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Finding harmonic amplitudes of a sine wave

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Syed AWM
Syed AWM 2020-9-24
评论： Image Analyst 2020-10-3
I have got a sine wave as below, where I want to extract the amplitude of different harmonics from a data vector in matlab. can someone help me how to do it (other than fft maybe)?
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Asad (Mehrzad) Khoddam
Asad (Mehrzad) Khoddam 2020-10-1
Do you want to fit the data into a sine wave (single harmonic) ?
Syed AWM
Syed AWM 2020-10-1
no, I just need the amplitude of different harmonics

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回答（1 个）

Image Analyst
Image Analyst 2020-10-1
Looks like that is a pure sine wave with no harmonics. How did you generate it? Why do you think there are any harmonics? None are visible to me. Do the higher harmonics just have super small power - too small to be seen at the scale of the graph you have drawn?
Anyway, I'd try using findpeaks() if you want to do it in the time/spatial domain instead of using fft() or pwelch() to do it in the frequency domain.
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Image Analyst
Image Analyst 2020-10-3
Syed, I assume you've had time by now to try this, but you forgot to get back to us. Did it work?

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