Adaptive noise cancellation with directional microphones

Author

Elko, Gary W.

Author_Institution

Dept. of Acoust. Res., AT&T Bell Labs., Murray Hill, NJ, USA

fYear

1997

fDate

19-22, Oct 1997

Abstract

The spatial correlation function between directional microphones is useful in the design and analysis of the performance of these microphones in actual acoustic noise fields. These correlation functions are well known for omnidirectional receivers, but not well known for directional receivers. This paper investigates the spatial correlation functions for N^th-order differential microphones in spherically isotropic noise fields. The results are used to calculate the amount of achievable cancellation from an adaptive noise cancellation application using combinations of differential microphones to remove unwanted noise from a desired signal. The results are also useful in determining signal-to-noise ratio gains from arbitrarily positioned differential microphone elements in microphone array applications

Keywords

acoustic correlation; acoustic field; acoustic noise; acoustic receivers; acoustic transducer arrays; adaptive signal processing; interference suppression; microphones; N^th-order differential microphones; acoustic noise fields; adaptive noise cancellation; design; directional microphones; microphone array applications; performance; signal-to-noise ratio gains; spatial correlation function; spherically isotropic noise fields; Acoustic noise; Adaptive systems; Coherence; Microphone arrays; Noise cancellation; Noise figure; Noise measurement; Signal to noise ratio; Wiener filter; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Signal Processing to Audio and Acoustics, 1997. 1997 IEEE ASSP Workshop on

Conference_Location

New Paltz, NY

Print_ISBN

0-7803-3908-8

Type

conf

DOI

10.1109/ASPAA.1997.625628

Filename

625628