para-inharmonicity and tuning curves

[Jim Coleman, Sr.]

Hi Bob:

I'm glad you cleared that up. I knew that the RCT measures both ways.
Does TuneLab measure both ways also?

Jim Coleman, Sr.

On Thu, 20 May 1999, Robert Scott wrote:

> Jim Coleman, Sr. wrote:
> 
> >In anticipation of your next question, when you plot for, 3rd, 5th,
> >6th, and 7th partials, you must make a correction for equal temperament
> >being the source of the readings. Here are the readings taken with
> >an electronic tuning machine:
> >
> >3rd partial   5th partial   6th partial   7th partial
> >
> >5.9          -4.6           13.6         -15.4
> >
> >Now if you plot these numbers on the same graph, they will be all over 
> >the place. They must be adjusted in relation to harmonic partials
> >instead of equal temperament readings. From the 3rd partial subtract
> >1.95, from the 5th partial add 13.687, from the 6th partial subtract
> >1.95 (same as 3rd partial), from the 7th partial, add 31.?? 
> 
>   Let's be clear on one thing.  The only reason that these "odd-ball"
> partials require special handling when measuring inharmonicity is
> that you are using the SAT.  Other tuning devices (RCT and TuneLab)
> measure inharmonicity directly and not by switching to an
> equal-tempered note that is close to the desired partial.  For
> these electronic tuning machines, no special adjustment is
> necessary to compensate for equal temperament being the source
> of the readings because it is not.
> 
> -Bob Scott
>  Ann Arbor, Michigan
> 
>