Klark Teknik DN500 Plus, Operator'S Manual

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20
l
abc Compression, Expansion and Limiting
The act of compressing a signal inevitably causes an increase in noise level. Compression reduces peak
levels; gain make up restores the overall level, and in the process increases the level of any background noise
that the signal contains.
Almost always, when compression is used, the Expander section of the DN500 Plus will be used also, to clean
up the signal. The Limiter/Clipper will control any unwanted peaks.
The result is three-stage dynamic control over gain with three different threshold levels:
In the mid-range of levels, the signal is unaltered. Above the compression threshold, in this example, gain is
reduced by a ratio of 2:1. Above the limiting threshold it is reduced by 25:1. At levels below the Expander
threshold, gain is reduced by 2:1. Complete control over signal dynamics is possible.
Diagram 7
+20
+20
-10
-10
+10
+10 -20
-20
Output
le
v
e
l
(dB)
Input level (dB)
Limiter Threshold
Compressor Threshold
Expander Threshold