Fire alarm system

Abstract

This enables a highly convenient calling function that combines call control with a cordless phone handset using the transmission function and calls made by connecting the handset to the phone jack. [Solution] The fire alarm system includes a transmission line and an emergency telephone line connecting a telephone repeater 18 and a receiver 10, and a maintenance telephone line connecting a transmitter 36 and a receiver 10. The receiver 10 stores address information that can identify the telephone repeater 18, and establishes a call connection with the emergency telephone handset 20a by transmitting and receiving call control signals via the transmission line between the telephone repeater 18 to which the emergency telephone handset 20a is connected. The receiver 10 establishes a call connection with the maintenance telephone handset 40a by operation by an operator located near the transmitter 36. When an incoming call is received from the emergency telephone handset 20a, the system displays an indication that an incoming call has been received, allowing the emergency telephone handset 20a, which is the source of the incoming call, to be identified. When an incoming call is received from the maintenance telephone handset 40a, the system provides a notification indicating that an incoming call has been received from the maintenance telephone handset 40a.

Description

Technical Field

[0001] The present invention relates to a fire alarm device that makes a call connection between a telephone main unit and a telephone sub-unit using a transmission line and a telephone line to which a fire detector is connected from a receiver.

Background Art

[0002] Conventionally, in a fire alarm device known as the R type, a terminal device such as a fire detector having a transmission function is connected to a transmission line drawn from a receiver. When a fire is detected, for example, based on a fire interruption from the fire detector, a search command is issued to identify the address of the fire detector that has issued an alarm, the fire occurrence address is displayed, and fire data is collected from the identified fire detector for monitoring.

[0003] In this way, when the address of the fire detector that has detected a fire is known, appropriate evacuation guidance and fire extinguishing activities become possible, and it is an essential function particularly for fire monitoring of large-scale facilities.

[0004] Also, in a fire alarm device, as an emergency communication device, a telephone main unit is provided in the receiver, and a telephone jack provided in a transmitter or the like is connected to a telephone line drawn from the receiver to a warning area. During a fire or inspection, when a maintenance telephone sub-unit carried by an operator is connected to the telephone jack of a transmitter or the like, a call is made from the receiver, and a call connection with the maintenance telephone sub-unit can be established by going off-hook the telephone main unit.

[0005] In addition, as related equipment of a fire alarm device, emergency telephone equipment may be provided. The emergency telephone equipment has an emergency telephone panel with a telephone main unit provided at the same location as the receiver, and a telephone line and a control line are drawn from the emergency telephone panel to a warning area and an emergency telephone sub-unit is connected.

[0006] While maintenance telephone equipment for fire alarm systems cannot be called by specifying a maintenance telephone handset from the main telephone unit, emergency telephone equipment allows users to arbitrarily specify and call an emergency telephone handset by dialing a telephone number from the emergency telephone panel. This makes it usable not only in emergencies such as fires, but also for daily communication to maintain and manage the equipment. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2004-064709 [Patent Document 2] Japanese Patent Publication No. 2017-004451 [Patent Document 3] Japanese Patent Publication No. 2016-076064 [Patent Document 4] Japanese Patent Publication No. 2017-068523 [Patent Document 5] Japanese Patent Application Publication No. 10-69591 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] However, conventional emergency telephone systems that allow users to specify and call specific cordless telephones must be installed as part of the fire alarm system, which increases equipment costs. On the other hand, maintenance telephone systems for fire alarm systems, which connect maintenance cordless telephones to the telephone jacks of the telephone lines and connect to the base telephone unit, have lower equipment costs, but they lack advanced call control such as specifying a cordless telephone for calling, making them less convenient than emergency telephone systems.

[0009] The present invention aims to provide a fire alarm system equipped with a highly convenient call function that enables both advanced call control, including calling a designated telephone handset using the transmission function used in R-type fire alarm systems, and calls made by connecting a telephone handset to a telephone jack. [Means for solving the problem]

[0010] (Fire alarm system 1 equipped with a first telephone system and a second telephone system) The present invention relates to a transmission line connecting terminal equipment, including a telephone repeater, located in a restricted area, and a receiver, A first telephone line connecting the telephone repeater and the receiver, A second telephone line connecting the transmitter and receiver located in the restricted area, A fire alarm system equipped with, The receiver stores address information that can identify the telephone repeater and enables communication connections between the first telephone handset connected to the first telephone line and the second telephone line's voice unit connected to the second telephone line via the telephone repeater. The receiver and the first telephone handset are connected by the transmission and reception control of predetermined call control signals via a transmission line between the receiver and the telephone repeater to which the receiver and the first telephone handset are connected. The receiver and the second telephone line's communication unit are connected by an operator located near the transmitter. When an incoming call is received from the first telephone handset, an indication that an incoming call has been received will be displayed in a way that identifies the first telephone handset, which is the source of the incoming call, based on the address information of the telephone relay to which the first telephone handset is connected. The system is characterized by providing notification that an incoming call has been received from the second telephone line's voice unit when an incoming call is received from the second telephone line's voice unit. [Effects of the Invention]

[0011] (Effectiveness of fire alarm systems) The present invention relates to a fire alarm system in which terminal equipment including a telephone repeater is connected to a transmission line extended from a receiver to a protected area, and a telephone repeater is connected to a telephone line also extended from the receiver to the protected area and to which a telephone jack is connected. The receiver is capable of making calls to a first telephone handset connected to the telephone line via the telephone repeater and a second telephone handset connected to the telephone line via the telephone jack. The call connection with the first telephone handset is controlled by sending and receiving predetermined call control signals via the transmission line between the receiver and the telephone repeater to which the first telephone handset is connected, and the call connection with the second telephone handset is controlled by the connection status of the second telephone handset to the telephone jack. If the connection of the second telephone handset to the telephone jack is detected while a call is being made to the first telephone handset, the receiver switches to making a call to the second telephone handset. By utilizing the transmission function of the transmission line used in R-type fire alarm systems for call control, advanced call control, including calling a designated first telephone handset, can be easily and inexpensively realized.

[0012] Furthermore, in addition to advanced call control, including calling a designated first telephone handset using a transmission line, it is possible to simultaneously make calls by connecting a second telephone handset to the telephone jack without compromising its functionality, resulting in even greater convenience.

[0013] Furthermore, if a second cordless phone is connected to the phone jack while a call is in progress between the base phone unit and the first cordless phone, the existing call between the base phone unit and the first cordless phone will be put on hold, and the call with the second cordless phone will be given priority.

[0014] (Effectiveness of fire alarm systems equipped with emergency telephone equipment and maintenance telephone equipment) In another aspect of the present invention, there is provided a fire alarm device including a transmission line drawn from a receiver to a warning area and connected to a terminal device including a telephone repeater, a first telephone line drawn from the receiver to the warning area and connected to the telephone repeater, and a second telephone line drawn from the receiver to the warning area and connected to a telephone jack. The receiver stores address information capable of identifying the telephone repeater, and can establish a call connection with a first telephone handset connected to the first telephone line via the telephone repeater and a second telephone handset connected to the second telephone line via the telephone jack. The call connection with the first telephone handset is controlled by transmitting and receiving a predetermined call control signal via a transmission line between the first telephone handset and the telephone repeater to which the first telephone handset is connected. The call connection with the second telephone handset is controlled by the connection state of the second telephone handset to the telephone jack. When there is an incoming call from the first telephone handset, a display indicating the incoming call is made in a manner that enables identification of the incoming first telephone handset based on the address information of the telephone repeater to which the first telephone handset is connected. When there is an incoming call from the second telephone handset, a notification indicating the incoming call from the second telephone handset is made. Therefore, for the first telephone device using the first telephone line, a call can be made by transmitting and receiving a predetermined call control signal via the transmission line. For the second telephone device using the second telephone line, a call can be made by connecting the second telephone handset to the telephone jack. Compatibility between the first telephone device and the second telephone device is achieved, and furthermore, high convenience is obtained.

[0015] In addition, since the functions of the master unit devices in the first telephone device and the second telephone device are integrated into the receiver, the installation space for the fire alarm device and the telephone device is reduced. Furthermore, calls with the first telephone handset or the second telephone handset can be commonly made using the same telephone master unit, and call operations can be performed simply and easily without changing the location.

Brief Description of the Drawings

[0016] [Figure 1] Explanatory drawing showing an embodiment of a fire alarm device having a call control function [Figure 2] Block diagram showing an embodiment of the telephone repeater in FIG. 1 [Figure 3]Block diagram showing an embodiment of a main telephone unit circuit section and a call detection circuit section provided in the receiver of FIG. 1 [Figure 4] Time chart showing call control for designating and calling a telephone sub-unit by a main telephone unit [Figure 5] Time chart showing call control between a main telephone unit and a telephone sub-unit when the telephone sub-unit goes off-hook [Figure 6] Time chart showing call control when a telephone sub-unit goes off-hook while another telephone sub-unit is in a call by the main telephone unit [Figure 7] Time chart showing call control when switching to receiving a call from another telephone sub-unit during a call between a main telephone unit and a telephone sub-unit [Figure 8] Time chart showing call control for a three-way call between a main telephone unit and two telephone sub-units [Figure 9] Time chart showing call control performed by connecting a maintenance telephone sub-unit to a telephone jack [Figure 10] Explanatory diagram showing an embodiment of a fire alarm device having a call control function for a special telephone device interlocked with an emergency broadcast facility and a maintenance telephone device used for maintenance and inspection [Embodiment for Carrying Out the Invention]

[0017] [Fire Alarm Device] (Outline of Fire Alarm Device with Call Control Function) FIG. 1 is an explanatory diagram showing an outline of a fire alarm device having a call control function. As shown in FIG. 1, for example, an R-type receiver 10 is installed in a superintendent's room on the first floor of a building where the fire alarm device is installed, and transmission lines 12a, 12b and telephone lines 16a, 16b are drawn out from the receiver 10 to a warning area.

[0018] Multiple fire detectors 14 and repeaters 15, each with a unique address and transmission function, are connected to transmission lines 12a and 12b. Furthermore, multiple telephone repeaters 18, each equipped with a telephone handset 20, are connected to transmission lines 12a and 12b and telephone lines 16a and 16b. Each telephone repeater 18 has a unique address and possesses both transmission and call control functions. A telephone base unit 28 is provided in the receiver 10 to correspond to the telephone handset 20. Telephone lines 16a and 16b ensure the transmission quality of voice signals within the audible voice frequency band of 300-3400Hz.

[0019] Here, the maximum number of addresses that can be set for the fire detectors 14, repeaters 15, and telephone repeaters 18 connected to the transmission lines 12a and 12b is, for example, 255, and terminal equipment including a maximum of 255 fire detectors 14, repeaters 15, and telephone repeaters 18 can be connected to the transmission lines 12a and 12b.

[0020] A transmitter 36 is connected to the repeater 15. The transmitter 36 is equipped with a transmitter button 36a. When the transmitter button 36a is pressed in the event of a fire, a transmission signal is output to the repeater 15. The repeater 15 then transmits a fire alarm signal to the receiver 10 via transmission lines 12a and 12b, and a fire alarm is output.

[0021] Furthermore, the transmitter 36 is equipped with a telephone jack 38, which is connected to telephone lines 16a and 16b. When the plug 42 of the maintenance telephone handset 40 carried by the person in charge is plugged into the telephone jack 38, the maintenance telephone handset 40 is connected to telephone lines 16a and 16b, establishing a communication connection with the telephone base unit 28 located in the receiver 10, and enabling communication.

[0022] (Functional configuration of the receiver) The receiver 10 includes a reception control unit 22, a transmission unit 24, a telephone base station circuit unit 26, a telephone base station 28, a display 30 with a touch panel, a display unit 31, an operation unit 32, an alarm unit 33 equipped with a speaker, a transmission unit 34, and a call detection circuit unit 35.

[0023] The receiving control unit 22 is a computer circuit equipped with a CPU, memory, various input / output ports, etc. The transmission unit 24 transmits and receives signals to and from the fire detectors 14, repeaters 15, or telephone repeaters 18 connected to the transmission lines 12a and 12b according to a predetermined communication protocol.

[0024] Downlink signals from the transmission unit 24 to the fire detector 14, repeater 15, or telephone repeater 18 are transmitted in voltage mode. These voltage-mode signals are transmitted as voltage pulses that change the line voltage of the transmission lines 12a and 12b between, for example, 18 volts and 30 volts.

[0025] In contrast, the uplink signal from the fire detector 14, repeater 15, or telephone repeater 18 to the receiver 10 is transmitted in current mode. In this current mode, a signal current is passed through the transmission lines 12a and 12b at the timing of bit 1 of the transmitted data, and the uplink signal is transmitted to the receiver as a so-called current pulse train.

[0026] (Fire Monitoring and Control Unit) The receiver control unit 22 of the receiver 10 is equipped with the function of a fire monitoring control unit 44, which is implemented by the execution of a program by the CPU.

[0027] During normal monitoring, the fire monitoring control unit 44 instructs the transmission unit 24 at regular intervals to send a broadcast batch AD conversion signal including a batch AD conversion command. Upon receiving this batch AD conversion signal, the fire detector 14 detects and stores smoke concentration or temperature as sensor data, and the repeater 15 detects and stores the transmitter signal at that time. Subsequently, the fire monitoring control unit 44 sends a call signal including a polling command that sequentially specifies terminal addresses.

[0028] When the fire detector 14 receives a call signal with an address matching its own address, it sends a response signal to the receiver 10 that includes the sensor data it currently holds. In addition, when the fire detector 14 detects a fire, it sends a fire interrupt signal to the receiver 10.

[0029] When the repeater 15 receives a call signal with an address matching its own address, it transmits a response signal to the receiver 10 that includes the transmitter signal it is currently holding. Also, when the repeater 15 receives a transmitter signal that has been turned on by pressing the transmitter button 36a of the transmitter 36, it transmits a fire interrupt signal to the receiver 10 as a fire alarm signal, similar to the fire detector 14.

[0030] When the fire monitoring control unit 44 receives a fire interrupt signal via the transmission unit 24, it sends a group search command signal to identify a group including the fire detectors 14 and repeaters 15 that have detected a fire. Subsequently, it sends an in-group search command signal to identify the address of the fire detector 14 or repeater 15 that has detected the fire, outputs a fire alarm, and displays the fire occurrence address or transmitter address. After that, it performs control to collect and monitor fire data from the identified fire detectors 14 or repeaters 15.

[0031] (Telephone base unit control unit) The receiver control unit 22 of the receiver 10 is equipped with the functions of the telephone base station control unit 46, which are realized by the execution of a program by the CPU.

[0032] The telephone base unit control unit 46 instructs the transmission unit 24 to send and receive various command signals necessary for call control with the telephone repeater 18 via transmission lines 12a and 12b, and controls call connection and call disconnection (call termination) between the telephone base unit 28 and the telephone handset 20 via telephone lines 16a and 16b.

[0033] The call control performed by the telephone base station control unit 46 in this embodiment is as follows: (1) Call control by specifying a cordless phone handset. (2) Call control via a call from a cordless phone handset. (3) Control of switching calls when a call comes in from another cordless phone handset while a call is in progress with the current handset. (4) Control of three-way calls between the base telephone unit and two cordless telephone handsets. (5) Call control by connecting a maintenance telephone handset to the telephone jack.

[0034] Of these, call control methods (1) to (4) use command signals such as the call initiation command signal, call answer command signal, hold command signal, and call in progress command signal. The call initiation command signal is a signal that requests the cordless phone to initiate a call. The call answer command signal is a signal that is sent when the cordless phone goes off-hook after receiving the call initiation command signal. The hold command signal is a signal that instructs the cordless phone to output a hold tone. The call in progress command signal is a signal that instructs the cordless phone to output a call in progress tone. Details of communication control using such command signals will be explained later.

[0035] (Call detection circuit section) The call detection circuit unit 35 in the receiver 10 detects the current flowing when the plug 42 of the maintenance telephone handset 40 is plugged into the telephone jack 38 of the transmitter 36 and connected to the telephone lines 16a and 16b, and outputs a call detection signal to the receiving control unit 22.

[0036] When the telephone base unit control unit 46, located in the receiving control unit 22, receives a call detection signal from the call detection circuit unit 35, it outputs a ringing tone from the speaker of the alarm unit 33 based on the call connection of the maintenance telephone handset 40. Upon hearing this, the person in charge picks up the telephone base unit 28, and based on the detection that the telephone base unit 28 is off-hook, the telephone base unit circuit unit 26 controls the telephone base unit 28 to connect to telephone lines 16a and 16b and establish a call connection with the maintenance telephone handset 40.

[0037] [Configuration of a telephone repeater] Figure 2 is a block diagram showing an embodiment of the telephone repeater shown in Figure 1. As shown in Figure 2, the circuit section of the telephone repeater 18 includes a telephone handset control unit 48 and a transmission unit 50 as the circuit section on the transmission lines 12a and 12b, and a connection switching unit 52, a control sound generation unit 54, a pair of switch circuit sections 56, a transformer 58, a hook switch 60, and a speaker 61 as the circuit section on the telephone lines 16a and 16b, and the telephone handset 20 is equipped with a handset 45 and a transmitter 47.

[0038] The telephone handset control unit 48 is composed of a computer circuit equipped with a CPU, memory, various input / output ports, etc., and the functions of the telephone handset control unit 48 are realized by the execution of a program by the CPU.

[0039] The call control performed by the telephone handset control unit 48 in this embodiment is as follows: (1) Call control via the telephone base unit. (2) Call control via a call from the base telephone unit. (3) Call switching control by the base phone ringing while a call is in progress with another cordless phone handset. (4) Control of three-way calls between the base telephone unit and two cordless telephone handsets.

[0040] These call control methods use command signals such as call initiation command signals, incoming call answering command signals, hold command signals, and call in progress command signals. Details of call control will be explained later.

[0041] The transmission unit 50 transmits and receives various command signals necessary for call control to and from the transmission unit 24 of the receiver 10 shown in Figure 1 via transmission lines 12a and 12b, following the same communication protocol as in the case of fire monitoring. The transmission unit 50 also receives downlink signals from the receiver 10 in voltage mode and transmits uplink signals to the receiver 10 in current mode.

[0042] The connection switching unit 52 operates according to the instructions of the telephone handset control unit 48, turning on and off a switch circuit unit 56 that uses relay contacts, semiconductor switch elements, etc., to connect and disconnect the telephone handset 20 to the telephone lines 16a and 16b.

[0043] The control sound generation unit 54 operates according to instructions from the telephone handset control unit 48, generating audio signals such as predetermined line connection tones, ringing tones for the telephone base unit, hold tones, and call tones, and outputting them to the handset 47 of the telephone handset 20. It also generates a ringing audio signal in response to a call from the telephone base unit and outputs it to the speaker 61.

[0044] The transformer 58 has its primary winding connected to telephone lines 16a and 16b, and its secondary winding connected to the handset 45. It extracts only the AC voice signal from the telephone lines 16a and 16b, which have a predetermined DC voltage superimposed on them, and amplifies it, while also preventing howling. The transmitter 47 of the cordless phone unit 20 is connected to the telephone lines 16a and 16b.

[0045] The hook switch 60 detects whether the telephone handset 20 is off-hook or on-hook and outputs an off-hook detection signal or an on-hook detection signal to the telephone handset control unit 48.

[0046] Note that the telephone circuits on the telephone lines 16a and 16b in Figure 2 represent basic analog telephone circuits and are not limited to them. Voice amplifiers may be provided as needed, and furthermore, the circuit may be a digital telephone circuit that receives a digital voice signal, performs DA conversion and outputs it to the handset 45, and performs AD conversion of the voice signal from the transmitter 47 and transmits it.

[0047] [Configuration of the receiver's telephone base station circuit and call detection circuit] Figure 3 is a block diagram showing an embodiment of the telephone base station circuit and call detection circuit provided in the receiver shown in Figure 1.

[0048] (Telephone base station circuit section) As shown in Figure 3, the telephone base station circuit unit 26 is equipped with a connection switching unit 62, a control sound generation unit 64, a pair of switch circuit units 66, a transformer 68, and a hook switch 70, while the telephone base station 28 is equipped with a handset 72 and a transmitter 74. The telephone base station circuit unit 26 applies a telephone line voltage Vt, for example, DC 48V, between the telephone lines 16a and 16b.

[0049] The connection switching unit 62 operates according to the instructions of the telephone base unit control unit 46 in Figure 1, turning the switch circuit unit 66 on and off, and connecting and disconnecting the telephone lines 16a and 16b of the telephone base unit 28.

[0050] The control sound generation unit 64 operates according to instructions from the telephone base unit control unit 46 and generates audio signals such as predetermined line connection tones, ringing tones indicating calls from the telephone handset 20, hold tones, and call-in tones, which it outputs to the handset 72 of the telephone base unit 28. It also generates a ringing audio signal in response to calls from the telephone handset 20 or the maintenance telephone handset 40 and outputs it, for example, to a speaker provided in the alarm unit 33.

[0051] The transformer 68 has its primary winding connected to telephone lines 16a and 16b, and its secondary winding connected to the handset 72. It extracts only the AC voice signal from telephone lines 16a and 16b, which are superimposed with a predetermined telephone line voltage Vt, to the handset 72, amplifies it, and also prevents howling. The transmitter 74 of the telephone base unit 28 is connected to the telephone lines 16a and 16b.

[0052] The hook switch 70 detects whether the telephone base unit 28 is off-hook or on-hook and outputs an off-hook detection signal or an on-hook detection signal to the telephone base unit control unit 46.

[0053] Note that the telephone circuits on the telephone lines 16a and 16b in Figure 3 represent basic analog telephone circuits, similar to the telephone repeater 18 in Figure 2. However, they are not limited to these, and voice amplifiers may be added as needed, or even digital telephone circuits may be used.

[0054] (Call detection circuit section) As shown in Figure 3, in the call detection circuit 35, resistors 76, 78, and 80 are connected in series between a telephone line 16a to which a predetermined line voltage Vt is applied and a telephone line 16b which is the negative side. The telephone line 16a is drawn out to the terminal side from between resistors 76 and 78, and a call detection signal is taken from between resistors 78 and 80 and output to the receiving control unit 22.

[0055] As shown in Figure 1, when the plug 42 of the maintenance telephone handset 40 is inserted into the telephone jack 38 of the transmitter 36 and the maintenance telephone handset 40 is connected between the telephone lines 16a and 16b, the maintenance telephone handset 40 also has a telephone circuit equipped with a transformer, handset and transmitter, just like the telephone handset 20 shown in Figure 2 or the telephone base unit 28 shown in Figure 3. Therefore, when the transmitter is connected between the telephone lines 16a and 16b via the primary winding of the transformer, a predetermined line current flows.

[0056] The line current generated when the maintenance telephone 40 is connected to the telephone jack 38 flows through the resistor 76 of the call detection circuit 35 shown in Figure 3 to the telephone line 16a. The line voltage drops by the amount of the voltage drop across resistor 76, and the detection voltage output as a call detection signal divided by resistors 78 and 80 also decreases. The telephone base unit control unit 46 of the receiving control unit 22 determines the connection of the maintenance telephone handset 40 from the decrease in the level of the call detection signal, and outputs a ringtone and displays a screen indicating that the maintenance telephone handset 40 is calling.

[0057] [Call control between the base phone unit and the cordless phone unit] (Designating a call on a cordless phone from the base phone unit) Figure 4 is a time chart showing call control in which a telephone base unit designates and calls a telephone handset. The control operation is performed by the telephone base unit control unit 46 of the receiver 10 shown in Figure 1 and the telephone handset control unit 48 of the telephone repeater 18 shown in Figure 2.

[0058] When an officer picks up the telephone base unit 28 to contact another officer in the restricted area, an off-hook detection signal is output from the hook switch 70. As shown in Figure 4, the telephone base unit control unit 46 determines that the telephone base unit 28 is off-hook in step S1 and proceeds to step S2, where it displays the handset call screen on the display 30 and simultaneously instructs the control sound generation unit 64 to output a line connection tone, such as a continuous "beep" sound, from the handset 72 of the telephone base unit 28.

[0059] In step S2, the cordless phone call screen displayed on the display 30 shows key buttons arranged as 0, 1-9, #, and *. When a cordless phone call operation is performed by touching the telephone number of the cordless phone to be called, the base unit control unit 46 recognizes the cordless phone call operation in step S3 and proceeds to step S4, instructing the transmission unit 24 to send a call command signal specifying the repeater address corresponding to the called telephone number to the transmission lines 12a and 12b. At this time, the base unit 28 outputs a ringing tone to the cordless phone.

[0060] When the telephone handset control unit 48 of the telephone repeater 18 receives a call command signal specifying its own address via the transmission unit 50 through the transmission lines 12a and 12b, in step S5 it instructs the control tone generation unit 54 to output a ringtone from the speaker 61 to perform a call.

[0061] When the person in charge at the site picks up the telephone handset 20 in response to this call, the off-hook status is detected in step S6 by the off-hook detection signal from the hook switch 60, and in step S7, the transmission unit 50 is instructed to send a call response command signal including its own address to the receiver 10 via the transmission lines 12a and 12b. Subsequently, in step S8, the connection switching unit 52 is instructed to turn on the switch circuit unit 56, and a call connection is made by connecting the telephone circuit unit on the telephone handset 20 side to the telephone lines 16a and 16b.

[0062] When the receiver 10's base station control unit 46 receives the incoming call response command signal transmitted from the telephone repeater 18 in step S7, it stops outputting the ringtone to the telephone handset 20, instructs the connection switching unit 62 in step S9 to turn on the switch circuit unit 66, and establishes a call connection by connecting the base station circuit unit 26 of the base station 28 to the telephone lines 16a and 16b.

[0063] This allows the base telephone unit 28 and the called telephone handset 20 to be connected to telephone lines 16a and 16b, enabling a call to be made. When the call ends, the base telephone unit 28 and the telephone handset 20 are returned, on-hook status is detected in step S10 or S12, and the call is cut off in step S11 or S13, disconnecting them from telephone lines 16a and 16b and ending the call.

[0064] (Calling the base phone using the cordless phone handset) Figure 5 is a time chart showing call control when a telephone handset calls the telephone base unit. When an officer in the security area picks up the telephone handset 20 to contact the receiver 10, an off-hook detection signal is output from the hook switch 60. As shown in Figure 5, the telephone handset control unit 48 determines that the telephone handset 20 is off-hook in step S21 and proceeds to step S22, instructing the control sound generation unit 54 to output a line connection tone, such as a continuous "beep" sound, from the receiver 45 of the telephone handset 20.

[0065] Next, in step S23, the telephone handset control unit 48 instructs the transmission unit 50 to send a call command signal including its own address to the receiver 10 via transmission lines 12a and 12b. At this time, the telephone handset 20 outputs a ringing tone to the telephone base unit 28.

[0066] When the telephone base unit control unit 46 of the receiver 10 receives a call command signal including the repeater address via the transmission unit 50 through the transmission lines 12a and 12b, it instructs the alarm unit 33 in step S24 to output a ringtone from the speaker to initiate a call. Subsequently, it proceeds to step S25 to display the handset call screen on the display 30 and displays the telephone number of the calling handset, etc.

[0067] When the operator receives the ringing tone in step S24 and picks up the telephone base unit 28 located in the receiver 10, the telephone base unit control unit 46 determines in step S26 that the telephone base unit 28 is off-hook, instructs the transmission unit 24 in step S27 to send an incoming call response command signal specifying the relay address that made the call to the transmission lines 12a and 12b, and in step S28 instructs the connection switching unit 62 to turn on the switch circuit unit 66, thereby connecting the telephone base unit 28 to the telephone lines 16a and 16b for a call.

[0068] Meanwhile, when the telephone handset control unit 48 receives a call answer command signal specifying its own address transmitted from the receiver 10 in step S27, it stops the ringing tone to the telephone base unit 28 and proceeds to step S29, instructing the connection switching unit 52 to turn on the switch circuit unit 56, thereby connecting the telephone handset 20 to the telephone lines 16a and 16b for a call.

[0069] This allows the cordless phone handset 20 and the called base phone unit 28 to be connected to telephone lines 16a and 16b, enabling a conversation. When the conversation ends, the cordless phone handset 20 and base phone unit 28 are returned, on-hook status is detected in step S30 or S32, and the call is disconnected from telephone lines 16a and 16b in step S31 or S33, ending the call connection.

[0070] (Calling from a cordless phone while the base phone is in use) Figure 6 is a time chart showing call control when a cordless phone goes off-hook while the base phone is in a call with another cordless phone.

[0071] As shown in Figure 4, during a call from the base telephone unit, or as shown in Figure 5, during a call from the base telephone unit, the base telephone unit control unit 48 of another telephone repeater 18 detects in step S41 that the base telephone unit 20 is off-hook, outputs a line connection tone from the base telephone unit 20 in step S42, and then in step S43 transmits a call command signal including its own address to the receiver 10 via transmission lines 12a and 12b, causing the alarm unit 33 to output a ring tone from its speaker.

[0072] In this case, the telephone base unit control unit 46 of the receiver 10 receives a call command signal transmitted from the telephone repeater 18 in step S43, but in step S44 it determines that it is in a call with another telephone handset, and in step S45 it displays a new handset call on the handset call screen on the display 30, and then in step S46 it sends a call in progress command signal to the transmission lines 12a and 12b specifying the address of the telephone repeater 18 that sent the call command signal.

[0073] When the telephone handset control unit 48 of the telephone repeater 18 receives a call command signal specifying its own address via the transmission lines 12a and 12b, in step S47 it instructs the control tone generation unit 54 to output a predetermined call tone from the handset 45 of the telephone handset 20.

[0074] Therefore, the person who picked up the cordless phone handset 20 realizes that the base phone unit 28 is in use and puts the handset back, and the cordless phone handset control unit 48 detects that it is on hook in step S48 and terminates the call connection.

[0075] (Call switching due to another cordless phone ringing while a call is in progress between the base unit and another cordless phone.) Figure 7 is a time chart showing call control when a call is received from another cordless phone while a call is in progress between the base phone and a cordless phone. Here, the first cordless phone repeater 18 that made the initial call is designated as cordless phone repeater 18-1, the next cordless phone repeater 18 that made the subsequent call is designated as cordless phone repeater 18-2, the cordless phone control units 48 provided in each are designated as cordless phone control units 48-1 and 48-2, and the cordless phone units 20 are designated as cordless phone units 20-1 and 20-2.

[0076] As shown in Figure 7, a call is initiated from the telephone handset control unit 48-1 of the telephone repeater 18-1, and a call is established between the telephone base unit 28 and the telephone handset 20-1 through call control between the telephone base unit control unit 46 of the receiver 10. The call control in steps S51 to S59 in this case is the same as steps S21 to S29 in Figure 5, so the explanation is omitted.

[0077] Next, when the telephone handset control unit 48-2 of another telephone repeater 18-2 detects that the telephone handset 20-2 has been hooked off in step S60, it outputs a line connection tone from the telephone handset 20-2, and then in step S61, the telephone base unit 28 transmits a call command signal including its own address to the receiver 10, which is currently on a call, via the transmission lines 12a and 12b.

[0078] When the telephone base unit control unit 46 of the receiver 10 receives a call command signal transmitted from the telephone repeater 18-2, in step S62 it displays the call of the telephone handset 20-2 on the display 30 and simultaneously outputs a predetermined warning sound from the speaker of the alarm unit 33.

[0079] As a result, when the person on the call learns that there is a call coming from another telephone handset 20-2 and makes a selection operation, the telephone base unit control unit 46 recognizes the selection operation of the other telephone handset 20-2 in step S63 and proceeds to step S64, where it sends an incoming call response command signal specifying the address of the telephone repeater 18-2 to the transmission lines 12a and 12b, which is received by the telephone repeater 18-2, and the telephone handset control unit 48-2 connects the telephone handset 20-2 to the telephone lines 16a and 16b in step S65.

[0080] Furthermore, in step S66, the base station control unit 46 sends a hold command signal to the transmission lines 12a and 12b specifying the address of the telephone repeater 18-1 of the telephone handset 20-1 that was in use for a call. This signal is received by the telephone repeater 18-1, and in step S67, the telephone handset control unit 48-1 disconnects the telephone handset 20-1 from the telephone lines 16a and 16b, and simultaneously outputs a predetermined hold tone from the telephone handset 20-1.

[0081] Subsequently, when the call between the base telephone unit 28 and the handset 20-2 ends and the handset control unit 48-2 determines in step S68 that the handset is on-hook, it proceeds to step S69, where it sends a call termination command signal including its own address to the transmission lines 12a and 12b.

[0082] When the base station control unit 46 detects the reception of a call termination command signal from the telephone repeater 18-2, in step S70 it sends a hold release command signal specifying the address of the telephone repeater 18-1 that is on hold to the transmission lines 12a and 12b. When the handset control unit 48-1 receives the hold release command signal specifying its own address, in step S71 it stops the output of the hold tone from the handset 20-1, reconnects the handset 20-1 to the telephone lines 16a and 16b, and resumes the call with the base station 28.

[0083] (3-way call) Figure 8 is a time chart showing call control for a three-way call using a base telephone unit and two cordless telephone handsets. Similar to Figure 7, the two telephone repeaters 18, the cordless telephone handsets 20, and the cordless telephone handset control unit 48 that perform the three-way call are designated as telephone repeaters 18-1 and 18-2, cordless telephone handsets 20-1 and 20-2, and cordless telephone handset control units 48-1 and 48-2, respectively.

[0084] In the three-way call shown in Figure 8, the control in steps S81 to S92 is the same as in steps S51 to S62 shown in Figure 7, so the explanation is omitted.

[0085] In the three-way call shown in Figure 8, if a call command signal is sent from the telephone repeater 18-2 of another telephone handset 20-2 while the telephone base unit 28 and telephone handset 20-1 are connected, and the call from telephone handset 20-2 is displayed on the display 30 in step S92, a three-way call selection button will appear on the display screen, allowing the user to select a three-way call.

[0086] Therefore, when the telephone base unit control unit 46 recognizes the selection operation for a three-way call in step S93, it proceeds to step S94, where an incoming call command signal specifying the address of the telephone repeater 18-2 that sent the outgoing call command signal is sent to the transmission lines 12a and 12b. Upon receiving this, the telephone handset control unit 48-2 connects the telephone handset 20-2 to the telephone lines 16a and 16b in step S95.

[0087] Next, in step S96, the base station control unit 46 sequentially transmits a three-way call command signal specifying the addresses of the telephone repeaters 18-1 and 18-2 to the transmission lines 16a and 16b. Upon receiving this, the telephone handset control units 48-1 and 48-2 output a predetermined message from the telephone handsets 20-1 and 20-2 in steps S97 and S98 to indicate the start of a three-way call. This enables the three-way call described in step S99 of the base station control unit 46 and steps S100 and S101 of the telephone handset control units 48-1 and 48-2 to be performed by connecting the base station 28 and the telephone handsets 20-1 and 20-2 to the telephone lines 16a and 16b.

[0088] Here, by connecting multiple cordless telephones 20 in addition to the base telephone unit 28 to telephone lines 16a and 16b, it is possible to have four-way calls, five-way calls, etc. However, as the number of telephones connected to telephone lines 16a and 16b increases, the level of the voice signal transmitted by telephone lines 16a and 16b decreases, and the call quality deteriorates. Therefore, a three-way call is optimal, where three telephones, each with two cordless telephones connected to the base telephone unit 28 (which has minimal voice level degradation), are connected to telephone lines 16a and 16b.

[0089] (Call control performed by connecting a maintenance telephone handset to the telephone jack) Figure 9 is a time chart showing call control performed by connecting an emergency telephone handset to the telephone jack.

[0090] As shown in Figure 9, when the person carrying the maintenance telephone handset 40 plugs the plug 42 of the maintenance telephone handset 40 into the telephone jack 38 of the transmitter 36 in step S111 to contact the receiver 10, the maintenance telephone handset 40 is connected to the telephone lines 16a and 16b, and line current flows. The call detection circuit unit 35 of the receiver 10 detects a drop in line voltage in step S112 and outputs a call detection signal to the telephone base unit control unit 46.

[0091] Upon receiving a call detection signal from the call detection circuit unit 35, the telephone base unit control unit 46 instructs the alarm unit 33 in step S113 to output a ringtone from the speaker, thereby initiating a call. Subsequently, in step S114, the system displays the call from the maintenance telephone handset 40 on the display 30 to provide notification.

[0092] When the person in charge picks up the telephone base unit 28 located in the receiver 10 after receiving the ringing tone in step S113, the telephone base unit control unit 46 determines in step S115 that the telephone base unit 28 is off-hook, and in step S116 instructs the connection switching unit 62 to turn on the switch circuit unit 66, thereby connecting the telephone base unit 28 to the telephone lines 16a and 16b, and establishing a call connection with the maintenance telephone handset 40.

[0093] When the call ends, the base telephone unit 28 is returned, and in step S117 the base telephone unit control unit 46 determines that the base telephone unit 28 is on hook, and in step S118 the call disconnects from the telephone lines 16a and 16b, ending the call connection.

[0094] Furthermore, when the call ends, the maintenance telephone handset 40 is removed from the telephone jack 38 in step S119, disconnecting it from the telephone lines 16a and 16b. In step S120, this restores the line voltage in the call detection circuit 35, and the output of the notification detection signal stops.

[0095] [Fire alarm system equipped with emergency telephone equipment and maintenance telephone equipment] (Overview of facilities) Figure 10 is an explanatory diagram showing an embodiment of a fire alarm system equipped with call control functions for emergency telephone equipment linked to emergency broadcasting equipment and maintenance telephone equipment used for maintenance and inspection.

[0096] As shown in Figure 10, the receiver 10 extends transmission lines 12a and 12b for the fire alarm system, emergency telephone lines 16c and 16d for the emergency telephone system, and maintenance telephone lines 84a and 84b for the maintenance telephone system to the protected area.

[0097] Multiple fire detectors 14, repeaters 15, and addressable transmitters 37, each with a unique address and transmission function, are connected to transmission lines 12a and 12b. In addition, multiple telephone repeaters 18, each equipped with an emergency telephone handset 20a, are connected to transmission lines 12a and 12b and emergency telephone lines 16c and 16d. Each telephone repeater 18 has a unique address and possesses both transmission and call control functions.

[0098] Furthermore, transmitters 36 are connected to the repeaters 15 of the transmission lines 12a and 12b. The transmitter 36 is equipped with a transmitter button 36a, and when the transmitter button 36a is pressed in the event of a fire, a transmission signal is output to the repeater 15, and a fire alarm signal is transmitted from the repeater 15 to the receiver 10 via the transmission lines 12a and 12b, and a fire alarm is output.

[0099] The transmitter 36 is equipped with a telephone jack 38, which is connected to maintenance telephone lines 84a and 84b. When the plug 42 of the maintenance telephone handset 40a carried by the person in charge is inserted into the telephone jack 38, the maintenance telephone handset 40a is connected to the maintenance telephone lines 84a and 84b, establishing a communication connection with the telephone base unit 28 located in the receiver 10, and enabling communication.

[0100] The addressable transmitter 37 is also equipped with a transmitter button 37a, similar to the transmitter 36. When the transmitter button 37a is pressed in the event of a fire, a fire alarm signal is transmitted from the transmission unit 37b to the receiver 10 via transmission lines 12a and 12b, and a fire alarm is output.

[0101] The addressable transmitter 37 is equipped with a telephone jack 38, similar to the transmitter 36, and the telephone jack 38 is connected to maintenance telephone lines 84a and 84b. When the plug 42 of the maintenance telephone handset 40a carried by the person in charge is plugged into the telephone jack 38, the maintenance telephone handset 40a is connected to the maintenance telephone lines 84a and 84b, establishing a communication connection with the telephone base unit 28 located in the receiver 10, and enabling communication.

[0102] The receiver 10 is equipped with a base telephone unit 28 to accommodate the emergency telephone handset 20a and the maintenance telephone handset 40a.

[0103] Furthermore, in this embodiment, in addition to the fire alarm system, an emergency broadcasting system is also provided. From the emergency broadcasting panel 90, which is installed in the same manager's room as the receiver 10, broadcasting lines 92 are drawn out to the protected area, for example, separated by floor-by-floor system, and broadcasting speakers 94 are connected to the broadcasting lines 92.

[0104] (Functional configuration of the receiver) The receiver 10 includes a receiving control unit 22, a transmission unit 24, an emergency telephone master unit circuit unit 26a, a maintenance telephone master unit circuit unit 26b, a telephone master unit 28, a display 30 with a touch panel, a display unit 31, an operation unit 32, an alarm unit 33 equipped with a speaker, a transmission unit 34, a call detection circuit unit 35, and a switching unit 82.

[0105] The receiver control unit 22 of the receiver 10 is equipped with the functions of the telephone base station control unit 46, which are realized by the execution of a program by the CPU. The fire monitoring control unit 44 is the same as in the embodiment shown in Figure 1, so its description is omitted.

[0106] (Telephone base unit control unit) The telephone base unit control unit 46 controls incoming calls to the emergency telephone handset 20a, to the maintenance telephone handset 40a, and to control calls when incoming calls to the emergency telephone handset 20a and the maintenance telephone handset 40a overlap.

[0107] The telephone repeater 18 is the same as shown in Figure 2, and the call detection circuit unit 35 is the same as in Figure 3. The emergency telephone master unit circuit unit 26a and the maintenance telephone master unit circuit unit 26b are basically the same as the telephone master unit circuit unit 26 in Figure 3, but they differ in that a switching unit 82 is provided between them and the master telephone 28, switching the master telephone 28 to the emergency telephone master unit circuit unit 26a when an emergency call is received, and switching the master telephone 28 to the maintenance telephone master unit circuit unit 26b when a maintenance call is received.

[0108] [Call control] The telephone base unit control unit 46 displays the operation necessary for controlling a call with the telephone base unit 28 on the display 30 based on the call command signal including the source address from the emergency telephone handset 20a via the telephone repeater 18 and repeater 15, and / or based on the call detection signal from the call detection circuit unit 35, and performs the following call control based on screen operation, etc.

[0109] (Incoming call from maintenance department) When an inspection worker plugs the plug 42 of the maintenance telephone handset 40a, which they carry with them during a regular inspection, into the telephone jack 38 of the transmitter 36 or addressable transmitter 37 and connects it to the maintenance telephone lines 84a and 84b, the call detection circuit 35 of the receiver 10 detects the line current flowing through the connection of the maintenance telephone handset 40a and outputs a call detection signal to the telephone base unit control unit 46.

[0110] Upon receiving a call detection signal from the call detection circuit unit 35, the telephone base unit control unit 46 displays an incoming maintenance call on the display 30, outputs a predetermined maintenance call ringtone (maintenance call tone) from the speaker of the alarm unit 33, and switches the telephone base unit 28 to the maintenance telephone base unit circuit unit 26b using the switching unit 82.

[0111] When a disaster prevention manager or other person on the receiver 10 side learns of such an incoming maintenance call and picks up the telephone base unit 28, the telephone base unit 28, based on the off-hook detection of the telephone base unit 28, connects to the maintenance telephone handset 40a that made the call via the maintenance telephone base unit circuit 26b and maintenance telephone lines 84a, 84b, and the necessary conversation can be made.

[0112] (Emergency phone call received) If a monitor or other person discovers a fire while on patrol, they pick up the emergency telephone handset 20a located nearby, which activates the hook switch. This sends a call command signal, including the caller's address, to the receiver 10 via the telephone repeater 18 and repeater 15. Upon receiving the call command signal from the emergency telephone handset 20a, the telephone base unit control unit 46 of the receiver 10 displays the incoming emergency telephone call on the display 30 along with the caller's location based on the caller's address. The alarm unit 33 outputs a predetermined emergency telephone ringtone (emergency telephone call tone) from its speaker, and the telephone base unit 28 is switched to the emergency telephone base unit circuit unit 26a by the switching unit 82.

[0113] When a disaster prevention manager or other person on the receiver 10 side learns of an incoming emergency call and picks up the base telephone unit 28, the base telephone unit 28, based on the off-hook detection of the base telephone unit 28, connects to the cordless telephone handset 20a that made the call via the emergency telephone lines 16c and 16d, and the necessary conversation can be made.

[0114] Furthermore, when the telephone master control unit 46 of the receiver 10 receives a call command signal from the emergency telephone handset 20a via the telephone repeaters 18 and 15, it instructs the transmission unit 34 to output a fire alarm transmission signal to the emergency broadcast panel 90, including the fire area based on the originating address, within a predetermined time, for example, within 10 seconds.

[0115] Upon receiving a fire alarm signal from the receiver 10, the emergency broadcast panel 90 designates the floor where the fire occurred and the floor directly above it as broadcasting areas and broadcasts a fire alarm. This fire alarm broadcast may say, for example, "Fire! Fire! A fire has broken out in the XX area. Please remain calm and evacuate." After a predetermined time has elapsed since the start of the emergency broadcast, the emergency broadcast panel 90 will broadcast an emergency alarm to all broadcasting areas throughout the entire building.

[0116] (Duplicate calls to emergency phones) Furthermore, if multiple emergency telephone handsets 20a attempt to make an incoming call, the telephone base unit control unit 46 of the receiver 10 displays multiple call sources on the display 30 and controls the system to establish a call connection with the emergency telephone handset 20a of the call source selected by the user via the screen. At this time, it controls the system to output a hold tone from any emergency telephone handsets that were not selected.

[0117] (Duplicate incoming calls from emergency and maintenance phones) Furthermore, if incoming calls to the emergency telephone handset 20a and the maintenance telephone handset 40a overlap, the telephone base unit control unit 46 of the receiver 10 displays the incoming call for the emergency telephone and the maintenance telephone on the display 30, and controls the system to connect to the emergency telephone handset 20a or the maintenance telephone handset 40a of the caller selected by the user via the screen. At this time, the system controls the system to output a hold tone from the telephone handset that was not selected. Alternatively, a priority can be set in advance for incoming calls to the emergency telephone and the maintenance telephone, and the system can select the incoming call with the higher priority to connect to the call.

[0118] (Another form of display for emergency and maintenance telephones) In addition, incoming calls to the emergency telephone handset 20a may be displayed on the display 30, and incoming calls to the maintenance telephone handset 40a may be displayed by a maintenance telephone light located inside the panel. Since the emergency telephone handset 20a transmits an emergency telephone outgoing signal that includes a unique caller address, its installation location can be recognized, so it is preferable to indicate the caller on the display 30.

[0119] (Communication of location identification information when connecting a maintenance telephone handset) When the maintenance telephone handset 40a is connected to the transmitter 36 or addressable transmitter 37, the transmitter 36 or addressable transmitter 37 may detect the plug connection and transmit address information on the transmission circuit to the receiver 10. The receiver 10 may then display information that identifies the transmitter 36 or addressable transmitter 37 to which the maintenance telephone handset 40a is connected. Enabling the display of the caller ID for either the emergency telephone handset 20a or the maintenance telephone handset 40a can help determine which call to prioritize.

[0120] [Modified version of the present invention] (Telephone hijacking) The above embodiment uses the example of a transmitter equipped with a telephone jack, but a telephone jack may be provided on an appropriate terminal device as needed. Furthermore, the maintenance telephone equipment is not limited to portable types, but may also be a maintenance telephone handset that is fixedly installed in the controlled area and plugged into a telephone jack.

[0121] Alternatively, the telephone jack may be provided on the receiver 10. For example, the positive and negative sides of the telephone jack can be connected via capacitors between the telephone lines 16a and 16b that are drawn out from the call detection circuit unit 35 shown in Figure 3 to the terminal side. In this case, a call connection between the maintenance telephone handsets can be established by plugging in the telephone jacks of the receiver and the telephone jacks of the transmitter, respectively.

[0122] (Priority for maintenance cordless phones and hold music for cordless phones) In the above embodiment, when the telephone base unit control unit 46 detects a connection of the maintenance telephone unit 40 to the telephone jack 38 while the telephone base unit 28 is connected to any of the emergency telephone units 20, it notifies the telephone call of the maintenance telephone unit 40a, switches to the call connection of the maintenance telephone unit 40, and sends a hold command signal specifying the address of the telephone relay unit 18 of the emergency telephone unit 20 that is on a call, disconnects the emergency telephone unit 20 from the telephone lines 16a and 16b, and outputs a predetermined hold tone.

[0123] This allows the maintenance telephone handset 40 to be connected to the telephone jack 38 while a call is in progress between the telephone base unit 28 and the emergency telephone handset 20, thereby prioritizing the call with the maintenance telephone handset 40 and putting the previous call connection between the telephone base unit 28 and the emergency telephone handset 20 on hold.

[0124] Alternatively, when the call between the base telephone unit 28 and the maintenance telephone handset 40 ends, the base telephone unit control unit 46 may send a hold release command signal specifying the address of the telephone relay unit 18 for the emergency telephone handset 20 that is currently on hold, thereby connecting the emergency telephone handset 20 to telephone lines 16a and 16b and restoring the call between the base telephone unit 28 and the emergency telephone handset 20.

[0125] (Calls between cordless phone handsets) The above embodiment takes the control of calls between a receiver's base unit and a cordless phone installed in a controlled area as an example, but is not limited to this. By providing an operation display unit that allows call calling by inputting a telephone number into the telephone repeater, it may be possible to enable calls between cordless phones by calling one cordless phone to another cordless phone.

[0126] (Hands-free calling function) The above embodiment uses a telephone base unit and a telephone handset as an example, but is not limited to this. In addition to the telephone base unit of the receiver and the telephone handset of the telephone repeater, a microphone and speaker may be installed on a panel surface near the telephone, and a hands-free calling function may be provided that allows the telephone to be switched to the microphone and speaker by operating a predetermined switch, enabling communication without using the telephone.

[0127] (Type P receiver) The above embodiment uses an example of a fire alarm system in which R-type fire detectors are connected via a transmission line from an R-type receiver. However, a similar communication control can be achieved in a fire alarm system in which addressable fire detectors equipped with a transmission function are connected to a detector line drawn out from a P-type receiver, by sending and receiving various command signals using the detector line.

[0128] (others) Furthermore, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of symbols]

[0129] 10: Receiver 12a, 12b: Transmission line 14: Fire detector 15: Repeater 16a, 16b: Telephone line 16c, 16d: Emergency telephone lines 18: Telephone repeater 20: Cordless phone 20a: Emergency phone handset 22: Receiving Control Unit 24,50: Transmission section 26: Telephone base station circuit section 26a: Emergency telephone master unit circuit section 26b: Maintenance telephone base station circuit section 28: Main telephone unit 30: Display 35: Call detection circuit section 36: Transmitter 37: Addressable Transmitter 38: Phone hijacking 40: Maintenance phone handset 40a: Maintenance phone handset 44: Fire Monitoring and Control Unit 46: Telephone base unit control unit 45,72: Handset 47,74:Telephone 48: Telephone handset control unit 52, 62: Connection switching section 54, 64: Control sound generation unit 56, 66: Switch circuit section 58,68: Trans 60, 70: Hook switch 61,94: Speaker 76, 78, 80: Resistors 82: Switching section 84a, 84b: Maintenance telephone lines 90: Emergency broadcast panel 92: Broadcast Line

Claims

[Claim 1] A transmission line connecting terminal equipment, including telephone relays, located in the restricted area, to a receiver, A first telephone line connecting the telephone repeater and the receiver, A second telephone line connecting the transmitter and receiver located in the aforementioned restricted area, A fire alarm system equipped with, The receiver stores address information that can identify the telephone repeater, and enables communication connections between the first telephone handset connected to the first telephone line and the second telephone line's call unit connected to the second telephone line via the telephone repeater. The receiver and the first telephone handset are connected by a call connection between the receiver and the first telephone handset and the telephone repeater to which the receiver and the first telephone handset are connected, through the transmission and reception control of a predetermined call control signal via the transmission line. The receiver and the communication unit for the second telephone line are connected by operation by an operator located near the transmitter. When an incoming call is received from the first telephone handset, the system displays an indication that an incoming call has been received, based on the address information of the telephone relay to which the first telephone handset is connected, thereby identifying the first telephone handset that is the source of the incoming call. A fire alarm system characterized by providing notification that an incoming call has been received from the second telephone line's telephone unit when an incoming call is received from the second telephone line's telephone unit.

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