaluation of Wavelet-Based
Noise Reduction for Digital Hearing Aids," Proceedings of the IEEE 19th
International Conference of the IEEE Engineering in Medicine and Biology
Society, October, 1997.
-
Whitmal NA, Rutledge JC, Cohen J. "Reducing Correlated Noise in Digital
Hearing Aids," IEEE Engineering in Medicine and Biology Magazine,
15(5):
88–96, 1996. Invited paper.
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Whitmal NA, Rutledge JC, Cohen J. "Reduction of Autoregressive Noise
with Shift-Invariant Wavelet-Packets," Proceedings of the IEEE Third
International Symposium on Time-Frequency and Time-Scale Analysis,
136–140, 1996.
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