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The Use of Airborne Ultrasonics for Generating Audible Sound Beams

A device known as a parametric array employs the nonlinearity of the air to create audible by-products from inaudible ultrasound, resulting in an extremely directive, beamlike wide-band acoustical source. This source can be projected about an area much like a spotlight, and creates an actual spatialized sound distant from the transducer. A basic theoretical analysis of the airborn parametric array is outlined and verified experimentally, and future challenges are discussed.

JAES Volume 47 Issue 9 pp. 726-731; September 1999
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AES - Audio Engineering Society