Table 2.
User-selected AMP and β values in the subjective test (in training phase)
| Subject | LS | Input sound level (dB) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | ||
| 1 | SO | -11.95 | -19.66 | -26.71a) | -33.76 | -36.78 | -39.46 | -41.81 | -43.83a) | -46.85 | -48.29 |
| NO | -17.99 | -21.34 | -25.37b) | -30.74 | -32.97 | -40.47b) | -42.70 | -50.20 | -52.55 | -56.58 | |
| SIN | -8.59 | -13.62 | -16.31 | -21.34 | -24.36 | -29.40 | -30.07 | -34.09 | -40.81 | -48.19 | |
| β | 3.47 | 2.65 | 2.65 | 2.65 | 2.65 | 3.47 | 2.65 | 2.65 | 2.65 | 2.65 | |
| 2 | SO | -23.02 | -30.07 | -33.76 | -37.45 | -42.15 | -44.83 | -47.85 | -57.92 | -63.29 | -66.64 |
| NO | -2.89 | -12.28 | -18.99b) | -21.01 | -30.07 | -31.75b) | -38.46b) | -46.17 | -51.88 | -57.92 | |
| SIN | -8.93 | -13.96 | -16.64 | -21.34 | -27.05 | -31.07b) | -33.76 | -41.48 | -47.85 | -53.89a) | |
| β | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | 2.65 | 3.47 | 3.47 | |
| 3 | SO | -13.40 | -27.67 | -30.20 | -29.10 | -36.80 | -36.80 | -43.40 | -43.40 | -57.70 | -48.00 |
| NO | -23.32 | -23.32 | -34.32b) | -34.32 | -47.11 | -47.11b) | -53.51 | -60.65 | -60.65 | -60.65 | |
| SIN | -10.03 | -10.03 | -21.03 | -21.03 | -21.03 | -19.80 | -38.50 | -30.80 | -52.80 | -52.80 | |
| β | 3.47 | 2.65 | 3.47 | 2.65 | 3.47 | 1.76 | 3.47 | 1.76 | 3.47 | 3.47 | |
| 4 | SO | -15.30 | -20.00 | -25.03 | -33.09 | -36.78 | -37.79 | -42.48 | -45.17 | -54.68 | -54.68 |
| NO | -4.90 | -11.28 | -15.97b) | -18.99 | -23.69 | -29.73b) | -33.76b) | -35.77 | -41.14 | -46.51 | |
| SIN | -2.55 | -5.23 | -10.94 | -15.30 | -25.37 | -30.07 | -35.77 | -40.13 | -45.17 | -47.85 | |
| β | 2.65 | 1.76 | 1.76 | 1.76 | 3.47 | 3.47 | 3.47 | 3.47 | 2.65 | 2.65 | |
| 5 | SO | -6.30 | -15.10 | -21.70 | -25.00 | -28.30 | -30.50 | -31.90 | -38.50 | -41.01 | -52.09 |
| NO | -8.70 | -17.50 | -20.80b) | -24.30 | -28.70b) | -39.70b) | -41.90 | -47.40 | -49.60 | -50.70 | |
| SIN | 5.68 | 0.26 | -4.21 | -11.91b) | -17.41 | -20.71 | -20.71 | -31.71 | -33.91 | -43.81 | |
| β | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 1.76 | 2.65 | 1.76 | 2.65 | |
| 6 | SO | -13.96 | -20.34 | -26.38 | -27.72 | -33.42 | -36.44 | -40.81 | -45.17 | -51.54 | -54.23 |
| NO | -1.88 | -9.26 | -15.30b) | -18.99 | -26.38 | -29.40 | -34.09 | -39.80b) | -45.00 | -60.00 | |
| SIN | 1.14 | -4.90 | -9.60b) | -15.97 | -19.66 | -25.70 | -30.07 | -33.76 | -38.46 | -44.83 | |
| β | 3.47 | 2.65 | 2.65 | 2.65 | 3.47 | 2.65 | 2.65 | 3.47 | 2.65 | 2.65 | |
| 7 | SO | -0.61 | -6.11 | -13.81 | -21.51 | -29.21 | -34.71 | -36.91 | -39.11 | -43.51 | -42.41 |
| NO | -11.00 | -18.70 | -24.20b) | -29.70 | -30.80 | -34.10b) | -36.30b) | -37.40 | -41.80 | -44.00 | |
| SIN | 9.90 | 2.20 | -1.10 | -6.60 | -12.10 | -15.40 | -18.70 | -25.30 | -33.00 | -34.10 | |
| β | 2.65 | 3.47 | 2.65 | 2.65 | 2.65 | 1.76 | 3.47 | 2.65 | 2.65 | 1.76 | |
| 8 | SO | -10.36 | -13.66 | -20.78 | -25.21 | -29.15 | -29.15 | -37.27 | -37.27 | -40.22 | -43.18 |
| NO | -13.42 | -17.82b) | -20.02b) | -26.62 | -31.02 | -34.32b) | -39.76b) | -41.96 | -50.33 | -50.33 | |
| SIN | -7.99 | -10.92 | -16.37 | -21.51 | -21.52 | -28.66 | -35.55 | -41.95 | -45.15 | -50.31 | |
| β | 3.47 | 3.47 | 2.65 | 3.47 | 2.65 | 3.47 | 3.47 | 2.65 | 3.47 | 2.65 | |
| 9 | SO | -10.39 | -16.99 | -21.39 | -24.69 | -27.99 | -29.09 | -31.29 | -41.19 | -37.76 | -37.27 |
| NO | -16.21 | -23.91 | -30.51b) | -38.21 | -43.71b) | -49.21b) | -53.61 | -59.11 | -59.11 | -61.31 | |
| SIN | -7.00 | -9.71 | -15.86 | -19.55 | -23.49 | -28.90 | -35.55 | -36.53 | -39.98 | -43.42 | |
| β | 3.47 | 3.47 | 2.65 | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | 3.47 | |
| 10 | SO | -1.09 | -9.89 | -20.89 | -21.99 | -27.49 | -28.59 | -31.89 | -35.19 | -40.72 | -43.42 |
| NO | -8.61 | -11.91 | -17.41b) | -22.91 | -26.21 | -29.51 | -31.71b) | -35.01 | -37.21 | -40.51 | |
| SIN | 15.15 | 4.56 | -3.80 | -6.02 | -7.74 | -12.17 | -19.80 | -19.55 | -28.90 | -30.91 | |
| β | 3.47 | 3.47 | 3.47 | 3.47 | 2.65 | 2.65 | 2.65 | 2.65 | 3.47 | 2.65 | |
Repeated-measures analysis of variance (RM-ANOVA) revealed significant differences among the three listening situations for all input sound level (ISL), and further post-hoc analysis indicated that, in speech-in-noise conditions, subjects select significantly higher AMP values compared to speech-only and noise-only in all ISL levels except 90 dB where this was the case only in noise-only.
AMP, amplification constant; LS, listening situation; SO, speech-only; NO, noise-only; SIN, speech-in-noise.
a)
Not actually NO, but classified as NO.
b)
Not actually SO, but classified as SO.
a) and b) represent misclassified cases.