Re: Make my horn not quite so bright sounding ?

"Double blind" refers to test administrator (proctor) and the "tester"
(trumpet player) not knowing which configuration is in use. The player
identifies how the horn responds, focusing on the slotting as either
"unchanged", "looser" or "tighter". In this case, double blind will be hard
to achieve because the proctor will necessarily know what cap configuration
he or she has put on the trumpet when the trumpet is handed to the
blindfolded tester. To pull it off as a true double blind there'll probably
need to be a third person involved in changing the configuration so that the
proctor doesn't know the result. The configuration will be identified only
as "A", "B", "C", "D", "E".

As I said in an earlier post, the main difference is in the response of the
trumpet to the tester, not the sound to an audience. The tester needs to be
"expert" and familiar with the test horn. Average players may or may not
detect differences, but I believe that expert trumpeters will identify the
differences with high correlation.

Subjective double blind testing can be extremely difficult to pull off. I've
been party to listening comparisons where there was absolutley know
correlation for 4 out of 5 listeners while 1 listener correlated (correctly
identified the characteristic under test). I think this experience
demonstrates that some listeners are considerably more "expert" than average
listeners. Others argue that the test showed no statistical significance
because four out of five couldn't make any relevent observations. I believe
listening panels need to include "expert" listeners. Just because we all
have ears doesn't make us all observant and sensitive listeners. It's no
different from picking five people out of an audience to shoot 20-foot
jumpshots. If one of the five happens to be an NBA player he might achieve a
70% success rate (might) while the other four might be lucky to achieve a
20% success rate, with luck. Aptitude AND training account for a difference.

Prof. T. Moore at Rowlins College in FL is doing a lot of excellent study of
trumpet performance physics parameters. As published in a recent ITG Journal
he disproved his own hypothosis that bell material (mass) didn't matter and
that bell shape was the determinent of trumpet sound. Rather than double
blind, he measured frequency spectrum while changing only mass and using a
set of artificial lips to sound the reference tone. That experiment took
months to set up and perform and Moores studies continue and trying to
identify the "why" of the results.

Hmm, that reminds me, Moore successfully demonstrated some of the impacts of
changing trumpet resistance. I wonder if his equipment is sensitive enough
to measure the change that occurs by adding mass at the third cylinder. I
suspect that's what's going on here and we're feeling it as tighter or
looser slotting. Anyone know Prof. Moore?

Dave

"Greg Evans" <gregIGNOREevans@xxxxxxxxxxxxxxxxxxx> wrote in message
news:3pu4adFbn9fjU1@xxxxxxxxxxxxxxxxx
> St. John Smythe wrote:
>
>> In a proper double-blind study, neither the player nor the person who
>> hands him the trumpet(s) knows whether the heavy caps are in place.
>
> Wouldn't a "double-blind" study in this case refer to (1) the player, and
> (2) a listener who rates tonal changes, if any? As long as neither of
> them
> could see what the hander-of-trumpet(s) gives the player? Or would that
> more properly be a triple-blind experiment?
>
>


.

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