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BRUEL & KJAER 2204 - Sound and Vibration Spectrograms

BRUEL & KJAER 2204
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UA
0049
Statistical
Distribution
-F63716'
Fig. 9.7.
Set-up
for
finding
the
statistical distribution
of
sound
level during
a
day.
Uni
ts
~
of
t
im
e
'''"
"'
''
I
Sound Pressure
Le
vel
(63716
Fig. 9.8.
Statistical
distribution
of
sound
pressure level on a
street
corner
during
a day.
distribution,
i.e.
it
gives
the
total
time
that
the
signal
has
exceeded
a
certain
level.
One
counter
counts
the
total
number
of
pulses
and
thus
relative
distribution
curves
can
be
made
up
from
the
data
given
by
the
counters.
A
sketch
of
the
set
-
up
for
finding
the
statistical
distribution
of
the
sound
pressure
level
on
a
street
corner
during
a
day
is given
in
Fig. 9.
7,
and
the
data
obtained
are
given
in
Fig.
9.8. See B & K
Technical
Review
No.
1,
1964.
Sound
and
Vibration
Spectrograms.
When
the
Band-Pass
Filter
Set
Type
1612 is
connected
to
the
EXT.
FILTER
sockets
of
the
Sound
Level
Meter
and
the
Level
Recorder
Type
2305
to
the
OUTPUT
socket,
complete
octave
and
l/3
octave
spectrograms
of
sound
and
vibration
signals
can
be
recorded
automatically.
The
pulses
required
to
drive
62

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