[sdiy] ye olde sawtooth

[Sebastian Kuehnl]

Can someone give hints on why a "falling" sawtooth is perceived brighter in
pitch and timbre than a "rising" (ramp) sawtooth? First one might think it's
the 90° attack click, but what has positive or negative amplitude/ distribution
of AC to do with my hearing sense? Yes it sounds the same under my headphones
when inverting or reversing the waves; of course the impression can change
(swap) through phase differences due to room positioning; I haven't tried what
it's like when standing on my head, though... I suspect I'm simply ignorant of
a fundamental physycal law here.

Try it with a ringmodulator whose inputs are a sinewave and a square detuned <
a semitone from each other; the output being a morph from rectified (DC) sine
to saw then phase inverting the same. I recall a study on ramp/ saw perception
mentioned somewhere but can't find it. Thanks for input and hopefully this
message arrives this year.

Sebastian Kuehnl

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