It has been a while since I study DSP, so I'm not sure if FFT can mathematically... | Hacker News

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fireattack on Nov 10, 2019 | parent | context | favorite | on: Audio Processing for Dummies

It has been a while since I study DSP, so I'm not sure if FFT can mathematically recover all the original sine waves (FT can). But I don't think it is possible practically, at least.

kortex on Nov 10, 2019 [–]

Yes, if you use the FFT or any discrete FT, you can perfectly recreate the signal up to the Nyquist frequency. To perfectly recreate the whole signal, you'd need infinite Fourier coefficients.

fireattack on Nov 11, 2019 | [–]

Thanks

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