Journal of Applied Science and Engineering

Published by Tamkang University Press

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Ing-Jr Ding This email address is being protected from spambots. You need JavaScript enabled to view it.1

1Department of Electrical Engineering, National Formosa University, Yunlin County, Taiwan 632, R.O.C


 

Received: July 20, 2007
Accepted: March 6, 2009
Publication Date: September 1, 2009

Download Citation: ||https://doi.org/10.6180/jase.2009.12.3.09  


ABSTRACT


In contrast to the use of fixed-length decision window for analyzing the stream of audio frames seen in many audio event detection applications, a variable-sized decision window approach is proposed in this paper. The control of the window size is governed by a fuzzy logic controller (FLC) which estimates the difference between the likelihood of a targeted audio event and that of the normal acoustic background in order to adjust the window size. The FLC is designed to stretch the window while the monitored environment remains “aurally hot” for collecting more audio frames to ensure the reliability and correctness of the detection and to do the opposite if the context gets “aurally calm”. Such a situation-dependent behavior is essential to application where reliable and real-time response is the major concern, for which the fixed-length decision window may not suffice.


Keywords: Audio Event Detection, Decision Window, Fuzzy Logic Controller, Gaussian Mixture Model, Feature Extraction


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