Calculation of sound attenuation according to ISO 9613 - 2

1: Properties of source and atmosphere:

ni slike
Air preasure in Pa
(usualy 101325)
Air temperature
in oC
Relative humidity
in %
Frekvency
in Hz

Distance
(d) in m
Height of source
(hs) from ground in m
Height of receiver
(hr) from ground in m

ni slike 2: Barrier properties:

dss
in m
dsr
in m
e
in m
a
in m



dB. Attenuation of sound in dB from source to receiver.

Tolmin feb.2001
Leban Branko