back check, a magical mystery tour.

[Isaac OLEG]

I mean, there are more than one mode of play for the piano. If a
bacheck position add strength to a larger window of force between
piano and forte, no doubt it is very perceptible.

I agree that the synchronism may be different when playing softly and
playing at the edge of saturation, but if the brake induced by the
internal friction is coherent and consistent vs. the flexibility of
the ensemble a possibility exist that the response of the system
remain similar for a larger dynamic zone.

May be clear as mud certainly

Isaac OLEG



-----Message d'origine-----
De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de Richard Brekne
Envoyé : mardi 17 août 2004 20:32
À : Pianotech
Objet : Re: back check, a magical mystery tour.


Good you brought Askenfelt into this Ed.  The first thing that
bothered
me about Bernhards post was the synchronization bit at all levels of
play... but when you first mention the Five lectures... of course....
no
way these can be in sync at all to begin with..  Still.... ya gota
admit
he had a seductive explanation there.... :)

Cheers
RicB

A440A@aol.com wrote:

>Bernard writes:
>
><< the energy of the hammer returned to the backcheck and the energy
of the
>key to the keyframe become synchronous with the said 2 milimeters. If
this two
>blows are synchronized, there is a higher pulse wave running through
the
>instrument giving more additional energy to the string than when this
two blows are
>time offset (and may cause phase losses when reaching the string).<<
>
> Greetings,
>   According to Anders Askenfelt, the timing of these two events is
dependant
>on the force of the blow, so their synchronization is variable.  In
the
>publication "Five Lectures", (
http://www.speech.kth.se/music/5_lectures/ )  it is
>pretty clear that the hammer will return to the back check well after
the key
>has hit the bottom of its stroke on all but the softest blows.  The
stronger the
>blow, the earlier the key bottoms in relation to everything else.
>   There are transient pulses that do travel back and forth through
the
>action as the hammer goes through its arc, but without contacting
anything, the
>backcheck seems to be isolated until after escapement.  I am not
convinced that
>the distance from the tail of the hammer is as important as the
interfacing
>angle of tail to backcheck surface. There is certainly a feeling of
contact when
>the tail is grabbed suddenly by an acutely angled backcheck as
opposed to the
>longer path the tail makes when contacting a more parallel surface of
the
>backcheck. This seems to be no greater than the differences that can
be felt with
>different hardness of key end felt under the damper levers, though.
>Regards,
>
>Ed Foote RPT
>http://www.uk-piano.org/edfoote/index.html
>www.uk-piano.org/edfoote/well_tempered_piano.html
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>
>

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