Division Geometrical divergence
United Kingdom
The attenuation due to geometrical divergence, Adiv, corresponds to a reduction in the sound level due to the propagation distance. For a point sound source in free field, the attenuation in dB is given by:
| Adiv = 20 × lg(d) + 11 | (2.5.12) |
where d is the direct 3D slant distance between the source and the receiver.