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BRUEL & KJAER 2204 - Frequency Response and Directivity Pattern of Loudspeakers; Satistical Distribution of Sound Levels

BRUEL & KJAER 2204
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Frequency
Response
and
Directivity
Pattern
of
Loudspeakers.
The
Sound
Level Meter is
very
well
suited
for
obtaining
the
frequency
response
and
the
directivity
pattern
of
sound
sources.
An
example
is
given
in
Fig. 9.5,
where
the
loudspeaker
to
be
tested
is
placed
on
a
Turntable
Type
.3921
and
fed
from
a B & K
Beat
Frequency
Oscillator
Type
1022,
covering
the
frequency
range
20
to
20ooo
Hz.
The
Level
Recorder
can
take
polar
£ecording
paper
as
well
as
ordinary
lengths,
and
the
motion
of
the
Turn-
Fig. 9.6. Directivity pattern
of
the
loudspeaker
obtained
from
the
set-up
o/
Fig. 9.5.
table
is
synchronized
with
the
paper
drive
of
the
Recorder
to
give
the
directivity
pattern
directly.
The
results
obtained
from
such
a
test
are
given
in
Fig. 9.6.
Statistical
Distribution
of
Sound
Levels.
Used
in
connection
with
the
B & K
Statistical
Distribution
Analyzer
Type
4420
the
Sound
Level
Meter
may
be
used
for
collecting
statistical
data
on
noise
and
vibration.
The
Statistical
Distribution
Analyzer
consists
mainly
of
.a
pulse
generator
and
thirteen
digital
counters.
The
pulses
are
distributed
to
twelve
of
the
counters
from
the
writing
arm
of
the
B & K
Level
Recorder
Type
2305.
The
writing
width
of
the
Level
Recorder
is
divided
into
ten
bands*)
and
the
number
of
counts
indicate
how
much
time
the
writing
stylus
has
spent
in
each
band,
giving
the
statistical
distribution
of
the
sound
level
with
respect
to
time.
The
Distribution
Analyzer
can
also
be
set
to
cumulative
*)
The
writing
width
of
the
Level
Recorder
can
cover
signal
variations
of
10,
25,
50
or
75
dB depending on
which
potentiometer
is used.
61

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