AirTools 6200 - Program Management

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12
User’s Guide
AGC Goal - The desired output signal level to maintain. (Effective in
AGC mode only).
Compressor Threshold - This parameter is disabled in AGC mode.
Compressor Ratio - This parameter is disabled in AGC mode.
CompressorMakeup-ThisparameterisdisabledinAGCmode.
LOW PASS FILTER:
Low pass filters allow selectively modifying a signal by attenuating
all signals above a specified cut-off frequency. They can be useful to
remove noise or other unwanted frequencies. A low pass filter in a
voice processor is typically used to limit the high frequency content
sent to downstream processing or the transmitter. The 6200 offers
6dB/octave,12dB/octave,18dB/octaveand24dB/octavefilters.
Additionally, “peak” versions of each filter are provided for further
flexibility and tuning. The filters with the steeper response filter
more sharply.
Controls (Low Pass Filter):
Bypass/Enabled - When bypassed, the input is sent unmodified to the
output. When enabled, the module processes the signal.
Low Pass Frequency - Determines the cut-off frequency of the filter.
All frequencies above this will be progressively attenuated. Technically,
thisfrequencyisthe“3dBdownpoint”,i.e.thepointwherethefilter
responseis3dBlowerthanitisforunaffectedsignals.
LP Filter Slope - Determines the type of filter (slope) to use in order to
select how steep or aggressive the filter is.
Technical note: The module implements Butterworth filters which are
generally preferred for audio because of their flat frequency response in
the pass band.
OUTPUT:
Thefinal“DSPModule”istheoutputlevel.Theoutputisloosely
labeledaDSPModuleastheleveladjustmentdoeshappeninthe
digital domain within the DSP and its parameters are stored within the
programs, however, it can not be reordered or bypassed/enabled as
the other modules can. The output level provides the final gain stage
beforethephysicaloutput(s)oftheunitandhasarangeof-72.0dB
to +24.0 dB. Typically, this control would remain as close to 0.0 dB
as possible using it only for level matching to downstream equipment
or to compensate for gain added or subtracted by the upstream DSP
modules.
If it is necessary to connect the output of the 6200 to a microphone
level input, see Appendix A for information on converting the 6200’s line
level output(s) to mic level.
OUTPUT METERING:
You can monitor the output meters by viewing the “Out LVL” menu
accessedbypressingtheHOMEbuttononcethenturningtheADJUST
knob clockwise twice. A meter for channel 1 is displayed on the top
line, channel 2 on the bottom line. Unity gain is represented as an
“open square” symbol and corresponds to an output level of -20 dBFS
= +4 dBu = 0 VU.
DSP MODULE WRAP-UP:
That covers the available DSP modules and their controls. For a
graphic view of the menu structure, see Appendix B.
Programs
The 6200 features 256 memory locations in which mono or stereo
programs may be stored. If a program is mono, it can be loaded onto
or saved from either Channel 1 or Channel 2 independently. A stereo
program stores information for both channels simultaneously.
Be advised:
1. When loading a stereo program onto a unit configured for dual
mono operation, both channels will be overwritten with the stereo
program’s information.
2. When changing the unit to stereo operation from dual mono,
channel 1’s settings will be applied to channel 2, thus overwriting
channel 2’s settings.
3. Loadingamonoprogramontoeitherchannelwhentheunitis
configured for stereo operation will result in the automatic configuration
of the unit to dual mono mode.
Each program can be named with up to 20 characters. A program
loads/saves of all settings under the Channel 1/2 menu trees (see
Appendix B), including module order. Each program may be loaded
manually by any of the means mentioned in the rest of this User’s
Guide,orautomaticallybytime/dateusingthebuilt-inEventManager
covered in the 6200 Designer’s online help module.
Saving a Program
Use this process to save a program you have created or modified.
1. Press and hold the LOAD 1/SAVE 1 button for approximately one
second. The screen will read “Save to Program 1?” and the name of
the program currently stored in this location will readout on the line
below.
2. Turn the ADJUST knob to locate the program location (1-256) you
wish to save to.
3. PressandholdtheLOAD 1/SAVE 1 button again for approximately
onesecondandthescreenshouldread“SaveMonoorStereo?”.
4. Turn the ADJUSTknobtotogglebetweenMonoandStereoformats.
5. Once you have chosen your format for the program, press and hold
the LOAD 1/SAVE 1 button again for approximately one second.
6. The screen should briefly display “Saving...” and then return to the
home screen.
NOTE: The above steps assume you are working with Channel 1. To
perform a save using the parameters on Channel 2, perform the above
steps using the LOAD 2/SAVE 2 button instead.
Basic Setup