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

Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
Tue, 15 Sep 1998 10:05:58 +0200 (CEST)

On 15 Sep 1998, Michael Shields wrote:
> In article <6tk3em$can$1@palladium.transmeta.com>,
> hpa@transmeta.com (H. Peter Anvin) wrote:
> > With what, 3 dB of noise margin? (I think the quantization noise
> > floor is -3.32 dB per bit.)
>
> It must be more than that, or else have another variable; 16-bit CD
> players are routinely speced at 90 dB.

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.

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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