Experimental results showing the effects of optimal spacing between elements of a linear microphone array

Author

Alvarado, Victor ; Silverman, Harvey

Author_Institution

Lab. for Eng. Manuf. Machine Syst., Brown Univ., Providence, RI, USA

fYear

1990

fDate

3-6 Apr 1990

Firstpage

837

Abstract

Stochastic region contraction is applied to an improved field model which includes attenuation due to the source-to-microphone distance, and a new optimal spacing is derived. The performances of equispaced, logarithmically spaced, old-model optimal, and new-model optimal arrays were measured experimentally and are compared to the results predicted from the mathematical model. The shape of the power distribution of the received signal in the near field of the array is verified in general. The differences are due to echoes, background noise, nonideal microphone beam patterns, and other variables that were not included in the model

Keywords

audio recording; microphones; spectral analysis; speech recognition; stochastic processes; linear microphone array; optimal spacing; power distribution; power spectral dispersion; source-to-microphone distance; speech recognition; stochastic region contraction; Attenuation; Background noise; Computational modeling; Delay; Laboratories; Mathematical model; Microphone arrays; Microphones; Optimization methods; Performance evaluation; Power distribution; Shape; Simulated annealing; Stochastic processes; Systems engineering and theory;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Conference_Location

Albuquerque, NM

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1990.115968

Filename

115968