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 0.70° 4
Launch direction
 Θlaunch 0.94° 1
ϕlaunch 0.70° 4
Propagation delay 41.75 ms 4

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