[Discuss-gnuradio] question regarding usrp_fft.py

[adib_sairi]

Good day to all,

   i have some question regarding the y-axis in usrp_fft.py.. it is labeled
in unit dB. so how does it convert from ADC value to dB? the output from
after c2mag block we got the magnitude value of the power isn't it? so how
does from the ADC value it convert to the power? what is the formula? 

second, what is this formula mean? 
  log = gr.nlog10_ff(10, self.fft_size,
-20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size)). i think
this is to convert from power in magnitude domain to dB.. is it? what is the
actual formula on this? thank you very much in advance

Adib
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