6. APPLICATION NOTES
34
In dynamic mode the filter activity is controlled by the audio
level. The filter get active only if the level of incoming audio
signal reaches a defined threshold level. A typical application for
a dynamic equaliser is the de-esser function.
There are two basic modes for the dynamic equaliser,
dependent on adjusted RANGE value.
Negative values for RANGE (cut function) switches into
REDUCE mode. In REDUCE mode signals will be reduced if
their level is higher as the threshold level.
All spectral parts of the signal (filtered by the filter band) which
has more level as the adjusted threshold level will be reduced by
the RANGE value. The level reduction never comes below the
threshold level.
threshold
REDUCE MODE
RANGE value negative (cut)
frequency
level
Positive values for RANGE (boost function) switches into
ENHANCE mode. In ENHANCE mode signals will be increased
(or enhanced) if their level is below the threshold level.
All spectral parts of the signal (filtered by the filter band) which
has less level as the adjusted threshold level will be increased
by the RANGE value. The increased level never comes over the
threshold level.
ENHANCE MODE
RANGE value positive (boost)
threshold
frequency
level
6.2
DYNAMIC
EQUALISER
