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Efficient High-frequency Bandwidth Extension of Music and Speech

The use of perceptually based (lossy) audio codecs, like MPEG 1 - layer 3 ('mp3'), has become very popular in the last few years. However, at very high compression rates the perceptual quality of the signal is degraded, which is mainly exhibited as a loss of high frequencies. We propose an efficient algorithm for extending the bandwidth of an audio signal, with the goal to create a more natural sound. This is done by adding an extra octave at the high frequency part of the spectrum. The algorithm uses a non-linearity to generate the extended octave, and can be applied to music as well as speech. This also enables application to fixed or mobile communication systems.

Authors: Larsen, Erik; Aarts, Ronald M.; Danessis, Michael
Affiliations: Philips Research, Eindhoven, The Netherlands ; The University of Salford, Salford, Greater Manchester, United Kingdom(See document for exact affiliation information.)
AES Convention:112 (April 2002) Paper Number:5627 Import into BibTeX
Subject:Signal Processing Forum

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