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,

Pedro

I wouldn't expect much help with the FFT side of the the 145X devices. I would hardly even classify it as being in the alpha stages of development, as things just don't work. I have been trying for a long time to get the FFT working, and there is little to no support.

Sadly to be blunt, if you truly need to do frequency domain operations, I would look elsewhere.