Automatic player piano equipped with soft pedal, automatic playing system and method used therein
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 14, 2011
Grant Date -
Sep 16, 2010
app pub date -
Mar 9, 2010
filing date -
Mar 13, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An upright piano is equipped with a soft pedal, and a player makes the hammer stroke shorter by depressing the soft pedal; while a user is reproducing a music tune by means of an automatic player piano fabricated on the basis of the upright piano, the keys are servo controlled on the basis of a position difference of keys between target values and actual values and a key velocity difference, and the duty ratio of driving signal, which is supplied to solenoid-operated key actuators for the keys, are determined on the basis of multiplications between the position difference/key velocity difference and a position gain and a velocity gain; the value of position gain is reduced on the condition that the soft pedal is depressed for preventing the playback from an unintentional loud tone or tones.
First Claim
Other Claims data not available
