Hi all,
Early on (late 70s) I read human hearing typically ranged from 16Hz-16KHz,
and the high frequency limit fell as one aged. Now like any amplifier, speaker
or whatnot the ear might well have a fall off at the high end (a doctor would
be best to confirm this).
I can believe a guy about 16yrs old may well hear 18KHz, 20KHz perhaps
even 22KHz for one in a thousand, but to suggest a human ear is able to detect
25KHz is madness.
> > and so could not discern the difference between these wave forms. I
> > believe that any differences you hear are either artifacts produced by
> > your function generator, in which case you should throw it in the bin,
> > or differences in the signal levels that you are perceiving as a change
> > of timbre.
> I had my hearing tested at a centre that specialises in auditory testing after I
> claimed to be able to hear things many others couldn't. Bearing in mind most of the
> doctors at his centre had more letters after their name that you could fit on the
> average MD label, and the equipment they were using was highly specilised, I doubt
> they would concurr with your assessment they were using a cheap function generator.
Question: what sort of speaker did they use to send sounds in (presumably)
the 15-30KHz region. Unless they used specialised ultrasonic transducers
there is little knowing what you were hearing. [Gaz is tempted to mention
sub-harmonics but thinks that is bull and thinks he is in enough trouble with
the ongoing Linux thread]. Me thinks their speakers were c**p, or rather
incapable of reproducing a clean 22KHz or higher signal.
There is a reason any hifi speaker has 2 or 3 (at least) elements-- each can only
give good reproduction over a limited frequency range. Anyone taking these
"how high can we hear" tests should ask
a) what speakers they use
b) how high they crank up the sound pressure level with frequency
c) couldn't we all hear a tone of 25KHz if blasted at 150dB
Cheers,
PrinceGaz -- "if it harms none, do what you will", and I do say a little more
below
Email: [EMAIL PROTECTED]
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