Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2007-07-03
2007-07-03
Donovan, Lincoln (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S013000, C084S021000, C084S723000
Reexamination Certificate
active
11054412
ABSTRACT:
An automatic player piano is equipped with solenoid-operated pedal actuators for driving the pedals in a playback; since a large quantity of induction is coupled to the solenoid, the driving signal is delayed due to long time constant so that the pedals behave differently from those in the original performance; a controller, which is incorporated in the automatic player, firstly determines a target mean current of the driving signal to be theoretically required for the reproduction of the pedal motion, and a temporary means current twice as much as the target mean current at the maximum; the controller supplies the driving signal at the temporary mean current to the solenoid in an early stage of each cycle, and, thereafter, recovers the driving signal to the target mean current so that the pedal motion becomes close to that in the original performance.
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Fujiwara Yuji
Ishizaki Koichi
Ohba Yasuhiko
Donovan Lincoln
Harness Dickey & Pierce PLC
Russell Christina
Yamaha Corporation
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