NDLI: Frequency selectivity via the SpEnt methodology for wideband speech compression

Content Provider	IEEE Xplore Digital Library
Author	Kokes, M.G. Gibson, J.D.
Copyright Year	2001
Description	Author affiliation: Dept. of Electr. Eng., Southern Methodist Univ., Dallas, TX, USA (Kokes, M.G.)
Abstract	In speech and audio coding, frequency selectivity of the basis functions is an important property of the codec. The more precise the frequency selectivity, the less chance there is for audible coding effects due to uncanceled aliasing. We use Campbell's (1960) coefficient rate and the spectral entropy (SpEnt) of the source random process as a guide to formulate adaptive nonuniform modulated lapped biorthogonal transforms (NMLBT). The use of the NMLBT allows for efficient implementation of a time-varying transform which possesses both good frequency and time resolution at all instances, without the need for transitional filters. By coupling the SpEnt methodology with modulated lapped biorthogonal transforms (MLBT), we develop band combining strategies to produce an adaptive NMLBT. Due to the nature of the SpEnt methodology, the new frequency selection process comprises a non-linear approximation method to determine the best n basis functions to represent the current speech frame. We implement a wideband speech compression scheme based on this strategy and verify its improved performance in coding speech and audio signals at 16 and 24 kbps.
Sponsorship	IEEE Signal Process. Soc
Starting Page	777
Ending Page	780
File Size	446106
Page Count	4
File Format	PDF
ISBN	0780370414
ISSN	15206149
DOI	10.1109/ICASSP.2001.941030
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Wideband Speech coding Speech codecs Audio coding Entropy Random processes Filters Approximation methods Speech processing
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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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