Directional microphone array for security applications

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


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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
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering (Up to 30 Jun 2013)
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 (2008): 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
Fields of Research (2020): 46 INFORMATION AND COMPUTING SCIENCES > 4699 Other information and computing sciences > 469999 Other information and computing sciences not elsewhere classified
40 ENGINEERING > 4006 Communications engineering > 400607 Signal processing
40 ENGINEERING > 4008 Electrical engineering > 400899 Electrical engineering not elsewhere classified

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