How to plot envelope of a signal

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Ying Wu
Ying Wu 2022-10-3
评论： Ying Wu 2022-10-4
Hi, I have trouble in plotting a smooth envelope of a signal using the envelope function in Matlab or the hilbert method. The time series of my signal is shown below and I want to obtian the red line to link the peak values.
But using envelope() function or hilbert method, I plot something like
Can anyone help me to solve this questions? Thanks!
I attach my data here.

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Chunru
Chunru 2022-10-4
Ran in:
load t.mat
load signal.mat
whos
Name Size Bytes Class Attributes ans 1x35 70 char cmdout 1x33 66 char signal 40001x1 320008 double t 40001x1 320008 double
plot(t, signal);
hold on
[yupper,ylower] = envelope(signal,1000, 'peak');
plot(t, yupper, 'r--', t, ylower, 'g--')
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Chunru
Chunru 2022-10-4
There is not a one-for-all method for envelope detection when noise is added. You can try to adjust the window size for your new signal to see if you can obtain a good result.

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