一种基于虚拟传感的双通道主动降噪方法

A Dual-channel Active Noise Reduction Method Based on Virtual Sensing

在主动噪声控制系统中,有效降噪范围受通道数量的影响很大,传统方式主要是通过增加系统通道数量来扩大有效降噪范围(3 dB以上),成本较高,且对计算能力要求极高。为实现在不增加通道数、误差传感器及扬声器数量的情况下,扩大有效降噪范围,使用了一种基于虚拟误差传感的方法,在FxLMS双通道主动噪声控制系统中研究虚拟传感器设置的位置与有效降噪范围的关系。结果表明:在虚拟传感器设置为不同位置时,有效降噪范围由12 cm增加到26 cm。

In an active noise control system,the effective noise reduction range is greatly affected by the number of channels.The traditional method is to expand the effective noise reduction range(above 3 dB)by increasing the number of channels in the system,which has high cost and extremely high demand for computing capability.In order to increase the effective noise reduction range without increasing the number of channels,error sensors and speakers,the relationship of the location of virtual sensor and the effective noise reductions range was investigated in FxLMS dual-channel active noise control system by using a method based on virtual error sensing.The results shows that when the virtual sensor is set at different positions,the effective noise reduction range from 12 cm increases to 26 cm.