"jh" <no@[EMAIL PROTECTED]
> wrote in message
news:no-5E8816.01585104112005@[EMAIL PROTECTED]
> Hi,
>
> I was hoping somebody here might be able to help me with a question.
> First, some background. A couple of months ago I was trying to record
> the sounds of the insides of my computer for an experimental sound
> project. I first tried it with a cheap, crappy lapel mic that came with
> a pocket voice recorder. It worked just fine.
>
> Then I borrowed a fairly nice, high quality microphone and tried it
> again. Sure enough, this microphone picked up a lot more sounds... in
> fact, it recorded all sorts of beeps, buzzes, and hums that weren't even
> there, apparently some sort of electromagnetic interference. I was
> amused to find that this high-quality microphone was much more prone to
> picking up this interference than the cheap one I tried earlier.
>
> The thing is, the interference sounds were much more interesting than
> the real sounds. Holding the microphone near the graphics card, it
> recorded different noises depending on what was being displayed on
> screen. The fans sounded like something out of a science fiction movie.
> My personal favorite sound came from the power cord while the computer
> was asleep: it made a bizarre sequence of changing pitches that repeated
> every couple of seconds.
>
> The only problem is, all of these great interference-caused phantom
> sounds were almost drowned out by the actual normal sound produced by
> the fans, hard drive, etc. in the computer. Needless to say, the
> microphone was quite adept at recording these sounds.
>
> So my question is this: is it possible to build a device, or modify a
> microphone, so that it picks up ONLY the electromagnetic interference,
> but no actual sound?
>
>
> Thanks,
> Josh
>
> p.s.: I hope people don't mind that I'm not including my real email
> address. It's probably bad etiquette, but I'm kinda paranoid about spam.
You could try using a guitar pickup instead of a microphone, they're
usually
great at picking up Radiated Frequencies. :)
Cheers,
Ric
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