>> 20 Hz?
>
> That's approximately the lowest frequency that the human ear can
> mechanically detect. There's no particular reason to expect this to be in
> any way related to the rate of change in frequency spectrum that the human
> mind can percieve.
Modulate a 1 kHz tone with a N Hz square wave. At what value of N do you
cease to be able to recognise the 1 kHz tone turning on and off? I suspect
it's somewhere around 20 Hz, you could easily figure it out with a sound
editor program like Audacity.
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