Enhanced Modulation Spectrum Using Space-Time Averaging For In-Building Acoustic Signature Identification

For most buildings, virtually all subsystems such as fans, generators, and motors generate acoustic energy. This acoustic energy can weakly penetrate walls and pass through hallways and conduits. The propagation paths are complex and, given the typically low energy of received acoustic signals, pres...

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Bibliographic Details
Published in:	2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings Vol. 3; p. III
Main Authors:	Sukittanon, S., Atlas, L.E., Dame, S.G.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 2006
Subjects:	Acoustic arrays Acoustic propagation Acoustic sensors Acoustic signal detection Attenuation Fans Frequency Power system harmonics Sensor arrays Signal representations
Online Access:	Get full text
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Summary:	For most buildings, virtually all subsystems such as fans, generators, and motors generate acoustic energy. This acoustic energy can weakly penetrate walls and pass through hallways and conduits. The propagation paths are complex and, given the typically low energy of received acoustic signals, present challenges for the detection and classification of the subsystems. While conventional approaches would not be expected to work under these difficult conditions, a key observation can be made: these types of subsystems produce line spectra which consist of harmonics of a fundamental frequency. Acoustic propagation effects then strongly affect the relative energy of these harmonics. Modulation spectra, which make use of the frequency spacing instead of the relative energy of the harmonics, are especially insensitive to these frequency-dependent acoustic attenuation affects. When combined with temporal averaging and 3-dimensional spatial (over an array of acoustic sensors) processing, enhanced modulation spectra offer a new approach to the detection and classification of building subsystems which produce sound
ISBN:	9781424404698 142440469X
ISSN:	1520-6149 2379-190X
DOI:	10.1109/ICASSP.2006.1660613