ACTIVE NOISE REDUCTION DEVICE AND ACTIVE NOISE REDUCTION METHOD

摘要

An active noise reduction device is used together with a secondary noise source which emits a secondary noise, and an error signal source which outputs an error signal which corresponds to a residual sound arising from interference between the secondary noise and a noise. A µ adjustment unit computes a step-size parameter which updates a filter coefficient of an adaptive filter unit, by multiplying a ratio of a reference representative input value corresponding to a signal amplitude to a representative input value corresponding to this signal amplitude by a reference step-size parameter.