scholarly journals A bio-inspired optical directional microphone with cavity-coupled diaphragms

2021 ◽  
Vol 1 (7) ◽  
pp. 072802
Author(s):  
Qian Dong ◽  
Xiaolei Song ◽  
Jim Shih-Jiun Chen ◽  
Albert Kim ◽  
Haijun Liu
Keyword(s):  
Directional Microphone

Performance of Directional Microphone Hearing Aids in Everyday Life

2002 ◽  
Vol 13 (06) ◽  
pp. 295-307 ◽  
Author(s):  
Mary T. Cord ◽  
Rauna K. Surr ◽  
Brian E. Walden ◽  
Laurel Olson
Keyword(s):  
Hearing Aids ◽  
Superior Performance ◽  
Directional Hearing ◽  
Directional Microphones ◽  
Use Patterns ◽  
Telephone Interviews ◽  
Directional Microphone ◽  
Perceived Performance ◽  
Level Of Satisfaction ◽  
Directional Hearing Aids

This study explored the use patterns and benefits of directional microphone technology in real world situations experienced by patients who had been fitted with switchable omnidirectional/directional hearing aids. Telephone interviews and paper-and-pencil questionnaires were used to assess perceived performance with each microphone type in a variety of listening situations. Patients who used their hearing aids regularly and switched between the two microphone configurations reported using the directional mode, on average, about one-quarter of the time. From brief descriptions, patients could identify listening situations in which each microphone mode should provide superior performance. Further, they reported encountering listening situations in which an omnidirectional microphone should provide better performance more frequently than listening situations in which the directional microphones should be superior. Despite using the omnidirectional mode more often and encountering situations in which an omnidirectional microphone should provide superior performance more frequently, participants reported the same level of satisfaction with each microphone type.

Design of a Biomimetic Directional Microphone Diaphragm

2000 ◽  
Author(s):  
C. Gibbons ◽  
R. N. Miles
Keyword(s):  
Sound Pressure ◽  
Capacitive Sensor ◽  
Sound Level ◽  
Pressure Level ◽  
The Self ◽  
Mode Shapes ◽  
Directional Hearing ◽  
The Finite Element Method ◽  
Mechanical Coupling ◽  
Directional Microphone

Abstract A miniature silicon condenser microphone diaphragm has been designed that exhibits good predicted directionality, sensitivity, and reliability. The design was based on the structure of a fly’s ear (Ormia ochracea) that has highly directional hearing through mechanical coupling of the eardrums. The diaphragm that is 1mm × 2mm × 20 microns is intended to be fabricated out of polysilicon through microelectromechanical micromachining. It was designed through the finite-element method in ANSYS in order to build the necessary mode shapes and frequencies into the mechanical behavior of the design. Through postprocessing of the ANSYS data, the diaphragm’s response to an arbitrary sound source, sensitivity, robustness, and Articulation Index - Directivity Index (AI-DI) were predicted. The design should yield a sensitivity as high as 100 mV/Pa, an AI-DI of 4.764 with Directivity Index as high as 6 between 1.5 and 5 kHz. The diaphragm structure was predicted be able to withstand a sound pressure level of 151.74 dB. The sound level that would result in collapse of the capacitive sensor is 129.9 dB.. The equivalent sound level due to the self-noise of the microphone is predicted to be 30.8 dBA.

Bio-Inspired Rectangular Shaped Piezoelectric MEMS Directional Microphone

2019 ◽  
Vol 19 (1) ◽  
pp. 88-96 ◽  
Author(s):  
Ashiqur Rahaman ◽  
Asif Ishfaque ◽  
Haeil Jung ◽  
Byungki Kim
Keyword(s):  
Directional Microphone ◽  
Piezoelectric Mems

Directional microphone

1982 ◽  
Vol 71 (2) ◽  
pp. 529-529
Author(s):  
Alfred Zlevor
Keyword(s):  
Directional Microphone

Effectiveness of Directional Microphones and Noise Reduction Schemes in Hearing Aids: A Systematic Review of the Evidence

2005 ◽  
Vol 16 (07) ◽  
pp. 473-484 ◽  
Author(s):  
Ruth A. Bentler
Keyword(s):  
Systematic Review ◽  
Noise Reduction ◽  
Hearing Aids ◽  
Small Sample Size ◽  
Careful Consideration ◽  
Small Sample ◽  
Experimental Conditions ◽  
Directional Microphones ◽  
Directional Microphone

A systematic review of the literature was undertaken to find evidence of real-world effectiveness of directional microphone and digital noise reduction features in current hearing aids. The evidence was drawn from randomized controlled trials, nonrandomized intervention studies, and descriptive studies. The quality of each study was evaluated for factors such as blinding, power of statistical analyses, and use of psychometrically strong outcome measures. Weaknesses in the identified studies included small sample size, resultant poor power to detect potentially worthwhile differences, and overlapping experimental conditions. Nine studies were identified for directional microphones, and the evidence (albeit weak) supports effectiveness. Two studies were identified for the noise reduction feature, and the evidence was equivocal. For the researcher, such a systematic review should encourage the careful consideration of appropriate methodologies for assessing feature effectiveness. For the clinician, the outcomes reported herein should encourage use of such a systematic review to drive clinical practice.

Closely Arranged Directional Microphone for Source Separation

2004 ◽  
pp. 129-135 ◽  
Author(s):  
Yusuke Katayama ◽  
Masanori Ito ◽  
Allan Kardec Barros ◽  
Yoshinori Takeuchi ◽  
Tetsuya Matsumoto ◽  
...  
Keyword(s):  
Source Separation ◽  
Directional Microphone

scholarly journals Benefit From Directional Microphone Hearing Aids: Objective and Subjective Evaluations

2015 ◽  
Vol 8 (3) ◽  
pp. 237 ◽  
Author(s):  
Hee-Sung Park ◽  
Il Joon Moon ◽  
Sun Hwa Jin ◽  
Ji Eun Choi ◽  
Yang-Sun Cho ◽  
...  
Keyword(s):  
Hearing Aids ◽  
Directional Microphone ◽  
Subjective Evaluations
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