Patent Number: 6,434,239

Title: Anti-sound beam method and apparatus

Abstract: A device generates a directional anti-sound beam by modulating an ultrasonic carrier with a sound canceling signal and exciting an ultrasonic transducer with the modulated signal. When the anti-sound beam is directed at a sound source, the level of sound from the sound source is reduced. A microphone monitors the resultant sound for adjusting the sound canceling signal. An alternate signal may be further modulated upon the anti-sound beam to provide a substitute sound at the sound source.

Inventors: DeLuca; Michael Joseph (Austin, TX)

Assignee:

International Classification: G10K 11/178 (20060101); G10K 11/00 (20060101); A61F 011/06 (); G10K 011/16 (); H03B 029/00 ()

Expiration Date: 08/13/2019