Shouldn't my aliasing experiment raise the noise floor rather than keep it
constant ?
By taking only every 10th sample, you also reduce the sample rate
by a factor of 10. So you have the same power in 1/10th of the
original bandwidth. In other words, noise power per Hz has
increased by a factor of 10. This noise density (compared to
signal power) is what matters in e.g. demodulation.
which brings me back to my question indeed: is the FFT sink displaying
dB or dB/Hz (or dB/sqrt(Hz) for voltages) ? In the latter case I agree
with your statement.
Marcus: I see that I will have no other choice than to start learning the
Qt interface ... I was so used to the WX one that I never bothered. I just
checked, the result is the same on both GUI so they are consistent.
Thanks, JM
--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe,
25000 Besancon, France
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