如何将低通或高通滤波器应用于 Matlab 中的数组? [英] How to apply a low-pass or high-pass filter to an array in Matlab?

问题描述

是否有一种简单的方法可以将低通或高通滤波器应用于 MATLAB 中的数组?我对 MATLAB 的强大功能(或数学的复杂性?)感到有些不知所措，需要一个简单的函数或一些指导，因为我无法从文档中或在网上搜索.

Is there an easy way to apply a low-pass or high-pass filter to an array in MATLAB? I'm a bit overwhelmed by MATLAB's power (or the complexity of mathematics?) and need an easy function or some guidance as I couldn't figure it out from the documentation or searching the web.

推荐答案

查看 filter 函数.

Look at the filter function.

如果您只需要一个 1 极点低通滤波器，那就是

If you just need a 1-pole low-pass filter, it's

xfilt = filter(a, [1 a-1], x);

其中 a = T/τ，T = 样本之间的时间，并且 τ(tau) 是过滤时间常数.

where a = T/τ, T = the time between samples, and τ (tau) is the filter time constant.

这是相应的高通滤波器:

Here's the corresponding high-pass filter:

xfilt = filter([1-a a-1],[1 a-1], x);

如果您需要设计滤波器并拥有信号处理工具箱的许可证，请访问 一堆函数，看fvtool 和 fdatool.

If you need to design a filter, and have a license for the Signal Processing Toolbox, there's a bunch of functions, look at fvtool and fdatool.

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