Application of the Fxlms Algorithm in Active Noise Reduction
نویسندگان
چکیده
Application of the filtered-X LMS algorithm to adaptive/active noise cancelling in headsets or hearing protectors has been investigated. The speed of convergence and amount of obtainable noise reduction was investigated for different step-size parameters and FIR filter lengths. Simple models for the headphone transfer function and the sound transmission through the ear cups are applied. We have put focus on the limitations caused by the allpass part of the transfer function of the secondary sound source, the causality problem caused by the introduction of signal processing delays, and the requirement for accuracy of the estimated transfer function of the secondary sound source.
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