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A comment on Why is it a bad idea to filter by zeroing out FFT bins? (2020). Parent comment

Re:Why is it a bad idea to filter by zeroing out FFT bins? (... by vmilner on Monday May 10, 2021 @02:11PM (#27109007)
Quite. So I'm puzzled by what mistake the 'skilled programmers' are making, when confusing DFT and FFT. Implementing DFT in quadratic time?
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