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A Novel Audio Post-Processing Toolkit for the Enhancement of Audio Signals Coded at Low Bit Rates

Low bit rate audio coding often results in the loss of a number of key audio attributes such as audio bandwidth and stereo separation. Additionally, there is also typically a loss in the level of details and intelligibility and/or warmth in the signal. Due to the proliferation, e.g. on Internet, of low bit rate audio coded using a variety of coding schemes and bit rates over which the listener has no control, it is becoming increasingly attractive to incorporate processing tools in the player which can ensure a consistent listener experience. We describe a novel post-processing toolkit which incorporates tools for (i) Stereo Enhancement, (ii) Blind Bandwidth Extension, (iii) Automatic Noise Removal and Audio Enhancement, and, (iv) Blind 2-to-5 channel upmixing. Algorithmic details, listening results, and audio demonstrations are presented.

Authors: Annadana, Raghuram; E.V., Harinarayanan; Sinha, Deepen; Ferreira, Anibal
Affiliations: ATC Labs; University of Porto/ATC Labs(See document for exact affiliation information.)
AES Convention:123 (October 2007) Paper Number:7221 Import into BibTeX
Subject:Audio Coding

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