Overview; User-Friendly Interface; Absolute Control Of Peak Modulation; Flexible Configuration To Interface With Analog And Digital Systems - Orban OPTIMOD-FM 8200 Operating Manual

OPTIMOD-FM 8200

OPTIMOD-FM 8200 DIGITAL Audio Processor

Orban's OPTIMOD-FM 8200 DIGITAL Audio Processor is a complete audio processing
system for FM broadcast.

User-Friendly Interface

•
A large liquid-crystal display (LCD) makes setup, adjustment and programming
of the 8200 easy. The screen clearly shows all metering functions of the process-
ing structure in use.
•
Push one of the clearly labeled soft keys to RECALL a preset, to MODIFY
processing, to program Automation Preset Switching, or to access SYSTEM
SETUP.
•
HELP is always available at the push of a button. If you get lost, ESC will always
bring you back home. If you desire, you don't even need this manual to adjust and
program the 8200. Step-by-step instructions are on the screen.

Absolute Control of Peak Modulation

•
The 8200 provides universal transmitter protection and audio processing for FM
broadcast. It can be configured to interface ideally with any commonly-found
transmission system in the world.
•
The 8200 Audio Processor provides pre-emphasis limiting for the internationally-
used pre-emphasis curves of 50
never audibly apparent, producing a clean, open sound with subjective brightness
matching the original program.
•
The 8200 achieves extremely tight peak control; overshoot is limited to < 0.3dB!
•
The 8200's stereo encoder (stereo generator) uses Orban's ROM-based, digitally-
controlled Hadamard-Transform circuit topology to produce a circuit with
excellent specs, high stability, and uncompromising baseband spectrum control.
The encoder has two outputs with independent level controls, each capable of
driving 75Ω in parallel with 47,000pF, (100ft/30m of coaxial cable).
•
By integrating the stereo encoder with the audio processing, the 8200 eliminates
the overshoot problems that waste valuable modulation in traditional external
encoders.
•
The 8200 prevents aliasing distortion in subsequent stereo encoders or transmis-
sion links by providing bandwidth-limiting and overshoot compensated 15kHz
low-pass filters ahead of the 8200's audio outputs and stereo encoder.

Flexible Configuration to Interface With Analog and Digital Systems

•
The 8200 Audio Processor is designed to meet all applicable international safety
standards.
µ µ
s and 75 s. Its pre-emphasis control is almost
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INTRODUCTION