Based on the closed-form solution of a one-dimensional wave equation, the primary, secondary and acoustic feedback paths for the active control of sound in an acoustic duct have been investigated. Accurate models for the condenser microphone and loudspeaker, which include both the electro-mechanical and mechano-acoustical couplings as well as acoustical damping, have been considered. A generalized form of the filtered-x least mean square (FXLMS) algorithm that uses a more general recursive adaptive weight update equation to improve the performance of the FXLMS algorithm has been developed. Computer simulations were carried out to investigate the performance of acoustical feedback and feedback neutralization as well as the effect of boundary conditions on the performance of active noise control (ANC) systems. Comparisons of the simulation results were carried out.

Issue Section:
Technical Papers
Keywords:
active noise control, feedback, damping, feedforward, least mean squares methods
Topics:
Acoustics, Algorithms, Boundary-value problems, Ducts, Feedback, Feedforward control, Noise control, Modeling, Microphones, Errors, Damping, Signals, Loudspeakers, Simulation results
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