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Greetings Oleg,<br>
Would it be possible to obtain this paper in English, I have some
problems with my High school French and over 35years of
forgetfullness.<br>
<br>
<br>
<blockquote type=cite cite>What they try to check anywway was the fact
(theory) that a tuner doe's <br>
not tune the three (yes they test 3 strings) unissons (fondamental) with
<br>
the same pitch, and why. Twoo strings are coupling in phase opposition
<br>
after a few seconds, so their fondamental are in tune so what do we do
<br>
of the third string ? <br>
</blockquote><br>
This test would only be valid if the harmonic spectrum was checked at
precise dynamic levels on all three strings, a year ago I would have
agreed with this hypothisis, but now I'm not so sure. If you use your RCT
to first ensure the harmonic spectrum is even with a reproducable test
blow, and then tune each string to obtain full bloom on each string then
the error is less than 0.1c. I doubt very much that you would hear any
out of tuneness.<br>
<br>
<blockquote type=cite cite>I too strongly suspect spectral differences
because of the hammers, <br>
strings, V-bar and so on. <br>
I totally agree with the partias change corellated with the hammer <br>
elasticity. A few weeks I tuned a piano (D S&S) for students
recording a <br>
CD in a conservatory. This D had been voiced without shaping of the
<br>
hammers, these are lively but with large grooves. </blockquote><br>
The elasticity in the centre string area of the hammer is critical to
even unison voicing, and consistent unicorda tone quality.<br>
<br>
<br>
<br>
<blockquote type=cite cite>I was obliged to come back because they had
big thump noises when using <br>
the left pedal, due to the grooves of course. <br>
In a hurry, I shape (!) the hammers quickly, voice a little, an then I
<br>
was obliged to tune again all the 5th octave and up to treble, with much
<br>
less strech, because of the change in sound wich did not allow the large
<br>
strech used before. I've done that aurally in 20' and all of that was
<br>
very natural to my ears. Did not have the time to check with RCT (but
<br>
this piano is very stable). </blockquote><br>
If you had reshaped octave's 5,6,&7, you would have noticed a further
drop in stretch.<br>
<br>
If your researchers are only using a Conn Stroboconn to do these
measurements, then appying theory of errors, this could explain why they
are talking about 0.5 to 1.0c errors on one unison which seems wide to
me.<br>
<br>
Regulation is a big factor in these measurements, particularly jack
height and escapement. In my experiments I have found that ANY lost
motion between the jack and the knuckle (roller) makes reproducability
next to impossible.<br>
<br>
I would be interested in sharing imformation with these people.<br>
<br>
Regards Roger<br>
<br>
<br>
<div>Roger Jolly</div>
<div>Baldwin Yamaha Piano Centre</div>
<div>Saskatoon and Regina</div>
<div>Saskatchewan, Canada.</div>
<div>306-665-0213</div>
Fax 652-0505
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