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Active Noise Control Using IIR Adaptive Filter

Author(s): Rintu S Abraham | Veena S

Journal: International Journal of Engineering and Advanced Technology
ISSN 2249-8958

Volume: 1;
Issue: 6;
Start page: 55;
Date: 2012;
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Keywords: ANC | FIR | IIR

Noise control is essential from the point of view ofhealth, conversation and communication. Traditionally reducednoise levels are achieved by means of passive absorbers like foam,perforated boards etc. But due to their size and weight, the passiveabsorbers are not suitable for mobile vehicles like aircrafts,helicopters and cars at low frequencies (50-500 Hz). This calls foran alternative technology, ACTIVE NOISE CONTROL (ANC).Generally, algorithms based on adaptive FIR structure withnumber of coefficients ranging up to hundreds are used in activenoise control and this increases the computational burden on theprocessor. Compared to FIR filters, in this project IIR filters areused that can model a physical system efficiently with less numberof coefficients due to its inherent pole-zero structure. The poles ofan IIR filter make it possible to obtain well-matched characteristicswith a lower-order structure, thus requiring fewer arithmeticoperations.
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