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What is the formula for the peak envelope created in MatLab?

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Minoru Hoshiyama
Minoru Hoshiyama 2023-6-27
评论： Minoru Hoshiyama 2023-6-27
What is the original formula for the peak envelope created in MatLab?
envelope(a,b,'peak')
I don't know if it uses a Hilbert transform or not.

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回答（2 个）

Nikhil
Nikhil 2023-6-27
Hey Minoru,
You can get the reference from this page for peak envelope: https://in.mathworks.com/help/signal/ref/envelope.html .
Hope this will help you out.
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Minoru Hoshiyama
Minoru Hoshiyama 2023-6-27
Hi,
I missed the first paragraph on the page you mentioned. It has been resolved.
Thank you very much for your prompt attention.
Minoru

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Jacob Mathew
Jacob Mathew 2023-6-27
Hi Minoru,
This is the link to the documentation of evelope function: https://in.mathworks.com/help/signal/ref/envelope.html
Under the Description Tab, it is mentioned as follows:
[yupper,ylower] = envelope(x)
Here the description mentions that it returns the upper and lower envelopes of the input sequence, x, as the magnitude of its analytic signal. The analytic signal of x is found using the discrete Fourier transform as implemented in hilbert. The function initially removes the mean of x and adds it back after computing the envelopes. If x is a matrix, then envelope operates independently over each column of x.
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Minoru Hoshiyama
Minoru Hoshiyama 2023-6-27
Hi,
I missed the first paragraph on the page you mentioned. It has been resolved.
Thank you very much for your prompt attention.
Minoru

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