Orban OPTIMOD-FM 8500S Operating Manual page 89

OPTIMOD-FM DIGITAL
2 In (the output sample rate is synchronized to the sample rate ap-
D
IG
pearing at the 8500S's BNC AES3 input).
•
If D 1 IN
IG OR
tal input, the 8500S automatically switches the sync source to the source de-
termined by the P
F) Set the desired output W
[14], [16], [18], [20], or [24], in bits
The largest valid word length in the 8500S is 24 bits
The 8500S can also truncate its output word length to 20, 18, 16 or 14
bits. The 8500S can add dither for input material that is insufficiently
dithered for these lower word lengths (see the next step).
G) Adjust D
ITHER
[In] or [Out]
When set to In, the 8500S adds "high-pass" dither before any truncation
of the output word. The amount of dither automatically tracks the set-
ting of the W
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 8500S.
H) Set D
IGITAL
SPDIF is the standard consumer format; AES is almost always correct in
professional facilities.
I) Set the DO S
See the notes in step (10.B) in page 2-30.
J) Navigate to Setup > I/O C
Ratings Encoder Loop-through feature, repeat steps (B) through (I) for DO2. If
you are using the Ratings Encoder Loop-through feature, follow the proce-
dure in step (K) below.
K) If you are using the Ratings Encoder Loop-through feature, perform the fol-
lowing steps (see Connecting a Ratings Encoder on page 2-8):
a) Set the DO2 O
You cannot use DO1 for this purpose. This is the essential difference be-
tween DO1 and DO2.
b) Connect your Optimod's DO2 output to the AES3 input of the ratings
encoder.
D 2 I is chosen and no valid signal is available at the unit's digi-
IG N
control.
S
ILOT YNC
L
ORD ENGTH
to I or O , as desired.
N UT
control. This is first-order noise shaped dither
L
ORD ENGTH
to AES or SPDIF.
F
ORMAT
to FM, FM+D
OURCE ELAY
> D
ALIB
control to R
S
UT OURCE
.
, HD or M
.
ONITOR
O 2 C . If you will not be using the
IG UT ALIB
.
ATINGS
2-33
INSTALLATION