872425.fig.004a
(a)
872425.fig.004b
(b)
872425.fig.004c
(c)
872425.fig.004d
(d)
872425.fig.004e
(e)
Figure 4: Spectrogram of piano signal, (a) original unmixed, (b) SNTF, (c) refiltered SNTF, (d) SSNTF, (e) source-filter SSNTF.