Method for analyzing musical compositions

A method of determining on a computer-based system at least one representative segment of a musical composition, the method comprising:

• acquiring a digital audio signal representing said musical composition;
• dividing said digital audio signal into a plurality of frames of equal frame duration Lf,
• calculating at least one audio feature value for each frame by calculating the Root Mean Squared, RMS, audio energy envelope or the whole length of said digital audio signal and quantizing said RMS audio energy envelope into consecutive segments of constant audio energy levels;
• selecting the first frame of the at least one segment associated with the highest energy level as a representative frame;
• and
• determining at least one representative segment of the digital audio signal with a predefined segment duration Ls, the starting point of said at least one representative segment being a representative frame.

A method of determining on a computer-based system at least one representative segment of a musical composition, the method comprising:

• acquiring a digital audio signal representing said musical composition,
• dividing said digital audio signal into a plurality of frames of equal frame duration Lf,
• calculating at least one audio feature value for each frame by calculating a Mel Frequency Cepstral Coefficient, MFCC, vector for each frame and calculating the Euclidean distances between adjacent MFCC vectors;
• identifying at least one representative frame corresponding to a maximum value of said calculated Euclidean distances between adjacent MFCC vectors;
• and
• determining at least one representative segment of the digital audio signal with a predefined segment duration Ls, the starting point of said at least one representative segment being a representative frame.

A method of determining on a computer-based system representative segments of a musical composition, the method comprising:

• acquiring a digital audio signal representing a musical composition,
• dividing aid digital audio signal into a plurality of frames of equal frame duration Lf,
• calculating at least one master audio feature value and at least one secondary audio feature value for each frame by analyzing the digital audio signal, said master audio feature value and said at least one secondary audio feature value each being a numerical representation of a different musical characteristic of said digital audio signal with a numerical value equal to or higher than zero,
• identifying a master frame corresponding to a representative master audio feature value, identifying at least one secondary frame corresponding to a representative secondary audio feature value,
• determining a master segment of the digital audio signal with a predefined segment duration Lms, the starting point of said master segment being a master frame, and
• determining at least one secondary segment of the digital audio signal with a predefined segment duration Lss, the starting point of each secondary segment being a secondary frame.