ASL INTERCOM VAR4 - Input Fade up and down Time Configuration

VAR4 / VAR12 / VAR20 - Operation Manual
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7.2.3 Input Fade Up and Down Time Configuration
It is possible to specify a fade up and fade down time for each Mic/Line input or Music input. This can be set
to provide the desired changeover fading, e.g. when a broadcast interrupts background music, or a lower
priority broadcast.
This is typically used on background music where a slow fade-up, in particular, is desirable.
The Fade Down time is:
• The time it takes for the signal to fade down when turned off (un-routed);
• The time it takes for the signal to fade down before an overriding broadcast is made in its place
The Fade Up time is the time the signal takes to fade up when:
• Turned on (routed);
• Override removed.
The diagram in Figure 5 illustrates the sequence of events during the enabling and disabling of a single
audio source (e.g. background music).
Figure 5 Sequence of Events for Single Audio Source
MUSIC
FADE UP=T1
FADE DOWN= T2
T1
MUSIC AUDIO
T2
ON
OFF
The diagram in Figure 6 illustrates the sequence of events during the override of a background music source
by a Paging Microphone with chime.
Note that the background music Fade Down time (T2) not used in this instance. Instead the microphone
Fade Down time (T4) is used.