BW Broadcast DSPXtra-FM, Operational Manual

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Processing Parameters
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User Level: This parameter allows you to select between beginner and advanced modes. Beginner mode
restricts access to certain menus and controls.
The 'INPUT' menu contains all of the options and parameters relating to the control and conditioning of
the audio inputs.
Source This parameter allows you to select the between the analog and digital inputs as the source for the
processing.
Input Mode: This parameter allows you to select different mono options as well as the default Stereo option.
There is also the ability to swap the left/right channels.
Analogue Input A/D Clip Level: Allows you to set the analogue input level with reference to the DSPXtra-
FM's A/D converter. This would normally be set to +24dBu if driving the DSPXtra-FM from professional
audio equipment. This would translate to the wide-band AGC being driven to 12dB gain reduction by a 0VU
(+4dBu) audio signal. Make sure that the input audio meters NEVER show clipping under any conditions.
Right Trim: This parameter allows you to adjust the right channels gain in small increments to BALANCE
out any small gain discrepancies between the left and right channels. The range is +/- 3dB.
Input Fail Switch: This parameter allows you to turn on the silence detection system and specify a silence
time. When enabled this parameter will switch the input source from the primary to the secondary source
when a predetermined length of silence occurs.
High pass filter: This parameter allows you to select from a variety of high pass filters. You can select from
20Hz, 30Hz, 40Hz, 50Hz and 60Hz. You also have the ability to bypass the high pass filter with the 'OFF'
option. The high pass filter can be used to reduce rumble on vinyl or can be effective in removing low fre-
quency energy that could otherwise cause carrier shift (AFC LOOP) problems in older FM transmitters. We
suggest you leave the high pass filter off unless you have a reason to turn it on.
Phase Rotator: This parameter if enabled will help to reduce vocal distortion in aggressive presets by reduc-
ing asymmetry in the voice which would otherwise put more workload on the clipping stages. We recommend
enabling this option if you want competitive loudness; otherwise leave it off as the phase rotation process
does colour the sound slightly, although this coloration is often used for artistic effect.
Pre-emphasis: This parameter allows you to activate pre-emphasis when the DSPXtra-FM is being used to
process for FM broadcast. The available options are 50 µs, 75 µs and OFF.
The 'PROCESS' menu allows access to all of the processing blocks that make up the DSPXtra-FM. There
are only sub-menus inside the 'PROCESS' menu. The submenus are laid out in the same configuration
as the signal path through the DSPXtra-FM.
'ARIANE AGC'
The ARIANE AGC in the DSPXtra-FM like any automatic gain control device is designed to correct input
level fluctuations and provide a consistent level to the other DSPXtra-FM processing blocks that follow it. The
Ariane AGC in the DSPXtra-FM is designed to operate in an undetectable, unobtrusive manner similar to a
trained operator controlling a mixing desk. The Ariane AGC can operate in ‘sum and difference’ matrix mode
or conventional stereo mode, with or without channel coupling.
Mode: This parameter selects which mode of operation to use, Matrix, Stereo or Bypassed.
The 'XOVER' menu provides the user with another tool in creating their sonic signature.
'B1-2 XOVER' Sets the B1-2 Xover point to one of five frequencies.
'B2-3 XOVER' Sets the B2-3 Xover point to one of five frequencies.
'B3-4 XOVER' Sets the B3-4 Xover point to one of five frequencies.
The 'MATRIX' menu contains the controls for the matrix mode of operation
(SHOWN IN MATRIX MODE)