VAR4 / VAR12 / VAR20 - Operation Manual
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Equalisation [Compression]
[Threshold(dB) –20] Ratio (n:1) 04
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13.6.3 Audio
Compression Configuration
The audio compressor reduces the wide dynamic range of spoken speech to a smaller dynamic range in
order to achieve the best intelligibility and general received sound quality.
The audio compression involves several parameters, but to simplify the set-up process, most of these
parameters are pre-optimised with fixed values, for instance:
•
Attack time = 50ms
•
Decay time = 1000ms
The configurable parameters are:
•
Threshold level
This is the level in dB at which at the compression begins.
•
Compression ratio
This is the amount of gain reduction applied to the input signal when it exceeds the threshold level.
In order to adjust the audio compression proceed as follows.
1. Select
Configuration
Æ
System
Æ
Router
Æ
Outputs
Æ
Configuration
.
2. Scroll the output list and select the required induction loop output:
[O/P #1 - OUTPUT 01]
Default value:
output 1
Outputs:
4 outputs for VAR4
12 outputs for VAR12
20 outputs for VAR20
Note:
Not all of the VAR Router’s outputs can be configured to support Induction Loops;
Table
details the possible induction loop output allocation.
The output name is shown on the right side of the display. The output name above is the
output 1 default name, however this may have been changed according to each site’s
configuration.
3. Move to, and select the
Ind Loop
menu item.
Level [Ind Loop] Surv Override Name
4. The induction loop type is displayed. Make sure that the correct induction loop type is selected, and
then press the SELECT key to proceed to the next menu level.
5. Move to, and select the
Equalisation
menu item.
6. Move to, and scroll the threshold level until the required band is displayed.
Default value:
‘–20’
Possible values: –20dB to 0dB (1dB steps)
Note:
E.g. setting the threshold to –20dB will cause any input signal above –20dB to be shaped by the
compressor according to the configured compression ration.
Содержание VAR12
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