Voice Alarm Systems

Voice alarm/evacuation technology has been born from the public address industry and past regrettable disasters most are familiar with.

A voice alarm is, however, not simply a public address system connected to the fire alarm panel, it is much more. A voice alarm system has to work when needed during an emergency and is, therefore, fully monitored at all times. A combination of clear pre-recorded messages and live announcements (to selected areas) enable a controlled and gradual or ‘phased’ evacuation.

Each voice alarm system is designed and built specifically for each project – no two systems are identical. Activated automatically by the fire alarm panel during an emergency, the system will, typically, evacuate areas in immediate danger and alert others.

We Offer Many Benefits

More Effective than Alarm Sounders

Research has shown that in an emergency alarm situation, only 13% of people react in a timely manner to a bell or tone, whilst 75% of people react quickly to a voice message explaining the nature of the emergency.

Not Just for Emergency Usage

For every day use, a voice alarm system can also be used as a feature-rich public address (PA) system, background music broadcast to selected (or all) areas, broadcast of advertisements or other timed messages, and more.

Fail Safe

All critical signal paths of a voice evacuation system are fully monitored – from the fire officer’s microphone, through the amplifiers to the end of the loudspeaker lines. Also, any faults detected with the power supply, internal battery charger and backup batteries are reported to enable immediate action.

Phased Evacuation

In some larger complex premises, the emergency arrangements are designed to allow people who are not at immediate risk from a fire to delay starting their evacuation.

A voice alarm system provides a system of evacuation in which different parts of the premises are evacuated in a controlled sequence of phases, those parts of the premises expected to be at greatest risk being evacuated first.

Intelligibility and Audibility

A vital part of a voice alarm system is that the message can be heard (audibility) and understood (intelligibility).
Speech intelligibility increases with increasing direct-to-reverberant ratio.

Each loudspeakers has a different dynamic, which will directly affect this ratio. Equally, each space that we install loudspeakers within is different. Some are more reverberant making intelligibility more difficult.
Vindex are able to acoustically model a space to predict what type of loudspeaker should be used and how many need to be installed.

Compliant Loudspeakers

Compliant speakers are required for use in Voice Alarm systems under the use of the following standards: BS
5839 Part 8, ISO 7240 Parts 16 & 24. Other standards covering Sports and Stadia are currently under review and are likely to also be cross referenced with EN5 4 Part 24.

EN54-16:2008 requires speakers within the Voice Alarm Control Indicating Equipment (VACIE) to be compliant with EN54-24.

“Vindex Systems continually come up trumps; whether it is for urgent reactive service,
preventative maintenance or even creative ideas to help us with ongoing operational
issues they never shirk from their responsibilities and critically have the relevant
qualified personnel to give us the highest levels of support we demand.”
Security Manager, Four Seasons Hotel