Messages in this thread | | | From | John Bradford <> | Subject | Re: Want a random entropy source? | Date | Sat, 28 Dec 2002 16:00:25 +0000 (GMT) |
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> 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.
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