基于多通道噪声消除的两级主动噪声控制算法研究

提出在传统的自适应降噪算法的基础上进行改进，发展为两级主动噪声控制( T-ANC)算法，将纯净信号作为参考信号。第一级滤波器的输出是近似的算法输入噪声，将其作为第二级滤波器的参考信号，从而在第二级滤波结束后，得到复原的纯净信号。仿真实验表明，本文提出的算法，有效的弥补了传统的主动噪声控制算法中噪声相关信号作为参考通道难以获取的情况，取得了较高的信噪比增量和降噪量，主观感受音质改善明显。

The Research of Two-Level Active Noise Control Algorithm Based on Multi-channel Noises Reduction

This paper introduces a two-level of active noise control ( T-ANC) algorithm,which uses the pure signal as reference signal. The output of the first level filter is equal to the algorithm noise approxi-mately. It is used as the reference signal of the second filter. Therefore,after going through second level filter,the output is pure signal. Simulation experiments show that the updated algorithm make up the situa-tion that the related signal is difficult to obtain effectively in the single channel ANC algorithm, and a-chieve the higher signal-to-noise ratio increment and noise reduction. The subjective quality improved obviously.