NDLI: Techniques for variable rate speech coding using wavelet representations

Content Provider	IEEE Xplore Digital Library
Author	Srinivasan, P. Jamieson, L.H.
Copyright Year	1996
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA (Srinivasan, P.)
Abstract	This paper presents two techniques for variable rate speech coding using wavelet representations. In the first method, the Daubechies wavelet is used to produce a wavelet representation of the speech signal. This representation is encoded using some of the properties of the speech signal to allocate bits to the various subbands. A technique to lower the bit rate using vector quantisation is discussed and perceptual results are reported. The second technique caters to the encoding of speech in the presence of road noise, as in the cellular environment. It has been observed that in the presence of noise, the wavelet extrema representation provides a "denoising effect", and the temporal correlation of the speech signal can be exploited. A modification of Vetterli's projection algorithm using spline interpolation has been found to give perceptually better results for speech encoded in the presence of noise. Examples of signals encoded by this method are shown. Preliminary results indicate that the first technique performs well for clean speech (comparable to GSM), and the second exhibits robustness to noise with quality almost comparable to GSM.
Starting Page	109
Ending Page	112
File Size	409555
Page Count	4
File Format	PDF
ISBN	0780335120
DOI	10.1109/TFSA.1996.546698
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Speech coding Speech enhancement Working environment noise GSM Bit rate Vector quantization Encoding Roads Projection algorithms Spline
Content Type	Text
Resource Type	Article

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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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