自适应滤波器在机械振动信号抗混叠中的应用

The design for tracking filtering circuit in anti-aliasing filtering of machine vibration signal

采用8阶开关电容滤波器和CPLD所设计的分频电路,设计了一跟踪滤波电路。解决了旋转机械在不同转速下的抗混叠滤波的问题.实现了只跟踪变化的有效信号中心频率的10倍频程.并将其它多余信号滤掉的功能.

A tracking filtering circuit is successfully developed by using a 8th-order switched-capacitor filter and dividing-frequency circuit based on CPLD. This circuit solves the problem of anti-aliasing filtering when the rotational speed of a machine is not constant. At the same time, tracking decade of effective signals' center frequenci es and filtering other unnecessary signals are realized.