Orban OPTIMOD-FM 8600Si, Руководство по эксплуатации

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INTRODUCTION ORBAN MODEL 8600Si
rial, accuracy is 0.2 dB
Without true peak control, analog clipping can occur even if all peak values of
the digital samples are below 0 dBFS. This phenomenon has also been termed
“
0 dBFS+ .”
Thanks to true peak control,
sample rate conversion , unless it removes high
frequency program energy or introduces group delay distortion, cannot cause
sample peaks to increase more than 0.5 dB . For example, sample rate con-
version from 48 kHz to 44.1 kHz is highly unlikely to cause sample peak clipping
in the 44.1 kHz audio data.
Flexible Configuration
•
A built-in RDS/RBDS encoder supports the most important RDS features and
can be associated with processing presets so that mixed-format stations can au-
tomatically update the “program type” field to complement the programming
by recalling a audio processing preset for a given program type.
•
OPTIMOD-FM 8600Si is supplied with analog and AES3 digital inputs and
outputs . The digital input and the two digital outputs are equipped with sam-
ple-rate converters and can operate at 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz, and
96 kHz sample rates. The preemphasis status and output levels are sepa-
rately adjustable for the analog and digital outputs. Each output can emit the
analog FM processed signal, the analog FM processed signal with diversity delay
applied, the digital radio processed signal, or the low-delay monitor signal.
•
A loop-through connection is provided to enable a ratings encoder (such as
Nielsen Audio ®) to be embedded in the audio processing. (See Connecting a
Ratings Encoder on page 2-8.)
•
Failsafe switching detects loss of audio on the primary input, which you can
assign to be the analog or digital input. If audio is lost on the primary input, the
8600Si can
switch automatically to the secondary input .
•
The 8600Si has two independent equalizers, multiband compressors, and
peak limiters for the FM analog and digital media processing channels ,
allowing you to separately optimize the processing for each.
•
An AES11 sync input allows you to synchronize the output sample rate of ei-
ther (or both) AES3 outputs to this input. You can also synchronize the out-
puts to the AES3 digital input or to 8600Si’s internal clock . The sync
source of each AES3 output is independently selectable.
•
A defeatable diversity delay can delay the FM analog processing output up to
16.2 seconds . Delay can be trimmed in intervals of one sample of 64 kHz to
match the analog and digital paths in the HD Radio system, eliminating the