Labo
★
K
Effects –
www.labo-k-effects.com
–
6
Dynamics section
There are three modes of operation :
1)
Hard Limit « HL ». Limiter will not allow peaking value set above set ‘TRESH’
value. If the signal level exceeds the set value the gain of the circuit is reduced by
the control side chain so that the level of the ouput signal equals the threshold set
value.
Once the side
chain has been activated
,
the gain
is
restored
under the
control
of
the circuit time constants
.
The compression ratio
of the
Hard Limit
mode
is typically
greater
than 100:1.
2)
Soft Limit « SL ».
Module operates as
a compressor/limiter,
giving increasing
compre
s
sion with increasing signal over threshold
.
In this mode,
the compression
ratio gradually increases from 1.5:1 for an input
signal
amplitude equal to the
threshold set level, reaching 100:1
for
a signal
20dBs
above the threshold level.
3)
Noise Gate « GATE ». Module operates as a noise gate, reducing the noise floor
by 15dB.
In this mode the threshold is 50dB below that marked on the control.
Signals below the threshold level set the path gain to -25dB. If the signal then
increases a def
i
ned amount above the threshold the path gain reverts to OdB.
This built in hysteresis prevents the gate switching indecisively for marginal signal
levels
and
is approximately
lOdBs.
The GATE ON/OFF switching time constants
are
approximately
20mS
to prevent audible 'Fourier'
clicks.
4)
THRESH.
Sets the level at which the three circuit functions operate, with
modification explained
in point (3).
5)
« FAST » switch.
Pressing the button decreases
an
internal time
constant
by 10:1
.
This ratio is modified by the limiting mode selected
,
giving a resultant attack time
ratio
,
with
and
without
« FAST » selected, of 4 :1 with HARD LIMIT selected and
10 :1 with SOFT LIMIT selected. With both FAST and HARD LIMIT selected,
he
attack time is
250
㎲
.
6) « Arrow» switch.
Allows the control sidechain of the circuit to activate the
adjacent channel's DYNAMICS module
,
allowing 2 modules to be grouped
together
.
The circuit is designed so that the highest control voltage
of a group of
linked units controls the group
7)
IN.
When selected the dynamics module is operative
.
When deselected the
module may still activate the adjacent channel's control sidechain.
8)
Limiting LED.
This LED illuminates when there is a gain reduction through the
module of 3dB or more.
En Gate mode, Led lights off when the signal level is
above the set threshold and gate opens.
Signal presence / Overload indicator :
Signal indicator
is
full wave rectified and the peak value of the
input signal is stored. This
voltage is compared with the
voltage on the signal threshold input (set to 0dB by
default
)
and if greater the SIG LED is turned on. Attack time = 2mS and release time =
1. 5 S approx
.
