Patent ID: 6969791

Claim:
An automatic player keyboard musical instrument for producing tones, comprising: a keyboard musical instrument including a tone generating sub-system for producing said tones, and plural motion propagating paths each having plural component parts connected in series toward said tone generating sub-system and sequentially moved for specifying a pitch of the tone to be produced; an automatic playing system showing an individuality together with said plural motion propagating paths and including plural actuators respectively associated with said plural motion propagating paths and selectively energized with driving signals so as selectively to cause the associated motion propagating paths to move, plural sensors remote from said plural actuators and respectively converting a motion of predetermined component parts of said plural motion propagating paths to detecting signals representative of a current physical quantity expressing said motion, and plural feedback control loops connected between said plural sensors and said plural actuators, normalizing said current physical quantity so as to eliminate said individuality from said current physical quantity for determining a true physical quantity and optimizing said driving signals on the basis of said true physical quantity for controlling the motion of said predetermined component parts; and a recording system sharing said plural sensors with said automatic playing system, and analyzing said current physical quantity for producing pieces of music data representative of a performance on said keyboard musical instrument.