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FFT and Analysis Window blocks documentation

Question asked by pedromartin3z on Dec 15, 2017
Latest reply on Jun 17, 2018 by maurizio

Hi folks and analog devices employees,


I recently was recommended (See this topic) SigmaDSP processors ADAU145x and ADAU146x for an specific application which requires frequency domain analysis.


Now, I'm considering purchasing the EVAL-ADAU1466 Evaluation Kit, but first I do require further documentation about FFT and Analysis Window blocks to ascertain I will be able to develop my application.


1. As per this topic, maximum FFT size was 1024 on 2014. Has a larger FFT size (4096) been implemented?
2. Which kind of window is used on the Analysis Window? (i.e Blackman)

3. Is there a way of modifying the overlap? (i.e 25% instead of 50%)

4. How to interprete complex FFT Data? (i.e DC Frequency component, positive frequencies, negative frequencies)
5. Is data normalized? (i.e Normalization factor = 2*sum(window))


Application schematics example:


Thank you in advance,