Patent ID: 7390956
Filing Date: 2008-06-24
Classification: G10F

Abstract:
1. A musical instrument for producing tones, comprising: an acoustic musical instrument including plural manipulators respectively assigned pitch names and selectively moved for designating the pitch names of the tones to be produced, and plural tone generating units connected to said plural manipulators and producing said tones designated by means of the moved manipulators; and an electronic system including plural actuators respectively provided for said plural manipulators and selectively activated with a driving signal so as to give rise to motion of said plural manipulators, plural sensors measuring a physical quantity expressing said motion of said plural manipulators and producing detecting signals representative of measured values of said physical quantity, a preliminary processing section supplied with pieces of music data, and determining reference trajectories on the basis of said pieces of music data for the manipulators to be moved, and a motion controlling section connected to said preliminary processing section for receiving pieces of control data representative of said reference trajectories, said plural sensors for receiving said detecting signals and said plural actuators for supplying said driving signal thereto, and varying a magnitude of said driving signal so as to accelerate and decelerate said manipulators, if necessary, thereby forcing said manipulators to move on said reference trajectories, in which said motion controlling section determines the latest estimated value of said physical quantity by calculating a sum of products between said measured values of said physical quantity and weighting factors for each of said manipulators moved on said reference trajectories, and in which said motion controlling section compares said latest estimated value with a corresponding target value on the reference trajectory for said each of said manipulators to see whether or not said driving signal is to be varied in magnitude.