JPH0498964A - Line fault detector for automatic notice system - Google Patents

Abstract

PURPOSE:To detect a line fault in real time by discriminating it as a line fault when any of a call tone of an exchange station is not detected during talking and calling by an automatic notice device and raising an alarm. CONSTITUTION:When a telephone set is in use, a photocoupler 24 provided to a telephone line 12 is always lighted to detect it that a busy/call signal detection circuit 30 is in operation. When the result of discrimination in the busy state is not obtained and a call signal comes from a destination, the photocoupler 24 provided to the telephone line 12 is blinked and the control circuit 32 discriminates the presence of the call signal. If no call signal is obtained, relays B, C are used to disconnect the telephone set 14 and when a primary winding of a transformer circuit 28 is connected to the telephone line 12 simultaneously, it reaches the same state as off-hook of the telephone set 14 and since a dial tone of 400Hz is received from an exchange station, the dial tone is detected by a dial tone detection circuit 42 and when the dial tone is obtained normally, the telephone line 12 is discriminated as normal to terminate a series of line monitor processing.

Description

[Detailed description of the invention] [Industrial application field]

The present invention automatically transmits abnormality information to a pre-specified reporting destination such as a central monitoring center or a person's home through a telephone line in the event of an abnormality such as a fire, the activation of a security sensor such as a gas detector, or the operation of an emergency push button. The present invention relates to a line abnormality detection device for an automatic reporting system that provides automatic reporting.

[Conventional technology]

Conventionally, as a line abnormality detection device for automatic reporting systems,
An automatic notification device installed at the monitoring location periodically sends notifications to the central monitoring center or to the homes of the parties specified as notification destinations. However, if regular reports cannot be received, it is determined that there is a line abnormality.

[Problem to be solved by the invention]

However, with the line abnormality detection device of such conventional automatic reporting systems, even if a line abnormality occurs, the line abnormality is only discovered when the regular report time arrives and the center cannot receive the regular report. , there was a problem in that it took too much time to detect line abnormalities. There was also the problem of high operational costs, as call charges were incurred each time regular reports were made to monitor line abnormalities. The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a line abnormality detection device for an automatic reporting system that can quickly detect line abnormalities and reduce operating costs by eliminating the need for actual calls. With the goal.

[Means to solve the problem]

In order to achieve this object, the line abnormality detection device for the automatic notification system of the present invention is configured as follows. First, in the event of an abnormality such as when a connected security sensor such as a fire or gas detector is activated or an emergency push button is operated, the present invention sends a report to a pre-designated destination such as a central monitoring center or a person's home through a telephone line. Targeting automatic reporting systems that automatically report abnormal information. As a line abnormality detection device for such an automatic reporting system, the present invention includes: a telephone-in-use detection unit that detects that a telephone line is in use; a ringing signal detection unit that detects a ringing signal of the telephone line; A dial tone detector that captures the telephone line when the telephone is in use or when a ringing signal cannot be detected, and detects a dial tone sent from the exchange; activating the telephone-in-use detection unit, the ringing signal detection unit, and the dial tone detection unit each time,
The present invention is characterized in that it includes a control section that determines that there is a line abnormality and issues an alarm when no detection signal is detected from any of the detection circuits.

[Effect]

In the line abnormality detection device of the automatic notification system of the present invention having such a configuration, when the automatic notification device side is talking,
By determining that there is a line abnormality and issuing an alarm during a call, and even when no tone (400Hz) from the exchange is detected, line abnormalities can be monitored in almost real time, and the actual call to the center etc. can be monitored. Since no contact is required, there are no call charges.

【Example】

FIG. 1 is an embodiment configuration diagram showing an embodiment of an automatic notification device used in the automatic notification system of the present invention. In FIG. 1, 10 is an automatic notification device installed in a facility or residence to be monitored, and automatic notification device 1
0 is connected to a telephone line 12 for communication with the outside world, and is also connected to an ordinary telephone 14. Furthermore, for the automatic notification device 10, a gas detector 16 and a fire detector 1 are installed.
8 is connected. Further, the receiver 20 is configured to receive a notification signal from a pendant sensor 22 (a wireless transmitter with an operation button for emergency notification). The pendant sensor 22 is hung around the neck of a person with limited mobility, such as a bedridden person, and can transmit an emergency report signal to the receiver 20 by operating a switch when an abnormality occurs. Next, the configuration of the automatic notification device 10 will be explained. First, the telephone line 12 is drawn into the automatic notification device 10, and a light emitting diode of a photocoupler 24 is inserted and connected to one side of the telephone line 12, and the photocoupler is connected in the opposite direction to the photocoupler 24. 26 light emitting diodes are connected in parallel. Further, the telephone line 12 drawn into the automatic notification device 10 is connected to the relay contact b1. b2 to the telephone 14, and relay contacts b1. b2 switching allows the telephone 14 to be connected to or disconnected from the telephone line 12. Furthermore, relay contacts cl and c2 are inserted and connected to the telephone line 12 led into the automatic notification device 10, and the relay contact C1
, C2 connects the primary winding of the transformer circuit 28 to the switching contact, and the relay contact cl in the line disconnected state shown in the figure
, by switching c2 in conjunction with the opposite side, the telephone line 12
The primary winding of the transformer circuit 28 is inserted into the telephone line 12.
Communication signals can be transmitted and received between the terminal and the terminal via a transformer circuit 28. Furthermore, a relay contact a is connected between the telephone lines 12 drawn into the automatic notification device 10 for generating a dial pulse when the relay A is activated. The outputs of the phototransistors of the photocouplers 24 and 26 provided on the telephone line 12 are in use/calling signal detection circuit 3
It is input to 0. Photocoupler 24.26 and in use/
The calling signal detection circuit 30 also functions as a polarity reversal detection circuit for the telephone line 12. Therefore, when the handset of the telephone 14 is off-hook, the photodiode of the photocoupler 26 lights up due to the direct current flowing through the telephone line 12, and when the other party goes off-hook by sending a dial pulse, the polarity is reversed, and the photocoupler 24's photodiode is turned on. It will now switch to photodiode light emission. Therefore, the busy/ringing signal detection circuit 30 is connected to the photocoupler 24 or 2.
If a certain light reception signal is obtained from 6, it can be detected that the telephone line 12 is in use. On the other hand, when calling the telephone 14 through the telephone line 12, the telephone 14
A 16 Hz/75 V ringing signal for ringing the bell is obtained, and this ringing signal causes the photocoupler 2 to ring.
4 or 26 photodiodes start blinking. Therefore, the busy/ringing signal detection circuit 30 can detect a ringing signal on the telephone line 12 when a blinking light reception signal is obtained from the photocoupler 24 or 26. A detection signal from the busy/calling signal detection circuit 30 is given to a control circuit 32 using a CPU. For the control circuit 32, an input circuit 25, a display circuit 34,
An operating circuit 36 equipped with an emergency push button, etc., a setting numeric keypad switch 38 for setting a destination telephone number, etc., a memory circuit 40, relays A, B, and C, and a dial tone detection circuit 42 are connected. The output of the secondary winding of the transformer circuit 28 is input to the dial tone detection circuit 42, so that the dial tone of 400 Hz transmitted from the exchange of the telephone line 12 can be detected. The operation of the beep detection circuit 42 is controlled by the control circuit 32 and relay B is activated.
, C to disconnect the telephone 14 from the telephone line 12 by switching relay contacts bl and b2, and relay contacts cl,
The transformer circuit 28 is connected to the telephone line 12 by switching c2. The detection of the dial tone by the dial tone detection circuit 42 is performed when neither the busy detection signal nor the ringing signal detection signal is obtained from the busy/ringing signal detection circuit 30 in the line abnormality detection process of the control circuit 32. Becomes exposed. Further, a dialer circuit 44 is provided for the control circuit 32, so that a dial pulse can be sent to the telephone line 12 by opening and closing a relay contact a by a relay A. Further, the dialer circuit 44 is configured to be able to send a multi-frequency signal to the telephone line 12 via a PB double signal audio amplifier 46, a transformer circuit 28, and relay contacts C1 and C2. Further, the control circuit 32 is provided with a voice synthesis circuit 48 for reporting a predetermined voice message to the center side by automatic dialing in the event of an abnormality such as a fire or gas leak. The voice synthesis circuit 48 receives a command from the control circuit 32, reads out a predetermined voice message stored in the memory circuit 50, and converts it into an analog voice signal.
A voice message signal can be sent to the telephone line 12 via a bandpass filter 52, an audio amplifier 46, a transformer circuit 28, and relay contacts cl and c2. Furthermore, a speaker 56 is provided in the automatic notification device 10, and when a line abnormality of the telephone line 12 is detected by the line monitoring process by the control circuit 32, the voice synthesis circuit 48
An audible alarm signal obtained in response to an instruction to output an alarm is given to a speaker 56 by an amplifier 54, and an audible alarm indicating a line abnormality is issued. The control circuit 32 stores a control program for abnormality occurrence processing shown in the operational flowchart of FIG. 2 and a control program for line monitoring processing shown in the operational flowchart of FIG. 3. First, abnormality occurrence processing will be explained with reference to the operational flow diagram of FIG. For example, if a fire detection signal is given to the control circuit 32 from the fire detector 18 via the input circuit 25, the control circuit 32 starts the abnormality occurrence process shown in FIG. In this abnormality occurrence process, first, in step S1 (hereinafter, "step" is omitted), a telephone line is captured. That is, when relay B is activated, relay contacts bl and b2 are switched to disconnect the telephone 14 from the telephone line 12, and at the same time, when relay C is activated, relay contacts cl and c2 are switched to disconnect the primary winding of the transformer circuit 28 from the telephone line 12. Connect to. This results in the same state as when the handset of telephone 14 is taken off-hook. Next, S2 is 40 from the exchange side for seizing the telephone line.
The presence or absence of a 0Hz dial tone is checked based on the detection output of the dial tone detection circuit 42, and if the dial tone is normally obtained, the process proceeds to S3.
Proceed to. In addition, if you do not get a dial tone in S2, during a call,
It is determined that the telephone line is ringing or there is an abnormality in the line, and the telephone line is opened in S8, that is, relays B and C are restored, and the line acquisition in S1 is repeated again. If you proceed to S3 with the dial tone obtained, the dialer circuit 4
4, a PB double signal audio amplifier 46 consisting of a combination of multi-frequency signals, a transformer circuit 28 and a relay contact cl
, c2 to the telephone line 12. Subsequently, in S4, it is checked whether or not there has been a polarity change due to off-hook of the called party. If there is no polarity reversal, the process advances to S9, and if a predetermined period of time has not elapsed, the process returns to S4 to check whether or not there is a polarity reversal, and this check for polarity reversal is repeated for a predetermined period of time. In addition, if polarity reversal is not obtained even after a certain period of time has elapsed, steps S9 to 88 are performed.
Go to and open the phone line. 8 when it is determined in S4 that there is a polarity change due to off-hook of the called party.
Proceeding to step 5, the voice synthesis circuit 48 is activated and, for example, a voice message indicating the occurrence of a fire is read out from the memory circuit 50.
Send as abnormal information. Next, in 86, it is checked whether there is a polarity change due to the on-hook of the notification destination, and the sending of the abnormality information in S5 is repeated until a polarity change is determined in S6. When polarity reversal is determined in S6, the telephone line 12 is opened by restoring relays B and C in S7. Next, the line monitoring process will be explained with reference to the operational flow diagram of FIG. First, the control circuit 32 checks whether or not the telephone is in use at Sl. That is, when the telephone is in use, the photodiode of the photocoupler 24 or 26 provided on the telephone line 12 is always in a light emitting state, and the in-use/calling signal detection circuit 30 detects whether the telephone is in use or not based on the received light output due to this constant light emission. If it is detected that the telephone line 12 is in use and the in-use detection signal is obtained, it is assumed that the telephone line 12 is in normal condition and the series of line monitoring processing ends. If the result of determining whether the telephone is in use is not obtained in Sl, the process advances to S2, and a check is made to see if there is a ringing signal. When there is a ringing signal due to a call from the other party, the photodiode of the photocoupler 24 or 26 provided in the telephone line 12 blinks, and based on the blinking light reception signal from the photocoupler 24 or 26, the in-use/calling signal is detected. The detection circuit 30 produces a ringing signal detection output, which allows the control circuit 32 to determine that there is a ringing signal, and if there is a ringing signal, the telephone line 1
2 is normal, so the series of processing ends. In S2, if a calling signal is not obtained, the process proceeds to S3 and the telephone line is captured. That is, relays B and C
to activate relay contact b1. Phone 14 by switching b2
At the same time, the primary winding of the transformer circuit 28 is connected to the telephone line 12 by switching the relay contacts C1 and c2. Next, at 84, it is determined whether there is a dial tone. That is, relay contact c
When the primary winding of the transformer circuit 28 is connected to the telephone line 12 by switching l and c2, the state is the same as when the telephone 14 is off-hook, and since a 400Hz dial tone is received from the exchange, this dial tone is used as a dial tone. If the detection circuit 42 detects this and a normal dial tone is obtained, it is assumed that the telephone line 12 is in normal condition and the series of line monitoring processing ends. If a dial tone is not obtained in S4, the process proceeds to S5, and checks whether the line monitoring process has been performed multiple times, for example, three times. If it is less than three times, the process proceeds to S6, and relays B and C are processed.
When the telephone line 12 is restored, the telephone line 12 is released, and the process returns to Sl again to repeat the same line monitoring process. When the third line monitoring process is determined in 85 by repeating the line monitoring process from 81 to S4, the process proceeds to 87, and the control circuit 32 uses the voice synthesis circuit 48 to
The speaker 56 is driven by the audible alarm signal from the amplifier 54 to sound an alarm, thereby notifying the telephone line 12 that there is a line abnormality. Incidentally, the line monitoring process shown in FIG. 3 can be executed at sufficiently short time intervals compared to the conventional periodic notification, so that line abnormalities in the telephone line 12 can be monitored in substantially real time. Further, the line abnormality detection device of the present invention may be used in combination with conventional line abnormality monitoring based on periodic reporting, for example, once a day.

【Effect of the invention】

As explained above, according to the present invention, the telephone line is detected to be in use, the ringing signal is detected, and the dial tone is detected at predetermined intervals, and if none of the detection results are obtained, it is determined that the line is abnormal. and emit an alarm sound, it is possible to detect abnormalities in the telephone line without actually using the telephone line.
Since it is not subject to operational constraints like conventional periodic reporting, it is possible to monitor line abnormalities in almost real time. Additionally, unlike conventional periodic reporting, line abnormalities can be detected without actually using the telephone line, so there are no call charges and operational costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention; FIG. 2 is an operational flow diagram showing abnormality occurrence processing of the present invention; FIG. 3 is an operational flow diagram showing line monitoring processing of the present invention. In the figure, 10: Automatic notification device 12: Telephone line 14: Telephone 16: Gas detector 18: Fire detector 20: Receiver 22: Pendant sensor 24.26: Photocoupler 25: Input circuit 28 Nidorance circuit 30: In use /Call signal detection circuit (polarity reversal detection circuit) 32: Control circuit (CPU) 34: Display circuit 36: Operation circuit 38: Setting numeric keypad switch 40.50: Memory circuit 42: Tone detection circuit 44: Dialer circuit 46 :Audio amplifier 48:Audio synthesis circuit 52:Band pass filter 54:Amplifier 56:Speaker

Claims (1)

[Claims] 1. In the event of an abnormality such as activation of a connected security sensor such as a fire or gas detector or operation of an emergency push button, a pre-specified location such as the central monitoring center or a person's home etc. An automatic reporting system that automatically reports abnormality information to a reporting destination includes: a telephone-in-use detection unit that detects that a telephone line is in use; a ringing signal detection unit that detects a ringing signal of the telephone line; , a dialing tone detecting unit that captures the telephone line when the telephone is in use and a ringing signal cannot be detected by the telephone in-use detecting unit and the ringing signal detecting unit, and detects a dialing tone sent from the exchange; a control unit that operates the telephone in-use detection unit, the ring signal detection unit, and the dial tone detection unit at predetermined time intervals, and determines that there is a line abnormality when no detection signal is detected from any of the detection circuits, and issues an alarm sound; A line abnormality detection device for an automatic reporting system, characterized by being provided with.