Automatic player piano equipped with soft pedal, automatic playing system and method used therein
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United States of America Patent
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Jun 14, 2011
Grant Date -
Sep 16, 2010
app pub date -
Mar 9, 2010
filing date -
Mar 13, 2009
priority date (Note) -
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status (Latency Note)
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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.
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