lkml.org 
[lkml]   [2002]   [Dec]   [28]   [last100]   RSS Feed
Views: [more markup]   [less markup]   [headers]   [forward]  
 
Messages in this thread
/
FromJohn Bradford <>
SubjectRe: Want a random entropy source?
DateSat, 28 Dec 2002 16:00:25 +0000 (GMT)
> I was astonished to see that the resulting signal is a white-noise
> pattern with a slight emphasis at the high end (when sampled at 44
> kilosamples per second). In short, it looks like diode noise with a
> 4 kilohertz square wave thrown in.

> "That suggests to me that this would make a fair source of random samples, 
> especially after you slot out the interfering signal.

How can you guarantee that you are sampling noise, though, what if a
sound card was picking up 50 Hz mains hum, for example,  that would
de-randomise the data quite a bit.

> "How many computers don't have cheap sound cards and CD-ROM drives?"

I have never understood how a 16-bit DAC or ADC can have noise above
96 dB.  Surely _by definition_ a 16-bit DAC or ADC is one that does
not have noise above that level.

John.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 11:31    [from the cache]
©2003-2008