Estimation of aircraft angular coordinates using a directional-microphone array—An experimental study

2015 ◽  
Vol 137 (4) ◽  
pp. 1914-1922 ◽  
Author(s):  
Meritxell Genescà ◽  
U. Peter Svensson ◽  
Gunnar Taraldsen
Keyword(s):  
Experimental Study ◽  
Microphone Array ◽  
Directional Microphone ◽  
Angular Coordinates

Performance of a highly directional microphone array in a multi-talker reverberant environment

2013 ◽  
Author(s):  
Sylvain Favrot ◽  
Christine R. Mason ◽  
Timothy M. Streeter ◽  
Joseph G. Desloge ◽  
Gerald Kidd
Keyword(s):  
Microphone Array ◽  
Directional Microphone ◽  
Reverberant Environment

Assessment of a directional microphone array for the hard‐of‐hearing

1990 ◽  
Vol 88 (S1) ◽  
pp. S169-S169 ◽  
Author(s):  
W. Soede ◽  
F. A. Bilsen ◽  
A. J. Berkhout
Keyword(s):  
Hard Of Hearing ◽  
Microphone Array ◽  
Directional Microphone

Improved BTE hearing‐aid directivity using a directional microphone array

2004 ◽  
Vol 115 (5) ◽  
pp. 2598-2598
Author(s):  
Douglas L. Jones ◽  
Michael E. Lockwood ◽  
Charissa R. Lansing ◽  
Albert S. Feng
Keyword(s):  
Microphone Array ◽  
Hearing Aid ◽  
Directional Microphone

scholarly journals Experimental Study of Airfoil Leading Edge Combs for Turbulence Interaction Noise Reduction

Acoustics ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 207-223 ◽  
Author(s):  
Thomas Geyer ◽  
Sahan Wasala ◽  
Ennes Sarradj
Keyword(s):  
Experimental Study ◽  
Noise Reduction ◽  
Microphone Array ◽  
Pressure Fluctuations ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Airfoil Surface ◽  
Low Frequencies ◽  
High Frequencies ◽  
Turbulent Eddies

The interaction of a turbulent flow with the leading edge of a blade is a main noise source mechanism for fans and wind turbines. Motivated by the silent flight of owls, the present paper describes an experimental study performed to explore the noise-reducing effect of comb-like extensions, which are fixed to the leading edge of a low-speed airfoil. The measurements took place in an aeroacoustic wind tunnel using the microphone array technique, while the aerodynamic performance of the modified airfoils was captured simultaneously. It was found that the comb structures lead to a noise reduction at low frequencies, while the noise at high frequencies slightly increases. The most likely reasons for this frequency shift are that the teeth of the combs break up large incoming turbulent eddies into smaller ones or that they shift turbulent eddies away from the airfoil surface, thereby reducing pressure fluctuations acting on the airfoil. The aerodynamic performance does not change significantly.

32-Channel Omni-Directional Microphone Array Design and Implementation

2011 ◽  
Vol 23 (3) ◽  
pp. 378-385 ◽  
Author(s):  
Yoko Sasaki ◽  
◽  
Tomoaki Fujihara ◽  
Satoshi Kagami ◽  
Hiroshi Mizoguchi ◽  
...  
Keyword(s):  
Microphone Array ◽  
Sound Sources ◽  
Directional Characteristic ◽  
Array Design ◽  
Design And Implementation ◽  
Directional Microphone ◽  
Reverberant Environments ◽  
Basic Performance ◽  
Exogenous Noise ◽  
Array Performance

This paper presents the design and evaluation of a microphone array. The proposed evaluation index is the directional characteristic of delay and sum beamforming, which is used to optimize the microphone array design. Using beamforming simulation, a microphone arrangement that minimizes sidelobes and improves the basic performance of beamforming is selected. The new hardware has omni-directional directivity and high tolerance for exogenous noise. It has 32 microphones on a 335-mm diameter disk designed to be mounted on a mobile robot. The microphone array performance is verified in different real environments. Experimental results in indoor/outdoor sound localization show the effectiveness of the array in reverberant environments and its robustness against different pressure sound sources for covering larger areas.

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