Orban OPTIMOD-FM 5500 Operation Manual page 83

OPTIMOD-FM DIGITAL
1x wordclock applied to the 5500's R
(the internal crystal-controlled DSP clock oscillator).

If D
input, the 5500 automatically switches the sync source to the R
BNC connector. If there is no valid digital input signal at the reference
input, the sync source defaults to the 5500's internal clock.

If R
connector, the sync source defaults to the 5500's internal clock.
E) Press Next. Then set the DO S
You can choose P
mined by the P
chronized to the sample rate appearing at the 5500's AES3 input).

If D
input, the 5500 automatically switches the sync source to the source
determined by the P
F) Set the desired output W
[14], [16], [18], [20], or [24], in bits
The largest valid word length in the 5500 is 24 bits
The 5500 can also truncate its output word length to 20, 18, 16 or 14 bits.
The 5500 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 5500 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 5500.
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 (8.B) in page 2-33.
J) Press the Prev button.
I is chosen and no valid signal is available at the unit's digital
IG N
is chosen and there is no valid input signal at the R
I
EF N
YNC
S (the DSP clock frequency reference as deter-
ILOT YNC
S control) or D
ILOT YNC
I is chosen and no valid signal is available at the unit's digital
IG N
S
ILOT
L
ORD ENGTH
to I or O , as desired.
N UT
L control. This is first-order noise shaped dither
ORD ENGTH
F to AES or SPDIF.
ORMAT
to FM, FM+D
OURCE ELAY
BNC connector), or I
I
EF N
.
I (the output sample rate is syn-
IG N
control.
YNC
.
, or M .
ONITOR
INSTALLATION
NTERNAL
I
EF N
BNC
I
EF N
2-35