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TitleSound reproduction systems using variable-directivity loudspeakers
Publication TypeJournal Article
Year of Publication2011
AuthorsPoletti, M.A., Fazi F.M., and Nelson P.A.
JournalJournal of the Acoustical Society of America
Pagination1429 - 1438
Date Published2011
ISSN00014966 (ISSN)
KeywordsAcoustic fields, acoustics, Active compensation systems, amplifier, Amplifiers, Electronic, article, comparative study, computer simulation, devices, Directivity, Equipment Design, instrumentation, Integral equations, Kirchhoff-Helmholtz integrals, Loudspeakers, Low frequency, mathematical computing, Models, Theoretical, motion, Multichannel system, Numerical Analysis, Computer-Assisted, pressure, Reverberation, Signal processing, Signal Processing, Computer-Assisted, sound, sound detection, Sound fields, Sound reproduction, Sound reproduction systems, Sound Spectrography, theoretical model, time, Time Factors, transducer, Transducers, vibration
AbstractSound reproduction systems using omnidirectional loudspeakers produce reflections from room surfaces which interfere with the desired sound field within the array. While active compensation systems can reduce the reverberant level, they require calibration in each room and are processor-intensive. Directional loudspeakers allow the direct to reverberant level to be improved within the array, but still produce a finite exterior field which reflects from the room surfaces. The use of variable-directivity loudspeakers allows the exterior field to be eliminated at low frequencies by implementing the Kirchhoff-Helmholtz integral equation. This paper investigates the performance of variable-directivity arrays in reducing reverberant levels and compares the results with those derived in a previous paper for fixed-directivity arrays. The results presented may have some impact on the design of commercial multi-channel systems for sound reproduction. © 2011 Acoustical Society of America.

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