A Novel Method for the Application of Adaptive filters for Active Noise Control System

Abstract

This paper introduces one novel method for active noise control .Though use of filtered-X LMS FIR Adaptive Filter mature in the literature ,this expression illustrates the application of adaptive filters to the attenuation of acoustic noise via active noise control. The reference signal is a noisy version of the undesired sound measured near its source. We shall use a controller filter length of about 44 msec and a step size of 0.0001 for these signal statistics. The resulting algorithm converges after about 5 seconds of adaptation. We also realize adaptive algorithm using IIR filter with active noise to overcome the ability of acoustic feedback . The direct form IIR filter structure, which faces the difficulties of checking stability and of relatively slow convergence speed for noise composed of narrow band components with large power inequality. To overcome these difficulties along with using the direct form IIR filters filtered-u LMS algorithm is used.