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TitleA constrained optimization approach for multi-zone surround sound
Publication TypeConference Paper
Year of Publication2011
AuthorsBetlehem, T., and Teal P.D.
Conference NameICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Date Published2011
KeywordsAcoustic devices, Acoustic field measurement, Acoustic fields, Constrained optimization, Convex optimization, Convex optimization problems, Driving signal, Exact controls, Interior point algorithm, Least-squares approach, Loudspeakers, Signal processing, Sound energy, Speech communication, Surround sound
AbstractA recent approach to surround sound is to perform exact control of the sound field over a region of space. Here, the driving signals for an array of loudspeakers are chosen to create a desired sound field over an extended area. An interesting subtopic is multi-zone surround sound, where two or more listeners can experience totally independent sound fields. However, multi-zone surround sound is a challenge because implementation can be very non-robust. We formulate multi-zone sound reproduction as a convex optimization problem, where the sound energy leakage into other listener zones is limited to fixed levels, and a constraint is placed on the loudspeaker weights to improve the robustness. An interior point algorithm is devised for computing the loudspeaker weights, and its performance is compared with least squares approaches of multi-zone reproduction in typical two-zone cases. © 2011 IEEE.

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