JP7192379B2 - emergency call system - Google Patents

Description

The present invention relates to an emergency call system for making an emergency call to an emergency call receiving agency such as a police station, a fire station, or the Japan Coast Guard.

In an emergency call system that makes an emergency call to a special number (110, 119, 118), which is the telephone number of the emergency call reception system (hereinafter referred to as the command desk) of the emergency call reception organization such as the police station, fire station, and Japan Coast Guard, To make an emergency call by seizing a telephone line when an emergency call factor such as a traffic accident or fire occurs.

For example, in the case of a fire reporting system, when a fire reporting factor occurs, the fire reporting device calls 119, which is the telephone number of the fire control center, and after the fire control center responds, the built-in voice message is sent. Then disconnect the phone line. After that, it waits for a certain period of time to receive a call back from the fire control center, and when it receives a call back, it responds using the dedicated fire reporting telephone connected to the fire reporting device and calls. disconnect.

As such a fire reporting system, as shown in FIG. 102-n (where n is an integer of 3 or more) branch-connected (Non-Patent Document 1). In this fire reporting system, each of the telephones 102-1 to 102-n dedicated to fire reporting can respond to messages from the fire command center and make a call.

However, in the fire reporting system shown in FIG. 3, when a plurality of dedicated fire reporting telephones are off-hooked in response to a reverse message, the voltage between L1 and L2 of the analog telephone line 103 drops, causing an electrical failure. It may become unstable and you may not be able to make calls.

On the other hand, in such a system in which a plurality of telephones are connected to one analog telephone line, as a telephone system that solves the problem caused by the off-hooking of a plurality of telephones, when a certain telephone is detected to be off-hook, There is a telephone system in which the switch between the telephone and the analog telephone line is closed and the switch between the other telephone and the analog telephone line is opened to limit the number of telephones that can be used for communication to only one telephone (Patent Document 1). ).

JP-A-59-215160

"Fire alarm device SD-205F, system configuration" (http://www.saxa.co.jp/product/report/sd205f/system.html, retrieved on September 26, 2018)

By applying the technical idea described in Patent Document 1 to the fire notification system described in Non-Patent Document 1, a problem caused by off-hooking of multiple dedicated fire notification telephones in response to the reverse message. A fire notification system is conceivable to solve this problem.

However, in this fire reporting system, only one dedicated telephone for fire reporting is in communication with the telephone line. Since a third party other than the whistleblower cannot know the contents of the call, there are the following problems.

In other words, in an emergency such as a fire, it is desirable to quickly obtain information such as the content of the call between the fire department and the first reporter, the situation at the scene of the fire, safe evacuation routes, etc. Nevertheless, there is a problem that such information cannot be obtained until confirmation is made from the first caller after the end of the call.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and its object is to provide an emergency call device accommodating an analog telephone line and a plurality of branch-connected analog telephone lines accommodated in the emergency call device. To avoid a call-disabled state caused by an electrically unstable state of an analog telephone line even when a plurality of emergency call-only telephones are off-hooked in an emergency call system having two emergency call-only telephones. To enable a third party other than the first caller to quickly know the contents of the call.

The present invention provides an emergency call system having an emergency call device accommodating an analog telephone line, and a plurality of dedicated emergency call telephones branch-connected to the analog telephone line accommodated in the emergency call device, wherein off-hook detection means for detecting off-hook of the telephone dedicated to reporting; line voltage detection means for detecting voltage of the analog telephone line; a disconnecting means for disconnecting the emergency telephone, which is detected to be off-hooked, from the analog telephone line when the voltage detected by the off-hook detecting means and below a predetermined threshold is detected by the line voltage detecting means; and monitoring means for supplying a voice signal of the voice during the call to a dedicated emergency call telephone disconnected from the analog telephone line.

According to the present invention, in an emergency call system having an emergency call device accommodating an analog telephone line and a plurality of dedicated emergency call telephones branch-connected to the analog telephone line accommodated in the emergency call device, Even if the telephone dedicated to emergency calls is off-hooked, it is possible to avoid the state of being unable to make a call due to the electrical instability of the analog telephone line, and a third party other than the first caller can make the call. You can know the contents quickly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the fire reporting system which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the operation|movement of the reverse message standby after the fire report of the fire reporting system which concerns on the 1st Embodiment of this invention. It is a figure which shows schematic structure of the conventional fire notification system.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
<Configuration of fire notification system>
FIG. 1 is a diagram showing the configuration of a fire notification system according to a first embodiment of the present invention.

This fire reporting system consists of a fire reporting device 1 accommodating one analog telephone line 3, and n units branch-connected to the analog telephone line 3 accommodated in the fire reporting device 1 (where n is an integer of 2 or more). , and telephones 2-1 to 2-n dedicated to fire notification. Here, the fire reporting device 1, the dedicated fire reporting phones 2-1 to 2-n, and the fire reporting system having them respectively correspond to the emergency reporting device, the dedicated emergency reporting phone, and the emergency reporting system according to the present invention. Although not shown, the fire reporting device 1 is normally connected to a general telephone that can be used while the fire reporting device 1 is on standby.

The telephones 2-1 to 2-n dedicated to fire reporting have the same configuration, and their constituent elements are handsets 21-1 to 21-n, transmission/reception conversion circuits 22-1 to 22-n, and switching circuits. 23-1 to 23-n, hook detection circuits 24-1 to 24-n, and speakers 25-1 to 25-n. Hereinafter, when the telephones 2-1 to 2-n dedicated to fire reporting are not distinguished, they will be referred to as telephones 2 dedicated to fire reporting, and the constituent elements thereof are a handset 21, a transmission/reception conversion circuit 22, a switching circuit 23, a hook detection circuit 24, and a It is called speaker 25 .

The handset 21 of the fire notification dedicated telephone 2 has a receiver for receiving calls and a microphone for sending calls. The transmission/reception conversion circuit 22 is means for converting 2-wire and 4-wire communication between the switching circuit 23 and the handset 21 . By opening and closing the switching circuit 23, the communication line between the analog telephone line 3 and the handset 21 is interrupted, and between the speaker 25 and the input line of the line monitor signal (details will be described later) from the fire alarm device 1. is a means of interrupting the The hook detection circuit 24 is means for detecting the hook state (off-hook/on-hook) of the handset. The speaker 25 is a means for converting the line monitor signal from the fire alarm device 1 into voice.

The fire notification device 1 includes a control section 11, a line voltage detection circuit 12, a monitor circuit 13, and an amplifier circuit . The control unit 11 has a CPU and a memory, and is control means for controlling the entire fire notification device 1 . This memory holds the threshold value (lower limit) of the line voltage (the voltage between L1 and L2) at which one dedicated fire reporting telephone set 2 operates normally. That is, since the line conditions of the analog telephone line 3 differ depending on the installation site of the fire reporting device 1, the electrical conditions (line voltage, etc.) of the dedicated fire reporting telephone 2 are measured for each installation site, and the The threshold value is obtained based on the measurement result and written in the memory.

The line voltage detection circuit 12 is means for detecting the line voltage of the analog telephone line 3 . The monitor circuit 13 supplies an audio signal (line monitor signal) of the voice of the call in response to the call from the fire command center (hereinafter referred to as the call to the caller) to the dedicated fire reporting telephone not used for the call to the caller. , and the amplifier circuit 14 is a circuit for amplifying the audio signal.

This figure shows a state in which the first caller is making a reverse call on the dedicated telephone for fire reporting 2-1, and a third party is monitoring the voice during the call on the dedicated telephone for fire reporting 2-n. ing.

<Operation of the fire reporting system while it is waiting for counterattacks>
FIG. 2 is a flow chart showing the operation of the fire reporting system according to the first embodiment of the present invention during standby for a reverse message after a fire report. This flow is executed by the control unit 11 in the fire reporting device 1 . In the explanation of this figure, the dedicated phone for fire reporting is simply referred to as a dedicated phone.

First, the control unit 11 determines whether or not the dedicated telephone 2 is off-hooked based on the hook signal input from the dedicated telephone 2 (step S1). If it is determined that the mobile phone is not off-hooked (step S1: No), the process moves to step S11 to perform processing for responding to absence (timeout processing), and terminate the flow shown in this figure.

If it is determined that the user has been off-hooked (step S1: Yes), the call state monitoring process is performed (step S2). That is, it continues to monitor the hook detection signal from the dedicated telephone set 2 from which the off-hook is detected.

Next, it is determined whether or not the call has ended (step S3). That is, it is determined whether or not the hook detection signal from the dedicated telephone set 2 for which off-hook was detected in step S2 has changed to on-hook. If it is determined that the call has ended (step S3: Yes), the process of ending the reverse call, for example, the process of switching the connection destination of the analog telephone line 3 from the dedicated telephone 2 to the general telephone (step S4), Then, this End the flow shown in the figure.

If it is determined that the call has not ended (step S3: No), it is determined whether or not the second and subsequent dedicated telephones 2 have been off-hooked (step S5). If it is determined that it is not off-hooked (step S5: No), the process proceeds to step S2, and processing of monitoring the call status of the dedicated telephone 2 during the reverse call is performed.

If it is determined that the off-hook has occurred (step S5: Yes), it is determined whether or not the line voltage has fallen below the threshold (step S6). That is, it is determined whether or not the output value of the line voltage detection circuit 12 has fallen below the threshold held in the memory within the control section 11 .

If it is determined that the line voltage is not below the threshold (step S6: No), the process proceeds to step S2. In this case, the dedicated telephone 2 determined to be off-hooked in step S5 is in a state of communication with the fire command center, and a three-way call can be made between the dedicated telephone 2 determined to be off-hooked in step S1 and the fire command center. become.

If it is determined that the line voltage has fallen below the threshold (step S6: Yes), the dedicated telephone set 2 that is not in the call state is controlled to disconnect from the line (L1-L2) (step S7). That is, the control unit 11 sends an off-hook stop signal to the switching circuit 23 of the dedicated telephone 2 that is not in the talking state to open the switch. At this time, only the dedicated telephone set 2 detected to be off-hook in step S5 may be disconnected from the line (L1-L2).

Next, the monitor circuit 13 is activated, and an audio signal of the voice during the call with the fire control center is sent to the speaker 25 of the dedicated telephone 2 that is not in the call state (step S8). As a result, the voice during the call with the fire control center is output from the speaker 25 of all the dedicated telephones 2 other than the call state. This step S8 may be executed simultaneously with step S7.

Next, it is determined whether or not the call has ended (step S9), and if it is determined that the call has not ended (step S9: No), this step is repeated. On the other hand, if it is determined that the call has ended (step S9: Yes), processing for ending the monitoring operation is performed (step S10). That is, the operation of the monitor circuit 13 is stopped. After the end of the monitoring operation, the end of the reverse message call processing (step S4) described above is executed, and then the flow shown in this figure is ended.

As described in detail above, according to the fire notification system according to the first embodiment of the present invention, the following effects (1) to (4) are obtained.
(1) Even if a plurality of dedicated fire reporting telephones 2 are off-hooked due to other fire reporting telephones 2 being off-hooked during a reverse call of one fire reporting telephone 2, an analog telephone can be used. It is possible to avoid a state in which communication is impossible due to the line 3 becoming electrically unstable.
(2) A third party other than the first whistleblower can quickly know the contents of the call between the first whistleblower and the fire control center. As a result, it is possible to rapidly transmit information such as the fire occurrence status, evacuation routes, dispatch status of firefighters, etc. to the required contacts, and it is expected that prompt evacuation will be possible.
(3) Since the line monitor signal is driven from the fire reporting device 1, there is no need to mount a power source on the dedicated fire reporting telephone 2 side.
(4) Based on the line voltage of the analog telephone line 3, in order to determine whether or not the telephone dedicated to fire reporting 2 can make a call, depending on the line environment, the fire control center, the first reporter, and a third party call becomes possible.

[Second embodiment]
The second embodiment is obtained by modifying the following (a) to (e) with respect to the first embodiment.
(a) Eliminate the transmission line of the hook detection signal from the dedicated fire notification telephone 2 to the fire notification device 1, and do not transmit the signal.
(b) The transmission line for the off-hook stop signal from the fire reporting device 1 to the dedicated fire reporting telephone 2 is eliminated, and the fire reporting device 1 does not generate or transmit that signal.
(c) A control unit and a line voltage detection circuit are provided in the telephone 2 dedicated to fire notification.
(d) The threshold value of the line voltage is held in the memory in the control section.
(e) The control unit in the telephone dedicated to fire notification 2 detects the line voltage of the analog telephone line 3 by means of the line voltage detection circuit when the hook detection circuit 24 detects the off-hook. When the line voltage falls below the threshold value held in the memory, the switching circuit 23 is controlled to disconnect the own apparatus from the analog telephone line 3, and the line monitor signal is taken in from the fire alarm device 1 and sent to the speaker 25. supply.

It should be noted that, in the present invention, the following modifications (i) to (iii) are possible with respect to the first embodiment and the second embodiment described above.
(i) An emergency call system that reports to the police command center (110) or an emergency call system that reports to the Japan Coast Guard command center (118).
(ii) An emergency call system having a function of selectively reporting to a plurality of command consoles by providing buttons corresponding to multiple command consoles on the emergency call device and pressing the button corresponding to the command console to be notified. do.
(iii) The fire reporting device 1 transmits a voice message, and before disconnecting the analog telephone line 3, it is configured to be in a communication state with the fire command center in response to pressing a predetermined button. Run the specified flow.

1 Fire reporting device 2-1 to 2-n Fire reporting dedicated telephone 3 Analog telephone line 12 Line voltage detection circuit 13 Monitor circuit 23-1 to 23-n Switching circuit 24- 1 to 24-n . . . Hook detection circuits.

Claims (4)

An emergency call system comprising an emergency call device accommodating an analog telephone line and a plurality of dedicated emergency call telephones branch-connected to the analog telephone line accommodated in the emergency call device,
off-hook detection means for detecting off-hook of the emergency call telephone;
line voltage detection means for detecting the voltage of the analog telephone line;
When the off-hook detecting means detects that another emergency call-only telephone is off-hooked during a call of a certain emergency call-only telephone, and the line voltage detecting means detects a voltage below a predetermined threshold, the off-hook. disconnecting means for disconnecting the emergency call dedicated telephone from the analog telephone line;
monitoring means for supplying an audio signal of the voice during the call to a dedicated emergency call telephone disconnected from the analog telephone line;
emergency call system. In the emergency call system according to claim 1,
The disconnecting means disconnects all emergency call-only phones other than the emergency call-only phone during the call from the analog telephone line, and the monitoring means disconnects all the emergency call-only phones other than the emergency call-only phone during the call. an emergency call system that provides an audio signal of said voice during the call to In the emergency call system according to claim 1 or 2,
An emergency call system, wherein the line voltage detection means and the monitor means are provided in the emergency call device, and the off-hook detection means and the disconnection means are provided in the emergency call telephone. In the emergency call system according to claim 1 or 2,
The emergency call system, wherein the monitor means is provided in the emergency call device, and the line voltage detection means, the off-hook detection means, and the disconnection means are provided in the emergency call telephone.

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