Hello,
I’m using the envelope function with ‘peak’ option, [yupper,ylower] = envelope(x,np,’peak’).
The description says, ‘The envelopes are determined using spline interpolation over local maxima separated by at least np samples.’
I’m wondering that what order is used in the spline interpolation and also how the local maxima are calculated, separated by ‘at least’ np samples.
If I can, I would like to know the algorithm too.
Thank you.Hello,
I’m using the envelope function with ‘peak’ option, [yupper,ylower] = envelope(x,np,’peak’).
The description says, ‘The envelopes are determined using spline interpolation over local maxima separated by at least np samples.’
I’m wondering that what order is used in the spline interpolation and also how the local maxima are calculated, separated by ‘at least’ np samples.
If I can, I would like to know the algorithm too.
Thank you. Hello,
I’m using the envelope function with ‘peak’ option, [yupper,ylower] = envelope(x,np,’peak’).
The description says, ‘The envelopes are determined using spline interpolation over local maxima separated by at least np samples.’
I’m wondering that what order is used in the spline interpolation and also how the local maxima are calculated, separated by ‘at least’ np samples.
If I can, I would like to know the algorithm too.
Thank you. envelope, algorithm MATLAB Answers — New Questions

​