Auxiliary Noise Power Scheduling Based on Gradient of Error Power for Pre-inverse Active Noise Control

摘要

Filtered-x active noise control (ANC) with power scheduling has been proposed for noise control. However, filtered-x ANC is not guaranteed to be stable. In addition, the conventional power scheduling cannot reduce the power of auxiliary noise enough after convergence. The dispersion of obtained gain is too large, and then the convergence becomes late. In order to solve the problems, we propose a type of pre-inverse ANC with the power scheduling based on gradient of error power. The proposed system uses a flat delayed signal instead of a filtered input signal unlike filtered-x ANC. It therefore reduces noise while maintaining stability. The proposed power scheduling can restrain the dispersion of gain due to system stability.