OPTIMOD 6300 DIGITAL
OPERATION
3-15
gain reduction in the AGC section when the structure is gated. (It gates whenever
the input level to the structure is below the user-adjustable threshold of gating.)
When a music preset is on the air, the L
ESS
-M
ORE
control sets the amount of overall
processing, making optimum tradeoffs between loudness, brightness, and distor-
tion. In sound for picture, there are no loudness wars; for music presets, there is
probably never a need to advance the L
ESS
-M
ORE
control beyond 5.
The stereo enhancer, AGC, equalizer, and look-ahead limiter are common to both 2-
band and 5-band processing and therefore stay the same when the 6300 switches
between 2-band and 5-band operation. However, different controls appear in the
screens containing dynamics processing controls, as appropriate for 2-band or 5-
band multiband compression. The meters also change functionality to display the 2-
band or 5-band gain reduction.
Both the 2-band and 5-band multiband compressors always operate in the back-
ground. Switching between 2-band and 5-band therefore occurs with a seamless
cross-fade. Unlike some older Orban processors, no DSP code gets reloaded and no
audio mute occurs, although switching can sound obtrusive if the loudness normally
produced by the 2-band and 5-band presets are very different. It is usually possible
to eliminate audibly obtrusive switching artifacts by tweaking one (or both) of the
presets to make them sound closer to each other and saving the results as user pre-
sets.
2-band:
The 2-band structure consists of a slow 2-band gated AGC (Automatic Gain
Control) for gain riding, followed by a gated 2-band compressor and a look-ahead
limiter. By choosing the crossover mode correctly, the 2-band Structure can be made
phase-linear throughout to maximize sonic transparency.
The 2-band structure has an open, easy-to-listen-to sound that is similar to the
source material if the source material is of good quality. However, if the spectral
balance between the bass and high frequency energy of the program material is in-
correct, the 2-band structure (when its
B2-B1
C
OUPLE
control is operated toward 0%)
can gently correct it without introducing obvious coloration.
In radio-oriented applications, the 2-band structure is mainly useful for classical or
“fine arts” programming that demands high fidelity to the original program source.
The
PROTECTION
preset is a 2-band preset that provides the highest fidelity; other
2-band presets provide more processing.
The 2-band structure preserves the frequency balance between midrange and high
frequency elements in the programming while permitting gentle automatic re-
equalization of the balance between these elements (in the “master” band, which is
above 200 Hz) and elements in the “bass” band (below 200 Hz).
The AGC and 2-band crossovers can be configured to be either phase-linear (i.e.,
constant-delay) or “allpass.” “Allpass” provides minimum time delay along with a
frequency response that is free from peaking or dipping when band gains are un-
equal. “Allpass” also helps make speech waveforms more symmetrical. The delay-
line derived phase-linear crossover has the same desirable smoothness in its fre-
Содержание OPTIMOD 6300
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