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4.4 .5 SignaL-to-noise ration, linear
• Set
the
maximum output level with the VOLUME
~
(10J
key
.
• Play test CD No
.
3, TRACK
2
(left-hand channel
kHz)
and adjust the level difference to
0
d8
.
• Play test CO No.3, TRACK
18
(digital silence)
.
• Via
a 30
kH~
low-pass measure alL outputs LEFT
I
RIGHT
(25], FIXED (26J, and VARIABLE [27J
:
• The measured value should be better than 96 dB.
4 .4.6
Signal-to-noise ration, weighted
Set
the
maximum output level with the VOLUME
~
[10J
key.
• Via a 30 kHz Low-pass
and
an A-weighing filter
measure
all outputs lEFT
I
RIGHT (25
)
, FIXEO [26J, and VARIABLE
(27J:
• Play test CD No
.
3, TRACK
2
(left-hand channel
I
1 kHt>
and adJust the level difference to 0 d8.
• Play test CD No.3, TRACK 18 (digitaL siLence)
.
• The measured value should be better than
100
dB
.
4.4
.
7 Phase linearity
->
Fig. 4.14
• Set
the
maximum output level with the VOLUME
+
(10J
key
.
• Play test CD No.3, TRACK 20.
• The
meaSurement
is to
be
performed with the
baLanced
and
the
unbalanced outputs
.
•
Conne~t
the
eRO to one of the
OUtpufS
and
visually
examine the square-wave signals
at 100
Hz, 400 Hz, 1002
Hz.
and 5512
HZ.
The wave shape should be symmetrical.
(Fig. 4.14>
4 .4 .8
Ac~u~tical
check
• Play test CD No.
SA and listen for reproduction errors
(interruptions)
.
• The test CD contains the following simulated errors
:
information interruptions of
400
...
900
~rn
on TRACK 5
-
TRACK 9
.
Slack dot s of 300
..
. 800 IJm on TRACK 11 - TRACK 17
.
Simulated fingerprint
on
TRACK
18
and 19.
• Of
course,
this
assessment
i
s only possible with
an
error-free
test
CO that has been
handled
carefully.
Additionally
introduced errors can cumulate
with
the
simulated errors and
~an
cause Interruption of the rep-
roduction process
.
An7
E 4{9·
11\'r--
~,
. r
tfM----#M
r
,
IOOHl
f
=
400Hz
~
.AA
Ii
vv
'
~
I002HZ
I/WN_.W
Fig. 4.14
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