A microphone-array configuration for AMNOR

Adaptive microphone-array system for noise reduction

Abstract

This paper describes a microphone-array configuration for AMNOR (Adaptive Microphone-array system for NOise Reduction). AMNOR performance (S/N improvement) depends on the microphone-array configuration. Therefore, the chosen configuration is examined under three different sound field conditions by simulation experiment. The distance between two microphones is first described in detail to show that the optimum microphone distance is one-half the wavelength of the highest frequency in the broadbandnoise of interest. Based on these results, linear and circular-array configurations are next examined. These configurations can obtain similar results by the introduction of apparent microphone distance. The maximum value of this distance should also be one-half the wavelength of the highest frequency of the broadband noise.