ALCATECH BPM STUDIO 4 PRO User Manual page 44

Threshold
(Adjustment level –60 to 0 dB)
This parameter defines the trigger level of the
control. Soft passages or silence at the beginning
and end of a title will not be changed to avoid
negative impact on a titles total dynamic. This
also prevents unwanted increasing and amplifying
of unwanted background noise.
Target
(Adjustment level –21 to -3 dB)
This is the predefined target output level. AGC
will try to raise or lower every level that is louder
or quieter than the threshold level.
Scope
(Adjustment level 0 to 21 dB)
This value defines the max. amplification or
diminution, thus defining the intensity of the
control. If, for example, a peak level exceeds more
than the scope value over the target, it will only
be decreased by the max. Scope value.
Attack
(Adjustment level from 1 to 500ms)
With this parameter the latency of this control can
be adjusted. Peak levels lasting shorter than this
value, will not be recognized by the AGC.
Release
(Adjustment level 1 to 500ms)
This parameter defines how long it takes for the
intervention to abate res. how long it takes to go
back to regular output level.
The Limiter also allows to restrict very
short peak levels, which the AGC would
not address, since the AGC response time
is way shor ter than the duration of
exposure it would take to overmodulate,
or even damage equipment.
Limiter
(Adjustment level –18 to 0 dB)
The limiter restricts levels at very short reaction
time. It's purpose is to restrict the signal level, to
protect devices in the following signal course like
external mixers, cross overs, output stages, and
speakers from over modulation and overloading.
Below it's predefined trigger level it stays inactive.
Input / Output
(Adjustment level –12 to 12 dB)
These two controls allow a linear adjustment of
input and output signal. The displayed bars
represent signal level before and after the change.
Displays within the AGC Module
The display within the AGC modules consists of
the compressor display (left), and the limiter
display (right). If the amplification indicator is
positioned in the center, the signal
loops through the AGC module
without modification. If the indicator
travels below the zero level, the input
signal is too strong, and is weakened
by the module in accordance with
predefined parameters. Vice Versa,
the signal will be amplified, if the
indicator travels above the zero level.
The red bar in the top right hand
corner indicates the trigger level of
the limiter. The peak level at the
AGC's signal output is marked in
yellow. As long as this marker moves
below the red area, no modifications
will be applied. Should this marker touch the red
area, the signal will rapidly be lowered to the
defined maximum peak level.
The AGC only works in the auto fade
mode. Even if the AGC is active, it will not
be of any effect if auto fade is not active.
AGC