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Applications: De-essing
De-essing is an important compression technique using the Side Chain. Many singers have high level
sibilants 'sss' sounds which detract from their performance. Equalising the signal will reduce the sibilants,
but also make the overall vocal sound dull.
The sibilants can be selectively removed by compressing only when there is an excessive level of high
frequencies. Here is one way to do it :
The microphone channel is routed to a group with the Compressor patched into the group insert points. The
microphone channel is also parallelled into another channel via the line input. The signal in the second
channel is equalised so that high frequencies in the sibilant range are boosted. This channel is fed via an
auxiliary output to the Compressor Side Chain input.
Now, the Compressor will react whenever there is a sibilant, reducing the gain for the duration of the sibilant
and cleaning up the vocal sound.
This technique can also be used to compensate for a 'boomy' bass, or other situations where a band of
frequencies is occasionally obtrusive.
The DN500 Plus Dual Compressor/Limiter/Expander offers a unique combination of dynamic gain control
processors. Engineers will find it a powerful tool in recording, broadcast and post-production studios, and in
sound reinforcement systems.
Diagram 10
Mic Input
(Channel routed
to group)
Send
Insert Send
(channel 1)
Line In
(channel 2)
Aux Send
Return
Input
Compressor side
chain input
Output