DMTH4
LECTROSONICS, INC.
30
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
threshold and time constant parameters. Also provided
is a limiter with adjustable threshold and time constant
parameter. The compressor and limiter implementa-
tions 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
Compressor
Parameters
Status LEDs
Limiter
Parameters
Output Channels
Amplitude
Response Graph
Gain Reduction
Meter
Output Channels
TEL
Status Indicators:
Compressor Active: glows yellow when the compressor for a particular output channel
becomes active.
Limiter Active: glows red when the limiter for a particular output channel becomes ac-
tive.
Compressor Parameters: The Compressor parameters are set by the following numeri-
cal controls. For any of these controls, there are two ways to change the value:
Click an up or down button next to the control
Type a value directly into the control and press ENTER
Threshold - The compressor input level threshold is displayed here and can be adjust-
ed from -80dBu to +20dBu.
Time Constant
- The compressor time constant is displayed here and can be adjusted
from 0.5 to 1000.0 ms.
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 DMTH4, changes
made in this tab take effect immediately. As always, the
changes are not permanent unless the DMTH4 settings
are stored to a preset in nonvolatile memory.
Out Comp/Lim Tab (Output Compressor/Limiter)
Name
Description