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TitleCreation of a single sound field for multiple listeners
Publication TypeConference Paper
Year of Publication2014
AuthorsPoletti, M.A., and Betlehem T.
Conference NameINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control
Date Published2014
KeywordsAcoustic field measurement, Acoustic fields, Acoustic noise, Acoustic variables control, Acoustic waves, acoustics, Binaural reproduction, Cross-talk canceller, Crosstalk, Field coefficient, Loudspeakers, Mode matching method, reproduction, Sound reproduction systems, Surround systems, Tracking system
AbstractSound reproduction systems are limited in their ability to create sound fields over large areas and over wide bandwidths, because the required number of loudspeakers becomes prohibitive. This limits the ability of surround systems to create sound fields large enough to be heard by multiple listeners. This paper considers an alternative approach to the creation of a single sound field for multiple listeners in which reproduction is accurate in a number of small zones of sufficient size for each listener. This results in a significant reduction in loudspeaker requirements compared to the creation of a single zone that encompasses all listeners. The approach is based on conversion of the sound field coefficients of the global field into localized coefficients within each zone and a mode-matching method for simultaneously reproducing the local fields in each zone. The theory is developed for the 2D case, for simplicity, and simulations are presented to demonstrate the effectiveness of the approach. Such a system would require a tracking system to determine the position of each listener, but the tracking requirements would be less stringent than are required for binaural reproduction using a cross talk canceller.

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