Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2007-12-11
2007-12-11
Fletcher, Marlon (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S723000, C084S743000, C084S744000
Reexamination Certificate
active
11218116
ABSTRACT:
An automatic player piano includes key sensors, solenoid-operated key actuators and a controller, which form a servo-control loop, and the key motion is reproduced under the control of the servo-control loop; the servo-control loop adjusts the driving pulse signal to a target duty ratio or mean current so as to force the black and white keys to travel on reference key trajectories; the controller categorizes the key motion in half-stroke or full-stroke, and determines the target duty ratio on the basis of a deviation between the target key position and the actual key position, a deviation between the target key velocity and the actual key velocity and the sort of key motion so as to make the key motion stable.
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patent: 9-81125 (1997-03-01), None
Fletcher Marlon
Harness Dickey & Pierce PLC
Yamaha Corporation
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