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OPTIMOD-PC
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OPTIMOD-PC controls the audio bandwidth as necessary to accommodate the
transmitted sample frequency, obviating the need for extra, overshooting anti-
aliasing filters in downstream equipment. OPTIMOD-PC's high frequency band-
width can be switched instantly (typically in 1 kHz increments) between 10.0 kHz
and 20 kHz. 20 kHz is used for highest-quality systems. 15 kHz meets the re-
quirements of the iBiquity® HD-AM system that use 44.1 kHz system input sam-
ple frequency. (15 kHz codec bandwidth and may also help low bitrate lossy co-
decs sound better than they do when fed full 20 kHz bandwidth audio.) 10 kHz
bandwidth meets the requirements of auxiliary Eureka-147 transmissions using a
24 kHz sample frequency.
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Three Motorola DSPs do all the audio processing—there is no extra DSP load
on your computer's CPU.
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Full coprocessing (independent of the CPU) means that audio will ordinarily
continue to pass through the card from its hardware inputs to its hardware out-
puts even if the host computer crashes. (Of course, WAVE inputs and outputs
will stop working because these are dependent on operating system services.)
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OPTIMOD-PC ships with over twenty standard presets, which correspond to
different programming formats. These presets have already been tested and
field-proven in major-market radio netcasting, digital radio, and direct satellite
broadcasting applications (both radio and television) worldwide. There are also
special-purpose presets for studio AGC, pure peak limiting, and low bitrate en-
coding applications.
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An easy-to-use graphic control application runs on your PC and can act as a
client to control any number of OPTIMOD-PC cards, either locally or in other PCs
on your network via TCP/IP addressing. Other Orban software offers a server
function, allowing other computers on your network to address cards located in
your PC. (This server software is installed automatically as part of the OPTIMOD-
PC installation process and runs as a Windows service.)
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The Control application allows you complete flexibility to create your own cus-
tom presets, to save as many as you want to your local hard drive, and to recall
them at will.
Adaptability through Multiple Audio Processing
Structures
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A processing structure is a program that operates as a complete audio proc-
essing system. Only one processing structure can be active at a time. Just as there
are many possible ways of configuring a processing system using analog compo-
nents (such as equalizers, compressors, limiters, and clippers), there are many
possible processing structures achievable by OPTIMOD-PC. OPTIMOD-PC realizes
1-9
INTRODUCTION
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