[music-dsp] Fw: A little question about DSP performance
didid at skynet.be
Fri Oct 2 19:40:53 EDT 2009
> On Oct 2, 2009, at 11:28 AM, Didier Dambrin wrote:
>> That harmonic is at 2500hz so it can't really be a matter of age.
> oh c'mon, Didier! <begin sob story> i dunno how old you are but i'm
> pushing 54, my dad wore hearing aids in his later years, i grew up
well he said he was 40, I'm 35, I don't think a 'normal' hearing decline can
make you not hear 2500hz at 40.
(still up to 15-16khz here)
> listening to loud rock 'n roll in the 70s (like big loud Blue Oyster
> Cult concerts long before the Reaper), i've already been tested and
> i'm down 30 dB at 4 kHz in one ear and down 10 in the other. <end
> sob story> i do not count myself as an authority in a tough
> listening test, and in fact, i can't hear a difference at all. now,
> because it's tough, we wouldn't be intellectually honest enough if we
> didn't settle the fact with some kinda blind testing.
It's really a too obvious tone to require blind testing, I mean it can't be
If I'd have to suspect anything first, I'd suspect the speakers/headphones.
I wouldn't know how to analyze this, though.
Plus, some have said not to be hearing it through speakers, but could
> so Didier, i might not have time to fiddle with this, but if i find
> some, may i make some copies of that and switch around the tones.
> there would be 3! permutations where the difference can be seen and
> whether heard is being tested. of, if there is someone with tons of
> time on hand to do that. i think this is epitomizes an application
> of blind testing. we can keep Didier's original as the control and
> call it "ABC". then people have to listen to one of the six
> permutations and say which one it is. looking at the waveforms before
> listening would be cheating. we don't need no double-blind (it
> actually would be that if the "administrator", whomever that is, does
> not know which is which), because if people peek, the experiment is
> compromized anyway.
>> Are you listening through headphones?
> yes. all's i did is let iTunes play it looped. you have it at the
> perfect length, relative to the spacing between tones, there's no
> break in the beat. i listened at various levels. i soon lost count
> as to which one was first.
> r b-j rbj at audioimagination.com
> "Imagination is more important than knowledge."
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