TABLE II. SNRIMP Values Obtained by Different Filtering Methods on SimEMG, MIT-BIH-EMG and Synth Databases.
| SNRIN | SNRIMP/std IRM [dB] | SNRIMP/std AWWF [dB] | SNRIMP/std WT [dB] | SNRIMP/std FIR [dB] | |
|---|---|---|---|---|---|
| SimEMG | <4 | 10.31/ 2.6 | 9.23/ 2.1 | 4.59/ 1.1 | 4.19/ 0.7 |
| 4-8 | 10/ 3 | 8.57/ 2.4 | 3.84/ 1.1 | 3.83/ 1.1 | |
| 8-12 | 7/ 2 | 6.27/ 1.8 | 2.15/ 1.5 | 3.18/ 0.8 | |
| 12-16 | 5.17/ 2.9 | 4.57/ 2.1 | -1.41/ 2.6 | 2.17/ 1.1 | |
| 16-20 | 3.36/ 1.6 | 3.26/ 1.3 | -2.38/ 2.1 | 1.45/ 0.8 | |
| >20 | 1.32/ 0 | 2.14/ 0 | -7.18/ 0 | 0.22/ 0 | |
| average | 7.8/ 3.6 | 6.92/ 3 | 1.94/ 3.2 | 3.22/ 1.3 | |
| MIT-BIH-EMG | <4 | - | - | - | - |
| 4-8 | 7.56/ 1.2 | 7.03/ 1 | 1.41/ 0.9 | 0.67/ 0.1 | |
| 8-12 | 8.07/ 1.4 | 5.8/ 0.9 | 0.59/ 0.9 | 0.47/ 0.2 | |
| 12-16 | 7.41/ 1.9 | 5.52/ 0.8 | -0.08/ 1.7 | 0.43/ 0.2 | |
| 16-20 | 4.86/ 2.3 | 4.7/ 1.2 | -0.39/ 1.5 | 0.23/ 0.5 | |
| >20 | 1.83/ 1.5 | 2.7/ 0.8 | -0.71/ 0.1 | 0.22/ 0.1 | |
| average | 7.46/ 2 | 5.69/ 1.1 | 0.35/ 1.4 | 0.45/ 0.3 | |
| Synth | <4 | 7.38/ 1.4 | 8.39/ 1 | 1.22/ 0.9 | 1.07/ 0.1 |
| 4-8 | 8.81/ 1.7 | 7.93/ 0.8 | 1.17/ 0.7 | 1.06/ 0.1 | |
| 8-12 | 8.93/ 1.8 | 6.85/ 0.8 | 0.82/ 0.5 | 1.02/ 0.1 | |
| 12-16 | 9.56/ 1.9 | 5.84/ 1.2 | 0.8/ 0.3 | 0.98/ 0.1 | |
| 16-20 | 8.15/ 1.5 | 4.48/ 0.4 | 1.16/ 0.1 | 0.98/ 0 | |
| >20 | |||||
| average | 8.54/ 1.8 | 7.75/ 1.1 | 1.11/ 0.7 | 1.05/ 0.1 |
SNRIN - SNR of input signals; SNRIMP - SNR improvements for different denoising algorithms. Gray values represent highest SNRIMP for specific SNRIN range. Bolded values indicate that there is statistical significance between the IRM and AWWF methods.