POSITION TRANSDUCER SYSTEM WITH BUILT-IN CALIBRATOR FOR MOVING OBJECT, METHOD FOR ACCURATELY DETERMINING POSITION OF MOVING OBJECT AND KEYBOARD MUSICAL INSTRUMENT EQUIPPED WITH THE POSITION TRANSDUCER SYSTEM

摘要

A silent automatic player piano calibrates the black/white keys so as to exactly relate a key position signal to the current key positions on the trajectory of the key by itself before a recording so that the key motions are exactly recognized in a recording operation by the silent automatic player piano.