Re: NEWSFLASH! Linux ported to Commodore VIC-20!!

Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
Tue, 15 Sep 1998 10:36:45 +0200 (CEST)

On Tue, 15 Sep 1998, H. Peter Anvin wrote:
> > Yes, it's about the double. For signal power you need the square of the
> > amplitude. For 1 bit you have:
> >
> > 10*log10(2^2) = 20*log10(2) = 6.02 dB
> >
> > Since 16 bit CDDA is signed, the SNR is 20*log10(2^15) = 90.31 dB.
>
> The signedness doesn't matter, it's just a DC offset. I think you
> need to do 20*log10(2^16).

I should have written PSNR (Peak Signal to Noise Ratio). The absolute value of
the peak signal is 2^15. Well, you'll find both SNR and PSNR in various CD
manuals. So either 96 or 90 dB.

Greetings,

Geert

--
Geert Uytterhoeven                     Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP}  http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium




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