scholarly journals Design of Small MEMS Microphone Array Systems for Direction Finding of Outdoors Moving Vehicles

Sensors ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 4384-4398 ◽  
Author(s):  
Xin Zhang ◽  
Jingchang Huang ◽  
Enliang Song ◽  
Huawei Liu ◽  
Baoqing Li ◽  
...  
Keyword(s):  
Microphone Array ◽  
Direction Finding ◽  
Moving Vehicles ◽  
Mems Microphone

scholarly journals A Biomimetic Miniaturized Microphone Array for Sound Direction Finding Applications Based on a Phase-Enhanced Electrical Coupling Network

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3469
Author(s):  
Chien-Chang Huang ◽  
Chien-Hao Liu
Keyword(s):  
Signal To Noise Ratio ◽  
Microphone Array ◽  
Incident Angle ◽  
Power Level ◽  
Electrical Coupling ◽  
Direction Finding ◽  
Separation Distance ◽  
Mechanical Coupling ◽  
Sound Direction ◽  
Good Signal

In this research, we proposed a miniaturized two-element sensor array inspired by Ormia Ochracea for sound direction finding applications. In contrast to the convectional approach of using mechanical coupling structures for enlarging the intensity differences, we exploited an electrical coupling network circuit composed of lumped elements to enhance the phase differences and extract the optimized output power for good signal-to-noise ratio. The separation distance between two sensors could be reduced from 0.5 wavelength to 0.1 wavelength 3.43 mm at the operation frequency of 10 kHz) for determining the angle of arrivals. The main advantages of the proposed device include low power losses, flexible designs, and wide operation bandwidths. A prototype was designed, fabricated, and experiments examined within a sound anechoic chamber. It was demonstrated that the proposed device had a phase enhancement of 110 ∘ at the incident angle of 90 ∘ and the normalized power level of −2.16 dB at both output ports. The received power levels of our device were 3 dB higher than those of the transformer-type direction-finding system. In addition, our proposed device could operate in the frequency range from 8 kHz to 12 kHz with a tunable capacitor. The research results are expected to be beneficial for the compact sonar or radar systems.

Development of decomposition method of flow and sound fields around vehicle using MEMS microphone array

2019 ◽  
Vol 2019 (0) ◽  
pp. IS-04
Author(s):  
Kenta MIZUSHIRI ◽  
Tsukasa YOSHINAGA ◽  
Hiroshi YOKOYAMA ◽  
Akiyoshi IIDA
Keyword(s):  
Decomposition Method ◽  
Microphone Array ◽  
Sound Fields ◽  
Mems Microphone

Passive Acoustic Localization Based on MEMS Microphone Arrays

2015 ◽  
Vol 645-646 ◽  
pp. 517-521
Author(s):  
Xi Ming Dai ◽  
Wen Zhong Lou ◽  
Ming Ru Guo ◽  
Fu Fu Wang ◽  
Xin Jin
Keyword(s):  
Cross Correlation ◽  
Field Experiments ◽  
Microphone Array ◽  
Test System ◽  
Microphone Arrays ◽  
Time Difference Of Arrival ◽  
Practical Test ◽  
Acoustic Localization ◽  
Mems Microphone ◽  
Passive Acoustic

In this paper we used the MEMS microphone to detect the sound position. A four–microphone array was constructed to localize sound source with Time Difference of Arrival (TDoA) measurements based on hyperbola model. The time delay was calculated using Generalized Cross Correlation (GCC) algorithm. A practical test system was built to confirm the feasibility of the hyperbola model and GCC algorithm using MEMS microphone. Data were collected in field experiments and calculated on PC by matlab. The results show that the method instructed in this paper is feasible in localizing the sound position with MEMS microphone.

scholarly journals Application of MEMS Microphone Array Technology to Airframe Noise Measurements

2005 ◽  
Author(s):  
William Humphreys ◽  
Qamar Shams ◽  
Sharon Graves ◽  
Bradley Sealey ◽  
Scott Bartram ◽  
...  
Keyword(s):  
Microphone Array ◽  
Airframe Noise ◽  
Array Technology ◽  
Mems Microphone ◽  
Noise Measurements
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