scholarly journals Acoustic Source Localization via Subspace Based Method Using Small Aperture MEMS Arrays

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Xin Zhang ◽  
Enliang Song ◽  
JingChang Huang ◽  
Huawei Liu ◽  
YuePeng Wang ◽  
...  
Keyword(s):  
Microphone Arrays ◽  
Portable Devices ◽  
Frequency Error ◽  
Acoustic Source ◽  
Wind Noise ◽  
Small Aperture ◽  
Acoustic Source Localization ◽  
Mems Microphone ◽  
Localization Performance ◽  
Array Aperture

Small aperture microphone arrays provide many advantages for portable devices and hearing aid equipment. In this paper, a subspace based localization method is proposed for acoustic source using small aperture arrays. The effects of array aperture on localization are analyzed by using array response (array manifold). Besides array aperture, the frequency of acoustic source and the variance of signal power are simulated to demonstrate how to optimize localization performance, which is carried out by introducing frequency error with the proposed method. The proposed method for 5 mm array aperture is validated by simulations and experiments with MEMS microphone arrays. Different types of acoustic sources can be localized with the highest precision of 6 degrees even in the presence of wind noise and other noises. Furthermore, the proposed method reduces the computational complexity compared with other methods.

Design of Centrally Supported Biomimetic MEMS Microphone for Acoustic Source Localization

2015 ◽  
Author(s):  
Asif Ishfaque ◽  
Byungki Kim
Keyword(s):  
Source Localization ◽  
Squeeze Film ◽  
Directional Sensitivity ◽  
Acoustic Source ◽  
Ormia Ochracea ◽  
Biologically Inspired ◽  
Great Ability ◽  
Acoustic Source Localization ◽  
Mems Microphone ◽  
One Step

Biologically inspired unique perforated diaphragm architecture for acoustic source localization has been designed. The merely 500 μm separated structure of ears of fly Ormia ochracea which increases the interaural time and intensity differences of arriving sound has great ability to enhance the acoustic source localization. This remarkable capacity of fly to amplify direction cues for incoming sound along with squeeze film damping effects are the key inspirations for designing the diaphragm. In this design, we maintain a unique ratio between the number of holes and the diaphragm size and enhanced the acoustic directional sensitivity cues. A mechanical structure based on the ears of fly Ormia ochracea is modeled and the response is observed on different frequencies by considering the critical damping value and also on zero damping value. In one step further a perforated diaphragm is designed utilizing ANSYS software and is examined with fluid elements to estimate the damping value. A harmonic analysis is carried out in conjunction with estimated damping value 0.3325 and also on zero damping value. The figured results are very much similar to the modeled results and a range of 1 nm to 472 nm amplitude differences between two sides of the diaphragm is observed over the entire range of the frequency in damping case.

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