Title :
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
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.115968
