TABLE I.
Reverberation time (T30) and standard deviations measured in the three rooms per octave band. The babble noise spectrum (dBA) was measured per octave band using the HATS.
| Parameter (s.d.) | Room | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|
| T30 (s) | Anechoic | 0.05 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
| (0.005) | (0.007) | (0.006) | (0.005) | (0.005) | (0.005) | (0.007) | ||
| T30 (s) | Semi-reverberant | 1.01 | 0.92 | 0.78 | 0.79 | 0.79 | 0.73 | 0.55 |
| (0.02) | (0.06) | (0.02) | (0.01) | (0.02) | (0.02) | (0.02) | ||
| T30 (s) | Reverberant | 1.26 | 1.82 | 2.23 | 2.52 | 2.33 | 1.66 | 1.01 |
| (0.06) | (0.03) | (0.06) | (0.04) | (0.11) | (0.05) | (0.02) | ||
| Babble noise spectrum (dBA) | 34.8 | 46.6 | 58.1 | 59.0 | 48.3 | 40.1 | 27.1 |