[linux-audio-dev] JAAA Bandw parameter

[Andrew Gaydenko]

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