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What's that sound

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Unosuke:
Does anyone know if theres an official name for that sond some electronics make? Its like a "bweeeeeeeeeeeeeeeee" think the night vision goggles from Splinter Cell.

(ya, I wasn't sure if this was the right forum or not)

jhocking:
I don't know about an official name, but one cool tidbit is that the frequency is tied in to the frequency of the electricity powering the device.  I was thinking about this yesterday because I noticed that the noises from the air-conditioner and from my vacuum resonate to an irritating squeal.

I be curious: why do you want to know?

ADDITION: A quick google search suggests that the name is "electric hum," or simply "hum," since techniques to reduce the noise go by names like "hum-cancellation" or "humbucking."

Unosuke:
I wanna set it up as the start up noise on my computer.

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