线谱噪声有源控制算法比较

Comparison of narrowband active noise control algorithms

线谱噪声通常是由一些带旋转部件的设备来回往复运动产生的。这些噪声具有明显的周期性或者近似周期性。介绍了传统的窄带前馈有源控制算法和频率合成法。传统的有源控制方法通过直接拾取参考信号直接来进行有源噪声控制,频率合成法针对某些特定频率或者参考信号无法获取时,通过系统自身产生参考信号来完成有源噪声控制。对这两种方法进行了仿真与比较,分析结果表明,频率合成法可以更有效地对线谱噪声进行控制,且多个频率之间互不干扰。

Narrowband noise is usually caused by the reciprocating motion of some equipment with rotating parts. These noises have obvious or approximate periodicity. The traditional narrowband feedforward active control algorithm and frequency synthesis method are introduced. The traditional active control method directly controls the active noise by picking up the reference signal. The frequency synthesis method can control the active noise by generating the reference signal by the system itself when some specific frequency or reference signal can not be obtained. The two methods are simulated and compared. The analysis results show that the frequency synthesis method can control the narrowband noise more effectively, and there is no interference among multiple frequencies.