Copyright © 2016
by Full-Measure Response, Inc.
All Rights reserved
Enabling your customers to experience the ultimate in keyboard continuity
Measure While MovingTM technology
One of the essential features of the KeyForce 1 system is the machine's
ability to accurately move, while simultaneously measuring and recording
resulting reaction forces. It's the so-called finger of the KF1 that moves in a
consistent, predetermined fashion. It is the forces acting against this finger
that are actually measured. They are not only measured, but measured in a
continuous manner...once every millisecond! Below is a view of the KF1's
finger in contact against a piano key.
It's not very helpful for the KF1's finger to move against - or near - the key
if the movement is not exactly and totally controlled. There are several func-
tionalities associated with the KeyForce 1 technology, each one requiring one
or more types of movement. Each of these movement types is known as a
routine, and most routines worthy of discussing here occur simultaneous with
continuous force measurement. No matter the routine, the finger's posi-
tion must be known at every instant of time.
For a given routine, the exact nature of the finger's movement is determined
by a unique Motion Profile. This is simply of relationship (graph) between
finger position and time. The position is always with respect to a "zero point".
For some routines, such as those dealing with key leveling/dipping, that zero
point corresponds to a horizontal plane - just clearing the highest key - at some
known height above the keybed or bench. For other routines, the zero point
corresponds to a previously determined "at rest" position of the keytop. The
two graphs below are Motion Profiles for two different KF1 routines.
The first one produces constant downward finger speed, after a brief accelera-
tion period. This is the type of profile used in the L
et-off event and A
part of our FLA
product. The resulting forces are instantaneous Down Forces.
Since the downstroke goes all the way to dip, all kinds of valuable force and
timing information is obtained, regarding each note's let-off event. Please visit
the FLA Product area, under "the Products", for more information. The second
profile is similar but has the downstroke followed by a brief pause, and then a
constant-speed upstroke. Forces measured during the downward part of this
profile are instantaneous Down Forces. Forces measured during the upstroke
are the instantaneous Up Forces. Please see the Let-Off event and Aftertouch
section of the FLA Product
area for more detailed information.