A low-noise directional microphone system

Authors

  • Jim Ryan Gennum Corporation, 232 Herzberg Road, Kanata, Ont. K2K 2A1, Canada
  • Brian Csermak Gennum Corporation, 970 Fraser Drive, Burlington, Ont. L7L 5P5, Canada

Keywords:

Acoustic noise, Amplification, Frequencies, Hearing aids, Phase shift, Signal to noise ratio, Wave filters, Directivity index (DI), Low-noise directional systems, Noise amplification, Optional equalizer filters

Abstract

A method, Low-noise directional system, for improving the SNR in directional microphone applications, is presented. The proposed method provides the maximum directional gain for a prescribed allowable degradation in SNR. The system limits the amount of noise amplification at low frequencies by replacing the pure time delay of the conventional system with a frequency-specific phase shift. It is observed that if a high loss of SNR can be tolerated, the phase shift approaches that of a conventional directional system. It is also observed that if there is a desire to limit SNR loss, then the phase shift deviates significantly from that of a conventional system.

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Published

2004-09-01

How to Cite

1.
Ryan J, Csermak B. A low-noise directional microphone system. Canadian Acoustics [Internet]. 2004 Sep. 1 [cited 2021 Dec. 4];32(3):70-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1632

Issue

Vol. 32 No. 3 (2004)

Section

Proceedings of the Acoustics Week in Canada

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