Abstract
An optimized automatic gain controller (AGC) to improve the performance of a recursive least mean squares (LMS) adaptive filter for an active noise control application is designed and implemented. The gain is self-adjusted over a broad range (40 dB), and considerable changes in amplitude produced by electromechanical resonances can be controlled for the adaptive infinite impulse response (IIR) filter. Experiments of noise attenuation system show that the behavior of the recursive LMS adaptive filter with this optimized AGC is improved in terms of stability and convergence rate during a frequency sweep in an acoustic duct. The controller allows the attenuation of strong signals. An input test signal with abrupt changes of 10 dB at each step (from 0 to 40 dB) is made, and it is controlled without changes in the performance of the recursive LMS filter. >
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