something about ETD's from an insider

[b98tu@t-online.de]

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Andre is the the european distributor of the verituner isn=C2=B4t he ? =
;)

friendly,

Bernhard
  ----- Original Message -----=20
  From: antares=20
  To: Pianotech=20
  Sent: Saturday, January 07, 2006 12:16 AM
  Subject: something about ETD's from an insider




  On 6-jan-2006, at 23:43, b98tu@t-online.de wrote:


    No they don?t and there are good physical reasons why they don?t. =
(You will find not one?tuner at Steinway (at least in Hamburg) who is =
allowed to service concerts with an ETD for example). This has nothing =
to do with traditionalism or ignorance to modern technology.
    Most?modern ETD?s are doing fast fourier transformation (FFT)?for =
pitch calculation.
    Be sure, the he ear has no FFT transformator... There is a big =
difference in what you get measured and what you hear.
    In?some ETD manuals you find sometimes statements of "0.1 Hz =
accuracy"
    This?is true for a signal that would not float in pitch over more =
than?2 or 3 seconds to catch enough samples at the current possible =
samplerates. Piano sounds are a really nonlinear matter that can?float =
in?pitch?up to?some?Hz over?a second, when strucked firm. By =
transforming a signal from the time domain into the frequency domain =
with the desired accuracy (what most?ETD?s do), you loose the =
information when a singal passes exactly what frequency at what time. =
Tuning with an ETD makes it necessary to tune at low volume levels =
(Pitch float is less at low volume levels). A good?aural tuner tune with =
a firm struck,?to catch also the transient phase of the sound at higher =
volumes. Low volume tuning is like not voicing the left pedal, it =
leaves?the transient phase untuned. But sometimes it may happen, that =
the pianist also use volumes above mp...
    ?
    Bernhard Stopper
    ?
    ?
    Qui habet aures audiendi audiat


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  Never the less..........


  After having tuned all the piano's in the world, so to speak, I am =
still mightily happy with my Verituner.
  I have tuned a great number of piano's with the Verituner since about =
2000, and you know what?
  about every tuning I made with the aid of this invention of Dave =
Carpenter turned out to be? the very best tuning I have ever made in my =
whole life, with the acceptance of one tuning which was my final exam =
tuning at Yamaha in Hamamatsu.
  That tuning was just as good as the average Verituner tuning.


  I t was a shocking discovery, let me tell you....




  friendly greetings
  from
  Andr=E9=A0=8Forebeek


  R. Vinkeleskade 1-3hg

  1071 SN Amsterdam?
  The Netherlands


  tel/fax : 0031-20-6237357
  gsm ? :? 0031-645-492389


  www.concertpianoservice.nl





  and the stories I hear!




























































































































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