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Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding
Joint Authors
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-07-14
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Information Technology and Computer Science
Abstract EN
A bandwidth extension (BWE) algorithm from wideband to superwideband (SWB) is proposed for a scalable speech/audio codec that uses modified discrete cosine transform (MDCT) coefficients as spectral parameters.
The superwideband is first split into several subbands that are represented as gain parameters and normalized MDCT coefficients in the proposed BWE algorithm.
We then estimate normalized MDCT coefficients of the wideband to be fetched for the superwideband and quantize the fetch indices.
After that, we quantize gain parameters by using relative ratios between adjacent subbands.
The proposed BWE algorithm is embedded into a standard superwideband codec, the SWB extension of G.729.1 Annex E, and its bitrate and quality are compared with those of the BWE algorithm already employed in the standard superwideband codec.
It is shown from the comparison that the proposed BWE algorithm relatively reduces the bitrate by around 19% with better quality, compared to the BWE algorithm in the SWB extension of G.729.1 Annex E.
American Psychological Association (APA)
Lee, Young Han& Choi, Seung Ho. 2013. Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding. Advances in Multimedia،Vol. 2013, no. 2013, pp.1-6.
https://search.emarefa.net/detail/BIM-507280
Modern Language Association (MLA)
Lee, Young Han& Choi, Seung Ho. Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding. Advances in Multimedia No. 2013 (2013), pp.1-6.
https://search.emarefa.net/detail/BIM-507280
American Medical Association (AMA)
Lee, Young Han& Choi, Seung Ho. Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding. Advances in Multimedia. 2013. Vol. 2013, no. 2013, pp.1-6.
https://search.emarefa.net/detail/BIM-507280
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-507280