BSS Audio DPR-402 Owner's Manual - Manual (Page 26)

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Fig 12.1b DE-ESS
Controls
In utilising the controls in figure 12.1b, no other compressor controls will be
required. If no compression is being used, the ratio or threshold controls should
be set to OUT. The frequency control should be set to coincide with the
lowest frequency of the sibilance, and the de-ess control be used to give the
required amount of gain reduction. The maximum amount of reduction
available in this mode is 20dB. The dynamic settings for this compression are
set automatically by the unit, and are optimised for general vocal work.
The green and orange LEDs above the de-ess control provide a simple
indication of the degree of de-essing, with the green LED indicating the start
of the operation and the orange LED indicating approximately 15dB of gain
reduction.
Having only a frequency and level control for this broadband de-essing
function provides a very simple and effective way of treating general sibilant
vocal signals, when processed on their own.
Should the need for more comprehensive control of the de-essing function
arise, then the main compressor section can be configured to operate as a
dedicated de-esser by operating the mode switch (See figure 12.1b). The
amount of gain reduction can then be extended down to 30dB if required, and
this gives full control over the dynamic settings, as in normal compression
(refer to section 14.1).
12.3 HF Only
De-essing and
Controls
To achieve this mode of operation, the main compressor must be utilised as an
exclusive de-esser by operation of the MODE switch to DE-ESS HF (See figure
12.2).
Gain reduction at high frequencies only is achieved by inserting an internal
high pass filter into the subtract side chain so that only these high frequencies
are available to the subtractor. The front panel FREQ control adjusts both this
filter and the control side chain filter simultaneously, to provide a de-essing
range from 700Hz to 20kHz. HF only de-essing is achieved by operating the
compressor controls as for normal compression (refer to section 10), and
utilising the FREQ control to allow only the sibilant frequencies to cause gain
reduction. If general compression is required simultaneously, then channel 2
of the unit can be used by connecting the two channels in series. It should be
remembered that in this mode, the DE-ESS and PEAK LIM controls must be set
to OUT, as they cannot be used simultaneously with the compressor switched
to dedicated de-ess mode.
Fig 12.2 HF DE-ESS
Controls
De-essing and Peak Limiting