Holographic Whisper: Rendering audible sound spots in three-dimensional space by focusing ...
summary
A prototype ultrasonic phased array generates one or more focal points in air that act as audible sound points by modulating ultrasound and produces discreet, localized sound heard at a listener’s ears rather than along a beam. Measured advantages include higher audience selectivity (sound confined to a person-sized spot) and lower ultrasonic exposure compared with beam-type devices. The implementation uses phased-array beamforming, demonstrates practical focal spots in 3D, and is evaluated with prototypes and application sketches.
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