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General audio topics that don't fit into specific categories.

Not a really easy subject to discuss

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In working with "ultrasonic" frequencies, there are lots of traps. One is that many (most) transducers do things you don't expect, and move signal down into audible frequency ranges.

Another is frequency shaping left over from some pole or something in a system, that, while the POLE may be "out of band" the frequency shaping or phase response isn't.

Finally, while all the signal above 20kHz lands on the same first mm of the basilar membrane, which is usually destroyed by the time you're about 6 years old in the modern world, that doesn't prove complete inaudibility, only that something is mostly audible. Thing is, downward spread of energy is NOT very substantial on the cochlea, so it's not very likely that that's what is going on, but there are some very interesting FILTER issues, that perhaps I can finally resolve some day, we'll see.



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