OPTIMOD-FM DIGITAL
INSTALLATION
2-29
The 8300 can also truncate its output word length to 20, 18, 16 or 14 bits.
The 8300 can add dither for input material that is insufficiently dithered
for these lower word lengths (see the next step).
F)
Adjust
D
ITHER
to
I
N
or
O
UT
, as desired.
[In] or [Out]
When set to In, the 8300 adds “high-pass” dither before any truncation
of the output word. The amount of dither automatically tracks the set-
ting of the
W
ORD
L
EN
control. This is first-order noise shaped dither that
considerably reduces added noise in the midrange by comparison to
white PDF dither. However, unlike extreme noise shaping, it adds a
maximum of 3 dB of excess total noise power when compared to white
PDF dither. Thus, it is a good compromise between white PDF dither and
extreme noise shaping.
If the source material has already been correctly dithered (as is true for
virtually all commercially recorded material), you may set this control to
OUT
. However, particularly if you use the Noise Reduction feature, the
processing can sometimes attenuate input dither so that it is insufficient
to dither the output correctly. In this case, you should add dither within
the 8300.
G)
Set
D
IGITAL
F
ORMAT
to AES or SPDIF
H)
Set the
O
UT
S
OURCE
to
FM
or
HD
.
I)
Press the
P
REV
button.
J)
Set the
DO
100%
control.
If the
O
UT
S
OURCE
is set to
FM
: Using a modulation monitor or modulation
analyzer, adjust the
DO
100%
control to make the modulation monitor
read 100% modulation (usually
75 kHz deviation).
See the notes in step (7.D) on page 2-27
If the
O
UT
S
OURCE
is set to
HD
: Adjust the
DO
100%
control so that the peak
modulation of the digital channel does not exceed 0 dB. Note that the
look-ahead limiter may exhibit up to 2 dB of overshoot on certain program
material, so set the level conservatively. You must use a preset without
“UL” in its name to make this adjustment.
This should not cause any problems because matching the loudness of
the FM and digital channels at the HD receiver permits the digital peak
limiting to be much lighter than the analog peak limiting, thanks to the
fact that receiver has 5 dB higher gain on the HD channel than on the
analog channel.
9.
End Analog and Digital I/O setup.
If you are using a external AGC and you temporarily set the
E
XT
AGC
to
NO
in
step 1 on page 2-24, set the
E
XT
AGC
to
Y
ES
.
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
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Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...
