FFT function in matlab
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Hi
i just wanted to check out something regarding the fft function in matlab?
Does the spectra produced by the fft function give amplitudes or power?
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Rick Rosson
2014 年 10 月 6 日
編集済み: Rick Rosson
2014 年 10 月 6 日
Neither. It is a straight implementation of the definition of the DFT. Depending on how you choose to scale the result, you can compute one of a variety of different forms of the spectrum. It is in general proportional to the amplitude spectrum and not the power spectrum.
What are you trying to compute using fft?
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Image Analyst
2014 年 10 月 6 日
Maybe you'd rather use pwelch() in the Signal Processing Toolbox.
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Bran
2014 年 10 月 6 日
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Rick Rosson
2014 年 10 月 7 日
Can you also post the code you have where you computed the complex values using the FFT?
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