Title: High-fidelity automatic player musical instrument, automatic player used therein and method employed therein
Application Number: 200510091051 Application Date: 2005.08.04
Publication Number: 1746968 Publication Date: 2006.03.15
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G10F1/02;G10H1/00
Applicant(s) Name: Yamaha Corp. Address:
Inventor(s) Name: Sasaki Tomoya
Attorney & Agent: di wankui huang xiaolin
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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