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Compensation of Loudspeaker-Room Responses in a
Robust MIMO Control Framework.
Lars-Johan Brännmark,
Adrian Bahne
,
and
Anders Ahlén
IEEE Transactions on Audio, Speech, and Language Processing
, Vol. 21, No. 6, June 2013, pp. 1201-1216.
© 2013 IEEE
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Abstract:
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A new multichannel approach to robust broadband
loudspeaker–room equalization is presented. Traditionally, the
equalization (or room correction) problem has been treated
primarily by single-channel methods, where loudspeaker input
signals are prefiltered individually by separate scalar filters.
Single-channel methods are generally able to improve the average
spectral flatness of the acoustic transfer functions in a listening
region, but they cannot reduce the variability of the transfer functions
within the region. Most modern audio reproduction systems,
however, contain two or more loudspeakers, and in this paper we
aim at improving the equalization performance by using all available
loudspeakers jointly.
To this end we propose a polynomial
based MIMO formulation of the equalization problem. The new
approach, which is a generalization of an earlier single-channel
approach by the authors, is found to reduce the average reproduction
error and the transfer function variability over a region
in space.
Moreover, pre-ringing artifacts are avoided, and the
reproduction error below 1000 Hz is significantly reduced with an
amount that scales with the number of loudspeakers used.
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Related publications:
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PhD Thesis
by Lars-Johan Brännmark
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PhD Thesis
by Adrian Bahne
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Paper in IEEE SP 2013
on symmetric loudspeaker-room equalization
utilizing a pairwise channel similarity criterion.
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Paper in IEEE SP 2009
on spatially robust audio compensation for single channels.
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Audio research at Signals and Systems
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Main
entry in list of publications
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