Music – Instruments – Automatic
Reexamination Certificate
2006-01-31
2006-01-31
Donels, Jeffrey W (Department: 2837)
Music
Instruments
Automatic
C084S115000, C084S462000
Reexamination Certificate
active
06992241
ABSTRACT:
An automatic player piano has a feedback control loop for each of the black/white keys; the controller firstly determines a reference trajectory, i.e., a target key position varied with time for each key to be moved in the play-back, and calculates a target key velocity, and compares a true key position reported from a key sensor and a true key velocity calculated from the true key position with the target key position and target key velocity for optimizing the duty ratio of the driving signal; the positional difference and the velocity difference are independently multiplied by a positional gain and a velocity gain so as to determine the optimum duty ratio; since the ratio of the velocity gain to the positional gain is 1 to 3, the key travels along the reference trajectory without oscillation and overshoot.
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patent: 5451708 (1995-09-01), Fujiwara et al.
patent: 5652399 (1997-07-01), Fujiwara et al.
patent: 6051762 (2000-04-01), Fujiwara et al.
patent: 2-275991 (1990-11-01), None
patent: 7-175472 (1995-07-01), None
Donels Jeffrey W
Morrison & Foerster / LLP
Yamaha Corporation
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