Voice alarm device

1. A fire alarm system combined with a plurality of voice alarm devices, the fire alarm system comprising:

a control panel arranged to control one or more devices on an addressable fire alarm loop;

one or more detector devices arranged to send an alarm condition signal to the control panel upon detection of an alarm condition; and

one or more notification devices arranged to receive an alarm output signal from the control panel,

wherein the plurality of voice alarm devices are separate devices from the one or more detector devices and the one or more notification devices and are arranged to output an audible alarm voice message upon receipt of an alarm output signal from the control panel, the voice alarm devices comprising:

a loop connection interface for retroactively fitting the voice alarm devices to the fire alarm loop, arranged to connect the voice alarm devices to the fire alarm loop;

a processor, arranged to process signals received via the fire alarm loop;

at least one memory, arranged to store one or more audio files; and

a speaker, arranged to output the one or more audio files,

wherein the processors of the voice alarm devices are configured to process timing information so that voice alarm devices in close proximity to each other have synchronized audio; and

wherein the alarm output signal from the control panel comprises timing information, defining a point in time at which a selected audio file of the one or more audio files should be output by each of the plurality of voice alarm devices to synchronize the audio to be reproduced at different periods from each other.

2. The fire alarm system of claim 1 , wherein the fire alarm loop uses a two-wire communication protocol to enable signaling between devices on the fire alarm loop.

3. The fire alarm system of claim 1 , wherein the one or more audio files comprise at least one of a voice alarm message, a system test message and music.

4. A voice alarm device, arranged to connect to an addressable fire alarm loop of a fire alarm system, separate from a detector device and a notification device of the system, the voice alarm device comprising:

a loop connection interface for retroactively fitting voice alarm devices to the fire alarm loop, arranged to connect the voice alarm device to the fire alarm loop;

a processor arranged to process signals received via the fire alarm loop;

at least one memory arranged to store one or more audio files; and

a speaker arranged to output the one or more audio files;

wherein the processor of the voice alarm device is configured to process timing information so that the voice alarm device has audio which is synchronized with the timing information; and

wherein the processor is further arranged to determine, based on at least one of the signals, the timing information and output one of the audio files through the speaker at a corresponding time to synchronize the audio to be reproduced at different periods from each other.

5. The voice alarm device of claim 4 , wherein the loop connection interface is arranged for use with a two-wire communication protocol.

6. The voice alarm device of claim 5 , wherein the one or more audio files comprise at least one of a voice alarm message, a system test message and music.