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Improved Loudspeaker-Room Equalization using Multiple
Loudspeakers and MIMO Feedforward Control.
Lars-Johan Brännmark,
Adrian Bahne
,
and
Anders Ahlén
IEEE International Conference on Acoustics,
Speech and Signal Processing, ICASSP 2012,
Kyoto, Japan, 25-30 March 2012, pp. 237-240.
DOI:
10.1109/ICASSP.2012.6287861
© 2012 IEEE
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Abstract:
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In this paper, a new multichannel approach to robust
loudspeaker-room equalization is presented. Traditionally,
the equalization (or room correction) problem has been
treated mostly by single-channel methods, with loudspeaker
signals being prefiltered individually by separate scalar
filters.
Single-channel methods can generally improve the average
spectral flatness of the acoustic transfer functions in a
listening region, but the variability of the transfer
functions within the region cannot be affected.
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 general MIMO formulation of the
problem, which is a multichannel generalization of an
earlier single-channel approach by the authors.
The new approach is found to reduce the average reproduction
error and the spatial variability of the acoustic transfer
functions.
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 Adrian Bahne
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Later, more extensive,
Paper in IEEE TASLP 2013
on compensation of loudspeaker-room responses in a
robust MIMO control framework.
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Paper in IEEE SP 2013
on symmetric loudspeaker-room equalization
utilizing a pairwise channel similarity criterion.
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