[music-dsp] Fw: A little question about DSP performance

[Didier Dambrin]

> 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 
made up.

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 
through headphones.



> 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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