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APPENDIX A
ALARM TRIGGERS
After collecting all the data, the DSP-based core compares the values measured with the
predefined by the user threshold levels, for all the alarms monitored. In case that a parameter
is beyond limits, the device will initiate the sending of an alarm notification via the selected
communication path. All the alarm events are stored in the device’s log. It is essential that, if there
is a very short fault of the signal, with duration shorter than the alarm
Trigger time
, the device
would not trigger an alarm.
There are several Alarm Triggers for the following parameters:
RF
,
Stereo Loss
,
FM Left
Audio
,
FM Right Audio
,
IP Left Audio
,
IP right Audio
. An option for defining different limits for
each of the parameters is present. All these values, the
Trigger time
and the
Release time
have to
be assigned separately for each of the alarms.
Block Diagram of Alarm Automata
When an observation event takes place, the alarm trigger’s state will refresh, if necessary.
Should we consider an instance when the alarm trigger is in
Idle
state, having in mind that
an alarm is not triggered immediately when a parameter level passes beyond threshold: If the
