Modeling the Saturation Effects for Narrowband Active Noise Control Systems

Fu-Kun CHEN  Chih-Wei CHEN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E92-A   No.11   pp.2922-2926
Publication Date: 2009/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E92.A.2922
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Digital Signal Processing
active noise control (ANC),  saturation effect,  feedforward ANC systems,  feedback ANC systems,  analog to digital converter (ADC),  

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Based on the theoretical analysis of literature, saturation in measured signal of active noise control (ANC) systems will degrade the convergence speed. However, the experiments show that the saturated input signal can speed up the convergence of the narrow-band ANC systems. This paper intends to remodel the saturation effects for feedforward and feedback ANC systems. Combining the action of analog-to-digital converters (ADC), the mathematical expression and block diagrams are proposed to model the saturation effects in the practical ANC systems. The derivation and simulation results show that since the saturation is able to amplify the principle component of signal, the convergence would be speeded up.