BRUEL & KJAER 2032 Instruction Manual page 167

13.2.18. Sound Intensity
The sound intensity is calculated according to the relationship:
where
~
r is the microphone spacing and
p
is the density of air.
p
is calculated accord-
ing to the relationship:
p
p
=
0,348534 . - - -
273
+
T
where p is the pressure in mbar
T is the temperature in
oc
l(k) is displayed for 1
~
k
~
800, and can be A-weighted.
13.2.19. Cepstrum Ch.A or Ch.B
The Power Cepstrum is defined as:
Cza(n)
=
y-
1 [ 10 log1o (
GAA
(k))]
0 ~ n ~ N-1 , 0 ~ k ~ N-1 , N
=
2048
The Analytical Power Cepstrum is defined as
,...-....._;
Cza(n)
=
C
8
(n)
+
j C
8
(n)
,...-....._;
where C
8
(n)
=
JF[
Caa(a)]
C
8
(n) is the traditional real-valued power cepstrum.
Cza(n) is displayed for
0
~ n ~
1023
in terms of:
Real part
Imaginary part
Magnitude
Similar fo Ch.B.
157