When using the IFFT to compute an approximation to the IDTFT, frequency range is 0 to 2$\pi$ versus $-\pi$ to $\pi$. This produces a different impulse sequence(causal I think).

How do you calculate the correct DTFT? Why is the range 0 to $2\pi$ used for numerical calculations?

  • $\begingroup$ "freq range is 0 to 2pi instead of -pi to pi": No, it's not. That's up to you / the implementation to define. $\endgroup$ – Marcus Müller Apr 19 '19 at 13:02

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