Patent ID: 6664458
Filing Date: 2003-12-16
Classification: G09B,G10H

Abstract:
An apparatus for determining musical notational symbols based on musical composition data, comprising:a music composition data storing device which stores music composition data representing a length of music containing a progression of notes; a music data readout device which reads out said music composition data; a first selecting device which counts the number of notes which are intrinsic to each of a predetermined plurality of tonalities among the notes contained in a selected span of said length of music, and selects a single optimum tonality or plural tonality candidates based on the counted number of intrinsic notes with respect to each tonality according to a first selection rule; a second selecting device which extracts notes to be subjected to judgment from among a top sub-span of said selected span, examine whether there is a single tonality whose tonic chord includes all of said extracted subject notes among said plural tonality candidates, and, if and only if there is, selects said single tonality to be an optimum tonality; a third selecting device which selects a tonality having a least number of accidental signs among said plural tonality candidates to be an optimum tonality; and a key signature determining device which determines a key signature for said optimum tonality selected by any one of said first, second and third selecting devices.