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OPTIMOD-PC
Further, be aware of the different peak factors on voice and music—if voice and mu-
sic are peaked identically on a VU meter, voice may cause up to 10 dB more peak
gain reduction than does music! (A PPM will indicate relative peak levels much more
accurately.)
The AGC meter can be switched (within the Full Control screens) so that it either
reads the gain reduction of the Master (above-200 Hz) band, or the difference be-
tween the gain reduction in the Master and Bass bands.
The latter reading is useful for assessing the dynamic bass equalization
that the AGC produces and it helps you set the AGC BASS COUPLING con-
trol.
Fundamental Requirements:
High-Quality Source Material and Accurate Monitoring
A major potential cause of distortion is excess peak limiting. Another cause is poor-
quality source material, including the effects of your playback machines, electronics,
and studio-to-transmitter link (if any). If the source material is distorted even slight-
ly, that distortion can be exaggerated by OPTIMOD-PC—particularly if a large
amount of gain reduction is used. Very clean audio can be processed harder without
producing objectionable distortion.
A high-quality monitor system is essential. To modify your sound effectively, you
must be able to hear the results of your adjustments. In too many facilities, the best
monitor is significantly inferior to the sound systems found in many listeners'
homes!
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
but you do not need to understand it to get excellent sound from OPTIMOD-PC. We
have carefully designed OPTIMOD-PC's factory presets and most users will not need
to go beyond these.
In OPTIMOD-PC, a processing structure is a program that operates as a complete au-
dio processing 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 com-
ponents (like equalizers, compressors, limiters, and clippers), OPTIMOD-PC's DSP
hardware realizes two processing structures that run simultaneously, permitting
graceful switching between them. Unlike an analog system, where creating a com-
plete processing system involves physically wiring its various components together,
OPTIMOD-PC realizes its processing structures as a series of high-speed mathematical
computations made by Digital Signal Processing (DSP) integrated circuit chips.
There are two basic structures: Two-Band and Five-Band, both of which are phase-
linear. To select a structure, choose a factory preset having the desired structure,
-M
, you may still find the material interesting
ESS
ORE
3-21
OPERATION
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