OPTIMOD INTRODUCTION
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can be adjusted so that it substitutes for the broadband AGC circuitry in OPTIMOD-
DAB, which is then defeated.
User-Friendly Interface
• A liquid crystal display (LCD) makes setup, adjustment and programming of
OPTIMOD-DAB easy. Dynamically labeled soft keys provide a context-sensitive in-
terface. Dedicated LEDs show all metering functions of the processing structure in
use.
• Push one of the dedicated buttons to “Recall” a preset, to “Modify” processing, or to
access the system’s Setup controls.
Flexible Configuration
• OPTIMOD-DAB precisely controls peak levels to prevent overmodulation. The
maximum level of the digital samples is controlled to better than 1%.
• The OPTIMOD-DAB Audio Processor is supplied with analog and AES/EBU digi-
tal inputs and outputs. Both digital input and digital output are equipped with sam-
ple-rate converters and can operate at 32kHz, 44.1kHz, and 48kHz sample rates.
• The analog inputs are transformerless, balanced 10kΩ instrumentation-amplifier cir-
cuits, and the analog monitor outputs are transformerless balanced, and floating with
30Ω impedance to ensure highest transparency and accurate pulse response.
• All input, output, and power connections are rigorously RFI-suppressed to Orban’s
traditional exacting standards, ensuring trouble-free installation.
• OPTIMOD-DAB controls the audio bandwidth as necessary to accommodate the
transmitted sample frequency. OPTIMOD-DAB’s high frequency bandwidth can be
switched instantly (typically in 500Hz increments) between 4.0kHz and 20kHz.
20kHz is used for highest-quality systems. 15kHz meets the requirements of the pro-
posed AM IBOC systems that use 32kHz sample frequency. 10kHz bandwidth meets
the requirements of auxiliary Eureka-147 transmissions using a 24kHz sample fre-
quency. Lower audio bandwidths meet the requirements of auxiliary speech grade
services and the proposed digital shortwave systems.
• OPTIMOD-DAB is equipped with a second serial port to interface to a DAB trans-
mitter. This serial port is intended to support PAD (Program-Associated Data)
services. (This support is not available with Firmware Version 2.0 or lower.)
• OPTIMOD-DAB Audio Processor is designed to meet all applicable international
safety standards.
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