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Oracle estimation of adaptive cosine packet transforms for underdetermined audio source separation

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2 Author(s)
Andrew Nesbit ; Department of Electronic Engineering, Queen Mary, University of London, Mile End Road, E1 4NS, UK ; Mark D. Plumbley

We address the problem of instantaneous, underdetermined audio source separation by time-frequency masking. Using oracle estimators, we determine experimental upper performance bounds, by assuming that we have reference sources available, and that we know, or have estimated, the mixing structure. Oracle estimation of four musical sources from two-channel mixtures demonstrates a potential for SDR improvements of up to 12.7 dB, compared to semi-blind methods. We also show that using adaptive cosine packet transforms, rather than fixed-basis STFTs, can improve performance by up to 2.2 dB. Finally, by allowing more than one non-zero source coefficient per time-frequency index, improvements of up to 7.7 dB could be possible.

Published in:

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

Date of Conference:

March 31 2008-April 4 2008