NDLI: Adaptive howling suppressor in an audio amplifier system

Content Provider	IEEE Xplore Digital Library
Author	Loctwassana, W. Punchalard, R. Lorsawatsiri, A. Kosccyaporn Wardkcin, P.
Copyright Year	2007
Description	Author affiliation: King Mongkut's Inst. of Technol. Ladkrabang, Bangkok (Loctwassana, W.)
Abstract	The acoustic feedback causes a howling phenomenon in an audio amplifier system. This problem does not only annoy hearing but also can damage an amplifier system. The IIR adaptive howling suppressor (AHS) in an audio amplifier system is thus proposed in this paper. The algorithm of adaptive process is achieved by using the variable momentum least mean square (VMLMS). With this algorithm, the performance improvement and higher convergence rate can be success. The proposed AHS, which is placed between a preamplifier section and a power amplifier section, acts as a narrow bandwidth notch filter whose frequency characteristic can reduce a howling spectrum. The simulation results show good improvement in the howling suppression of the proposed AHS system. Moreover, the performance comparisons show that the proposed system is performed over the AHS conventional FIR and FALE structures at the same environment condition.
Starting Page	445
Ending Page	448
File Size	504715
Page Count	4
File Format	PDF
ISBN	9781424413737
DOI	10.1109/APCC.2007.4433465
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-18
Publisher Place	Thailand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Automated highways Finite impulse response filter Feedback Auditory system Adaptive systems Convergence Preamplifiers Power amplifiers Bandwidth Frequency
Content Type	Text
Resource Type	Article

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