active noise cancellation

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Much of the noise that occurs in my office is computer fan noise. At
least that is what I notice most. I know there is noise from the
fluorescent lights and from the CRT as well, althought I expect there
is a dropout in my hearing at that frequency now. Anyway, ...


I am wondering about the computer fan noise. Has anyone investigated
active noice cancellation for computer fans? Active cancellation is
the playing of exactly opposite sounds to cancel out the undesired
sounds.


Or is the software (I am running NatSpeak 1.0) smart enough to do
spectral subtraction anyway, so active cancellation would not really
buy anything?


Don


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