Patent ID: 7250567
Filing Date: 2007-07-31
Classification: G10H

Abstract:
1. An automatic musical composition classification device that automatically classifies a plurality of musical compositions, comprising: a chord progression data storage part that saves chord progression pattern data representing a chord progression sequence for each of the plurality of musical compositions; a characteristic amount extraction part that extracts chord-progression variation characteristic amounts for each of the plurality of musical compositions in accordance with the chord progression pattern data; and a cluster creation part that groups the plurality of musical compositions in accordance with the chord progression sequence represented by the chord progression pattern data of each of the plurality of musical compositions and with the chord-progression variation characteristic amounts, wherein the characteristic amount extraction part comprises: a chord histogram processor that calculates, as each of histogram values, a total of durations of each of chords that exist in the musical composition in accordance with the chord progression pattern data for each of the plurality of musical compositions; a histogram deviation processor that calculates the histogram deviation in accordance with the histogram values of the respective chords for each of the plurality of musical compositions; and a chord variation rate processor that calculates the chord variation rate in accordance with the chord progression pattern data for each of the plurality of musical compositions; and wherein the histogram deviation and the chord variation rate of each of the plurality of musical compositions are the variation characteristic amounts.