Re: [Tuning] acoustic piano "latency"

Aug. 2006 PTJ turned up. The test was conducted with two
piano players at the Leningrad Piano Factory in the early
1970s. One identified close up recordings of his own touch
effects better than chance but not for a microphone placed
10m away, and the other was ignored because they claimed to
influence the pitch of the notes. The authors present
Askenfelt and Jansson's experimental results driving a
Steinway bass hammer at the roller (illustrated with the
flange held rigidly), the lowest frequency for "swell mode"
(cantilever) is 50-60hz, and for two "ripple modes"
(reflected) 200-400 hz, and 600hz, and propose these might
influence the string either by changing the striking angle,
which Galembo calculated not to be more than 0.3mm and so
only important in the extreme treble, or by rubbing against
the string, which A. and J. didn't observe, but concede that
it has been observed that some shanks with bad grain
orientation make the tone worse. They show scaled graphs of
measured key and hammer velocities for legato and staccato
touch, the staccato ones show hammers decelerating almost
halfway before striking the strings, and alterating positive
and negative key velocities explained as vibrations in the
key, and show that there is much less correlation in staccato
playing between the motions of the hammer and of the key which
the the player controls and feels.

--- In metatuning@yahoogroups.com, "threesixesinarow" <music.conx@...>
wrote:
>
> Aug. 2006 PTJ turned up. The test was conducted with two
> piano players at the Leningrad Piano Factory in the early
> 1970s. One identified close up recordings of his own touch
> effects better than chance but not for a microphone placed
> 10m away, and the other was ignored because they claimed to
> influence the pitch of the notes. The authors present
> Askenfelt and Jansson's experimental results driving a
> Steinway bass hammer at the roller (illustrated with the
> flange held rigidly), the lowest frequency for "swell mode"
> (cantilever) is 50-60hz, and for two "ripple modes"
> (reflected) 200-400 hz, and 600hz, and propose these might
> influence the string either by changing the striking angle,
> which Galembo calculated not to be more than 0.3mm and so
> only important in the extreme treble, or by rubbing against
> the string, which A. and J. didn't observe, but concede that
> it has been observed that some shanks with bad grain
> orientation make the tone worse. They show scaled graphs of
> measured key and hammer velocities for legato and staccato
> touch, the staccato ones show hammers decelerating almost
> halfway before striking the strings, and alterating positive
> and negative key velocities explained as vibrations in the
> key, and show that there is much less correlation in staccato
> playing between the motions of the hammer and of the key which
> the the player controls and feels.

Did you mean to post this to Tuning?

-Carl

--- In metatuning@yahoogroups.com, "Carl Lumma" <clumma@...> wrote:
>
> --- In metatuning@yahoogroups.com, "threesixesinarow" <music.conx@>
> wrote:
> >
> > Aug. 2006 PTJ turned up. The test was conducted with two
> > piano players at the Leningrad Piano Factory in the early
> > 1970s...
>
> Did you mean to post this to Tuning?
>
> -Carl
>

It was a tossup. By the way, you saw this one before,
http://hammerfluegel.net/viewer.php?albid=308&stage=3&imgid=1623

> By the way, you saw this one before,
> http://hammerfluegel.net/viewer.php?albid=308&stage=3&imgid=1623

Indeed so.

-Carl

or else é? but he shows a kind of different action than
what's used now.

Matthay, Tobias. The first principles of pianoforte playing:
being an extract from the author's "The act of touch,"
designed for school use and including two new chapters,
Directions for learners and Advice to teachers. London:
Longmans, Green

http://www.archive.org/details/firstprincipleso00mattuoft