초록 ▼

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 microphon

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.

대표청구항 ▼

1. A method of at least partially canceling sound produced by an audio source comprising the steps of:generating a sound canceling signal in response to the audio source; modulating an ultrasonic carrier signal with the sound canceling signal to produce a modulated carrier signal; exciting a transdu

1. A method of at least partially canceling sound produced by an audio source comprising the steps of:generating a sound canceling signal in response to the audio source; modulating an ultrasonic carrier signal with the sound canceling signal to produce a modulated carrier signal; exciting a transducer with the modulated carrier signal to produce a substantially directional anti-sound beam; and directing the anti-sound beam towards the audio source.