Table 2 Comparison of noise rating scale results (with 95% confidence interval)
From: Integrated acoustic echo and background noise suppression technique based on soft decision
Environments | Noise rating scale | |||
|---|---|---|---|---|
Noise | SNR (dB) | IS-127+Turbin et al. | Gustafsson et al. | Proposed |
White | 5 | 1.40 ± 0.24 | 1.65 ± 0.35 | 2.55 ± 0.36 |
|  | 10 | 1.45 ± 0.24 | 2.20 ± 0.62 | 2.60 ± 0.53 |
|  | 15 | 1.85 ± 0.51 | 2.75 ± 0.30 | 2.80 ± 0.54 |
|  | 20 | 2.35 ± 0.51 | 3.20 ± 0.45 | 3.20 ± 0.39 |
Babble | 5 | 1.20 ± 0.24 | 1.20 ± 0.19 | 1.30 ± 0.22 |
|  | 10 | 1.60 ± 0.38 | 1.65 ± 0.41 | 1.75 ± 0.37 |
|  | 15 | 1.95 ± 0.39 | 1.90 ± 0.37 | 2.15 ± 0.46 |
|  | 20 | 2.30 ± 0.40 | 2.45 ± 0.32 | 2.45 ± 0.32 |
Vehicle | 5 | 1.95 ± 0.32 | 3.20 ± 0.29 | 3.60 ± 0.53 |
|  | 10 | 2.10 ± 0.26 | 3.35 ± 0.27 | 3.55 ± 0.28 |
|  | 15 | 2.00 ± 0.30 | 3.40 ± 0.28 | 3.45 ± 0.28 |
|  | 20 | 2.10 ± 0.40 | 3.40 ± 0.32 | 3.60 ± 0.35 |