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i PINK NOISE
ePink noise is used for measurement
and correction of the
sound field frequency response because it is mostly within the
audible range, its energy distribution is uniform, and it has a
the
Response of white noise
oB
(oso
Response of filter
wide frequency band.
oy
Because pink noise has large instantaneous level fluctuations,
—3dB/oct
display may fluctuate.
aes
<Frequency response of pink noise>
3dB/oct
—>
1
—> |
98 1 Response of pink noise
a
a
7
Frequency (Hz)
Mi HOW
TO USE THE REAL-TIME SPECTRUM
ANALYZER
below.
@
As the sound volume of amplifier is increased through operations as shown below, the sound volume of pink noise increases,
and then the sound field frequency characteristics can be measured (displayed on spectrum analyzer).
—)
Speaker
Speaker
® Adjust the
system
system
volume to an
(Left)
(Right)
appropriate
level.
Volume control: "0"
Balance control: "center position"
Excessively raising the amplifier
© Tone controls:
O/elt Ps aatan| i ee aéidlh mode selector
volume or the band level controls of this
"center position"
at 'ie it ea Sion
a
unit during measurement or correction
input Suleclor anak
"tape"
i
ici
oitetaien
y t
aedaroy er ete
sa shasiste
elf the amplifier has a tape-monitor selector and
the sound will approach the limits of the
- input isan
eat
audible range and be difficult to hear,
det
cael
ee
P
thus increasing the likelihood of a
be on" (Ma)
mistaken assumption that there is no
=
output.
i
Recommended
microphone:
RP-3800E
(sold separately)
© "on" (M. =)
"off?
© "0dB" (mB)
Set the switch on the microphone to
(Change it over according to the
"on.
sensitivity of microphone.)
(Position the microphone at the place and
Select the channel for sound field measurement by
height at which you usually listen to your
setting to "on" (M_ =).
audio equipment.)
@® Adjust the display so that it is easy to see (approximately
the 20-dB level).
(The display at this time shows the sound field frequency
response.)
—
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