Need help with butterworth function

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G 2018-10-26

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评论： Star Strider 2018-10-26

I am trying to use the butterworth function and I can't seem to get it working. Here is my code:

clear,clc
load('DATA_01_TYPE01.mat')
A = sig;
x = A(2,1:1000)
t=1:1:1000;
subplot(3,1,1)
plot(t,x)
N=size(x,2);
noise=0.5*randn(1,N); %noise
[b a]=butter(2, [0.6 0.7]);
noise=filter(b,a,noise);
x_n=x+noise;
subplot(3,1,2)
plot(t,x_n)

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回答（1 个）

Star Strider 2018-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/426294-need-help-with-butterworth-function#answer_343606

编辑：Star Strider 2018-10-26

I assume ‘A’ or ‘x’ is the signal you want to filter. If so, you are not giving it to the filter function to use. You are only giving it your ‘noise’ vector, so that it what it is filtering.

Also the filtfilt (link) function is preferable to filter.