Thanks for all today lessons! Andrew
======= On Monday 13 December 2004 00:18, Fons Adriaensen wrote: ======= On Sun, Dec 12, 2004 at 09:03:32PM +0300, Andrew Gaydenko wrote: > Probably, the last questions today :-) > > 1. What is the meaning of the "10 * log10 (Fsample / 2)" part? It's just the frequency range expressed in dB. No = noise density = power per Hertz. No * frequency_range = noise_power. In dB, the multiply becomes an addition. And since the maximum signal level is O dB, SNR = -noise_power. > 2. When noise spectrum is approximately flat - is there > a common correlation with A-weighted value (say, "about 10db")? I have no exact value at hand, but yes, it will be something like 10 dB. Most manufacturers of sound cards give the A-weighted figure (if anything at all) -- it looks better :-) -- FA
