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INTRODUCTION ORBAN Model 8400
Flexible Configuration
• The OPTIMOD-FM Audio Processor is supplied with analog and AES/EBU digital
inputs and outputs. Both digital input and digital output are equipped with sample-
rate converters and can operate at 32 kHz, 44.1 kHz, and 48 kHz sample rates. The
pre-emphasis status and output levels are separately adjustable for the analog and
digital outputs.
• OPTIMOD-FM has an internal, DSP-based stereo encoder (with a proprietary
composite processor) to generate the pilot tone stereo baseband signal and control its
peak level.
• The analog inputs are transformerless, balanced 10kΩ instrumentation-amplifier
circuits, and the analog outputs are transformerless balanced, and floating (with 50Ω
impedance) to ensure highest transparency and accurate pulse response.
• OPTIMOD-FM has two independent composite baseband outputs with digitally
programmable output levels. Robust line drivers enable them to drive 100 feet of RG-
59 coaxial cable without audible performance degradation.
• OPTIMOD-FM has a subcarrier input that is mixed with the output of OPTIMOD-
FM’s stereo encoder before application to the composite output connectors.
• All input, output, and power connections are rigorously RFI-suppressed to Orban’s
traditional exacting standards, ensuring trouble-free installation.
• OPTIMOD-FM precisely controls the audio bandwidth to 15 kHz. This prevents
overshoots in uncompressed digital links operating at a 32 kHz-sample rate and pre-
vents interference to the pilot tone and RDS (or RBDS) subcarrier.
• OPTIMOD-FM Audio Processor is designed to meet all applicable international
safety standards.
Adaptability through Multiple Audio Processing Structures
• A processing structure is a program that operates as a complete audio processing
system. Only one processing structure can be on-air at a time, although both are ac-
tive simultaneously to permit mute-free switching between them. OPTIMOD-FM re-
alizes its processing structures as a series of high-speed mathematical computations
made by Digital Signal Processing (DSP) chips.
• OPTIMOD-FM features two processing structures: Five-Band (or Multiband) for a
consistent, “processed” sound, free from undesirable side effects, and Two-Band for
a transparent sound that preserves the frequency balance of the original program ma-
terial. A special Two-Band preset creates a no-compromise “Protect” function that is
functionally similar to the “Protect” structures in earlier Orban digital processors.
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