Dynamic Signal Processing; Noise Gate; Compressor; Defining The Control Signal: Side Chain - IMG STAGELINE DELTA-160 Bedienungsanleitung

– "Apply" is used to balance the setting of the equalizer after a
measurement performed via "Measure"
Example: After measuring a level of −6 dB in the 400 Hz band, the control for
these frequencies will be set to +6 dB�
A message will appear advising you to turn back the volume of the
sum channel as a precaution� Tap "OK" to confirm the message
or "Cancel"�
Note: Frequencies below 40 Hz and above 16 kHz will not be corrected auto-
matically; any corrections must be made manually�
– "Save" is used to save the determined equalizer settings for later
use ( ☞ chapter 5�3�3�1)�

5.4 Dynamic signal processing

A noise gate and a signal compressor are available for each analog
input channel� For the mono channels, they can also be controlled via
another signal (Side Chain)�
To adjust the compressor or noise gate, tap the miniature dynamic
curves underneath "GATE /COMP" in the channel strip of an input
channel� The view for dynamic signal processing will be displayed
(fig� 19)�
Mic IN
GEQ 2
CH1
Side Chain
48V REV HPF
EQ
Gate
Threshold
OUT
0
−54.0dBu
GATE COMP
−40
Bus 1
−80
Bus 6 50|50
Attack Release Hold
70.0 ms 400.0 ms 500.0 ms
CH 1
PAN
-1 dB
50/50
L&R
Library my_Dyn
SOLO
MUTE
Fig. 19 Dynamic signal processing

5.4.1 Noise gate

A noise gate will only let a signal pass when the signal level has
exceeded an adjustable threshold value� Signals with levels below this
threshold will be attenuated so that they cannot be heard or only be
heard at a lower volume� This is useful, for example, to suppress the
noise floor of a signal source or crosstalk of other instruments when
sound is picked up with microphones�
1) To activate the gate, tap the button "IN" on the right of "Gate"�
The button will be blue and the small square above the miniature
curve of the channel strip will be yellow�
2) Tap the corresponding fader displayed on the screen to select the
parameter to be adjusted:
– Threshold threshold value; the gate will open when this value
is exceeded
– Attack attack time
– Release release time; during this time, the attenuation will
rise to the attenuation value "Depth" when the
signal level has fallen below the threshold and the
hold time "Hold" is elapsed
– Hold hold time; during this time, the gate will remain
open after the signal level has fallen below the
threshold value before the release time starts
– Depth attenuation value (indicated as negative gain) for
signal parts with levels below the "Threshold"
value
3) Use the control knob ADJUST (6) to make the setting�
CH1, Pre-EQ
IN

Compressor

Depth Threshold
OUT
0 dB 0
−47.0 dBu
−20
−40
−40
−80
−80
Depth Attack Release Gain
−28.5 dB 25.0 ms 350.0 ms 0.0 dB
Save Bypass
4) To deactivate the noise gate, tap the button "IN" once again�
The bar graph "Depth" on the right of the curve representation indi-
cates the current attenuation (negative gain) of the signal�
Note: If the gate fails to respond in accordance with the settings, make sure
that the correct control signal (Side Chain) has been selected (
5.4.2 Compressor
The compressor will attenuate the level above an adjustable threshold
to reduce the dynamic range of the signal� Thus, level differences (e� g�
due to varying distances to the microphone) or signal peaks can be
attenuated in order to allow a higher gain setting and consequently
to obtain a higher average volume�
The compressor can also be used as a level limiter: With a com-
pression ratio set to the maximum value (ratio = 20 :1), the threshold
value will define the level not to be exceeded�
1) To activate the compressor, tap the button "IN" on the right of
"Compressor"� The button will be blue and the small square above
the miniature curve of the channel strip will be yellow�
2) Tap the corresponding fader displayed on the screen to select the
parameter to be adjusted:
X
– Threshold
IN
Reduction
– Attack
0dB
– Release
20
40
80
– Gain
Ratio
3.5
– Ratio
3) Use the control knob ADJUST (6) to make the setting�
4) To deactivate the compressor, tap the button "IN" once again�
The bar graph "Reduction" on the right of the curve representation
indicates the current gain reduction�
Note: If the compressor fails to respond in accordance with the settings, make sure
that the correct control signal (Side Chain) has been selected (

5.4.3 Defining the control signal: Side Chain

For the mono channels, it can be defined which signal is to be used
as a control signal for the gate and for the compressor� The default
setting is the one used most frequently, i� e� the signal of the channel
is controlled by its own level course: The signal is picked up ahead of
the parametric equalizer so that the equalizer settings will not have
any effect on dynamic processing� The signal can, however, also be
picked up after the equalizer if required�
Alternatively, the signal of any other mono input channel can
be selected as a control signal either ahead of (Pre) or after (Post) its
equalizer� This will allow you, for example by means of the compres-
sor, to produce ducking effects that can be used to improve speech
intelligibility of announcements� The compressor is used to attenuate
the signal of a channel while the channel selected as Side Chain is
used for talking (Talkover)�
Special effects can be produced with the gate by Side Chain,
e� g� triggering an instrument (e� g� bass) via the signal of a percussion
instrument (e� g� bass drum)�
To change the control signal:
1) Tap  next to the field "Side Chain"� The list of the input channel
signals will be displayed�
2) Tap the corresponding control signal�
threshold value; the gain will be reduced when the
signal level exceeds this value
attack time
release time; time the gain takes to reach its original
value after the signal level has fallen below the
threshold value
gain to balance the volume loss caused by com-
pression
compression ratio (1:1 = no compression,
10 :1 = high compression, 20 :1 = level limiting)
☞ chapter 5�4�3)�
☞ chapter 5�4�3)�
37