Table 2
Inside third octave band spectra for a car pass-by calculated over 7 s and for the sequences 1 and 13 during the continuous traffic flow (background noise calculated over 7 s too).
| Frequencies Hz | Car pass-by dB | Background noise for sequence 1 – dB | Background noise for sequence 13 – dB | Silence of the laboratory – dB |
|---|---|---|---|---|
| 100 | 41.9 | 41.4 | 28.5 | 24.5 |
| 125 | 40.2 | 39.5 | 27.5 | 24.5 |
| 160 | 43.0 | 39.0 | 26.1 | 22.1 |
| 200 | 43.1 | 39.4 | 25.7 | 20.1 |
| 250 | 37.6 | 36.0 | 22.2 | 16.2 |
| 315 | 36.7 | 30.0 | 16.8 | 12.3 |
| 400 | 31.1 | 24.6 | 12.7 | 10.0 |
| 500 | 29.5 | 21.4 | 11.1 | 9.5 |
| 630 | 29.8 | 22.5 | 11.8 | 10.1 |
| 800 | 30.8 | 24.5 | 12.4 | 9.4 |
| 1000 | 35.4 | 28.4 | 14.7 | 8.9 |
| 1250 | 32.2 | 25.7 | 12.5 | 8.1 |
| 1600 | 27.3 | 21.9 | 10.3 | 7.8 |
| 2000 | 22.4 | 16.6 | 8.1 | 7.1 |
| 2500 | 15.7 | 10.5 | 6.7 | 6.5 |
| 3150 | 14.6 | 8.6 | 6.1 | 6.0 |
| 4000 | 9.7 | 8.8 | 6.5 | 6.4 |
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