Música e Autômato: uma receita de nomeação de acordes

Abstract

The naming chords problem consists in determine the chords sequence of musical notes. There are rules that define what are the notes that form or not chords. A complication arises due the notes that have the same frequency, but different names. This paper aims approach this problem with Automata Theory. Therefore, we propose develop an automata who recognizes the chords (triads and sevenths) of a song taken from a file in format MIDI (Music Instrument Digital Interface), from the automata, implement a Java Desktop system that uses him as routine to display to the user the sequence of chords. The proposed automata, receives as input a sequence of notes taken from a MIDI file and returns as output a sequence of chords, considering the problem of the names of the notes. The system will call QMusic, and it uses the Java Sound API and JMusic to facilitate manipulation of MIDI files. It also allows, multiple forms of visualizations, ranging from the ABC notation to the complete notation of the chord, showing its structure, namely: Tonic or Root, Third, Fifth and if Tetrad, Seventh.