Apparatus and method for harmonic-percussive-residual sound separation using a structure tensor on spectrograms

A method for analysing a magnitude spectrogram of an audio signal, comprising:

• determining a change of a frequency for each time-frequency bin of a plurality of time-frequency bins of the magnitude spectrogram of the audio signal depending on the magnitude spectrogram of the audio signal, and
• assigning each time-frequency bin of the plurality of time-frequency bins to a signal component group of two or more signal component groups depending on the change of the frequency determined for said time-frequency bin.

A non-transitory digital storage medium having a computer program stored thereon to perform the method for analysing a magnitude spectrogram of an audio signal, comprising:

• determining a change of a frequency for each time-frequency bin of a plurality of time-frequency bins of the magnitude spectrogram of the audio signal depending on the magnitude spectrogram of the audio signal, and
• assigning each time-frequency bin of the plurality of time-frequency bins to a signal component group of two or more signal component groups depending on the change of the frequency determined for said time-frequency bin,
• when said computer program is run by a computer.