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118 en | Introduction to make an announcement
10
Introduction to make an announcement
As PRAESENSA is a Public Address and Voice Alarm System, it is used to distribute data, live
speech, background music and (evacuation) messages. All data and audio in the system is
distributed in the form of announcements/calls.
An announcement/call always consists of the following attributes (click the link):
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Using the call station (extension)
The functionality of a call station, including the appearance of the items of the graphical user
interface LCD, and call station extension (buttons), are configured in: Call station, page 59 .
10.1
Announcement content
The content of a background music (BGM) announcement typically consists of an (mono/
stereo) line level audio signal coming from a BGM source, such as a music player, tablet,
mobile phone etc.
The content of normal announcements and emergency announcements is defined by a Call
definition, which can consist of:
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See Call definitions, page 81 .
10.2
Priority and announcement type
To each announcement, a priority is assigned. When two or more announcements are
addressed to the same zone, zone group or need shared resources (e.g. a message player),
the system only starts the announcement with the highest priority. The range of priorities that
is available for an announcement depends on the announcement type:
Priority
0 to 31
32 to 223
224 to 255
Announcements with the same priority operate on first in first serve basis, except in the case
of priority 255: announcements with the same priority 255 overrule each other, so the latest
becomes active. This assures that high priority announcements (microphones) that are left
behind in an active state will never block the system.
BGM announcements
Background music (BGM) announcements are typically used to distribute (background) music.
Their content consists of an audio signal from a BGM source. If a zone or zone group is already
in use by another announcement with the same priority or higher, the BGM announcement will
not be routed to that zone or zone group until it has been released by the other
announcement.
2020-09 | V1.20 | PRAESENSA 1.20
Announcement content, page 118
Priority and announcement type, page 118
Routing, page 119
A start tone (message).
Pre‑recorded message(s).
Live speech.
An end tone (message).
Announcement type
Background music (BGM)
Normal
Emergency
Configuration manual
PRAESENSA
Bosch Security Systems B.V.
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