Orban OPTIMOD-FM 8600Si, Operating Manual

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OPTIMOD-FM DIGITAL OPERATION
3-63
more of the source’s frequency balance, making the sound less dense and fatigu-
ing when the radio is played loudly.
The
S
PEECH
MB R
ELEASE control overrides the
MB R
ELEASE control when the
8600Si automatically detects speech (page 3-70). You may wish to set the
S
PEECH
MB R
ELEASE control faster for speech (to maximize smoothness and uniformity)
and slower on music (to prevent excessive build-up of density).
MB Gate Thresh (Threshold) control determines the lowest input level that will be
recognized as program by OPTIMOD-FM; lower levels are considered to be noise or
background sounds and cause the AGC or multiband compressor to gate, effectively
freezing gain to prevent noise breathing.
There are two independent gating circuits in the 8600Si. The first affects the AGC
and the second affects the multiband compressor
. Each has its own threshold con-
trol.
V2.0 software sets the multiband compressor’s gating threshold with respect to the
signal driving the multiband compressor/limiter, which follows the AGC. Meanwhile,
the AGC gating threshold remains set with respect to the AGC’s input, as it was in
V1.x software. Driving the MB gate detector after the AGC allows the AGC to do its
work of slowly correcting the drive level to later processing, including the multiband
MB Attack / Release
PC Remote Name Range
MB Release Slow, Slow2, Med, Med2, MFast, MFast2,
Fast
Speech MB Release Slow, Slow2, Med, Med2, MFast, MFast2,
Fast
B2 Attack 4 … 50 ms, Off
B3 Attack 4 … 50 ms, Off
B4 Attack 4 … 50 ms, Off
Speech B1 Attack 4 … 50 ms, Off
Speech B2 Attack 4 … 50 ms, Off
Speech B3 Attack 4 … 50 ms, Off
Speech B4 / 5 Attack 4 … 50 ms, Off
B1 Limiter Attack 0 … 100%
B2 Limiter Attack 0 … 100%
B3 Limiter Attack 0 … 100%
B4/5 Limiter Attack 0 … 100%
Lookahead In, Out, Auto
Speech Mode Speech, Music, Auto
Delta Release 1 –6 … 6
Delta Release 2 –6 … 6
Delta Release 3 –6 … 6
Delta Release 4 / 5 –6 … 6
Table 3-11: MB Attack / Release Controls