![]() | ||||||||||
Messages in this thread |
Not too long ago I had made a submission on SlashDot on something-or-other (oh, right, "Rube-Goldberg Type Random Number Generators?" http://ask.slashdot.org/article.pl?sid=02/07/26/1751228&tid=137) and I stumbled across my submission to that article. After thinking about it, I though it might be a reasonable thing to submit to this list as a possible enhancement to the /dev/random driver if someone wants to try it. My submission was thus: "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 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 many computers don't have cheap sound cards and CD-ROM drives?" For what it's worth... Satch - 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 | ||||||||||