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4.4.
MEASURING THE AUDIO DATA
• Harmonic distortion
• Output Level and channeL baLance
I
Frequency response
• Channel separation
• SignaL-to-noise ratio, Linear
• Signal-to-noise ratio, weighted
• Phase linearity
• Aural assessment
4.4.1
Harmonic distortion
-) Fig,
4,1~
• Measuring arrangement according to Fig
.
4.13 with
dis-
tortion measurement liLter connected to VARIABLE OUrpUT
(27)
• Set
the
maximum output level with the VOLUME
+
(10J
key.
I
Play test CO No.3. For measuring the Left-hand channel
play TRACK 4, for the right-hand channeL TRACK 8.
The distortion should be less than 0 .006X lor all fre-
quen,jes of TRACK 4 or TRACK 8.
o
The same measurements shouLd aLways be made on the
ba-
lanted
outputs LEfT
I
RIGHT [25J and on the unbalanced
outputs
FIXED
OUTPUT (26J.
4.4.2 Output level and channel balance
I
Set
the
maximum outlet level with the VOLUME
+
(10J
key.
I
Play
test CD No
.
4, TRACK
2/3.
I
~ith
an
audio
voLtmeter measure the
levels
on
the
outputs FIXEO (261 and VARIABLE [27).
I
The measured value should be 2
.
2 V RMS
~10Y..
Channel balance: better than 0 .2 dB.
I
Connect
the
audio voltmeter to the
balanced outputs
LEFT I
RIGHT [2S),
•
Th~
measured
level should correspond
to
the
studio
level. If this is not the case, adjust the output level
(Section 4.3.7),
4.4.3 Frequency response
•
Cne,~
the output level (Section 4.4,2).
• Play test CO No.3, TRACK 2 (left-hand channel 11kHz)
and adjust the Level reference to 0 dB.
I
Play
tESt
CO No.3,
TRACK 4 for the lett-hand
~hannel
and
TRACK
8
for the right-hand channel.
• At
maximum output Level,
the frequency response of alL
outputs
LEFT'
RIGHT [2S1,
FIXEO
[26),
and
VARIABLe
(27)
should
be
within the tolerance of
~0
.
1
dB for all
test frequencies (41 Hz,
101
Hz,
997
HZ,
3163
Hz,
6373
HZ,
10007
Hz,
16001
Hz,
19001
Hz, 19997
Hz)
.
4
.
4.4
Channel separation
• Set the maximum output level with the VOLUME [10) key
.
I
PLay test CO No
.
3, TRACK 2 (Left-hand channel 11kHz)
and adjust
the
Level
reference
to
0
dB.
• Via a
30
kHz
Low-pass, measure all outputs LEFT
I
RIGHT
(25), FIXEO 1261, and VARIABLE (27):
TRACK
4
for measuring the channel separation L -> R
TRACK 8 for measuring the channel separation R -) L
I
The
channel
separation
at
1
~Hl
should be
at
Least
90 dS
.
A727
E 4/8
A727
t--
FILTER
t--
DISTORTION
I--
FREQUENCY
CD-PLAYER
BRIDGE
COUNTER
Fig
.
4.13
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