AU2022202171A1 - Fire notification system with wireless voice positioning alarm - Google Patents

Abstract

FIRE NOTIFICATION SYSTEM WITH WIRELESS VOICE POSITIONING ALARM A fire notification system includes a wireless 5 fire alarm main unit (1) and a wireless fire alarm sub-unit (2) that are installed in different rooms of a building (9), respectively. When there is a fire in one of the rooms and the fire is detected by the corresponding one of the main unit (1) and the sub 10 unit (2), the main unit (1) and the sub-unit (2) broadcast an alarm voice message (61) that contains a room identification of the room which is on fire. (FIG. 1) 2(2C) 2(2B) Sub-unit 24 Sub-unit 24 7B1 LivingIroom Second bedroom on 2 floor I /on 2nd floor 3 ----- -- - - - - - -- -I ---- - - - Central control Main Sub-unit Sunit 311 devices Alertmessage 5 2(2A) 14 24 8 7A Router Main room First bedroom _ on 1 st loor I on 1 t floor L----- - - - - - -- - -.-- - -.-- - - -- - - - Network 9 Mobile device Wireless communication 41 module Display module 42 Storage module '" 43 F App ::---431 Processing module -" 44 Input module -_ 45 FIG.1

Description

2(2C) 2(2B) Sub-unit 24 Sub-unit 24 7B1

LivingIroom Second bedroom on 2 floor I /on 2 nd floor 3 ----- -- - - - - - -- -I -- - - - Central control Main Sub-unit Sunit 311 devices Alertmessage 5 2(2A) 14 24 8 7A Router Main room First bedroom _ on 1 st loor I on 1 t floor L----- - - - - - - - - -.-- - -.-- - - -- - - -

Network

9

Mobile device Wireless communication 41 module

Display module 42

Storage module '" 43

F App ::---431

Processing module -" 44

Input module -_ 45

FIG.1

FIRE NOTIFICATION SYSTEM WITH WIRELESS VOICE POSITIONING ALARM

The disclosure relates to a fire notification

system, and more particularly to a fire notification

system with wireless voice positioning alarm.

General residential fire protection systems

hardly ever include a centralized graphic control

device that is connected to an emergency dispatch

center because of their small scale. Therefore, when

a residential fire alarm (e.g., smoke detector, heat

detector, etc.) detects a fire and sends out an alarm,

a person who hears the alarm would need to make a

phone call to report the incident to the emergency

dispatch center, and request the emergency dispatch

center to notify a local fire department to come for

rescue. However, the above-mentioned traditional

telephone reporting method is inefficient and

inconvenient, and there is a possibility that the

person who makes the call gives out the wrong address,

thus delaying the rescue. In addition, the

traditional fire alarm will only sound when itself

senses a fire, and all the fire alarms that sense a

fire will sound the same alarm (e.g., "fire, fire,...",

etc.), so people can at best make a rough judgment

as to which rooms may be having a fire based on the

volume of the alarm, and would be unable to identify which rooms are actually on fire.

Therefore, an object of the disclosure is to

provide a fire notification system with wireless

voice positioning alarm.

According to the disclosure, the fire

notification system includes a wireless fire alarm

sub-unit and a wireless fire alarm main unit. The

wireless fire alarm sub-unit is to be installed in a

first room of a building, and is configured to detect

whether there is a fire in the first room, and to

wirelessly send out a sub-unit alarm trigger signal

upon detecting a fire in the first room. The sub

unit alarm trigger signal contains a sub-unit address,

which is an address of the wireless fire alarm sub

unit. The wireless fire alarm main unit is to be

installed in a second room of the building, and is

configured to detect whether there is a fire in the

second room, to wirelessly send out a main unit alarm

trigger signal upon detecting a fire in the second

room, and to receive the sub-unit alarm trigger

signal sent out by the wireless fire alarm sub-unit.

The main unit alarm trigger signal contains a main

unit address, which is an address of the wireless

fire alarm main unit. Each of the wireless fire alarm

sub-unit and the wireless fire alarm main unit stores

a first room alarm voice message and a second room

alarm voice message that respectively correspond to the sub-unit address and the main unit address. The first room alarm voice message includes a first room identification for identification of the first room, and the second room alarm voice message includes a second room identification for identification of the second room. The wireless fire alarm sub-unit is configured to broadcast the first room alarm voice message upon detecting a fire in the first room, and the wireless fire alarm main unit is configured to, upon receipt of the sub-unit alarm trigger signal, broadcast the first room alarm voice message based on the sub-unit address contained in the sub-unit alarm trigger signal. The wireless fire alarm main unit is configured to broadcast the second room alarm voice message upon detecting a fire in the second room, and the wireless fire alarm sub-unit is configured to, upon receipt of the main unit alarm trigger signal, broadcast the second room alarm voice message based on the main unit address contained in the main unit alarm trigger signal.

Other features and advantages of the disclosure

will become apparent in the following detailed

description of the embodiment(s) with reference to

the accompanying drawings, of which:

FIG. 1 is a block diagram illustrating an

embodiment of a fire notification system with

wireless voice positioning alarm according to the disclosure;

FIG. 2 is a block diagram illustrating a wireless

fire alarm main unit of the embodiment;

FIG. 3 is a block diagram illustrating a wireless

fire alarm sub-unit of the embodiment; and

FIG. 4 is a schematic diagram illustrating a

screen shown on a mobile device of the embodiment

that executes an application.

Before the disclosure is described in greater

detail, it should be noted that where considered

appropriate, reference numerals or terminal portions

of reference numerals have been repeated among the

figures to indicate corresponding or analogous

elements, which may optionally have similar

characteristics.

Referring to FIG. 1, an embodiment of a fire

notification system with wireless voice positioning

alarm according to this disclosure is adapted for

use in a building 9 having multiple rooms and a

router 8 installed therein, where the router 8 is

connected to a network (e.g., the Internet). The fire

notification system includes several wireless fire

alarm units, including a main unit 1 and multiple

sub-units 2, a central control device 3, a mobile

device 4 and an emergency button 5. In the

illustrative embodiment, the building 9 has a main

room and a first bedroom on the first floor, and a living room and a second bedroom on the second floor; the main unit 1 is installed in the main room, which may be occupied by an aging parent, a bed-ridden member of the family, etc.; and the sub-units 2 include a first sub-unit 2A installed in the first bedroom, a second sub-unit 2B installed in the second bedroom, and a third sub-unit 2C installed in the living room. Each of the wireless fire alarm units

1, 2 may be, for example but not limited to, an

addressable smoke detector (e.g., photoelectric

smoke detector) or an addressable heat detector (e.g.,

fixed temperature heat detector) that has a unique

address (or number).

Referring to FIGS. 1 and 2, the main unit 1

includes a wireless communication unit 11, a sensor

unit 12, a speaker 14, a camera unit 15, a storage

unit 16 (e.g., flash memory), and a processing unit

13 (e.g., a microcontroller) that is electrically

connected to the elements 11, 12, 14, 15, 16. In this

embodiment, the wireless communication unit 11

enables the main unit 1 to wirelessly communicate

with the central control device 3 and the sub-units

2 using, for example but not limited to, radio waves

of 433 MHz. The main unit 1 uses the sensor unit 12

to sense whether a fire has occurred in the room

where the main unit 1 is located (e.g., the main room

in the illustrative embodiment), and is configured to send out a main unit alarm trigger signal

(hereinafter referred to as "main unit signal")

through the wireless communication unit 11 upon

detecting a fire in the room (e.g., a fire 7A in the

main room in FIG. 1), wherein the main unit signal

contains the address of the main unit 1 (referred to

as main unit address hereinafter).

Referring to FIGS. 1 and 3, each of the sub-units

2 includes a wireless communication unit 21, a sensor

unit 22, a speaker 24, a camera unit 25, a storage

unit 26, and a processing unit 23 that is

electrically connected to the elements 21, 22, 24,

25, 26. In this embodiment, the wireless

communication unit 21 enables the sub-unit 2 to

wirelessly communicate with the main unit 1 using, for example but not limited to, radio waves of 433

MHz. Each of the sub-units 2 uses the sensor unit 22

to sense whether a fire has occurred in the room

where the sub-unit 2 is located (e.g., the first

bedroom, the second bedroom or the living room in

the illustrative embodiment), and is configured to

send out a sub-unit alarm trigger signal (hereinafter

referred to as "sub-unit signal") through the

wireless communication unit 21 upon detecting a fire

in the room (e.g., a fire 7B in the second bedroom

in FIG. 1), wherein the sub-unit signal contains the

address of the sub-unit 2 (referred to as sub-unit address hereinafter).

In this embodiment, the main unit 1 is configured

to receive the sub-unit signal sent by any one of

the sub-units 2, and to, upon receipt of the sub

unit signal from one of the sub-units 2, send the

sub-unit signal thus received to at least each of

the sub-units 2 other than said one of the sub-units

2.

Referring to FIGS. 2 and 3, each of the storage

units 16, 26 stores a correspondence table 60, an

alarm message set 61, and an emergency voice message

62. The alarm message set 61 includes a plurality of

alarm messages, each of which corresponds to the

address of a respective one of the wireless fire

alarm units 1, 2 and corresponds to the room where

the respective unit 1, 2 is located. Each of the

alarm messages is a voice message that includes a

room identification for identification of the

corresponding one of the rooms. In the illustrative

embodiment, since the building 9 has multiple floors

(i.e., the first floor and the second floor), the

room identification may indicate on which floor the

corresponding room is located. The correspondence

table 60 includes an address field related to the

addresses of the wireless fire alarm units 1, 2, and

an alarm message field related to the alarm messages,

and the correspondence table 60 indicates correspondences between the addresses and the alarm messages. Table 1 exemplarily provide the correspondence table 60 for the illustrative embodiment.

Table 1 Address of wireless Alarmmessage fire alarm unit address of main unit 1 The main room on the first floor is on fire address of sub-unit 2A The bedroom on the first floor is on fire address of sub-unit 2B The bedroom on the second floor is on fire address of sub-unit 2C The living room on the second floor is on fire

The emergency button 5 is disposed in the vicinity

of (e.g., in the same room as or within a

communication range of) one of the wireless fire

alarm units 1, 2, and uses a short-distance wireless

communication technology (e.g., radio waves of 433

MHz, Bluetooth, etc.) to wirelessly communicate with

said one of the wireless fire alarm units 1, 2. In

the illustrative embodiment, the emergency button 5

is disposed in the main room, and wirelessly

communicates with the main unit 1.

The fire notification system according to this

disclosure is configured such that, when any one of

the units 1, 2 detects a fire, all of the units 1, 2

will broadcast one of the alarm messages that

corresponds to the room with the fire based on the

address contained in the alarm trigger signal (the

base unit signal or the sub-unit signal).

As exemplified in FIG. 1, upon detecting the fire

7A, the main unit 1 uses the speaker 14 to broadcast

the alarm message of "the main room on the first

floor is on fire", and wirelessly sends out the main

unit signal for receipt by each of the sub-units 2,

so as to trigger the sub-units 2 to use the speakers

24 to broadcast the alarm message of "the main room

on the first floor is on fire" based on the main unit

address contained in the main unit signal and the

correspondence table 60. People in the first bedroom,

the second bedroom and the living room can thus know

that the main room is on fire, which helps with the

escape.

Similarly, upon detecting the fire 7B, the sub

unit 2B uses its speaker 24 to broadcast the alarm

message of "the bedroom on the second floor is on

fire", and wirelessly sends out the sub-unit signal

(referred to as second-bedroom signal hereinafter)

that contains the sub-unit address of the sub-unit

2B to the main unit 1. Then, the main unit 1 uses

the speaker 14 to broadcast the alarm message of "the

bedroom on the second floor is on fire" based on the

sub-unit address contained in the second-bedroom

signal and the correspondence table 60, and

wirelessly sends out the second-bedroom signal for

receipt by at least each of the sub-units 2 other

than the sub-unit 2B, such as the sub-units 2A, 2C in the illustrative embodiment, so as to trigger the sub-units 2A, 2C to use their speakers 24 to broadcast the alarm message of "the bedroom on the second floor is on fire" based on the sub-unit address contained in the second-bedroom signal and the correspondence table 60. People in the other rooms can thus know that the second bedroom is on fire, which helps with the escape.

In addition, when a person is stuck in the main

room, he or she may press the emergency button 5 to

wirelessly send out an emergency trigger signal

(hereinafter referred to as "emergency signal") to

the main unit 1 by short-distance wireless

communication, so as to trigger the main unit 1 to

use the speaker 14 to broadcast the emergency voice

message 62 (e.g., "person in emergency, please help").

In some embodiments, the emergency signal contains

an address of the emergency button 5 (referred to as

button address hereinafter). In addition, the main

unit 1 may further use radio waves to wirelessly send

out the emergency signal for receipt by the sub-units

2, so that the sub-units 2 use their speakers 24 to

broadcast the emergency voice message 62 as well.

People in the first bedroom, the second bedroom and

the living room can thus know that the person in the

main room needs help.

It is noted that the emergency button 5 is configured for a person to seek help in any emergency situation, and thus is not limited to be used in a fire. In the illustrative embodiment, when the person encounters other kinds of emergencies (e.g., falling to the ground) in the main room, he or she may also press the emergency button 5 to make all of the wireless fire alarm units 1, 2 broadcast the emergency voice message 62 to call for help.

In a case that the emergency button 5 is placed

in another room, such as the second bedroom, when a

person needs help in the second bedroom, he or she

may press the emergency button 5 to send out the

emergency signal to the sub-unit 2B by short-distance

wireless communication, so as to trigger the sub

unit 2B to use its speaker 24 to broadcast the

emergency voice message 62. The sub-unit 2B may

further use radio waves to wirelessly send out the

emergency signal for receipt by the main unit 1, so

that the main unit 1 uses the speaker 14 to broadcast

the emergency voice message, and sends out the

emergency signal for receipt by the remaining sub

units 2A, 2C. Upon receipt of the emergency signal

from the main unit 1, the sub-units 2A, 2C would

broadcast the emergency voice message as well. People

in the main room, the first bedroom and the living

room can thus know that someone needs help in the

second bedroom.

Referring to FIGS. 1 and 4, the central control

device 3 may be, for example but not limited to, a

computer device, which is configured to wirelessly

receive the main unit signal, the sub-unit signal

and/or the emergency signal sent by the main unit 1,

and to generate an alert message 31 based on the main

unit address, the sub-unit address and/or the button

address contained in the main unit signal, the sub

unit signal and/or the emergency signal, where the

alert message 31 contains an address of the building

9 that may be predefined in the central control

device 3. In this embodiment, the central control

device 3 transmits the alert message 31 to the router

8 through wired connection, for the router 8 to

transmit the alert message 31 to the mobile device

4.

The mobile device 4 is used by a user, receives

the alert message 31 from the router 8, and has an

application (app) 431 installed therein. In this

embodiment, the mobile device 4 may be, for example

but not limited to, a smartphone, and includes a

wireless communication module 41 for connection to

the network, a display module 42 (e.g., a touch

screen), a storage module 43 (e.g., flash memory) to

store the application 431, an input module 45 (e.g.,

the touch screen), and a processing module 44 (e.g.,

a processor) electrically connected to the elements

41, 42, 43, 45.

The application 431 is capable of making the

mobile device 4 display the alert message 31 when

executed by the mobile device 4. As exemplified in

FIG. 4, when the address of the building 9 is "No.

X, Y road, Z City", the alert message 31 may be

generated as "There is a fire at No. X, Y road, Z

city".

In some embodiments, the application 431 may

further cause the mobile device 4 to display a

dialing icon 435 that is configured to, when being

touched by the user, make the mobile device 4

automatically dial a telephone number of an emergency

dispatch center, for the user to report the address

of the building 9 contained in the alert message 31,

which is displayed by the mobile device 4, to the

emergency dispatch center. Therefore, misreporting

the address may be avoided, and thus rescue actions

will not be delayed.

In some embodiments, the application 431 may

further cause the mobile device 4 to display a map

432 in the application 431, showing a location that

corresponds to the address of the building 9. As

illustrated in FIG. 4, the map 432 may include a fire

pattern 434 at the location corresponding to the

address of the building 9. In a case where the user

owns or manages multiple buildings, when one of the buildings (e.g., the building 9) is on fire, the user can remotely and immediately know the geographical location of the building that is on fire through the map 432 shown in the application 431, even if the user is away.

In this embodiment, the camera unit 15 of the main

unit 1 captures a real-time image of the main room,

and the camera units 25 of the sub-units 2A, 2B, 2C

capture real-time images of the first bedroom, the

second bedroom and the living room, respectively.

The main unit 1 may transmit the real-time image of

the main room to the mobile device 4 through the

central control device 3, the router 8 and the

network, and each of the sub-units 2 may transmit

the real-time image captured thereby to the mobile

device 4 through the main unit 1, the central control

device 3, the router 8 and the network. In some

embodiments, the alert message may further include

an indication for each room that is on fire. In the

illustrative embodiment, it is the main room and the

second bedroom that are on fire, so the application

431 causes the mobile device 4 to display the alert

message that includes a first indication indicating

that the main room on the first floor is on fire,

and a second indication indicating that the second

bedroom on the second floor is on fire. The

application 431 is configured in such a way that the mobile device 4 switches to displaying the real-time image of the main room when the user touches the first indication on the input module 45, and switches to displaying the real-time image of the second bedroom when the user touches the second indication on the input module 45.

As illustrated in FIG. 4, the alert message

displayed in the application 431 may include the

address of the building 9 and the room identification

of each room which is on fire (see the messages of

"the main room on the first floor is on fire" and

"the bedroom on the second floor is on fire" in FIG.

4). In case someone presses the emergency button 5,

the alert message 31 displayed in the application

431 may include an indication of, for example,

"person in emergency, please help", so as to notify

the user of the mobile device 4 to provide assistance.

In summary, the fire notification system with

wireless voice positioning alarm according to this

disclosure has at least the advantages as follows.

The first advantage is that, by virtue of the

correspondence table 60, the alarm message set 61,

the emergency voice message 62, and establishing

relationships between the addresses of the wireless

fire alarm units 1, 2 and the rooms of the building

9, when any one of the rooms of the building 9 is on

fire, all of the wireless fire alarm units 1, 2 will broadcast the alarm message that corresponds to the room that is on fire, so people in the building 9 can know exactly which room is on fire, which helps with the escape.

The second advantage is that help can be sought

using the emergency button 5. When a person (e.g.,

an elderly) encounters an emergency, such as falling

to the ground, he or she may press the emergency

button 5 to trigger the wireless fire alarm units 1,

2 to output the emergency voice message 62, so people

in other rooms may be notified to provide immediate

assistance.

The third advantage is that, since the alert

message 31 displayed on the mobile device 4 that

executes the application 431 contains an accurate

address of the building 9, chances that the user of

the mobile device 4 misreports the address to the

emergency dispatch center is greatly reduced, and

the delay of the rescue actions can thus be prevented.

The fourth advantage is that the alert message 31

displayed in the application 431 may further include

the room identification of the room that is on fire,

so the user of the mobile device 4 can know exactly

which room is on fire.

The fifth advantage is that the application 431

causes the mobile device 4 to display the map 432,

making the user of the mobile device 4 who may be away to know, remotely, the geographical location of the fire.

The sixth advantage is that the user can operate

the application 431 to watch the real-time image of

the room on fire, so the user can know more details

about the condition of the fire.

In the description above, for the purposes of

explanation, numerous specific details have been set

forth in order to provide a thorough understanding

of the embodiment(s). It will be apparent, however,

to one skilled in the art, that one or more other

embodiments may be practiced without some of these

specific details. It should also be appreciated that

reference throughout this specification to "one

embodiment," "an embodiment," an embodiment with an

indication of an ordinal number and so forth means

that a particular feature, structure, or

characteristic may be included in the practice of

the disclosure. It should be further appreciated that

in the description, various features are sometimes

grouped together in a single embodiment, figure, or

description thereof for the purpose of streamlining

the disclosure and aiding in the understanding of

various inventive aspects, and that one or more

features or specific details from one embodiment may

be practiced together with one or more features or

specific details from another embodiment, where appropriate, in the practice of the disclosure.

Claims (11)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A fire notification system with wireless voice

positioning alarm, comprising:

a wireless fire alarm sub-unit to be installed

in a first room of a building, and configured to

detect whether there is a fire in the first room,

and to wirelessly send out a sub-unit alarm trigger

signal upon detecting a fire in the first room,

wherein the sub-unit alarm trigger signal contains a

sub-unit address, which is an address of said

wireless fire alarm sub-unit; and

a wireless fire alarm main unit to be installed

in a second room of the building, and configured to

detect whether there is a fire in the second room,

to wirelessly send out a main unit alarm trigger

signal upon detecting a fire in the second room, and

to receive the sub-unit alarm trigger signal sent

out by said wireless fire alarm sub-unit, wherein

the main unit alarm trigger signal contains a main

unit address, which is an address of said wireless

fire alarm main unit;

wherein each of said wireless fire alarm sub

unit and said wireless fire alarm main unit stores a

first room alarm voice message and a second room

alarm voice message that respectively correspond to

the sub-unit address and the main unit address;

wherein the first room alarm voice message includes a first room identification for identification of the first room, and the second room alarm voice message includes a second room identification for identification of the second room; wherein said wireless fire alarm sub-unit is configured to broadcast the first room alarm voice message upon detecting a fire in the first room, and said wireless fire alarm main unit is configured to, upon receipt of the sub-unit alarm trigger signal, broadcast the first room alarm voice message based on the sub-unit address contained in the sub-unit alarm trigger signal; and wherein said wireless fire alarm main unit is configured to broadcast the second room alarm voice message upon detecting a fire in the second room, and said wireless fire alarm sub-unit is configured to, upon receipt of the main unit alarm trigger signal, broadcast the second room alarm voice message based on the main unit address contained in the main unit alarm trigger signal.

2. The fire notification system of claim 1, wherein

the first room identification indicates on which

floor the first room is located, and the second room

identification indicates on which floor the second

room is located.

3. The fire notification system of any one of the

preceding claims, further comprising a central

control device that is communicatively connected to

said wireless fire alarm main unit;

wherein said wireless fire alarm main unit is

configured to wirelessly send out the sub-unit

address upon receipt of the sub-unit alarm trigger

signal; and

wherein said central control device is

configured to, upon receipt of one of the sub-unit

address and the main unit address that is sent by

said wireless fire alarm main unit, generate an alert

message that contains an address of the building,

and to transmit the alert message to a router through

wired connection, for the router to transmit the

alert message to a mobile device of a user through a

network, so as to make the mobile device execute an

application to display the alert message.

4. The fire notification system of claim 3, wherein

said wireless fire alarm sub-unit and said wireless

fire alarm main unit are configured to wirelessly

communicate with each other using radio waves; and

wherein said wireless fire alarm main unit and

said central control device are configured to

wirelessly communicate with each other using radio

waves.

5. The fire notification system of claim 3 or 4,

wherein the alert message contains the first room

identification when said central control device

receives the sub-unit address, and contains the

second room identification when said central control

device receives the main unit address.

6. The fire notification system of any one of

claims 3 to 5, wherein the alert message makes the

mobile device that executes the application display

a map showing a location which corresponds to the

address of the building in the application.

7. The fire notification system of any one of

claims 3 to 6, further comprising the mobile device,

wherein said mobile device that executes the

application displays a dialing icon that is

configured to, when being touched by the user, make

said mobile device automatically dial a telephone

number of an emergency dispatch center, for the user

to report the address of the building contained in

the alert message, which is displayed by said mobile

device, to the emergency dispatch center.

8. The fire notification system of any one of

claims 3 to 7, wherein said wireless fire alarm sub- unit includes a camera unit configured to capture a real-time image of the first room, and is configured to transmit the real-time image of the first room to the mobile device for display by the mobile device that executes the application.

9. The fire notification system of any one of

claims 3 to 8, wherein said wireless fire alarm main

unit includes a camera unit configured to capture a

real-time image of the second room, and is configured

to transmit the real-time image of the second room

to the mobile device for display by the mobile device

that executes the application.

10. The fire notification system of any one of the

preceding claims, further comprising an emergency

button to be disposed in the vicinity of one of said

wireless fire alarm sub-unit and said wireless fire

alarm main unit;

wherein each of said wireless fire alarm sub

unit and said wireless fire alarm main unit stores

an emergency voice message;

wherein said emergency button is configured to,

when being pressed, wirelessly send out an emergency

trigger signal to make said wireless fire alarm sub

unit and said wireless fire alarm main unit broadcast

the emergency voice message.

11. The fire notification system of any one of the

preceding claims, wherein said wireless fire alarm

sub-unit is a first wireless fire alarm sub-unit,

the sub-unit alarm trigger signal is a first sub

unit alarm trigger signal, and the sub-unit address

is a first sub-unit address;

wherein said fire notification system further

comprises a second wireless fire alarm sub-unit to

be installed in a third room of the building, and

configured to detect whether there is a fire in the

third room, and to wirelessly send out a second sub

unit alarm trigger signal upon detecting a fire in

the third room, wherein the second sub-unit alarm

trigger signal contains a second sub-unit address,

which is an address of said second wireless fire

alarm sub-unit;

wherein each of said first wireless fire alarm

sub-unit and said wireless fire alarm main unit

further stores a third room alarm voice message that

corresponds to the second sub-unit address;

wherein said second wireless fire alarm sub-unit

stores the first room alarm voice message, the second

room alarm voice message and the third room alarm

voice message;

wherein the third room alarm voice message

includes a third room identification for identification of the third room; wherein said wireless fire alarm main unit is configured to, upon receipt of one of the first and second sub-unit alarm trigger signals from one of said first and second wireless fire alarm sub-units, send said one of the first and second sub-unit alarm trigger signals to the other one of said first and second wireless fire alarm sub-units; wherein said wireless fire alarm main unit and said first wireless fire alarm sub-unit are configured to, upon receipt of the second sub-unit alarm trigger signal, broadcast the third room alarm voice message based on the second sub-unit address contained in the second sub-unit alarm trigger signal; and wherein said second wireless fire alarm sub-unit is configured to, upon receipt of the first sub-unit alarm trigger signal, broadcast the first room alarm voice message based on the first sub-unit address contained in the first sub-unit alarm trigger signal, to, upon receipt of the main unit alarm trigger signal, broadcast the second room alarm voice message based on the main unit address contained in the main unit alarm trigger signal, and to broadcast the third room alarm voice message upon detecting a fire in the third room.