Parametric emitter system with noise cancelation

摘要

An ultrasonic noise cancelation system can include a communication module configured to receive a noise signal detected by a noise detection module, the noise signal representing a noise sound in a listener environment; a noise cancelation module configured to invert the received noise signal thereby creating an inverse noise signal representing an inverse of the noise sound; and a modulator configured to modulate the inverse noise signal onto an ultrasonic carrier to generate an ultrasonic signal.

主权项

1. An ultrasonic audio system for canceling a noise sound from a listening environment, comprising:
an audio processing system, comprising:
a communication module configured to receive a noise signal detected by a noise detection module, the noise signal representing the noise sound in a listener environment;a noise cancelation module configured to invert the received noise signal thereby creating an inverse noise signal representing an inverse of the noise sound;an equalization module configured to equalize the received noise signal either before or after it is inverted by the noise cancelation module; anda modulator configured to modulate the equalized and inverse noise signal onto an ultrasonic carrier to generate an ultrasonic signal; and an ultrasonic emitter coupled to receive the ultrasonic signal and to launch an ultrasonic pressure wave representing the ultrasonic signal into a transmission medium in the listening environment toward an intended listener, wherein upon transmission in the transmission medium, the ultrasonic signal demodulates, thereby producing an inverse of the noise sound in the listening environment.