Re: [Discuss-gnuradio] FFT normalization issue: noise aliasing

[Marcus Müller]

Hi Jean-Michel,

yep, think about it as just a bunch of numbers: The FFT doesn't know 
anything about the physical units involved. It just maps complex vectors 
to complex vectors. So, that gives you energy per bin (which translates 
to energy per bandwidth, if you're inclined to actually think as the 
output of the FFT being a vector in frequency domain).

Best regards,
Marcus


On 10/16/2017 01:15 AM, Jean-Michel FRIEDT wrote:
> PS: the fact that reducing by 10 the number of samples in the FFT 
> rises the
> noise level by 10 dB definitely hints at dB/Hz rather than dB as 
> Y-axis unit.
>
> JM
>
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