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I've read various methods of Fourier interpolation and extrapolation detailed in articles such as Interpolation and Extrapolation Using a High-Resolution Discrete Fourier Transform—so what I'm wondering is, has anyone actually implemented this anywhere?

I would like to experiment with extrapolating and interpolating data and audio and 2D data like pictures, if possible. Especially extrapolating.

(I would also like to know if any software is freely available.)

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    http://dsp.stackexchange.com/questions/101/how-do-i-extrapolate-a-1d-signal2011-09-16

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