| 摘要 |
<p>A system and method for reproducing audio sound (100, 500). Audio sound, based on an audio signal, is emitted within a space comprising an audio beamwidth (210, 612). Modulated ultrasonic sound energy based on a modulated ultrasonic sound signal is emitted in an ultrasonic sound direction within an ultrasonic beamwidth that is less than and within the audio beamwidth (220, 222, 614). The modulated ultrasonic sound signal is generated such that the emitted modulated ultrasonic sound energy creates an audible cancellation sound with an amplitude substantially equal to an amplitude of the audio sound at a point within the ultrasonic beamwidth so as to combine with and cancel the audio sound at the point by being substantially out of phase with the audio sound along the ultrasonic sound direction.</p> |
