Receiver and fire warning facility

Abstract

To reduce an installation space and improve operability of a call connection by allowing a receiver of a fire warning facility to incorporate a function of an emergency telephone facility without deteriorating a function of a maintenance telephone facility.SOLUTION: A receiver 10 includes: a maintenance telephone circuit section 62 for detecting an incoming call from a maintenance telephone slave unit 28 connected to a maintenance telephone line 24; an emergency telephone circuit section 64 for detecting an incoming call from each one of emergency telephone slave units 34 connected to an emergency telephone line 32; and a call control section 72 for controlling a call via the maintenance telephone line 24 and a call via the emergency telephone line 32, and performing predetermined call control when an incoming call from the maintenance telephone slave unit 28 is detected through the maintenance telephone line 24 and the incoming call from the emergency telephone slave unit 34 is detected through the emergency telephone line 32. The call control section 72 controls a call with a telephone slave unit, a call among three parties, and a call between two parties with the telephone slave units as the predetermined call control, through a predetermined operation to select the telephone slave unit to be connected for a call-connection by a person in the receiver 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fire alarm system that is installed in a security zone and is provided with an emergency phone that is picked up in the event of a fire and a maintenance phone that is used during maintenance and inspection, and a receiver that is provided in the fire alarm system. [Background technology]

[0002] Conventionally, fire alarm systems monitor fires using fire detectors connected to signal lines drawn from a receiver, and output a fire alarm when a fire occurs.

[0003] The fire alarm system is also equipped with a maintenance telephone facility. The maintenance telephone facility connects the maintenance telephone line drawn from the receiver to a telephone jack on the transmitter connected to the detector line, and when the maintenance personnel inserts the maintenance telephone handset they carry into the telephone jack on the transmitter, an incoming maintenance call is made to the receiver, and when the maintenance telephone base unit is picked up, a call is made to the maintenance telephone handset, allowing the necessary contact to be made with the person in charge on the receiver side.

[0004] In addition, facilities that are fire-prevention targets and that have emergency broadcast equipment installed are required to have emergency telephone equipment installed, and even in other facilities, emergency telephone equipment may be installed as necessary.

[0005] The emergency telephone equipment is equipped with emergency telephone handsets with the same functions as the transmitters in fire alarm systems, which are installed in the alert area. When the emergency telephone handset is picked up, a fire notification is automatically sent to the emergency telephone base unit, and an emergency broadcast is made to the necessary floors by the emergency broadcast equipment within a specified time. In addition, when the emergency telephone base unit is picked up in response to a call from the emergency telephone handset, a call can be made with the caller on the handset, and the fire situation can be confirmed. Furthermore, in the event that calls from multiple emergency telephone handsets overlap, the emergency telephone base unit has a function to select a call at will, so it can respond even if there are simultaneous calls. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-064709 A [Patent Document 2] JP 2017-004451 A [Patent Document 3] JP 2017-068523 A [Patent Document 4] Japanese Patent Application Publication No. 8-279859 [Patent Document 5] JP 2017-182417 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when a fire alarm system and an emergency telephone system with the functions of such a conventional maintenance telephone system are installed, when an incoming call from a maintenance telephone and an emergency telephone overlap, the operator of the receiver can only talk to one of them, so the other telephone call is ignored and the ringing state continues, which is bothersome because the operator must talk while the ringing voice is playing. Also, the other telephone handset that is not in use does not put the call on hold, so the caller does not know the situation and is stressed out over the handset.

[0008] Furthermore, since the receiver and emergency telephone base unit are installed separately, the installation space increases, and because calls from the fire alarm equipment transmitter and calls from the emergency telephone handset are displayed as separate fire calls, disaster prevention personnel must respond to the receiver and emergency telephone base unit separately, even though they are the same fire calls.In addition, when a call is made from a maintenance telephone handset, the maintenance telephone base unit must be picked up, and when a call is made from an emergency telephone handset, the emergency telephone base unit must be picked up and the caller must be spoken to, which can be time-consuming and cumbersome when operating and responding to an emergency such as a fire.

[0009] The present invention aims to provide a fire alarm system and its receiver that incorporates the functions of emergency telephone equipment into the receiver of the fire alarm system without impairing the functions of the maintenance telephone equipment, thereby reducing installation space, avoiding individual displays when a fire is called, and improving the operability of fire response and call connection. [Means for solving the problem]

[0010] (Receiver 1: Call connection with selected telephone handset) The present invention is a receiver that enables fire monitoring by connecting a specific terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to the telephone unit via a second telephone line drawn from the telephone unit; a call control unit that controls each of calls via the first telephone line and calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The call control unit is characterized by performing a predetermined call control by connecting the receiver to either the first or second telephone handset selected by a predetermined operation performed by a person on the receiver to select the telephone handset to be connected to for the call, and controlling the other telephone handset to which the call is not connected so as to output a hold tone.

[0011] (Receiver 2: Three-way call) The present invention is a receiver that enables fire monitoring by connecting a specific terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to the telephone unit via a second telephone line drawn from the telephone unit; a call control unit that controls each of calls via the first telephone line and calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The call control unit performs predetermined call control and connects both the first handset and the second handset to the receiver in response to a predetermined manual operation on the receiver to select the handset to be connected for a call.

[0012] (Receiver 3: Two-way call between telephone handsets) The present invention is a receiver that enables fire monitoring by connecting a specific terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to the telephone unit via a second telephone line drawn from the telephone unit; a call control unit that controls each of calls via the first telephone line and calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The call control unit performs predetermined call control by connecting the first handset and the second handset in response to a predetermined operation performed by a person on the receiver to select a handset to be connected for a call.

[0013] (Fire broadcast) When the second telephone circuit unit detects an incoming call from the second handset, the call control unit causes a predetermined fire broadcast to be made at a location corresponding to the second handset that detected the incoming call.

[0014] (Fire alarm system) The present invention relates to a fire alarm system, The receiver as described above; As a terminal device, at least a fire detector that detects a fire and is connected to a receiver; a maintenance handset as a first handset, which is connectable to a first telephone line drawn out from a first telephone circuit section of the receiver; a second telephone handset, an emergency telephone handset connected to a second telephone line drawn out from the second telephone circuit section of the receiver; The present invention is characterized by comprising: Effect of the Invention

[0015] (Basic effect) The present invention provides a receiver that enables fire monitoring by connecting a specific terminal device, the receiver includes a first telephone circuit section that detects an incoming call from a first handset connected to the receiver through a first telephone line drawn from the receiver, a second telephone circuit section that detects an incoming call from a second handset connected to the receiver through a second telephone line drawn from the receiver, and a call control section that controls the calls through the first telephone line and the second telephone line, and performs a specific call control when the first telephone circuit section detects an incoming call from the first handset and the second telephone circuit section detects an incoming call from the second handset. This makes it possible to reduce the burden on the operator by stopping the incoming call notification by voice from the other telephone that is not in use or by playing a hold tone to the handset. Furthermore, the same receiver can be used to commonly make calls with the first handset or the second handset, and call operations can be performed simply and easily without changing locations. In addition, even if the first handset and the second handset receive calls at the same time, the call connection can be performed without any problems.

[0016] (Effect of connecting to the selected telephone handset) In addition, the call control unit, as a specified call control, connects the receiver to either the first or second telephone handset selected by a specified operation performed by a person on the receiver to select the telephone handset to be connected for the call, and controls the other telephone handset to which the call is not connected so that it outputs a hold tone.As a result, even if there are overlapping incoming calls to the first and second telephone handsets, it is possible to select one of the callers as necessary and to have the unselected caller wait by listening to a hold tone.

[0017] (Effect of three-way calling) In addition, the call control unit has a predetermined call control function, and both the first and second telephone handsets are connected to the receiver by a predetermined operation performed by a person at the receiver to select the telephone handset to which the call will be connected.This allows the caller at the first telephone handset, the caller at the second telephone handset, and the fire prevention manager on the receiver side to carry out necessary communication among the three parties without being hindered by overlapping incoming calls, and to take necessary fire response measures quickly and appropriately.

[0018] (Effect of two-way calls between telephone handsets) The call control unit is configured to perform predetermined call control by connecting the first and second telephone handsets through a predetermined operation by a person on the receiver to select the telephone handset to which the call will be connected, thereby making it possible for necessary communication between the caller of the first telephone handset and the caller of the second telephone handset to be carried out between the two parties without a receiver on the receiver side, allowing necessary measures to be taken quickly and appropriately. [Brief description of the drawings]

[0019] [Figure 1] An explanatory diagram showing the outline of the R-type fire alarm system according to the present invention, in which the receiver is provided with emergency and maintenance telephone functions. [Diagram 2] An explanatory diagram showing the appearance of the receiver from the front [Diagram 3] An explanatory diagram showing the normal monitoring screen. [Figure 4] An explanatory diagram showing the normal monitoring screen when a maintenance call is received. [Diagram 5] FIG. 13 is an explanatory diagram showing an emergency call incoming screen when an emergency call is received. [Figure 6] Fig. 5 shows the fire alarm screen when an emergency call is received. [Figure 7] An explanatory diagram showing the emergency call incoming screen when an emergency call and a maintenance call are received at the same time. [Figure 8] FIG. 8 is an explanatory diagram showing an emergency call incoming screen when the emergency call button is operated in FIG. 7. [Figure 9] FIG. 8 is an explanatory diagram showing an emergency call incoming screen when the maintenance call button is operated in FIG. 7. [Figure 10]An explanatory diagram showing an emergency call incoming screen with a three-way call button DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] [Fire alarm system] FIG. 1 is an explanatory diagram showing an outline of an R-type fire alarm system according to the present invention, in which a receiver is provided with the facility functions of a maintenance telephone and an emergency telephone.

[0021] (Basic Concept of the Embodiment) The fire alarm system according to this embodiment is a fire alarm system that monitors for fires using an analog fire detector 14 connected to a signal line 12-1 drawn from a receiver 10, and includes a touch panel display 52, a reception control unit 70 that performs a predetermined fire alarm process when a fire occurs and receives a fire alarm signal from the analog fire detector 14, a maintenance telephone circuit unit 62 that detects an incoming call made by a maintenance telephone handset 28 connected to a maintenance connection terminal 26 of a maintenance telephone line 24 drawn from the receiver 10 and establishes a call connection with the telephone base unit using a base unit speaker 66 and a base unit microphone 68, an emergency telephone circuit unit 64 that detects an incoming emergency call made by a hook-on of an emergency telephone handset 34 connected to an emergency telephone line 32 drawn from the receiver 10 and establishes a call connection with the telephone base unit on the receiver 10 side and notifies the reception control unit 70 of the incoming emergency call to be notified, and a maintenance telephone circuit unit 62 and an emergency telephone circuit unit 62 and an emergency telephone circuit unit 62 are connected to the maintenance telephone circuit unit 62 and the emergency telephone circuit unit 62. and a call control unit 72 which controls calls made by each of the telephone handsets 28 and 64, and which controls calls when calls from both the maintenance telephone handset 28 and the emergency telephone handset 34 overlap. Since there is no need to install a separate emergency telephone base unit as in the past, the installation space for the fire alarm equipment and the emergency telephone equipment is reduced. By utilizing the display 52 provided in the receiver 10, the display of the fire call and the source of the fire, etc., which are necessary for operating the emergency telephone equipment, can be displayed in the same way as when a fire occurs in the fire alarm equipment. Therefore, disaster prevention personnel, etc. can quickly and appropriately handle and operate the fire call made by the emergency telephone handset 34 or the transmitter on the receiver 10. Furthermore, calls with the emergency telephone handset 34 or the maintenance telephone handset 28 can be made in common using a hands-free telephone base unit using the same base unit speaker 66 and base unit microphone 68, and call operation can be made simply and easily without changing locations.

[0022] Furthermore, when the maintenance handset 28 and the emergency handset 34 receive calls at the same time, the call control unit 72 enables a three-way call between either one of them and the base station, or between both of them, and even if calls from multiple handsets overlap, it enables a call with a freely selected caller as necessary. This will be described in detail below.

[0023] (Fire alarm system overview) As shown in Fig. 1, for example, an R-type receiver 10 is installed in a manager's room on the first floor of a building where a fire alarm system is installed, and signal lines 12-1 to 12-n are drawn from the receiver 10 to the security area, for example, for each floor. In the following description, when it is not necessary to distinguish between the signal lines 12-1 to 12-n, they may be referred to as signal line 12.

[0024] A plurality of analog fire detectors 14 having a transmission function and a unique address are connected to the signal line 12-1, and an on-off fire detector 18 and a transmitter 20 are connected to a detector line 17 drawn from a repeater 16 having a transmission function and a unique address, and further an addressable transmitter 15 having a transmission function and a unique address is connected. Furthermore, a smoke control device 22 is connected to the signal line 12-n via a repeater 16 having a transmission function and a unique address.

[0025] Here, the maximum number of addresses that can be set for terminal devices such as analog fire detectors 14 and repeaters 16 connected to signal lines 12-1 to 12-n is, for example, 255, and terminal devices including a maximum of 255 analog fire detectors 14 can be connected to signal line 12.

[0026] In addition, a maintenance telephone line 24 is extended from the receiver 10 to the security zone, and a maintenance telephone terminal 26 using a telephone jack is connected to the maintenance telephone line 24. A maintenance telephone handset 28 carried by inspection personnel during regular inspections is connected to the maintenance telephone terminal 26 via a telephone plug 30, and conversations are made with the receiver 10.

[0027] Although not shown in the figure, the maintenance telephone terminal 26 is actually built into the addressable transmitter 15 and transmitter 20 provided on the signal line 12-1 side, and can be connected by opening the maintenance doors 15a, 20a of the addressable transmitter 15 and transmitter 20 and inserting the telephone plug 30 of the maintenance telephone handset 28 into the telephone jack inside.

[0028] In addition, an emergency telephone line 32 is drawn from the receiver 10 to the security area, and an emergency telephone handset 34 is connected to the emergency telephone line 32. When the handset of the emergency telephone handset 34 is picked up, the hook switch is turned on, which causes the emergency telephone handset 34 to transmit an emergency telephone call signal including a unique caller address to the receiver 10, causing the receiver 10 to display an emergency telephone call indicating the caller. It is also possible to make a call to the receiver 10 by picking up the emergency telephone handset 34. The emergency telephone handset 34 may be configured separately as an emergency telephone handset device having a calling function, and a repeater having a function of communicating with the receiver, such as transmitting a signal including a unique caller address to the receiver 10.

[0029] In addition to the fire alarm system, this embodiment is also provided with emergency broadcasting equipment, and broadcasting lines 38 are drawn from an emergency broadcasting panel 36 installed in the same manager's room as the receiver 10, for example, to the security zone, with separate systems for each floor, and a broadcasting speaker 40 is connected to the broadcasting line 38.

[0030] (Receiver functional configuration) Receiver 10 is provided with a main CPU 42 and a plurality of sub-CPU boards 44-1 to 44-n, and sub-CPU boards 44-1 to 44-n are provided with sub-CPUs 46-1 to 46-n and transmission units 48-1 to 48-n.

[0031] The main CPU 42 and the sub CPUs 46-1 to 46-n are connected by a serial transfer bus 50, and transmit and receive data between them. In the following description, the sub CPUs 46-1 to 46-n and the transmission units 48-1 to 48-n may be referred to as the sub CPUs 46 and the transmission unit 48 when there is no need to distinguish between them.

[0032] A display 52 with a touch panel using a liquid crystal display panel or the like is connected to the main CPU 42, and information necessary for fire monitoring by the receiver 10 is displayed on the display 52 according to the status of the receiver 10 at that time. Information necessary for fire monitoring by the display 52 includes all information such as events that occur during normal monitoring and in the event of a fire, information necessary for operation management, information necessary for response operations, and also information necessary for operation management and operation of the receiver. In addition, the display 52 displays maintenance calls and outgoing maintenance call information and operation information.

[0033] In addition to the display 52 that functions as a display means for the main CPU 42, a display unit 54 using indicator lights such as LEDs is provided. The display unit 54 is provided with a fire indicator light, a gas leak indicator light, and the like.

[0034] An operation unit 56 is connected to the main CPU 42, and is provided with various switches required for fire monitoring, such as a fire decision switch, a main sound stop switch, and a district sound pause switch. A notification unit 60 is also connected to the main CPU 42, and when an emergency call is received by picking up the emergency telephone handset 34, the notification unit 60 outputs an emergency call notification signal including the caller's source to the emergency broadcast panel 36, and selects the floor on which the fire has occurred and the floor immediately above as the broadcast area to make an emergency broadcast.

[0035] The main CPU 42 also includes a reception control unit 70 and a call control unit 72 which function by executing a program.

[0036] Furthermore, in order to realize the functions of emergency telephone equipment and maintenance telephone equipment, the receiver 10 is provided with: A maintenance telephone circuit section 62, an emergency telephone circuit section 64, a base unit speaker 66, and a base unit microphone 68 are provided, the details of which will be explained later. Here, the base unit speaker 66 also functions as an acoustic alarm section that outputs an acoustic fire alarm in the event of a fire.

[0037] (Receiver appearance) 2 is an explanatory diagram showing the appearance of the receiver from the front. A display 52 with a touch panel using a liquid crystal display panel or the like is arranged on the face of the receiver 10. The display 52 displays color images on its screen, and the touch panel arranged on the screen allows selection and input by touching the screen. Note that the display 52 can be an appropriate image display panel such as an EL panel other than a liquid crystal display panel.

[0038] A guide switch 74 is disposed below the display 52 in a position that is easily visible and easy for the user to operate, which is in the center of the left and right sides of the panel. The guide switch 74 uses an illuminated switch with an illumination function, and the illuminated switch has an indicator light such as an LED built in. When a fire event occurs and information that is the subject of guidance is displayed on the display 52, the illumination function of the guide switch 74 is activated and the switch flashes, prompting the user to operate the guide switch 74.

[0039] In addition, a fire decision switch 76, a main sound stop switch 78, and a district sound pause switch 80 are arranged on the lower panel of the display 52, enabling fire response operations in the event of a fire event. A small door 90 is provided on the lower panel of the guide switch 74 so as to be able to open freely forward with its lower side as an axis, and various operation switches including a recovery switch are provided on the inside of the small door 90.

[0040] In addition, a base unit microphone 68 is disposed to the left of the fire determination switch 76, and in combination with the base unit speaker 66 shown in Fig. 1 provided inside an acoustic hole 88 provided next to the display 52, a hands-free telephone base unit is formed. That is, the base unit speaker 66 provided in the receiver 10 functions as the handset of the telephone base unit, and the base unit microphone 68 functions as the transmitter of the telephone base unit, making it possible to make a hands-free call with the maintenance telephone handset 28 or emergency telephone handset 34.

[0041] In addition, a fire indicator light 84 and a gas leak indicator light 86 are provided on the upper panel of the display 52. ​​Furthermore, a printer 82 is provided below the panel of the receiver 10, so that events that occur on the receiver 10 are printed out.

[0042] In this embodiment, the base unit speaker 66 and the base unit microphone 68 constitute a telephone base unit for hands-free use, but a handset 92 may be provided on the face of the receiver 10, as shown by imaginary lines in FIG.

[0043] (Receiver fire monitoring control) As shown in Fig. 1, taking the sub-CPU 46-1 of the sub-CPU board 44-1 as an example, it performs fire monitoring control by instructing the transmission unit 48-1 to transmit and receive signals to and from the analog fire detector 14 according to a predetermined communication protocol. Downstream signals from the transmission unit 48-1 to the analog fire detector 14 are transmitted in voltage mode. This voltage mode signal is transmitted as a voltage pulse that changes the line voltage of the signal line 12-1 between, for example, 18 volts and 30 volts.

[0044] On the other hand, the upstream signal from the analog fire detector 14 to the transmitter 48-1 is transmitted in a current mode. In this current mode, a signal current is passed through the signal line 12-1 at the timing of bit 1 of the transmission data, and the upstream signal is transmitted to the receiver 10 as a so-called current pulse train.

[0045] During normal monitoring, the fire monitoring control by the sub-CPU 46-1 periodically instructs the transmission unit 48-1 to transmit a broadcast batch AD conversion signal including a batch AD conversion command, and the analog fire detector 14 that receives this batch AD conversion signal detects and stores the smoke density or temperature as sensor data. Next, the sub-CPU 46-1 transmits a call signal including a polling command that sequentially specifies the terminal addresses.

[0046] When the analog fire detector 14 receives a call signal having an address that matches its own address, it transmits a response signal including the sensor data it is holding at that time to the transmission unit 48-1. Also, when the smoke concentration or temperature exceeds a predetermined fire caution level, the analog fire detector 14 transmits a fire interrupt signal to the transmission unit 48-1 of the receiver 10.

[0047] When the sub-CPU 46-1 receives a fire interrupt signal via the transmission unit 48-1, it transmits a group search command signal to identify the group including the analog fire detector 14 that has detected the fire, and then transmits an intra-group search command signal to identify the address of the analog fire detector 14 that has detected the fire, centrally collects analog data from the sensor, and transmits it to the main CPU 42 via the serial transfer bus 50.

[0048] The main CPU 42 compares the analog data received from the sub-CPU 46-1 with a predetermined fire judgment level, and when the analog data reaches the fire judgment level, it judges it to be a fire, turns on the fire representative light 84 on the display unit 54, outputs a predetermined main sound alarm indicating a fire from the parent unit speaker 66, displays fire alarm information including the location of the fire on the display 52 based on the sensor address where the fire was detected, and further outputs a fire report signal including the location of the fire to the emergency broadcast panel 36 via the report transfer unit 60, causing a predetermined emergency broadcast to be made.

[0049] In addition, the sub-CPU 46-n and the transmission unit 48-n provided on the sub-CPU board 44-n perform interlocking control of the smoke control device 22 based on interlocking information stored in advance when a fire is detected by the main CPU 42.

[0050] [Telephone equipment] (Telephone circuit section of receiver) 1, the receiver 10 is provided with a maintenance telephone circuit section 62, an emergency telephone circuit section 64, a base unit speaker 66, and a base unit microphone 68. The telephone base unit provided in the receiver 10 is composed of the base unit speaker 66 which serves as a handset, and the base unit microphone 68 which serves as a transmitter. In the following explanation, the term "telephone base unit" refers to the base unit speaker 66 and the base unit microphone 68, and may also refer to a telephone base unit composed of the base unit speaker 66 and the base unit microphone 68.

[0051] The maintenance telephone circuit section 62 applies a predetermined DC voltage to the maintenance telephone line 24, and when the telephone plug 30 of the portable maintenance telephone handset 28 is inserted and connected to any of the maintenance telephone terminals (telephone jacks) 26, it detects the line current that flows at this time, detects an outgoing call, and outputs a maintenance telephone outgoing signal to the call control section 72 of the receiver 10. Upon receiving the maintenance telephone outgoing signal, the call control section 72 displays a maintenance telephone outgoing screen on the display 52, outputs a maintenance telephone ring tone, and connects the maintenance telephone handset 28 and the telephone base unit for a call by operating the screen of the maintenance telephone call button.

[0052] The emergency telephone circuit section 64 applies a predetermined DC voltage to the emergency telephone line 32, and when any of the emergency telephone handsets 34 is picked up, the hook switch is turned on and an emergency telephone call signal including a preset caller address is transmitted, and when this emergency telephone call signal is received, it outputs the emergency telephone call signal including the caller address to the call control section 72 of the receiver 10. The call control section 72, which has received the emergency telephone call signal, instructs the reception control section 70 to display an emergency telephone incoming call screen indicating the emergency telephone call and the caller on the display 52, output an emergency telephone ring tone, and connect the emergency telephone handset 34 to the telephone base unit by operating the emergency telephone call button on the screen.

[0053] In addition, the call control unit 72 instructs the notification unit 60 within a specified time after receiving the emergency telephone signal to output an emergency telephone notification signal indicating the source of the call to the emergency broadcast panel 36, and causes a specified fire broadcast to be made to the fire floor from which the call was made and the floor immediately above it.

[0054] [Call Controls] The call control unit 72 displays the operations required for call control with the telephone base unit on the display 52 based on the outgoing signals from the maintenance telephone circuit unit 62 and the emergency telephone circuit 64, and performs control based on screen operations. This will be described in detail below.

[0055] (Normal monitoring screen) Fig. 3 is an explanatory diagram showing a normal monitoring screen displayed on the display of the receiver. As shown in Fig. 3, when the receiver 10 is in a normal monitoring state, a normal monitoring screen 94 is displayed on the display 52. ​​On the normal monitoring screen 94, following a normal operation display 96, menu buttons 98, 100, and 102 are arranged, and menus "Learn procedures," "Operate," and "View information" are displayed, and when any of the menu buttons 98, 100, and 102 is touched, information or operation scenes corresponding to each menu are displayed.

[0056] (Maintenance call incoming screen) Fig. 4 is an explanatory diagram showing a normal monitoring screen when a maintenance call is received. When the telephone plug 30 of the maintenance telephone handset 28 carried by an inspection personnel during regular inspection or the like is inserted into any of the maintenance telephone terminals 26 shown in Fig. 1 and connected to the maintenance telephone line 24, the maintenance telephone circuit section 62 of the receiver 10 detects the line current flowing through the maintenance telephone line 24 due to the connection of the maintenance telephone handset 28, and outputs a maintenance call signal to the call control section 72 provided in the main CPU 42.

[0057] The call control unit 72, which has received the maintenance call signal from the maintenance phone circuit unit 62, displays an incoming maintenance call display 104, a call button 106, and a hold button 108 in the empty space below the normal monitoring screen 94 displayed on the display 52, as shown in Fig. 4. The incoming maintenance call display 104 displays a guidance such as "A maintenance call has been received. Press the call button to talk to the caller." In addition, the call control unit 72, which has received the maintenance call signal from the maintenance phone circuit unit 62, outputs a predetermined maintenance call incoming tone (maintenance call ring tone) from the parent unit speaker 66 shown in Fig. 1.

[0058] A disaster prevention manager or the like on the receiver 10 side who becomes aware of an incoming maintenance call will touch the call button 106 displayed on the screen, and the call control unit 72 will detect the operation of the call button 106 and make a call connection that connects the calling maintenance telephone handset 28 and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit on the receiver 10 side so that a call can be made.

[0059] Specifically, the voice signal transmitted from the maintenance telephone handset 28 is received by the maintenance telephone circuit section 62, A / D converted by the main CPU 42, and read into the call control section 72 as a digital voice signal. After undergoing voice processing such as noise suppression, the signal is converted to D / A and audio amplified, and then output from the base unit speaker 66.

[0060] In addition, the voice signal transmitted from the parent unit microphone 68 is AD converted by the main CPU 42 and read into the call control unit 72 as a digital voice signal, and after predetermined voice processing such as high-frequency emphasis is performed, it is output to the maintenance telephone circuit unit 62 as an analog voice signal by DA conversion, and the voice is amplified and transmitted to the maintenance telephone line 24, causing the voice to be output from the handset of the maintenance telephone handset 28.

[0061] Furthermore, when the call control unit 72 detects a touch operation of the hold button 108 displayed on the screen during a call connection for a maintenance call, it disconnects the call between the maintenance handset 28 and the base unit speaker 66 and base unit microphone 68 constituting the base unit, sends a predetermined hold tone signal to the maintenance handset 28 to output a hold tone, and at the same time, causes the display of the hold button 108 to blink or flash to indicate that the call is on hold. Note that the hold tone may be output from the base unit speaker 66 as necessary.

[0062] If the hold button 108 is touched again while the call is on hold, the call control unit 72 detects this, releases the hold, and resumes the call connection between the maintenance telephone handset 28 and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit.

[0063] To end the maintenance call, for example, when the call button 106 is touched again, the call control unit 72 detects this and disconnects and releases the call connection between the maintenance telephone handset 28 and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit. Also, when the maintenance telephone circuit unit 62 detects the interruption of the line current caused by removing the maintenance telephone handset 28 from the maintenance telephone terminal 26 and outputs this to the call control unit 72, the call connection is disconnected and released.

[0064] In addition, a call end button may be provided on the outgoing call screen of the maintenance telephone so that the call connection can be disconnected and released by touching it, or a call button may be provided on the maintenance telephone handset 28 so that calls can be started and ended by turning the button on and off.

[0065] (Screen when a fire breaks out) Fig. 5 is an explanatory diagram showing an emergency call incoming screen when an emergency call is received. In the fire alarm system of Fig. 1, when a watchman or the like discovers a fire during patrol, he picks up the emergency telephone handset 34 installed nearby, which turns on the hook switch and transmits an emergency call outgoing signal including the caller's address to the receiver 10 via the emergency telephone line 32. When the emergency telephone circuit section 64 of the receiver 10 receives the emergency call outgoing signal from the emergency telephone handset 34, it outputs the signal to the call control section 72 provided in the main CPU 42.

[0066] The call control unit 72, which has received an emergency call signal from the emergency telephone handset 34, displays an emergency call incoming screen 110 shown in Fig. 4 on the display 52. ​​The emergency call incoming screen 110 displays, for example, "An emergency call has been received. Check the situation at the bottom of the screen and take action" as an emergency call incoming display 112, and an emergency call incoming display 116 below the menu buttons 98, 100, and 102 displays, for example, guidance such as "An emergency call has been received. Press the call button to talk to the caller," and also displays "1st floor, South 4th district, 12:07:25," which indicates the calling area and time. A disaster prevention manager on the receiver 10 side who has learned of such an emergency call will touch the call button 118 displayed on the screen to check the situation, and the call control unit 72 detects the operation of the call button 118 and makes a call connection to connect the emergency telephone handset 34 of the caller to the base unit speaker 66 and base unit microphone 68 constituting the telephone base unit on the receiver 10 side so that they can make a call.

[0067] Specifically, the voice signal transmitted from the emergency telephone handset 34 is received by the emergency telephone circuit section 64, A / D converted by the main CPU 42, and read into the call control section 72 as a digital voice signal. After undergoing voice processing such as noise suppression, the signal is converted to D / A and audio amplified before being output from the base unit speaker 66.

[0068] In addition, the voice signal transmitted from the parent unit microphone 68 is AD converted by the main CPU 42 and read into the call control unit 72 as a digital voice signal, and after predetermined voice processing such as high-frequency emphasis is performed, it is output to the emergency telephone circuit unit 64 as an analog voice signal by DA conversion, and the voice is amplified and transmitted to the emergency telephone line 32, causing the voice to be output from the handset of the emergency telephone handset 34.

[0069] If a fire is confirmed through a call with the caller using such an emergency phone, the disaster prevention manager or the like will operate the fire determination switch 76 shown in Figure 2 provided on the receiver 10, and the receiving control unit 70 will detect the fire determination and perform the prescribed fire determination processing, such as sounding the entire area and controlling links.

[0070] Furthermore, when the call control unit 72 detects a touch operation on the hold button 120 displayed on the screen during an emergency call connection, it disconnects the call between the emergency handset 34 and the base unit speaker 66 and base unit microphone 68 constituting the telephone base unit, sends a predetermined hold tone signal to the emergency handset 34 to output a hold tone, and at the same time, causes the display of the hold button 120 to blink or flash to indicate that the call is on hold. The hold tone may be output from the base unit speaker 66 as necessary.

[0071] If the hold button 120 is touched again while the call is on hold, the call control unit 72 detects this, releases the hold, and resumes the call connection between the emergency telephone handset 34 and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit.

[0072] To end the emergency call, for example, when the call button 118 is touched again, the call control unit 72 detects this and disconnects and releases the call connection between the emergency handset 34 and the base unit speaker 66 and base unit microphone 68 that constitute the base unit. Also, when the emergency handset 34 is returned to the hook, the hook switch is turned off, and the emergency phone circuit unit 64 detects the interruption of the line current and outputs it to the call control unit 72, thereby disconnecting and releasing the call connection.

[0073] (Interlocking of emergency call reception and emergency broadcast) When the call control unit 72 provided in the receiver 10 in FIG. 1 receives an emergency call signal by picking up the emergency telephone handset 34, it instructs the notification unit 60 to output an emergency call notification signal including the calling area to the emergency broadcast panel 36 within a predetermined time, for example within 10 seconds.

[0074] The emergency broadcast panel 36, which receives the emergency call transmission signal from the receiver 10, designates the floor where the fire occurred and the floor immediately above it as the broadcasting area, and broadcasts a fire. For example, this fire broadcast may say, "There's a fire. There's a fire in the south area on the first floor. Please remain calm and evacuate." In addition, when a predetermined time has passed since the start of the emergency broadcast, the emergency broadcast panel 36 broadcasts the emergency broadcast to all broadcasting areas simultaneously throughout the entire building.

[0075] (Emergency call screen with multiple incoming calls) Fig. 6 is an explanatory diagram showing an emergency call incoming screen when an emergency call is made following Fig. 5. In the fire alarm system of Fig. 1, when an emergency call is made by picking up the emergency handset 34 and then another emergency call is made by picking up another emergency handset 34, a new emergency call outgoing display 116-2 is displayed under the emergency call incoming display 116, for example, a guidance saying "An emergency call has been received. Press the talk button to talk to the caller" together with the calling area "1st floor, South 3rd district, 12:10:13", and a talk button 118-2 and a hold button 120-2 are also displayed.

[0076] A disaster prevention manager or the like on the receiver 10 side who becomes aware of such a new emergency call can touch the call button 118-2 displayed on the screen to establish a call connection between another emergency telephone handset 34 and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit on the receiver 10 side, and make the necessary call communication.

[0077] [Duplicate emergency and maintenance calls] Figure 7 is an explanatory diagram showing the emergency call incoming screen when an emergency call and a maintenance call overlap, Figure 8 is an explanatory diagram showing the emergency call incoming screen when the emergency call button is operated in Figure 7, and Figure 9 is an explanatory diagram showing the emergency call incoming screen when the maintenance call button is operated in Figure 7.

[0078] (Screen display of duplicate calls) In the fire alarm system of FIG. 1, if a fire occurs during regular maintenance inspection, it is expected that both maintenance calls and emergency calls will be received.

[0079] In this case, if a patrolling monitor discovers a fire and picks up the emergency telephone handset 34, an emergency call signal will be sent to the receiver 10, and if the inspector who discovered the fire inserts the telephone plug 30 of the maintenance telephone handset 28 he is carrying into the telephone jack of the nearby maintenance telephone terminal 26, a maintenance call signal will be sent to the receiver 10, and the call control unit 72 of the receiver 10 will display the emergency call incoming screen 110 shown in Figure 7 on the display 52.

[0080] The emergency call incoming screen 110 in FIG. 7 is the emergency call incoming screen 110 shown in FIG. 5 with the addition of the maintenance call incoming display 104, talk button 106, and hold button 108 that are the same as the display shown in FIG. 4, and the disaster prevention manager or the like on the receiver 10 side can select either an emergency call or a maintenance call to make a call as necessary.

[0081] For example, if a disaster prevention manager or the like touches the emergency phone talk button 118, the call control unit 72 switches to an emergency call incoming screen 110 shown in Fig. 8, connects the call originating emergency phone handset 34 to the base unit speaker 66 and base unit microphone 68 constituting the base unit to enable a call by the emergency phone, and at the same time transmits a hold tone signal to the maintenance phone handset 28 to output a hold tone. Also, the call control unit 72 displays the non-selected maintenance call incoming display 104, talk button 106, and hold button 108 dimmed on the screen, as shown by dotted lines, until the emergency phone call connection is released.

[0082] Also, when a disaster prevention manager or the like touches the maintenance phone talk button 106, the call control unit 72 switches to an emergency call incoming screen 110 shown in Fig. 9, connects the calling maintenance phone handset 28 and the base unit speaker 66 and base unit microphone 68 constituting the base unit to enable a call by the maintenance phone, and at the same time transmits a hold tone signal to the emergency phone handset 34 to output a hold tone. Also, the call control unit 72 displays the non-selected emergency call incoming display 116, talk button 118, and hold button 120 dimmed on the screen, as shown by dotted lines, until the call connection for the maintenance phone is released.

[0083] (Selection of duplicate calls by priority) In addition, when there are overlapping incoming calls to the maintenance telephone handset 28 and the emergency telephone handset 34, the call control unit 72 may perform control to connect a call between either the maintenance telephone handset 28 or the emergency telephone handset 34 and the telephone base unit in accordance with a preset priority, and to send a hold tone to the other.

[0084] For this reason, a high priority is set in the call control unit 72, for example, to the call from the emergency handset 34, by a predetermined setting operation. In this case, when an emergency call and a maintenance call are made at the same time, as shown in an emergency call incoming screen 110 in Fig. 8, the call control unit 72 displays the emergency call incoming display 116, the call button 118, and the hold button 120, which are set to a high priority, on the screen, and at the same time, displays the maintenance call incoming display 104, the call button 106, and the hold button 108, which are set to a low priority, in a dim light on the screen, as shown by the dotted lines, until the call connection of the emergency call is released. At the same time, the call control unit 72 automatically connects the emergency handset 34, which is the call origin, to the base unit speaker 66 and the base unit microphone 68, which constitute the base unit, for the emergency call with a high priority, and performs control to enable a call with the call origin.

[0085] Of course, if necessary, a high priority may be set for maintenance calls and a low priority for emergency calls.

[0086] The advantages of giving priority to emergency calls are as follows: An emergency call has the same meaning as a fire call, and an emergency call is broadcast from the emergency broadcast panel 36. Therefore, by giving priority to an emergency call, it becomes possible to give priority to a fire call from an emergency call.

[0087] The benefits of giving priority to maintenance calls are as follows: When a detector goes off, a monitor heads to the site and uses a maintenance phone to report the situation to the receiver. Therefore, by giving priority to maintenance calls, it is possible to give priority to calls from on-site monitors.

[0088] As described above, there is an advantage to giving priority to maintenance calls when a detector alarm is activated, so the monitor or the receiver may be configured to give priority to maintenance calls when a detector alarm or pre-alarm is output, and to give priority to emergency calls under normal circumstances.

[0089] (Three-way call) 10 is an explanatory diagram showing an emergency call incoming screen with a three-way call button. When an emergency call and a maintenance call are made at the same time, the call control unit 72 of the receiver 10 displays an emergency call incoming screen 110 with a three-way call button 130 shown in FIG. 10 on the display 52.

[0090] This emergency call incoming screen 110 has a new three-way call button 130 arranged in place of the hold buttons 108 and 120 of the emergency call incoming screen 110 shown in FIG.

[0091] When a disaster prevention monitor or the like on the receiver 10 side receives an overlapping emergency call and maintenance call and the emergency call incoming screen 110 of Figure 10 is displayed, by touching the three-way call button 130, this is detected by the call control unit 72, and control is performed to mutually connect the emergency telephone handset 34, which is the source of the call, the maintenance telephone handset 28, and the base unit speaker 66 and base unit microphone 68 that constitute the telephone base unit, thereby enabling a three-way call.

[0092] This three-way call connection is as follows, assuming that the voice signal from the base unit microphone 68 is the base unit voice signal, the voice signal from the emergency telephone handset 34 is the emergency telephone voice signal, and the voice signal from the maintenance telephone handset 28 is the maintenance telephone voice signal.

[0093] The base unit voice signal from the base unit microphone 68 is read into the main CPU 42 by AD conversion, then DA conversion and separated into the maintenance telephone circuit section 62 and the emergency telephone circuit section 64, and transmitted to the maintenance telephone line 24 and the emergency telephone line 32.

[0094] In addition, the emergency telephone voice signal from the emergency telephone handset 34 is AD converted and read into the main CPU 42, then DA converted and output to the parent speaker 66, and is also combined with the AD converted parent unit voice signal from the parent unit microphone 68, output to the maintenance telephone circuit section 62 via DA conversion, and transmitted to the maintenance telephone line 24.

[0095] In addition, the maintenance telephone voice signal from the maintenance telephone handset 34 is AD converted and read into the main CPU 42, then DA converted and output to the parent speaker 66, and is also combined with the AD converted parent voice signal from the parent microphone 68, output to the emergency telephone circuit section 64 via DA conversion, and transmitted to the emergency telephone line 32.

[0096] With this type of three-way call connection, the telephone base unit of the receiver 10 can hear the voices of the callers on the emergency telephone handset 34 and the maintenance telephone handset 28, the emergency telephone handset 34 can hear the voices of the callers on the telephone base unit and the maintenance telephone handset 28, and further, the maintenance telephone handset 28 can hear the voices of the callers on the telephone base unit and the emergency telephone handset 34, making it possible to make calls in the same way as if all three parties were together.

[0097] The three-way call connection of the emergency call and the maintenance call may be achieved not by the main CPU 42 separating and combining the voice signals, but by hardware such as a switch.

[0098] [Modifications of the present invention] (Select between emergency and maintenance calls) In the above embodiment, when a maintenance telephone handset and an emergency telephone handset receive calls at the same time, the target for call connection is set by operating the display, but the present invention is not limited to this.

[0099] The voice input section on the parent unit may be provided separately for a maintenance telephone and an emergency telephone, and the target for call connection may be selected by operating either one. The maintenance telephone recognizes the operation by inserting the maintenance telephone transmitter into the jack, and the emergency telephone recognizes the operation by hooking up the emergency telephone transmitter.

[0100] In addition, a physical switch for selecting whether the maintenance telephone handset or the emergency telephone handset is to be the priority call target may be disposed within the receiver panel.

[0101] Also, the maintenance telephone handset and the emergency telephone handset may receive calls simultaneously, and only the transmission from the receiver may be switched.

[0102] (Incoming emergency and maintenance call display) In the above embodiment, the incoming calls to the maintenance telephone handset and the emergency telephone handset are displayed on the display, but the present invention is not limited to this.

[0103] For example, an emergency call from an emergency handset may be indicated on a display, and an incoming maintenance call may be indicated by a maintenance call light located in the panel. Since an emergency handset transmits an emergency call signal including a unique caller address and can identify the installation location, it is preferable to indicate the caller on a display.

[0104] (Maintenance and emergency calls) Instead of a three-way call including the receiver, a two-way call may be possible using only the maintenance telephone and the emergency telephone.

[0105] (Temporary suspension of emergency broadcasts) When an emergency call is received, the receiver outputs an emergency call transfer signal including the call origin to the emergency broadcast panel 36, and selects the floor where the fire occurred and the floor immediately above as the broadcast area to make an emergency broadcast. However, it is also possible to enable an interlocking stop operation that does not output this transfer. The interlocking stop operation for all emergency call incoming calls may be performed with a single operation, or the interlocking stop operation may be performed for each emergency call received. It is also possible to enable both.

[0106] (Emergency broadcast from the receiver) A line for transmitting audio signals may be connected between the receiver and the emergency broadcast panel, and an emergency broadcast may be made by transmitting an audio signal from the receiver to the emergency broadcast panel. This makes it possible to make emergency broadcasts from the emergency telephone handset or the maintenance telephone handset.

[0107] (Telephone base unit) As shown by phantom lines in FIG. 2, when a handset 92 is provided on the receiver 10, the screen display is the same as when the telephone base unit is configured with a base unit speaker 66 and a base microphone 68 for hands-free operation, and when an outgoing call is made, the handset 92 is picked up and the call button displayed on the screen is touched to enable communication with the caller.

[0108] (P-type receiver) The above embodiment takes as an example a fire alarm system in which an R-type fire detector is connected via a signal line from an R-type receiver, but similarly, for a fire alarm system in which an addressable fire detector equipped with a transmission function and an address can be set on the detector line drawn from a P-type receiver, by providing the equipment functions of a maintenance telephone and an emergency telephone, there is no need to install a conventional emergency telephone base unit separately, thereby reducing the installation space for the fire alarm system and the emergency telephone system, and by utilizing the display provided on the receiver, it is possible to display the fire call and the fire origin, etc., necessary for operating the emergency telephone system, in the same way as the fire call and the origin by the transmitter of the fire alarm system, and disaster prevention personnel, etc. can quickly and appropriately handle and operate the fire call by the emergency telephone handset or the transmitter on the receiver, and further, calls with the emergency telephone handset or the maintenance telephone handset can be made using the same telephone base unit in common, and call operations can be made simply and easily without changing locations.

[0109] (Automatic broadcast function) In addition, in the above embodiment, an emergency broadcast by emergency broadcast equipment is linked to a fire report from an emergency telephone, but the functions of the emergency telephone equipment and maintenance telephone equipment according to the above embodiment may be provided for fire alarm equipment at fire-prevention objects where emergency broadcast equipment is not installed.

[0110] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values ​​shown in the above embodiment. [Explanation of symbols]

[0111] 10: Receiver 12-1~12-n: Signal lines 14: Analog fire detector 15: Addressable transmitter 16: Repeater 17: Sensor line 18: On-off fire detector 20: Transmitter 22: Smoke prevention equipment 24: Maintenance telephone line 26: Maintenance telephone terminal 28: Maintenance phone handset 30: Telephone plug 32: Emergency telephone line 34:Emergency phone handset 36: Emergency broadcast board 38: Broadcasting line 40: Speaker 42: Main CPU 44-1 to 44-n: Sub-CPU board 46-1 to 46-n: Sub-CPU 48-1 to 48-n: Transmission section 52: Display 54: Display section 56:Operation section 60: Transfer Department 62:Maintenance telephone circuit section 64:Emergency telephone circuit section 66: Parent unit speaker 68: Parent unit microphone 70: Reception control unit 72: Call control unit 74: Guide switch 76: Fire-determining switch 78: Main sound stop switch 80: Area sound pause switch 82: Printer 84: Fire representative light 86: Gas leak indicator light 88: Acoustic hole 92: Handset 94: Normal monitoring screen 96: Normal operation display 98, 100, 102: Menu buttons 104:Incoming maintenance call display 106, 118, 118-2: Call button 108, 120, 120-2: Reserve button 110: Emergency call screen 112: Incoming emergency call display 116,116-2: Emergency call incoming display 130: Three-way call button

Claims

1. A receiver that enables fire monitoring by connecting a specified terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to said second telephone circuit section via a second telephone line drawn from said second telephone circuit section; a call control unit that controls each of the calls via the first telephone line and the calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The call control unit of this receiver is characterized in that, as the specified call control, it connects the receiver to one of the first and second telephone handsets selected by a specified operation by a person at the receiver to select the telephone handset to be connected for a call, and controls the other telephone handset to which the call is not connected so as to output a hold tone.

2. A receiver that enables fire monitoring by connecting a specified terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to said second telephone circuit section via a second telephone line drawn from said second telephone circuit section; a call control unit that controls each of the calls via the first telephone line and the calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The call control unit performs the specified call control, and connects both the first telephone handset and the second telephone handset to the receiver by a specified operation performed by a person at the receiver to select the telephone handset to which the call should be connected.

3. A receiver that enables fire monitoring by connecting a specified terminal device, a first telephone circuit section for detecting an incoming call from a first telephone handset connected to said first telephone circuit section via a first telephone line drawn from said first telephone circuit section; a second telephone circuit section for detecting an incoming call from a second telephone handset connected to said second telephone circuit section via a second telephone line drawn from said second telephone circuit section; a call control unit that controls each of the calls via the first telephone line and the calls via the second telephone line, and performs predetermined call control when the first telephone circuit unit detects an incoming call from the first handset and the second telephone circuit unit detects an incoming call from the second handset; was established, The receiver is characterized in that the call control unit, as the specified call control, connects the first telephone handset and the second telephone handset for a call by a specified operation by a person at the receiver to select the telephone handset to which the call should be connected.

4. 4. A receiver according to claim 1, further comprising: The receiver is characterized in that, when the call control unit detects an incoming call from the second telephone handset by the second telephone circuit unit, a predetermined fire broadcast is made at a location corresponding to the second telephone handset that detected the incoming call.

5. A receiver according to any one of claims 1 to 4; As a terminal device, at least a fire detector that detects a fire and is connected to the receiver; a maintenance handset as a first handset, the maintenance handset being connectable to the first telephone line drawn out from the first telephone circuit section of the receiver; As a second telephone handset, an emergency telephone handset is connected to the second telephone line drawn out from the second telephone circuit unit of the receiver; A fire alarm system comprising:

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