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Various signals: Clean, Noisy and Filtered for 6 different base signals.

The numbers next to the Filtered Signals represent the CORRELATION with the respective Clean Signals.

sentence-female-1
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9913 n0H 0.9313 n1L 0.9886 n1H 0.8492 n2L 0.9874 n2H 0.8058
Weiner Filtered n0L 0.9907 n0H 0.9622 n1L 0.9920 n1H 0.9172 n2L 0.9909 n2H 0.8718

sentence-female-2
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9914 n0H 0.9451 n1L 0.9895 n1H 0.8929 n2L 0.9885 n2H 0.8556
Weiner Filtered n0L 0.9940 n0H 0.9652 n1L 0.9920 n1H 0.9098 n2L 0.9918 n2H 0.8874

sentence-female-3
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9636 n0H 0.8976 n1L 0.9815 n1H 0.8036 n2L 0.9785 n2H 0.7314
Weiner Filtered n0L 0.9846 n0H 0.9458 n1L 0.9859 n1H 0.8724 n2L 0.9829 n2H 0.7986

sentence-male-1
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9759 n0H 0.8598 n1L 0.9693 n1H 0.6494 n2L 0.9669 n2H 0.6085
Weiner Filtered n0L 0.9724 n0H 0.9144 n1L 0.9725 n1H 0.7108 n2L 0.9707 n2H 0.6769

sentence-male-2
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9769 n0H 0.8510 n1L 0.9677 n1H 0.6033 n2L 0.9652 n2H 0.5770
Weiner Filtered n0L 0.9709 n0H 0.9315 n1L 0.9707 n1H 0.6723 n2L 0.9715 n2H 0.6660

sentence-male-3
Noise-added signal n0L n0H n1L n1H n2L n2H
Spectral Subtraction Filtered n0L 0.9744 n0H 0.8342 n1L 0.9647 n1H 0.6365 n2L 0.9672 n2H 0.5932
Weiner Filtered n0L 0.9732 n0H 0.8582 n1L 0.9704 n1H 0.6706 n2L 0.9711 n2H 0.6589

From the correlation values it can be seen that generally Wiener filtering performs better than Spectral subtraction.

While listening to the spectral subtraction filtered signals, almost all of them had one undesired effect that wasn�t as prevalent in the Wiener filtered signals. In the spectral subtraction filtered signals, even when the noise was removed relatively well (judged based on the correlation numbers), there was always an unwanted �hissing� present.