Research Article
Subband DCT and EMD Based Hybrid Soft Thresholding for Speech Enhancement
Table 1
Comparison of the SNR, AvgSegSNR, and PESQ improvements of different denoising methods for a high range of SNR values (white noise).
| A | Input SNR (dB) | Output SNR (dB) | WP [3] | DCT [11] | Soft DCT [4] | () |
| 0 | 4.86 | 6.44 | 6.42 | 7.91 | 5 | 8.92 | 10.03 | 10.07 | 11.22 | 10 | 12.52 | 13.61 | 13.95 | 14.98 | 15 | 15.64 | 17.26 | 18.05 | 18.87 | 25 | 20.95 | 24.92 | 26.78 | 27.18 | 30 | 23.27 | 28.86 | 31.32 | 31.51 |
| B | Input AvgSegSNR (dB) | Output AvgSegSNR (dB) | WP [3] | DCT [11] | Soft DCT [4] | () |
| −4.111 | −1.933 | −0.669 | −0.317 | 0.779 | −1.341 | 0.926 | 2.01 | 2.246 | 3.166 | 2.079 | 3.666 | 4.823 | 5.187 | 6.078 | 5.758 | 6.504 | 7.83 | 8.472 | 9.294 | 13.837 | 11.64 | 14.516 | 15.902 | 16.394 | 18.002 | 13.71 | 18.092 | 19.679 | 19.998 |
| C | Input SNR (dB) | PESQ | Input | WP [3] | DCT [11] | Soft DCT [4] | () |
| 0 | 1.06 | 1.27 | 1.38 | 1.36 | 1.74 | 5 | 1.36 | 1.58 | 1.78 | 1.76 | 2.07 | 10 | 1.69 | 1.95 | 2.19 | 2.14 | 2.39 | 15 | 2.04 | 2.31 | 2.58 | 2.52 | 2.71 | 25 | 2.81 | 2.86 | 3.32 | 3.21 | 3.32 | 30 | 3.21 | 3.06 | 3.64 | 3.53 | 3.66 |
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