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EURASIP Journal on Audio, Speech, and Music Processing
Figure 1 | EURASIP Journal on Audio, Speech, and Music Processing

Figure 1

From: Percussive/harmonic sound separation by non-negative matrix factorization with smoothness/sparseness constraints

Figure 1

Magnitude spectrogram of an approximately 6-s-long excerpt of monaural mixture signal composed of percussive and harmonic sounds. The percussive sounds form vertical lines because of their smoothness in frequency and sparseness in time; the harmonic sounds form horizontal lines because of their sparseness in frequency and smoothness in time; the grey level represents the energy of each frequency.

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