OPTIMOD-PC INTRODUCTION
1-11
For best results,
feed OPTIMOD-PC unprocessed audio.
No other audio processing
is necessary or desirable.
In digital radio applications, if you wish to place level protection prior to your stu-
dio/transmitter link (STL), use an Orban studio AGC like the Orban 8200ST. The
8200ST can be adjusted so that it substitutes for the broadband AGC function in
OPTIMOD-PC, which is then defeated. Other types of AGC systems may adversely
affect the audio.
General Features
•
Optimod-quality digital audio processing
on a PCI sound card—pre-
processes audio for consistency and loudness before it is transmitted or re-
corded.
•
Functions as
two independent sound devices
. (Note that there is only one
audio processing chain; only input routing, output routing, and mixing functions
are duplicated.)
•
Available in two versions
:
1101
for
PCI
sockets and
1101e
for
PCIe
(PCI Ex-
press) sockets.
•
Applications
include netcasting, HD Radio® (both primary and secondary digi-
tal channels), DAB and other dedicated digital radio services, FMExtra™ and
other digital subcarriers, mastering, audio production, and many others.
•
Supplied
WAVE drivers
allow OPTIMOD-PC’s processed output to pass through
the PCI bus to the CPU, driving standard PC applications like Orban’s Opticodec-
PC MPEG-4 HE-AAC, Microsoft, or Real streaming encoders. OPTIMOD-PC’s audio
driver allows it to appear as
two sound devices
to the computer’s operating
system. The driver (with the aid of concurrently running third-party software) al-
so allows OPTIMOD-PC to receive
audio over IP
from the host computer’s net-
work connection. Drivers are available for
32 and 64-bit Windows XP
,
32 and
64-bit Windows Vista, and 32 and 64-bit Windows 7
.
•
Orban’s
PreCode
™ technology manipulates several aspects of the audio to min-
imize artifacts caused by low bitrate codecs, ensuring consistent loudness and
texture from one source to the next. PreCode includes special audio band detec-
tion algorithms that are energy and spectrum aware. This can improve codec
performance on some codecs by reducing audio processing induced codec arti-
facts, even with program material that has been preprocessed by other process-
ing than Optimod.
•
While
primarily oriented toward “flat” media
, OPTIMOD-PC can also pro-
vide
preemphasis limiting
for the two standard preemphasis curves of 50
μ
s
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