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Originally Posted by LemonyBrainAid
My space bar sounds different to Nemmy's, so you'd have to know the keyboard properly first, I reckon'
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Think it works on inverse square law and positioning. As you increase the distance between a sound source or even a wave source the intensity decreases exponentially.
Placing a microphone in a known place and measuring sound intensity, plus a tad of algebraic manipulation, can *easily* determine which keys are pressed. The intensity is the key to the distance away and by putting it in a certain position, the direction factor is minimised so they can guess the keypress order.
It's nothing to do with how the KB sounds.