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With a soft knee, signals which only just exceed the threshold level are compressed at a low ratio, the ratio
increasing the higher the signal level.
sets the time the Compressor takes to respond once the threshold has been exceeded. Attack may be
set so that the initial transient of the instrument passes through unaltered, or set to a faster value so that the
very start of the sound is compressed. Particularly with drum sounds, careful adjustment of attack time can
make the sound more 'punchy' and 'driving'.
time plays a very important role in compression. During periods of high signal level, gain is reduced.
When the signal level falls below the threshold, the gain will increase at a rate determined by the Release
control. If the release time is short, the gain will rise quickly. A long release time will mean that the gain will
stay at its reduced level, only recovering gradually :
The setting of the correct release time is a compromise. If the release time is too short, background noise can
cause effects often known as 'breathing' and 'pumping'. If the release time is too long, the signal will not be
compressed, but simply reduced in level. For effective compression, the release time must be set to as short a
value as possible before modulation of the background noise becomes too noticeable. The gain reduction bar
graph meter will show how much actual compression is going on. If it stays steady, there is little active
compression, just a steady-state reduction in level. The faster the bar graph moves up and down, the harder
the Compressor is working.
For a natural unnoticeable compression, attack and release times may be set to Auto. The signal
characteristics are continuously monitored for optimum values.
Attack
Release
Diagram 4
Signal Envelope
Input signal
Fast release
Slow release
Содержание DN500 Plus
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