Open Access
Table 1
Maximum consecutive variation of sound propagation parameters. The data represents the maximum values over all studied scenarios. Only the air attenuation exceeds the specified threshold but just at higher frequencies with significant damping (at least 64 dB). For the propagation delay no threshold is specified.
| Parameter | Threshold | Maximum variation | Scenario |
|---|---|---|---|
| Spreading loss | 1 dB | 0.3 dB | 2 |
| Air attenuation | 1 dB | 7.5 dB @ 20 kHz (<1 dB in audible frequency bands) | 3 |
| Incident direction | |||
| Θin | 1 | 0.98° | 1 |
| ϕin | 1° | 0.70° | 4 |
| Launch direction | |||
| Θlaunch | 1° | 0.94° | 1 |
| ϕlaunch | 1° | 0.70° | 4 |
| Propagation delay | – | 41.75 ms | 4 |
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