JPS63134480A - Emergency talking device for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an emergency call device for an elevator that allows a car to communicate with a central monitoring device when an abnormal situation occurs in the elevator.

<Prior Art> Elevator cars are equipped with emergency call devices so that passengers trapped in the car due to power outage accidents can communicate with outsiders.

FIG. 2 shows the configuration of a conventional elevator emergency call device, in which a first emergency call device consisting of an emergency push button 1a, a transmitter 1b, and a receiver IC is provided in a car 1. . On the other hand, the central monitoring device 2 is provided with a transmitter 7, and a transmitter amplifier 8 is connected to the output terminal of the transmitter 7.
The input terminal of the transmitting amplifier 8 is about to be connected to the communication device 4. Furthermore, the input terminal of a receiver amplifier 5 is connected to the telephone device 4, and the output terminal of the receiver amplifier 5 is connected to the input terminal of a receiver 6. These transmitter 7, transmitting amplifier 8, telephone device 4, receiving amplifier 5, and telephone receiver 6 constitute a second emergency telephone device provided within the central monitoring device 2.

A terminal device 3 is provided which is connected to the car 1 and is connected to the central monitoring device 2 via a telephone line 13. This terminal device 3 is provided with a control device 9, to which an input terminal of a transmitting amplifier 10 and an output terminal of a receiving amplifier 12 are respectively connected. The input terminals are connected to the communication device 11, respectively.

These control device 9, transmitting amplifier 10, receiving amplifier 12
and the telephone device 11 constitute a connection control circuit within the terminal device 3. The output terminal of the emergency push button 1a of the car 1 is connected to the control device 9, and the output terminal of the telephone receiver 1c is connected to the control device 9.
It is connected to the connection point of the control device 9 and the receiving amplifier 12. Further, an input terminal of the transmitter 1b of the car 1 is connected to a connection point between the control device 9 and the transmitter amplifier 10.

In the conventional elevator emergency call device having such a configuration, when an emergency situation such as a power outage accident occurs, when a passenger presses the emergency push button 1a, an emergency signal is input to the control device 9. When the control device 9 receives the emergency signal, the first emergency call device of the car 1 and the second emergency call device of the central monitoring device 2 are connected to each other by the connection control circuit of the terminal device 3.

Therefore, passengers in the car 1 can make calls to the handset 6 of the central monitoring device 2 through the handset 1b, and can also receive instructions from the lifeguard from the handset 7 of the central monitoring device 2 through the handset IC. It becomes possible to receive calls.

<Problems to be Solved by the Invention> During an emergency call using the above-mentioned elevator emergency call device, the voice of the passenger in the car 1 is transmitted through the transmitter 1b,
The voice is received through the transmitting amplifier 10, the telephone device 11, the telephone line 13, the telephone device 4, the receiving amplifier 5, and the telephone receiver 6.

In addition, the voice of the supervisor of the central monitoring device 2 is transmitted through the transmitter 7.
, the transmitting amplifier 8, the telephone device 4, the telephone line 13, the telephone device 11, the receiving amplifier 12, and the receiver IC.

In this case, in the elevator emergency call device mentioned above,
Howling may occur in a loop circuit composed of the transmitter 1b, the transmitter amplifier 10, the communication device 11, the receiver amplifier 12, and the receiver IC.

Particularly when there are few passengers in the car, the echoes of the voice inside the car are large, and in addition to the voice of the passenger directly speaking, the echoed voice inside the car is input to the transmitter 1b, and the voice echoes inside the car are input simultaneously. During a call, the echo of the voice from the receiver IC inside the car is superimposed on this, so howling occurs in the loop circuit, making the voice from the receiver 6 of the central monitoring device 2 unclear and difficult to hear.

In the conventional emergency call device described above, since the amplification degrees of the transmitting amplifier 10 and the receiving amplifier 12 that constitute the connection control circuit are constant, howling cannot be suppressed by adjusting the amplification degrees of these amplifiers. . Although emergency call equipment is equipped with an automatic gain control device, the excessive input characteristics of high frequency components are not flat, so even if automatic gain control is performed, it is hardly effective in suppressing howling. do not have.

This is because when an abnormal situation occurs, passengers who are trapped in a car are in an abnormal psychological state, so their voices become high-pitched, and their voices contain many high-frequency components. This is because it is not possible to suppress howling even if the audio having a large number of high frequency components is controlled by an automatic gain control device in which the excessive input characteristics of the high frequency components are not flat.

Although it is possible to use an automatic gain control device with flat excessive input characteristics of high-frequency components, this is not desirable because it increases manufacturing costs.

The present invention has been made in view of the current state of emergency call devices for elevators as described above, and its purpose is to suppress howling in calls when an abnormal situation occurs, and to provide an emergency call system for elevators that can be obtained without increasing manufacturing costs. The purpose of the present invention is to provide a communication device.

Means for Solving the Problems> In order to achieve the above object, in the present invention, a first emergency call device is provided in the elevator car, and a second emergency call device is provided in the central monitoring device. provided, the first emergency call device is connected to a terminal device, the terminal device and the central monitoring device are connected by a telephone line, and the first and second emergency call devices are provided in the terminal device. In an elevator emergency call device, the first emergency call device, the connection control circuit, and the second emergency call device are connected to each other by a connection control circuit to perform a call between the car and the central monitoring device. a howling detection circuit that detects howling occurring in a loop circuit configured by the device;
The terminal device includes an amplification degree adjustment circuit that adjusts the amplification degree of the loop circuit based on the detection output of the howling detection circuit.

Effect> In the present invention, when howling occurs in the loop circuit formed by the first emergency call device of the car and the connection control circuit of the terminal device during an emergency call, the howling detection circuit detects this. Since the amplification degree of the loop circuit is adjusted based on the detection output of the howling detection circuit, howling occurring in the loop circuit is suppressed, and clear communication can always be made during an emergency call.

<Example> Hereinafter, an example of the present invention will be described in detail using FIG.

FIG. 1 is a block diagram showing the configuration of the main parts of an embodiment of the present invention. The configuration is exactly the same as in Figure 2.

The terminal device 14 is provided with a control device 9 , an input terminal of a transmitting amplifier 18 is connected to the control device 9 , and an output terminal of the transmitting amplifier 18 is connected to the communication device 11 . An input terminal of a howling detection circuit 15 is connected to this communication device 11, an output terminal of the howling detection circuit 15 is connected to an input terminal of a receiver amplifier 17, and an output terminal of the receiver amplifier 17° is connected to a control device 9. There is. Further, a detection signal terminal of the howling detection circuit 15 is connected to the control device 9.

Furthermore, the input terminal of an amplification degree adjustment circuit 16 that sets the amplification degree according to a command from the control device 9 is connected to the control device 9, and the output terminal of the amplification degree adjustment circuit 16 is connected to a transmitting amplifier 18 and a receiving amplifier 17, respectively. Connected to the control terminal.

The output terminal of the emergency push button 1a of the first emergency communication device of the car 1 is connected to the control device 9, the output terminal of the receiver IC is connected to the output terminal of the receiver amplifier 17, and the output terminal of the receiver IC is connected to the output terminal of the receiver amplifier 17.
The input terminal of b is connected to the input terminal of the transmitter amplifier 18.

The rest of the configuration is the same as the conventional elevator emergency call device described with reference to FIG.

The operation of the embodiment of the present invention having such a configuration will be described below.

An emergency situation occurs in the elevator, and a passenger presses emergency push button 1a.
When is pressed, an emergency signal is input to the control device 9. As a result, the first emergency call device of the car 1 and the second emergency call device of the central monitoring device 2 are connected to each other by the connection control circuit of the terminal device 14, and the transmitter 1b and the transmitter amplifier 18
, a telephone device 11, a telephone line 13, and a second telephone line (not shown).
The telephone receiver of the emergency telephone device is connected to enable communication. At the same time, a transmitter of a second emergency communication device (not shown), a telephone line 13, a communication device 11, a howling detection circuit 15,
The receiver amplifier 17 and the receiver 1c are connected to enable communication. Transmitter 1b, transmitter amplifier 18, and communication device 11 of car 1
, when howling occurs in the loop circuit composed of the howling detection circuit 15, receiver amplifier 17, and receiver 1c, a detection signal is sent from the howling detection circuit 15 to the control device 9.
given to.

When the detection signal is input, the control device 9 inputs a command signal to the amplification degree adjustment circuit 16, and the amplification degree adjustment circuit 16 in accordance with this command signal controls the transmission amplifier 18 in the embodiment.
A control signal is input to the receiver amplifier 17. This control signal causes the transmitting amplifier 18 and the receiving amplifier 17 to linearly decrease their amplification degrees. While the howling detection circuit is occurring in the loop circuit described above, the howling detection circuit 15 is emitting a detection signal, and while this detection signal is present, the amplification level setting circuit 16 is outputting a control signal. .

In this way, when howling occurs in the loop circuit, the amplification degree of the loop circuit is automatically reduced until the howling disappears.

On the other hand, in order to prevent the amplification degree of the passenger's voice signal in the car 1 from decreasing too much due to a decrease in the amplification degree of the loop circuit, the control device 9 automatically controls the voice signal of the passenger when the voice signal of the passenger falls below a predetermined value. It is desirable to have a configuration in which the amplification factor of the loop circuit is monitored and stopped from further decreasing the amplification factor of the loop circuit, or the amplification factor of the loop circuit is increased.

Therefore, according to the present invention, when an emergency occurs, the first
When howling occurs during an emergency call made through the emergency call device, the connection control circuit, and the second emergency call device, the amplification degree of the loop circuit constituted by the first emergency call device and the connection control circuit is adjusted to eliminate howling. It becomes possible to always communicate clearly between the passenger car 1 and the central monitoring device 2 by suppressing communication.

In the embodiment, a case has been described in which the amplification degrees of the transmitting amplifier 18 and the receiving amplifier 17 are decreased linearly by the control signal from the amplification degree adjustment circuit 16, but the amplification degrees may be reduced stepwise or exponentially. It is also possible to reduce the amount of energy.

Furthermore, in the embodiment, a case has been described in which the amplification degrees of both the transmitting amplifier 18 and the receiving amplifier 17 are decreased by the control signal from the amplification degree setting circuit 16. It is also possible to reduce the degree of amplification on one side.

<Effects of the Invention> As explained in detail above, according to the present invention, it is possible to automatically suppress the occurrence of howling during emergency calls, maintain an appropriate audio level, and always make calls with clear audio signals. This makes it possible to provide an elevator emergency call device that does not require complicated amplification settings during installation and does not significantly increase manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional elevator emergency call device, and FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. 1...Car, 1a...Emergency push button,
1b...Telephone, IC...Telephone receiver, 2
... Central monitoring device, 3 ... Terminal device,
4.9.11・・・Telephone device, 5.12.17・
...Receiving amplifier, 8.10.18... Transmitting amplifier, 6... Receiver, 7... Transmitter, 15... Howling detection circuit, 16...
...Amplification degree setting circuit. Figure 1

Claims (1)

[Claims] A first emergency call device is provided in the elevator car, a second emergency call device is provided in the central monitoring device, and the first emergency call device is connected to a terminal device, and the terminal device and the central monitoring device are connected to each other. The monitoring devices are connected by a telephone line, and the first
and a second emergency call device is connected to each other by a connection control circuit provided in the terminal device to perform a call between the car and the central monitoring device, wherein the first emergency call device a howling detection circuit that detects howling occurring in a loop circuit constituted by the communication device, the connection control circuit, and the second emergency communication device; and adjusting the amplification degree of the loop circuit based on the detection output of the howling detection circuit. An emergency call device for an elevator, characterized in that an amplification adjustment circuit is provided in the terminal device.