On 03/10/2018 05:22 PM, Dirk Gorissen wrote:
Hi All,
This should be a simple question. I have the following:
sdr -> decimation/filters -> stream to vector -> FFT -> complex to
mag2 -> log10 -> python block - > ...
The FFT block is configured as:
type: complex
Direction: Forward
Shift: yes
length: equal to input vector length
The python block should be trivial in that it just snips out a subset
of the FFT bins (around the center frequency).
My assumption was that the center frequency is at the middle bin
(Shift = True) and that if I want +/- 500Hz (for example) I can just
take the bins (middle bin index - 500) -> (middle bin index + 500)
However that does not seem correct. Perhaps there is a bug somewhere
else but just wanted to check Im doing the right thing.
Cheers
Dirk
Your assumption would only be correct if your FFT resolution was 1Hz/bin.
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