如何在Matlab中对数组应用低通或高通滤波器? [英] How to apply a low-pass or high-pass filter to an array in Matlab?

问题描述

是否有简单的方法将低通或高通滤波器应用于MATLAB中的数组?我对MATLAB的功能(或数学的复杂性?)有点不知所措，并且需要一个简单的功能或一些指导，因为我无法从文档或在网上找到答案.

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.

如果您只需要一个1极低通滤波器，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/t; T =样本之间的时间，τ (tau)是过滤器时间常数.

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

以下是对应的高通滤波器:

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 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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