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INTRODUCTION
ORBAN MODEL 1101
•
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 may also help low bitrate lossy codecs
sound better than they do when fed full 20 kHz bandwidth audio.) 10 kHz
bandwidth meets the requirements of auxiliary DAB transmissions using a 24
kHz sample frequency.
•
Freescale DSPs
do all the audio processing—there is no extra DSP load on your
computer’s CPU.
•
Full
coprocessing
(independent of the host computer’s CPU) means that audio
will ordinarily continue to pass through the card from its hardware inputs to its
hardware outputs even if the host computer crashes. (Of course, Wave inputs
and outputs will stop working because these are dependent on operating system
services.)
•
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.
•
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.)
•
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
•
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
its processing structures as a series of high-speed mathematical computations
made by Digital Signal Processing (DSP) chips.
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