In Filters (Input Filters) Tab - Lectrosonics DM84 Reference Manual

DM84 Digital Matrix Processor

In Filters (Input Filters) Tab

This tab contains a notebook of the six available input
filter settings, with a separate page for each input
channel. If connected to a DM84, changes made in this
Filter Set
Notebook
Filter Type
Filter Number
ADFE Filter
Control
Name
Filter set notebook
Freq. response graph
Graph scale
ADFE filter control group The ADFE (Automatic Digital Feedback Elimination) controls and indicators are used to manage the
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Description
Each input channel has a set of 6 filters that can be used as needed. These are contained within the
Filter set notebook, with one page per filter. The tabs along the bottom of the notebook are used to
select one of the six filters for setup. The following types are available:
• Parametric (PE) filter with adjustable center frequency, boost/cut, and bandwidth parameters.
• Low Shelving (LS) filter with adjustable center frequency and boost/cut parameters. Rolloff rate
is selectable as 6dB or 12dB per octave.
• High Shelving (HS) filter with adjustable center frequency and boost/cut parameters. Rolloff rate
is selectable as 6dB or 12dB per octave.
• Low Pass (LP) filter with adjustable center frequency parameter. Rolloff rate is selectable as 6dB
or 12dB per octave, and response is selectable as Butterworth or Bessel.
• High Pass (HP) filter with adjustable center frequency parameter. Rolloff rate is selectable as 6dB
or 12dB per octave, and response is selectable as Butterworth or Bessel.
• Band Pass (BP) filter with adjustable center frequency and bandwidth parameters.
Each input channel page contains a graph which displays two plots:
• The frequency response of the currently selected input filter (red line)
• The total frequency response for the input channel (blue line)
The amplitude scale of the graph can be selected as one of two ranges, -15 to +15 or -30 to +30 (dB
gain) by means of the radio buttons below the graph.
special set of 6 ADFE filters belonging to each input channel. These are very narrow notch filters
placed at frequency points where feedback is either known to be likely ("static" deployment) or is
actually happening ("dynamic" deployment).
tab take effect immediately. As always, the changes are
not permanent unless the DM84 settings are stored to a
preset in nonvolatile memory.
Frequency
Response
Graph
Graph Scale
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