| Feature Extraction Methods | Word Accuracy [%] | ||||
| Clean Speech | SNR [dB] | ||||
| 30 | 20 | 10 | 5 | ||
| MFCC + ∆ + ∆∆ | 98.95 | 98.45 | 97.92 | 94.87 | 90.37 |
| LPCC + ∆ + ∆∆ | 99.95 | 98.59 | 97.63 | 93.27 | 82.73 |
| PLP + ∆ + ∆∆ | 99.95 | 98.50 | 98.35 | 93.42 | 93.52 |
| RASTA-PLP + ∆ + ∆∆ | 99.75 | 98.46 | 95.93 | 91.92 | 88.24 |
| LPCC + PLP + RASTA | 98.93 | 96.32 | 94.10 | 90.52 | 82.73 |
| MFCC + LPCC + PLP | 98.79 | 97.92 | 94.05 | 86.31 | 89.41 |
| MFCC + LPCC + RASTA | 99.12 | 95.50 | 94.00 | 92.45 | 76.69 |
| MFCC + PLP + RASTA | 98.93 | 94.53 | 94.05 | 90.32 | 76.25 |