System and method of microphone placement for noise attenuation

摘要

A method and system for attenuating noise comprises identifying a location in an area at which sound emitted from one or more speakers has acoustic characteristics that are substantially similar in measure to corresponding acoustic characteristics of the emitted sound at a location approximated to be near an ear of an occupant of the area. A microphone, which may be a virtual microphone, is disposed at the identified location. The microphone detects sound at the identified location. In response to the sound detected by the microphone, the one or more speakers emit a noise-canceling audio signal adapted to attenuate one or more frequencies in the sound detected by the microphone.

主权项

1. A method of attenuating noise comprising:
identifying a location in an area at which sound emitted from one or more speakers has acoustic characteristics that are matched in measure to corresponding acoustic characteristics of the emitted sound at a location near an ear of an occupant of the area, the identifying comprising:
computing a first transfer function for the sound emitted from the one or more speakers at the location near the ear of an occupant of the area;computing a second transfer function for the sound emitted from the one or more speakers at a second location in the area spatially separated from the location near the ear;comparing the first transfer function to the second transfer function; andidentifying the second location as a candidate for the identified location at which to place a microphone if the second transfer function is matched in measure to the first transfer function; placing the microphone at the identified location; and generating, in response to sound detected by the microphone, a noise-canceling audio signal adapted to attenuate one or more frequencies in the sound detected by the microphone.