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Active Control of Noise in Ducts Using Stabilized Multi-Channel RLMS Filters  

Nam Hyun-Do (단국대학교 공과대학 전기공학과)
Nam Seung-Uk (단국대학교 대학원 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.55, no.8, 2006 , pp. 375-377 More about this Journal
Abstract
An adaptive IIR filter in ANC(Active Noise Control) systems is more effective than an adaptive FIR filter when acoustic feedback exists, in which cause an order of an adaptive FIR filter must be very large if some of poles of the ideal control filter are near the unit circle. But the IIR filters may have stability problems especially when the adaptive algorithm for adaptive filters is not yet converged. In this paper, a stabilized multi-channel recursive LMS (MCRLMS) algorithm for an adaptive multi-channel IIR filter is presented. RLMS algorithms usually diverge before the algorithm is not yet converged. So, in the beginning of the ANC system, the stability of the RLMS algorithms could be improved by pulling the poles of the IIR filter to the center of the unit circle, and returning the poles to their original positions after the filter converges. Computer simulations and experiments for dipole ducts using a TMS320C32 digital signal processor have performed to show the effectiveness of a proposed algorithm.
Keywords
Active Noise Control; Duct; Adaptive IIR Filter; Multi-Channel RLMS; Stabilization;
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