JPS61169066A - Emergency alarm device - Google Patents

Abstract

PURPOSE:To eliminate failure the service operator at the service station to hear the alarming sound of the disconnection of a call by providing a sound reducing mean which lowers, by a prescribed quantity, the sound level of the sound from a cage to a service center when an emergency alarm is transmitted. CONSTITUTION:When a passenger confined in the cage of the elevator depresses a call button of an interphone 1, the direct call between the passenger and the service operator is made possible. When about 2 minutes past after the said state the alarming sound is transmitted and the CPU23 outputs a control signal to the switching circuit 26 only for 10 seconds and opens a terminal. By this, an attenuator 25 is inserted into the transmission circuit of the interphone 1, and attenuates the sound level by a prescribed quantity. At this point of time, an alarming sound informing the disconnection of the call is transmitted from a controll-signal transmission-reception part 22 to the service station side through a transformer 21. Because the alarm signal became more audioble due to the lowered level of the sound of call, the operator hardly fail to note that the disconnection time is aproaching.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a communication device that, when a person is trapped in an elevator car, connects a communication device installed in the elevator car and a communication device installed in a service center (hereinafter referred to as This relates to an emergency notification device that allows direct communication between the two parties using a telephone line tV (called an intercom).

[Conventional technology]

FIG. 2 is a block diagram showing this type of telephone call system, in which an intercom (
1) is an emergency notification device! (2), and this emergency call device #(2) is connected to telephone port 1 (4) which connects to the telephone office (8), while another telephone line (4) which connects to the telephone office (8) A receiver (5) of a service center that manages elevators and the like is connected to the receiver, and this receiver (5) is equipped with an intercom (6) for telephone calls by center staff.

Here, when a power outage occurs while an elevator car (not shown) is traveling between floors, and passengers are stuck, the operation signal of the call button of the intercom (1) or the signal of the elevator operation panel (not shown), etc. When a call is made, the emergency call device (2) responds and closes the telephone line to the service center, allowing passengers in the car and center staff to use intercoms (1) and (6), respectively. K so that you can talk directly. In this case, in order to limit the call time, a warning sound indicating that "the call will be terminated soon" is generated every fixed period of time, for example, every two minutes. If the center staff member hears this alarm and determines that it is necessary to continue the call, a call extension signal is sent. When the emergency notification device (2) receives this call extension signal, it remains in a state where it can make a call. Then, if the center staff outputs a call-end signal when they wish to end the call, the emergency call device automatically disconnects (releases) the telephone line.

Note that if the center staff does not send a call extension signal, the telephone line will be disconnected a certain amount of time after the alarm is sounded.

[Problem that the invention seeks to solve]

Conventional emergency call devices such as those mentioned above use an intercom (
1) Since the sound sent through the center and the alarm sound are at approximately the same level, there is a problem in that center staff often miss the alarm sound when they are engrossed in conversation.

The present invention was made to solve this problem, and an object of the present invention is to provide an emergency notification device that can reliably prevent a situation in which a center staff member fails to hear an alarm sound informing that a call has been terminated.

[Means for solving problems]

The emergency notification device according to the present invention is provided with a sound reduction means for reducing the sound level transmitted from the car to the service center by a predetermined amount when an alarm sound is issued.

[Effect]

In this invention, by lowering the level of the sound transmitted from the car to the service center in response to the alarm sound, the ability of the center staff to hear the alarm sound is enhanced.

〔Example〕

FIG. 1 is a circuit diagram partially showing the configuration of an embodiment of the present invention as a block diagram, and the same reference numerals as in FIG. 2 indicate the same or corresponding parts, respectively.
The intercom (1) is equipped with a receiver (b), a transmitter (depressor), a call button (not shown), etc., and an emergency call device (2).
) is a transformer @11 that transmits and receives audio signals and superimposes alarm sounds, etc., and a computer that generates various control signals by receiving signals from the transformer (21) transmitting/receiving section and signals from a call button (not shown). Central processing unit Q! 8) and
The network control unit, which closes and opens the telephone line with the service center according to instructions from the central processing unit (to), and the transmitter (attenuation 6-proof installed in the voice transmission circuit of La), The attenuator (4) is provided with a switch circuit that short-circuits the input and output terminals of the attenuator (4) with a contact, and opens the contact for a certain period of time when the central processing unit (4) generates an alarm sound.

In the emergency notification system configured as described above, when a passenger who is trapped in the car of the elevator due to a power outage or the like presses a call button (not shown) on the intercom (1),
The central processing unit @) gives a control signal to the network control unit 4. At this time, the network control unit generates a signal similar to a dial impulse, and when the service center responds to the call, direct communication between the passenger in the car and the center staff becomes possible.

Next, when approximately 2 minutes have elapsed from this state and an alarm sound is to be emitted, the central processing unit @8) gives a control signal to the switch circuit (26) for approximately 10 seconds, including the time it takes to emit the alarm sound. to open the contact. As a result, the attenuator is inserted into the transmission circuit of the intercom (1), and the voice level is attenuated by a predetermined amount.

Furthermore, at this point, an alarm sound indicating that the call has been terminated is sent from the control signal transmitting/receiving section to the service center via the transformer (21).

In addition, this alarm sound is 941 olz) and 1209
(nz), for example, α1 (see
) and (L 1 (see) pause) are used.

In this way, the alarm will be heard relatively louder at the service center due to the lowered conversation level, and the user will not miss the fact that the time to terminate the call is approaching.

Generally, when an elevator becomes stuck,
It is expected that various interrupting sounds will be heard from the transmitter (top) of the intercom (1), and in such cases, lowering the audio level is extremely effective in making the alarm sound audible.

In the above embodiment, an attenuator is inserted in the audio signal circuit to lower the audio level, but the same result can be obtained by lowering the gain of an amplifier provided in the middle instead.

Further, in the above embodiment, the alarm level is relatively raised by lowering the audio level, but in special cases, the audio level may be left as is and the alarm level may be significantly increased.

〔Effect of the invention〕

As explained above, this invention reduces the audio level of a communication device installed in an elevator car by a predetermined amount, thereby reliably preventing a situation in which a center staff member fails to hear an alarm informing that a call has been terminated. I can do it.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram partially showing the configuration of an embodiment of the present invention in blocks, and FIG. 2 is an explanatory diagram of a general communication system using an emergency notification device. (')t(6)...Telephone device (2)...Emergency call device (
8)...Telephone office (4) Telephone telephone line (2)...
Handset (1j@...Transmitter (21)...Transformer...Control signal transmitting/receiving section 123)...Central processing section -Φ・Network control section (25)...Attenuator (2
61.-Switch circuit Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A first communication device provided in the elevator car and a second communication device provided in the service center are connected to each other using a telephone line, and after a predetermined time, In an emergency call device that transmits an alarm sound and opens a telephone line when a call extension signal requesting extension of the call is not transmitted from the second communication device, during the transmission of the alarm sound, the first communication device An emergency call device characterized by comprising a voice reduction means for reducing the voice level transmitted to the second communication device by a predetermined amount. (2) The sound reduction means includes an attenuator inserted into the audio signal transmission circuit of the first communication device, and a switch that constantly shorts the input and output terminals of this attenuator and opens it when an alarm sound is being emitted. An emergency notification device according to claim 1, characterized in that: