Out Comp/Lim (Output Compressor/Limiter) Tab - Lectrosonics DM84 Reference Manual

DM84 Digital Matrix Processor

Out Comp/Lim (Output Compressor/Limiter) Tab

This tab controls a high quality compressor that can be
set up to control the dynamics of an output signal. The
compressor is a "soft" knee type with adjustable thresh-
old and time constant parameters. Also provided is a
limiter with adjustable threshold and time constant
parameter. The compressor and limiter implementations
are based on an RMS level detector controlled by a
single time constant parameter. This is an adaptive
design which responds to varying rates of change in the
signal level by dynamically adjusting the attack and
release times for best performance
Status LEDs
Compressor
Parameters
Limiter
Parameters
Gain Reduction
Meter
Output Channels
Name
Compressor setup
34
Description
Compressor parameters are set by the following numerical controls:
• Threshold - The compressor input level threshold is displayed here and can be adjusted
from -80dBu to +20dBu.
• Time Constant - The compressor time constant is displayed here and can be adjusted from
0.5 to 1000.0 ms.
• Ratio - The compression ratio is displayed here and can be adjusted from 1:1 (displayed as
"Off") to 50:1 (displayed as "INF:1").
• Makeup Gain - The makeup gain value is displayed here and can be adjusted from 0dB to a
limit which is a function of the threshold and compression ratio. The makeup gain value
automatically responds to changes to the compression ratio so that it never exceeds the
limit set by the rule:
maximum makeup gain = gain reduction at full scale input
where the gain reduction at full scale input (+20dBu) depends on the threshold and
compression ratio selected.
Compressor setup parameters for one output channel can be copied and pasted into another
output channel.
It is important to note that signals are processed first by
the compressor (where any makeup gain is added),
then by the limiter.
The tab contains a notebook of output compressor
settings, with a separate page for each output channel.
If the computer is connected to a DM84, changes made
in this tab take effect immediately. As always, the
changes are not permanent unless the DM84 settings
are stored to a preset in nonvolatile memory.
Amplitude
Response Graph
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