� Ethan, that's just the difference between Decimation-in-Frequency FFT and Decimation-in-Time FFT. i guess i am not entirely certainly of the history, but i credited both the DIT and DIF FFT to Cooley and Tukey.� that might be an incorrect historical impression. ---------------------------- Original Message ---------------------------- Subject: Re: [music-dsp] 2-point DFT Matrix for subbands Re: FFT for realtime synthesis? From: "Ethan Fenn" <et...@polyspectral.com> Date: Mon, November 5, 2018 10:17 am To: music-dsp@music.columbia.edu -------------------------------------------------------------------------- > It's not exactly Cooley-Tukey. In Cooley-Tukey you take two _interleaved_ > DFT's (that is, the DFT of the even-numbered samples and the DFT of the > odd-numbered samples) and combine them into one longer DFT. But here you're > talking about taking two _consecutive_ DFT's. I don't think there's any > cheap way to combine these to exactly recover an individual bin of the > longer DFT. > > Of course it's possible you'll be able to come up with a clever frequency > estimator using this information. I'm just saying it won't be exact in the > way Cooley-Tukey is. > > -Ethan > > � -- r b-j� � � � � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge." � � � �
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