双通道室内主动降噪器设计

Design of Double Channel Indoor Active Noise Reducer

为实现低成本与无穿戴的室内低频噪声控制,以多通道FXLMS算法为基础,通过安装误差传感器于普通座椅的双耳侧,并通过离线建模获得次级通道模型的方法设计了一种双通道主动降噪器。实验表明,该降噪器对200~800 Hz的单频噪声及双频混合噪声降噪量能达到20 dB,对40~100 Hz方波噪声降噪量能达到10 dB,对机械旋转噪声降噪量能达到6 dB,对鸣笛声降噪量能达到9 dB,能满足一般的室内个人降噪需求。

In order to realize indoor low-frequency noise control with low cost and without wearing,based on the multi-channel FXLMS algorithm,a two-channel active noise reducer was designed by installing an error sensor on the ear side of common seats and obtaining a secondary channel model through offline modeling.Experiments show that the noise reducer can reduce single-frequency noise and dual-frequency mixed noise of 200~800 Hz by 20 dB,square wave noise of 40~100 Hz by 10 dB,mechanical rotation noise by 6 dB,and honking noise by 9 dB,which can meet the general indoor individual noise reduction requirements.