Events Detection for Audio Based Surveillance by Variable-Sized Decision Windows Using Fuzzy Logic Control
Ing-Jr Ding · Journal of Applied Science and Engineering · 2009
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.