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Technical information regarding the De-Esser
In contrast to common de-essers that influence a frequency band of about
2 octaves with compressor techniques the Auto-Dynamic De-Esser utilizes
filters that process only the reducible ”S-frequencies” but do not interfere
with the remainder of the spectrum. The S-frequencies that lie in the unple-
asant range are automatically recognized, the phase is inverted and mixed
with the original signal. In this manner the disturbing frequency is quenched
and the hissing noise reduced. This method of operation has distinct advan-
tages because it is unobtrusive and helps retain the original tonal quality.
Compressor-typical side effects such as lisping or nasal tones do not occur.
Finally its operation is as simple as pulling on the hand brake.
The reduction is accomplished by comparing the entire level with the indivi-
dual S-sounds: the De-Esser functions only when the S-noise level exceeds the
average level of the entire frequency spectrum. This means for example that
original S-sounds with a determinate S-portion are not processed whereas
those that are too loud, or do not effectively contrib ute to the sound, are
reduced – the character of the voice remains unchanged.
A further specialty is the integrated auto-threshold-function which makes
processing independent of the input level. Even when the speaker or singer
does not maintain a constant distance to the microphone, processing is reta-
ined at the pre-set S-reduction value. Conventional systems are dependent on
the input level and work more intensively as the distance to the microphone is
reduced.
On
The On button activates the Compressor/Limiter module. At the same time
the Gain Reduction display shows the processing intensity (see section ”Gain
Reduction” on page 16).
Limiter
The Limit button switches the Compressor to limiter mode. The Compression
control serves the purpose of controlling the threshold. The Limiter does not
function as a peak limiter, in other words there is no guarantee that all peaks
are intercepted. It is therefore advisable when modulating a subsequent unit
that a headroom of 2 to 4 dB remains. Peak limiters have a system-b ased
disadvantage in that audible distortions are heard considerably sooner, which
De-Esser
Control Elements
Compressor/Limiter
Control Elements
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info
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