Chord estimation apparatus and method

A method of estimating a chord, comprising the steps of:

• extracting a frequency component from an input music signal;
• mapping the frequency component extracted by the step of extracting a frequency component onto each tone and generating scale-component information including each tone and loudness thereof;
• folding the scale-component information generated by the step of generating scale-component information for each two octaves to generate scale-component information including 24 tones;
• and
• inputting the scale-component information including the 24 tones into a Bayesian network in order to estimate a chord.

A chord estimation apparatus comprising:

• a frequency-component extraction mechanism for extracting a frequency component from an input music signal;
• a scale-component information generation mechanism for mapping the frequency component extracted by the frequency-component extraction mechanism onto each tone and generating scale-component information including each tone and loudness thereof;
• a folding mechanism for folding the scale-component information generated by the scale-component information generation mechanism for each two octaves to generate scale-component information including 24 tones;
• and
• a chord estimation mechanism for inputting the scale-component information including the 24 tones into a Bayesian network in order to estimate a chord.