[CAUT] coupled motion and other myths

[Andrew Anderson]

I've observed the same thing with my VT100.  Some pianos require as 
much as 1/2 cent sharp to end on pitch when you add unisons.  Some 
pianos don't go through a measure-able drop.  Now the VT is measuring 
a number of partials at once to calculate note placement so that may 
be why it shows up more readily with it.

Andrew Anderson

At 09:21 AM 6/14/2007, you wrote:
>I would love a project that would result in a bringing together of 
>the words we so loosely toss around and the concepts or postulates 
>as I would call them. Hopefully after trying to define some of the 
>concepts they become theorums that we can use to carry on decent discussions.
>
>One another note. I was at the convention where Virgil Smith was 
>going to show the difference between one string and the drop in 
>pitch when adding the second string. Dr Sanderson was there to 
>measure the difference and somehow I was lucky enough to be sittting 
>right next to him.
>
>So Virgil played the checks that aurally, everyone in the room could 
>hear the difference. Then Dr Sanderson tried to measure it and there 
>was no difference. He changed the note he was reading, moving up the 
>partial chain and low and behold the note was flatter at the the 4th 
>partial. At least I think it was the 4th, may be the 3rd. Certainly 
>some ETDs will not focus on the proper partial so the operater has 
>to override.
>
>The change in the partial structure will certainly make a tuner 
>alter his tuning and I think that is the point Virgil was trying to make.
>
>Keith Roberts
>
>
>On 6/13/07, Richard Moody 
><<mailto:remoody at midstatesd.net>remoody at midstatesd.net> wrote:
>
>I am thinking about a research project hopefully resulting in an 
>article, to get interaction from piano technicians about  such 
>concepts as, "coupled motion"  "para inharmonicity", "longitudinal 
>vibration" (did you really understand that article in PTJ?), 
>"reverse well", "well temperament", and why the 3 string unison is 
>flat from the first string tuned. I forget what they call that but I 
>have a tuning machine that shows it isn't true.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20070614/e00b12a8/attachment.html