![]() ![]() You can get a finer sampling (and a much nicer-looking DTFT plot) by zero-padding. The outputs of the DFT are samples of the DTFT, and in thisĬase the sample locations just happen to align with the locations of four zeros in the DTFT. What's going on? I explained this back in my March 15 post when I discussed the relationship between the DFT and the DTFT. And why does it look like it's only got two points? Well, Wow, that's not anywhere close to the DTFT magnitude plot above. Here's a plot of the DTFT magnitude of this sequence: I described the relationship between the DFT and the DTFT in my March 15 post.įor my example I'll work with a sequence that equals 1 for and equals 0 elsewhere. That the fft computes the discrete Fourier transform (DFT). Look at how to use the fft function to produce discrete-time Fourier transform (DTFT) magnitude plots in the form you might see in a textbook. In my Fourier transform series I've been trying to address some of the common points of confusion surrounding this topic.
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