Orban OPTIMOD-FM 8700, Operating Manual

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OPTIMOD-FM DIGITAL OPERATION
3-21
B) L
OCATE
to S
YSTEM
S
ETUP
> M
EMORY
icon and then press the E
NTER
button.
C)
Locate
to highlight the user preset you wish to delete.
Factory presets cannot be deleted.
D) L
OCATE
to D
ELETE
and then press the E
NTER
button to delete the highlighted
preset.
E) Repeat steps (C) and (D) until you are finished deleting presets.
F) When you have finished deleting user presets,
L
OCATE
to
D
ONE
and press the
E
NTER
button.
About the Processing Structures
If you want to create your own User Presets, the following detailed discussion of the
processing structures is important to understand. If you only use Factory Presets or if
you only modify them with
L
ESS
-M
ORE
, then you may still find the material interest-
ing, but it is not necessary to understand it to get excellent sound from the 8700i.
In the 8700i, a processing structure is a program that operates as a complete audio
processing system. Only one processing structure can be on-air at a time. Just as
there are many possible ways of configuring a processing system using analog com-
ponents (like equalizers, compressors, limiters, and clippers), 8700i’s DSP hardware
can realize several possible processing structures. Unlike an analog system, where
creating a complete processing system involves physically wiring its various compo-
nents together, the 8700i realizes its processing structures as a series of high-speed
mathematical computations made by Digital Signal Processing (DSP) integrated cir-
cuit chips. In the 8700i, both structures operate simultaneously so there is no delay
in switching between them, which is done with a smooth cross-fade.
There are three basic structures: Two-Band, Five-Band, and Ultra-Low latency Five-
Band. To select a structure, choose a factory preset having the desired structure, and,
if you wish, edit it to create a user preset.
Two-Band is a versatile structure that can be configured to provide purist, phase-
linear processing. When correctly configured it can be used for protection limiting
and we provide two presets that use it for this. It is also used for the
CLASSICAL-2
BAND presets.
Five-Band is the basic structure used for popular music in its many variations. Be-
cause it provides effective automatic re-equalization of program material, it is also
used for news, talk, and sports.
The stereo enhancer, AGC, equalizer, and “back end” clippers are common to both
Two-Band and Five-Band processing and therefore stay the same when the 8700i
switches between two-band and five-band operation. However, different controls
appear in the screens containing dynamics processing controls, as appropriate for
Two-Band or Five-Band multiband compression. The meters also change functionali-
ty to display the Two-Band or Five-Band gain reduction.