Orban OPTIMOD-PC 1100, Руководство по эксплуатации

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OPTIMOD-PC INTRODUCTION
1-7
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 circuitry in
OPTIMOD-PC, which is then defeated. Other types of AGC systems may adversely
affect the audio.
General Features
•
Orban Optimod-FM® 8500HD-class digital audio processing on a PCI sound
card—pre-processes audio for consistency and loudness before it is transmitted
or recorded.
•
Applications include netcasting, HD Radio® (both primary and secondary digi-
tal channels), Eureka i47 and other dedicated digital radio services, FMExtra™
and other digital subcarriers, mastering, audio production, and many others.
•
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. PreCode includes special audio band
detection algorithms that are energy and spectrum aware. This can improve co-
dec performance on some codecs by reducing audio processing induced codec
artifacts, even with program material that has been preprocessed by other proc-
essing than Optimod.
•
While primarily oriented toward “flat” media , Optimod-PC can also provide
preemphasis limiting for the two standard preemphasis curves of 50
µ
s and
75
µ
s. This allows it to protect preemphasized satellite uplinks and similar chan-
nels where protection limiting or light processing is required.
Because its processing topology is most effective with “flat media,” Op-
timod-PC cannot provide extreme loudness for preemphasized radio
channels. Use one of Orban’s Optimod-FM processors for this application.
For analog television with FM aural carrier(s), use Optimod-TV 8382.
•
Two-Band automatic gain control with window gating and selectable L/R or
sum/difference processing compensates for widely varying input levels.
•
Shelving bass equalizer and three-band parametric equalizer let you color
the audio to your exact requirements.
•
Low-IM look-ahead limiter effectively limits peaks while ensuring that low-
bit-rate codecs operate optimally without overload.
•
Optimod-PC’s dual-mono architecture allows entirely separate mono programs
to be processed in 5-band mode, facilitating dual-language operation.