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3-45
OPTIMOD-PC
OPERATION
2B Bass Threshold determines the compression threshold of the bass band (below
200 Hz) in the Two-Band Compressor. It can be used to set the target spectral bal-
ance of the Two-Band Compressor.
As the Two-Band Compressor
control is moved towards "100%," the 2B
B
C
ASS
PL
control affects the sound less and less.
B
T
ASS
HRESHOLD
2B Master Attack sets the attack time of the Two-Band Compressor master com-
pressor (above 200Hz).
2B Bass Attack sets the attack time of the Two-Band Compressor bass compressor
(below 200Hz).
2B Crossover sets the structure of the two-band crossover to Allpass or Linear. See
AGC C
on page 3-37 for more detail about these modes.
ROSSOVER
The Five-Band Structure
The Five-Band structure consists of a stereo enhancer, a slow gain-riding two-band
AGC, an equalization section, a five-band compressor, a dynamic single-ended noise
reduction system, an output mixer (for the five bands), and a low-IM look-ahead
limiter.
Unlike the Two-Band structure, whose two-band compressor has a continuously
variable release time, the release time of the Five-Band compressor is switchable to
seven increments between slow and fast. Each setting makes a significant difference
in the overall flavor and quality of the sound.
When the input is noisy, you can sometimes reduce the noise by activating the sin-
gle-ended noise reduction system. Functionally, the single-ended noise reduction
system combines a broadband downward expander with a program-dependent low-
pass filter. This noise reduction can be valuable in reducing audible hiss, rumble, or
ambient studio noise. We use it for the news and sports factory presets.
The Five-Band structure does not have a separate Loudness Controller because its
Five-Band compressor automatically re-equalizes the spectral balance of various
pieces of program material in a way that tends to make their loudness more consis-
tent.
Putting the Five-Band Structure on the Air
The Five-Band structure is very flexible, enabling you to fine-tune your sound for
your target audience and desired market position. There are several basic Factory
Presets for the Five-Band structure. Each of these presets can be edited with the
control. This control affects the video-oriented presets differently than it
L
-M
ESS
ORE
does the music presets (presets with "music" in their names). When a video-oriented
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