Directional microphone array for security applications

Cobb, Benjamin Jon (2006) Directional microphone array for security applications. [USQ Project] (Unpublished)

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Abstract

This project investigates the potential for microphone arrays within a security setting, particularly through exploiting their ability to change their directivity pattern, thus, changing its direction of hearing. In single microphone systems speech and other signals of interest can be severely degraded when recorded in real environments. Security and surveillance systems are no exception to this rule and therefore microphone arrays have the potential to supplement the range of listening devices already available. This dissertation presents the work covered, which includes: • The potential need for microphone arrays in security settings. • The legal implications of using microphone arrays in surveillance. • The concepts of beamforming and the theory behind three common beamformers, including the Delay and Sum beamformer, the Adaptive Frost beamformer and the Generalized Sidelobe Canceller beamformer. • Tests conducted on the beamformers to determine their performance with different parameters and different types of data. It was concluded that both the Frost beamformer and the Generalized Canceller both have the potential to be used in a security setting. The best performance was achieved with the Frost beamformer with an array size of eight microphones and a tapped-delay length of 131.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering
Date Deposited: 11 Oct 2007 01:05
Last Modified: 02 Jul 2013 22:44
Uncontrolled Keywords: microphone; smart sensor enabled neural threat recognition and identification system (SENTRI); GSC; beamforming
Fields of Research (FOR2008): 08 Information and Computing Sciences > 0803 Computer Software > 080399 Computer Software not elsewhere classified
09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/2412

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