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An early prototype of an ultrasonic speaker array. -
A custom multi-array and amplifier system used for Sanctum. -
An experimental configuration multiple sound beams. -
A prototype of a 2-D steering ultrasonic speaker array. -
Software tools for beam manipulation. -
A developmental mockup diagram for Sanctum's sound projection behavior. -
The performance of Juan Pampin's Respiración Artificial in which sound beams project outward from performers, reflecting off walls and through the audience.
Ultrasonic beamforming is a technique used to carry audible sound in highly directional sound beams. This technique has yielded the ability to dynamically steer, focus, spread and reflect sound beams using software or other hardware interfaces. Additional beam behaviors have been developed for performance and site-specific installations, such as spatial granulation and manipulating the internal topology of a sound beam. Paired with sensing systems, the sound beams can follow listeners, wander on their own, reflect off walls and bodies, scatter apart and re-form in response to environmental conditions. The technology continues to evolve through its use in a variety of artistic constexts which utilize its inherently spatial behavior and unique perceptual qualities.