| 地铁样本 | 有效持时/s | 有效频段/Hz |
| 样本1 | 8.55 | 66.17 |
| 样本2 | 8.01 | 68.30 |
| 样本3 | 6.87 | 61.56 |
| 样本4 | 7.80 | 56.11 |
| 样本5 | 7.66 | 70.01 |
| 样本6 | 8.59 | 64.20 |
| 样本7 | 10.06 | 42.99 |
| 样本8 | 8.04 | 66.04 |
| 样本9 | 7.34 | 60.68 |
| 样本10 | 7.04 | 65.14 |
| 平均值 | 8.00 | 62.12 |