Musical instrument, music data producer incorporated therein and method for exactly discriminating hammer motion

A music data producer comprising:

• plural sensors monitoring component parts of a musical instrument actuated for specifying tones to be produced, and producing signals representative of plural series of pieces of motion data expressing motion of the associated component parts on respective trajectories;
• and
• a data processing unit connected to said plural sensors and having
• an analyzer analyzing said plural series of pieces of motion data so as to determine current values indicative of unique points on said trajectories,
• a judge determining whether or not said component parts reach said unique point at previous values, and
• a rectifier determining true values expressing said unique points on the basis of said current values when said judge makes the negative decision and storing said true values as said previous values in a memory.

A method for rectifying a value indicative of a unique point on a trajectory of a component part incorporated in a musical instrument, comprising the steps of:

• a) accumulating pieces of motion data expressing motion of said component part;
• b) finding a unique point on said trajectory;
• c) determining a current value indicative of said unique point;
• d) judging whether or not said unique point is expressed by a previous value;
• e) determining a true value indicative of said unique point on the basis of said current value when the answer at step d) is given negative;
• f) storing said true value as said previous value;
• and
• g) repeating said steps a) to d) when the answer at step d) is given affirmative.