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2 points

It’s just a low pass filter. Since human speech is massively out of the frequency range of a fan, you can just delete that whole frequency wholesale.

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2 points
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Audacity (or Audition/Cool Edit how the old guys know it) is a bit smarter. It can analyze a recording of the noise floor and then just attenuate that. It’s bad for quality music but good enough to improve speech, old tape recordings and records.

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