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Directional Loudspeakers Using Sound Beams

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The relative merits of two directional loudspeakers intended for localized sound-field production, each driven by a single, compact transducer, are considered. They are intended for applications in which audio is required by listeners congregated in a small region of an otherwise reverbverant or noisy environment, such as multimedia venues involving kiosks, museum displays, theme parks, and game centers. The loudspeakers are end-fire line arrays consisting of 1) a ducted point source employing a single compression driver, in which the point sources are at the open ends of tubes of unequal length connected to a common manifold and 2) a parametric acoustic source produced by an intense beam of ultrasound. The directionality, frequency response, and audio output of the arrays are compared by measurement and simulation.

JAES Volume 48 Issue 10 pp. 908-916; October 2000
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