17
DN3816
8.2.1.6.1
Broadcast in progress
A GPO configured with the function
Broadcast in Progress will be activated when at least
one of the inputs selected is switched to the chosen audio output.
8.2.2
Setting the digital process parameters
8.2.2.1
Input audio adjustments
The audio settings for the inputs are available under the «
Control » tab.
8.2.2.1.1
Using Noise Gate on audio inputs
Each of the DN 3816’s inputs incorporates a digital noise gate which may be very useful for
eliminating earth hum, interference and other system background noises which may
randomly occur. The noise gate feature uses a powerful dynamic processor that works like
an automatic gate that lets through only the useful part of the signal. In fact, the noise
gate function only lets the signal through if it exceeds a predefined level. It thus separates
out the signal’s useful component from any background noise that may be present on the
input.
The noise gate threshold can be adjusted from –90 to 0 dBm.
8.2.2.1.2
Setting Bass/Treble on audio inputs
A standard Baxendall tone control circuit is incorporated on each of the DN 3816’s inputs for
digitally adjusting bass and treble. The mid-range frequency for adjusting the bass is 100 Hz
while the midrange frequency for adjusting the treble is 10 kHz.
The gain for each of these two frequencies is adjustable from -18 to +18 dB.
8.2.2.1.3
Setting Mute on the audio inputs
Each input channel has its own Mute function. This is used to deactivate the input signal.
8.2.2.1.4
Adjusting Volume on the audio inputs
Once all the audio input settings have been adjusted, the general volume of each input
needs to be set. The volume may be set from between –60 and +10 dB using the input
volume potentiometer.
To get the maximum dynamic range from the signal processing processor, the input volume
should be set so that the average value of the signal is between –3 and 0 dB on the Vu-
meter.
8.2.2.2
Output audio adjustments
The audio settings for the outputs are available under the «
Control » tab.
8.2.2.2.1
5 band parametric equaliser
Each of the DN 3816’s output channels incorporates its own wholly independent equaliser.
Each of the output channel’s equaliser sections can be used to make fine tone adjustments
to the signal.
The equaliser section provides true 5 band parametric equaliser functionality including
frequency adjustment Fc, quality factor Q and gain G for each band.
8.2.2.2.1.1
Frequency Fc
This is the centre frequency of the selected parametric equaliser band. The
selected frequency determines the centre frequency that may be adjusted using
Gain.
The frequency may be adjusted from 20 to 20,000 Hz.
8.2.2.2.1.2
Quality Factor Q
This is the frequency bandwidth around Fc. Setting Q to a high value can be used
for example to produce a notch filter. With a notch filter, it is possible, for
example, to attenuate the Larsen audio feedback effect (the resonant frequency
sometimes produced by a microphone). A low Q value can be used to widen the
frequency bandwidth affected.
Quality factor may be set to between 0.1 and 20.
8.2.2.2.1.3
Gain G
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