Orban - OPTIMOD-FM 8500 - Effect Processor
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Equipment:
OPTIMOD-FM 8500
Date:
2011
Category:
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Information
The
OPTIMOD-FM 8500 Digital Audio Processor
Orban’s all-digital 8500 OPTIMOD-FM Audio Processor can help
you achieve the highest audio quality in FM stereo
broadcasting. Because all processing is performed
by high-speed mathematical calculations within Motorola
DSP56367 24-bit digital signal processing chips, the
processing has cleanliness, quality, and stability over time
and temperature that is unmatched by analog processors.
OPTIMOD-FM 8500 is descended from the industry-standard
OPTIMOD-FM audio processors. Thousands of these processors
are on the air all over the world. They have proven that the
“OPTIMOD sound” attracts and keeps an audience even in the
most competitive commercial environment.
Because OPTIMOD-FM incorporates several audio processing
innovations exclusive to
Orban products, you should not
assume that it can be operated in the same way as less
sophisticated processors. If you do, you may get
disappointing results.
Take a little time now to familiarize yourself with
OPTIMOD-FM. A small investment of your time now will yield
large dividends in audio quality. The rest of Section 1
explains how OPTIMOD-FM fits into the FM broadcast facility.
Section 2 explains how to install it. Section 3 tells how to
operate OPTIMOD-FM.
Section 4 through Section 6 provides reference information.
OPTIMOD-FM was designed to deliver a high quality sound
while simultaneously increasing the average modulation of
the channel substantially beyond that achievable by
“recording studio”-style compressors and limiters. Because
such processing can exaggerate flaws in the source material,
it is very important that the source audio be as clean as
possible.
For best results, feed OPTIMOD-FM unprocessed audio. No
other audio processing is necessary or desirable.
If you wish to place level protection prior to your studio /
transmitter link (STL), use the
Orban Optimod 6300 or
Optimod-PC 1101. These processors can be adjusted so
that they substitute for the AGC circuitry in OPTIMOD-FM,
which is then defeated.
OPTIMOD-FM 8500 is available in two front-panel
configurations—the 8500 has a full-featured front panel,
while the 8500X has a blank front panel and must be con-
trolled by Orban’s PC Remote application running on
Microsoft Windows XP, 2000 (SP3), or later. Both units have
identical sound and features except for the difference
in their front panels. Both units run the same software.
If you are setting up an “X” version, refer to Administering
the 8500 through its Serial Ports or Ethernet (starting on
page 2-43) for instructions on how to use the 8500X’s serial
port #2 to set up communications between your computer and
the 8500X.
Both the 8500 and 8500X simultaneously process for analog FM
and digital channels like the iBiquityTM HD RadioTM system,
Eureka 147 (DAB), DRM, or netcasts. The 8500’s HD output
provides look-ahead peak limiting that is optimized to make
the most of limited bit-rate codecs used in many digital
radio systems. By eschewing any clipping, the HD output
prevents the codec from wasting precious bits encoding
clipping distortion products, allowing the codec to use its
entire bit budget to encode the desired program material.
Thanks to a base sample rate of 64 kHz throughout the 8500’s
processing, the HD output can be set for audio bandwidths
between 15 and 20 kHz. Many codecs operate better when fed
15 kHz audio because this enables them to use their
available bit bandwidth most efficiently by concentrating on
the part of the audio spectrum that is critical to perceived
audio quality. This is particularly true for low rates, like
32 kbps. However, at higher sample rates, full 20 kHz
bandwidth provides the same bandwidth as typical source
material, so you may prefer to use it for rates of 96 kbps
and above.
Service and user manual
Manual type:
Service and user manual
Pages:
350
Size:
6.4 MB
Language:
english
Revision:
Manual-ID:
96123.300.00
Date:
May 2011
Quality:
Electronic document, no scan, very well readable.
Upload date:
Oct. 31, 2017
MD5:
c2d37b76-912f-7aad-cdda-159580ec36fd
Downloads:
505