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 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.