Operation principle of the digital wave filter and application in the field of digital sound result, discuss IIR wave filter, FIR wave filter design method.

数字滤波器的工作原理以及在数字音效领域的应用，讨论IIR滤波器、FIR滤波器的设计方法。

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We analyze rejecting periodic interference in PD monitoring on line through cascade IIR digital wave notch filter. The principle and simple design method are proposed and discussed.

在分析用IIR陷波滤波器来抑制局部放电在线监测中周期性干扰的基础上，提出和论述了级联式II R陷波滤波器基本原理及简明设计方法。

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