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TitleA directional loudspeaker array for surround sound in reverberant rooms
Publication TypeConference Paper
Year of Publication2010
AuthorsBetlehem, T., Anderson C., and Poletti M.A.
Conference Name20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society
Date Published2010
KeywordsAcoustic devices, Acoustic field measurement, Acoustic fields, Audible frequency, Calibration, Calibration error, Circular arrays, Large arrays, Loudspeaker array, Loudspeakers, Mirrors, Reverberant room, Reverberation, Sound field reproduction, Surround sound, Wall reflection
AbstractWe present a method to enhance the performance of the sound field reproduction approach to 2-D surround sound applicable for reverberant rooms, under the constraint that only a small number of loudspeakers is permissible. The method is based on the idea of using steerable directional loudspeakers to exploit the room reverberation. In home theater applications, exact sound field reproduction is currently handicapped by the unreasonably large numbers of loudspeakers required for operation over audible frequencies. However by exploiting reverberant wall reflections, mirror-sources may be used as additional loudspeakers to help perform the reproduction. Utilizing mirror-sources, the number of loudspeaker locations required throughout the room may be reduced. A large array of omnidirectional loudspeakers can then be replaced by a small number of compact configurable directional loudspeakers. Simulating in a reverberant room with each directional loudspeaker modeled as an array of monopoles, we show that the performance is comparable to a circular array with a much larger number of elements. We quantify the accuracy of the sound field reproduction and the robustness to calibration error, comparing the proposed scheme with the more standard circular array geometry. Copyright© (2010) by the International Congress on Acoustics.

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