OPTIMOD-AM DIGITAL INTRODUCTION
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sound to your precise requirements and desires. OPTIMOD-AM also fully supports
the NRSC standard pre-emphasis curve.
OPTIMOD-AM is a stereo processor that fully protects CQUAM® transmissions,
conservatively complying with Motorola’s processing requirements that negative
peak modulation on the left and right channels be limited to –75% modulation.
OPTIMOD-AM supports the iBiquity HD Radio® system. Except for common
stereo enhancement and AGC, the HD AM processor is an independent process-
ing chain with its own set of user-adjustable parameters, maintaining 15 kHz au-
dio bandwidth (per iBiquity’s specifications) regardless of the bandwidth setting
of the processing intended for the analog channel. To ensure source-to-source
consistency, the digital radio processing includes full five-band compres-
sion/limiting that is independent of the five-band compression/limiting in the
analog processing chain. This output can also be used for netcasts.
Orban’s PreCode™ technology manipulates several aspects of the audio to
minimize artifacts caused by low bitrate codecs, ensuring consistent loudness and
texture from one source to the next. There are several HD factory presets tuned
specifically for low bitrate codecs. These presets have “LBR” in their names.
Controllable and Adjustable
The 9400 comes with a wide variety of factory presets to accommodate al-
most any user requirement. The user can readily modify these presets. Modified
presets can be stored and recalled on command. Advanced Control (accessible
from the PC Remote application) facilitates detailed sound design using the
same controls that were available to the factory programmers.
An LCD and full-time LED meters make setup, adjustment and programming
of OPTIMOD-AM easy — you can always see the metering while you’re adjusting
the processor. Navigation is by dedicated buttons, soft buttons (whose functions
are context-sensitive), and a large rotary knob. The LEDs show all metering func-
tions.
OPTIMOD-AM contains a versatile real-time clock, which allows automation of
various events (including recalling presets) at pre-programmed times.
A Bypass Test Mode can be invoked locally, by remote control (from either the
9400’s GPI port or the 9400 PC Remote application), or by automation to permit
broadcast system test and alignment or “proof of performance” tests.
OPTIMOD-AM contains a built-in line-up tone generator, facilitating quick
and accurate level setting in any system.
OPTIMOD-AM's software can be upgraded by running Orban-supplied
downloadable upgrade software on a PC. The upgrade can occur remotely
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