Skip to main content
Figure 9 | SpringerPlus

Figure 9

From: On pre-image iterations for speech enhancement

Figure 9

Spectrograms after enhancement by pre-image iterations (a) without regularization plotted with low frequency resolution, (b) without regularization plotted with high frequency resolution, (c) with regularization plotted with low frequency resolution and (d) with regularization plotted with high frequency resolution. Note that there is still a harmonic artifact in (b), however, its magnitude is lower than in the case of kernel PCA and hence it cannot be perceived. With regularization there is more remaining noise than without but this can as well not be perceived. Furthermore the harmonic artifact is masked by this residual noise, as can be seen in (d).

Back to article page