From: A semisoft thresholding method based on Teager energy operation on wavelet packet coefficients for enhancing noisy speech
SNR (dB)
Universal threshold
WPF algorithm
WTHSKL method
Proposed method
15
1.2
1.3
2.7
3.1
10
3.2
4.5
5
5.1
4.99
7.89
0
6.12
5.97
6.92
9.38
-5
8
7.76
8.86
11.9
-10
9.5
9.78
10.94
12.5
-15
11.51
10.98
11.1
13.37