Omnitronic SMP-152 Mode D'emploi page 20

COMPRESSOR / LIMITER SECTION
The task of Compressors and Limiters is to reduce the dynamic range of the program material and to controll
the overall level. It prevents signals from exceeding a given threshold level. The extent of the resulting
dynamic level is dependent on Threshold, Attack, Release and Ration settings.
8. FREQ Control 1 & 2
Adjust a frequency between 20 and 2 K.
9. Q (Quality) Control
Adjust the bandwidth (Q-factor) between 30 and 3 Q.
10. FX 10 Button 1 & 2
Press this button to multiply the FREQ frequency range with the factor 10.
11. LEVEL Control
To adjust the output level. If a frequency range is highly boosted, the output level needs to be reduced via
the level-control in order to avoid amplifier distorsion.
12. THRESHOLD Control
The Threshold control sets the threshold point for the Compressor section. It has a range of –40 to +20 dB.
13. RATIO Control
This control determins the ratio between the input and output level for all signals exceeding the threshold
point by more than 10 dB. The control range can be adjusted form 1:1 to :1. A setting of 1:1 leads to no
∞
compression, turning the control clockwise makes the sound increasingly dense. A setting of :1
∞
corresponds to a limiter setting.
FIGURE A explains the comparison of compressed signals responding to various Ratio settings.
14. ATTACK Control
This control detemines the rate by which the compressor responds to the signal which exceeds the
threshold. This control can be adjusted from 0.1 ms to 100 ms. Use short Attack times for percussion and
slower times soft inaudible compression.
15. RELEASE Control
This control determines the rate that the compressor returns to unity again after falling below the threshold
level. This control can be adjusted from 0.1 to 2.5 seconds. Use short times for fast recovery and maximum
output and use longer times to avoid pumping.
The following diagram shows how the ATTACK/RELEASE works. Different time settings will create different
effects
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