"I've been vexed that the sound card plus CD-ROM drive combination always
shows signal at around -50 dBVU in CoolEdit. So, just for grins, I decided
to capture a few seconds of the noise and analyze the properties. 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
"That suggests to me that this would make a fair source of random samples,
especially after you slot out the interfering signal.
"How many computers don't have cheap sound cards and CD-ROM drives?"
For what it's worth...
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