Flexible Configuration - Orban OPTIMOD-FM 8500S Operating Manual

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INTRODUCTION

Flexible Configuration

"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.
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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
automatically update the "program type" field to complement the program-
ming by recalling a audio processing preset for a given program type.
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OPTIMOD-FM 8500S 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.
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A loop-through connection is provided to enable a ratings encoder (such as
Arbitron®) to be inserted between the output of the audio processing and the
input to the stereo encoder. . In "ratings encoder loop-through mode," the sec-
ond digital output drives the ratings encoder from the output of the FM process-
ing.
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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
8500S can switch automatically to the secondary input.
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The 8500S 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.
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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 8500S's internal clock. The sync source
of each AES3 output is independently selectable.
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A wordclock/10 MHz sync reference input accepts a 1x 5V p-p squarewave
wordclock signal at 32, 44.1, 48, 88.2, or 96 kHz, or a 10 MHz sinewave or
squarewave signal, 0.5 to 5 V peak. 10 MHz is a common output frequency pro-
duced by GPS and rubidium frequency standards. You can configure the 8500S to
ORBAN MODEL 8500S