Title:
音楽信号を音符基準表記に変換する方法及び装置、並びに、音楽信号をデータバンクに照会する方法及び装置
Document Type and Number:
Japanese Patent JP3964792
Kind Code:
B2
Abstract:
In a method for transferring a music signal into a note-based description, a frequency-time representation of the music signal is first generated, the frequency-time representation comprising coordinate tuples, a coordinate tuple including a frequency value and a time value, the time value indicating the time of occurrence of the assigned frequency in the music signal. Thereupon, a fit function will be calculated as a function of the time, the course of which is determined by the coordinate tuples of the frequency-time representation. For time-segmenting the frequency-time representation, at least two adjacent extreme values of the fit function will be determined. On the basis of the determined extreme values, a segmenting will be carried out, a segment being limited by two adjacent extreme values of the fit function, the time length of the segments indicating a time length of a note for the segment. For pitch determination, a pitch for the segment using coordinate tuples in the segment will be determined. For calculating the fit function and determining extreme values of the fit function for segmenting, no requirements are made to the music signal which is to be transferred into a note-based representation. The method is thus also suitable for continuous music signals.
Inventors:
Clefents, Frank
Brandenburg, Karl Heinz
Kaofman, Matthias
Brandenburg, Karl Heinz
Kaofman, Matthias
Application Number:
JP2002581512A
Publication Date:
August 22, 2007
Filing Date:
April 04, 2002
Export Citation:
Assignee:
Fraunhofer-Gesellschaft Tool Felderung del Angewanten Forsung Eingetler Genel Fehlein
International Classes:
G10G3/04; G10H1/00
Domestic Patent References:
| JP1219888A | ||||
| JP2000267671A | ||||
| JP1219626A | ||||
| JP11259066A | ||||
| JP7287571A | ||||
| JP2000155759A | ||||
| JP6274157A | ||||
| JP5181464A | ||||
| JP4261592A |
Other References:
齋藤 直樹、中井 満、下平 博、嵯峨山 茂樹,隠れマルコフモデルによる音楽演奏からの音符列の推定,情報処理学会研究報告 Vol.99 No.106 99-MUS-33,日本,社団法人情報処理学会,1999年12月12日,27~32頁
Attorney, Agent or Firm:
Takeichi Morishita