ETD question re: unisons

[D.Martens]

Hi, Carl wrote :

>aAnybody care to render n opinion?<

I don't have an opinion on this, but I do have some observations made with
diffirent ETD's:

I don't trust the ETD's for 100%.
I haved noticed That the Pt100 responds sometimes diffrent to a
"pitchchange"  than RCT on my computer.
So, perhaps it's wise to be cautious with any readings on the subject.
Perhaps it's a good thing to use two diffrent ETD's at the same time to
measure this phenomena ?

I don't know what exactly is causing this to happen.
Perhaps diffirent capacitors in the various ETD's electronic circuits ?

I wonder if this socalled DSP-circuitry would be more reliable in any way.
 I understand this is supposedly one of the advantages of the verituner )

Duncan

>>This is easily understood by comparing a capacitor in an
>electronic circuit, discharging into two different resistive loads.
>In the case of the piano, the two different loads are not switched
>abruptly,
>but gradually.One statement I read was that good pianos don't have
>horizontal vibrations.Really?
>I guess that if the strings were perfectly leveled, the hammer >perfectly
mated to the strings, then the horizontal vibration would be >minimized or
maybe delayed.Now my question would be.  If that >were true would the shape
or point of shift in the amplitude plot be >delayed?
-----Original Message-----
From: Meyer Carl <cmpiano@home.com>
To: pianotech@ptg.org <pianotech@ptg.org>
Date: Friday, February 16, 2001 4:42 AM
Subject: Re: ETD question re: unisons


>Hello Mr. Curious:  I am curious2.
>
>Yes, I read that  and think that he really has a handle on the reason for
>prompt sound and aftersound.
>
>I had a loose leaf notebook with a Xerox of that article along with
articles
>by Jim Ellis, a couple of guys from Baldwin, both from the journal, and a
>comment from Ed McMurrow about horizontal vibration of strings from his
book
>"The educated Piano".  I must have loaned it out since I can't seem to find
>it.
>
>As I understand it, a string will vibrate vertically (grand piano) and the
>impedance of the bridge will be low, hence dissipating energy at a fast
>rate.  Then due to imperfections the strings vibrations will slowly change
>to elliptical and then progress to horizontal.  At the horizontal mode the
>impedance of the bridge will be much higher resulting in a slower rate of
>dissipation.  This is easily understood by comparing a capacitor in an
>electronic circuit, discharging into two different resistive loads.
>
>In the case of the piano, the two different loads are not switched
abruptly,
>but gradually.
>
>One statement I read was that good pianos don't have horizontal vibrations.
>Really?
>I guess that if the strings were perfectly leveled, the hammer perfectly
>mated to the strings, then the horizontal vibration would be minimized or
>maybe delayed.
>
>Now my question would be.  If that were true would the shape or point of
>shift in the amplitude plot be delayed?  That would be an interesting
>question to test with a set up to plot the timing of the transition from
>prompt sound to aftersound with different string levels etc.
>
>aAnybody care to render n opinion?
>
>Carl Meyer
>
>
>----- Original Message -----
>From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
>To: <pianotech@ptg.org>
>Sent: Thursday, February 15, 2001 9:04 AM
>Subject: Re: ETD question re: unisons
>
>
>> I am curious.... just how many of you have read Gabriel Weinreichs paper
>"The
>> coupled motion of piano strings" ?
>>
>>
>> --
>> Richard Brekne
>> RPT, N.P.T.F.
>> Bergen, Norway
>> mailto:Richard.Brekne@grieg.uib.no
>>
>>
>>
>
>