JPH04167637A - Time division multiple transmission system - Google Patents

Abstract

PURPOSE:To perform speech with high quality by preventing a transmission noise from being put on a speech signal due to crosstalk by stopping the polling transmission of a time division multiplex transmission signal in a busy state. CONSTITUTION:The supervision and control of a terminal are performed by the polling transmission by which the time division multiplex transmission signal is transmitted from a central unit 1 to each terminal sequentially via a signal line. In such a case, when the return signal of the speech call of the terminal provided with an interphone function makes access the terminal, speech connection is performed at the central supervisory panel 1 by transmitting control data which connects the interphone function of each terminal to a speech line 5 when the terminal provided with the interphone function between a caller side and a caller side, and after the speech connection is performed, the polling transmission by the time division multiplex transmission signal is stopped until the speech is completed. In other words, the polling transmission of the time division multiplex transmission signal is stopped in the busy state. Thereby, it is possible to prevent the transmission noise from being put on the speech signal due to the crosstalk, and to perform the speech with high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multiplex transmission system used in a remote monitoring and control system used in apartment complexes and the like.

[Prior Art] Conventionally, this type of remote monitoring and control system transmits a time-division transmission signal from a central monitoring panel 1 via a signal line 2 to a housing information board 3 or a lobby intercom 4 by polling, as shown in FIG. The housing information board 3 and lobby intercom 4 are monitored and controlled by providing control data or sending back monitoring information.

The time division multiplex transmission signal includes address data for calling the address of the housing information panel 3 and lobby intercom 4, which are terminal devices, control data for control, and a return waiting period signal for setting the period for transmitting the reply signal. configured and transmitted in bipolar baseband format. In this case, the housing information panel 3 and lobby intercom 4, which are terminals, rectify and smooth the time-division transmission signal and use it as a power source for a logic circuit.

By the way, this type of remote monitoring and control system is equipped with an interphone function in the lobby intercom 4 and the housing information panel 3 (and also in the central monitoring panel 1 if necessary). Alternatively, if there is a calling operation on the calling operation unit (not shown) provided in the central monitoring board 1), when accessed by the above polling transmission, the calling data is returned to the central monitoring board 1, and the central monitoring board 1 Based on this returned call data, the calling terminal
When accessing the terminal on the called side, each interphone function (or the interphone function of the central monitoring board 1)
It is now possible to connect to telephone lines and make calls using the intercom function. In addition, the housing information panel 3 is equipped with means for detecting a fire sensor, gas leak sensor, emergency button, electric lock release switch, fire line disconnection, gas leak sensor disconnection, and residence power disconnection, and the central monitoring panel 1 When accessed from , each monitoring information is returned. Also, lobby intercom 4 is centrally monitored! ! ■There is a call port! In addition to i5 and signal line 2, electric lock line 6 and power line 7
A signal from the electric lock release operation unit is sent to the central monitoring board 1, and the control signal from the central monitoring board 1 unlocks the electric lock through the electric lock control board 9 installed at the common entrance 8. It is now possible to lock it. Unlocking of this electric lock is also performed using monitoring information from each dwelling unit information board 3 based on the operation of the unlock switch.

[Problems to be Solved by the Invention] By the way, in the above-mentioned remote monitoring and control system, since the time-division multiplex transmission signal is constantly polled and transmitted, and power is also supplied, crosstalk occurs during a call using the interphone function, and the call There was a problem with transmission noise being heard inside.

The present invention has been made in view of the above-mentioned problems, and its purpose is to stop the transmission of time division multiplexed transmission signals during a call using the intercom function, thereby reducing the deterioration of call quality due to crosstalk. The purpose of the present invention is to provide a time division multiplexing transmission method that prevents

In addition to the above-mentioned object, the invention as claimed in claim 2 provides a time division multiplex transmission capable of transmitting this request to the central monitoring board when it becomes necessary to send emergency monitoring information from the terminal device to the central monitoring board. There is a method to provide.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the invention according to claim 1 provides a method for sequentially transmitting time division multiplexed transmission signals from a central monitoring board to each terminal device via a signal line. In a time-division multiplex transmission system that monitors and controls terminals through polling transmission, if a reply signal to a call from a terminal with an intercom function is received when the terminal is accessed, the central monitoring board will notify the calling and called parties. When a terminal device with an intercom function is accessed, the control data for connecting the intercom function of each terminal device to the telephone line is transmitted using a time division multiplex transmission signal to establish a telephone call. This is characterized in that polling transmission using division multiplex transmission signals is stopped.

The invention recited in claim qI2 is the invention recited in claim 1, in which, in the terminal device having a function of returning emergency monitoring information, the signal line voltage is shortened while the polling transmission is stopped, and the polling transmission restart request signal is centrally transmitted. It is characterized by being given to the monitoring board.

[Operations] According to the present invention, polling transmission of time-division multiplexed transmission signals is stopped during a call, so transmission noise is not added to the call signal due to crosstalk, and high-quality calls can be made.

In addition, terminal devices that have a function to return emergency monitoring information short-circuit the signal line voltage while polling transmission is stopped and send a polling transmission restart request signal to the central monitoring board, so even if transmission is stopped, urgent monitoring information In the event of an occurrence, polling transmission can be restarted and monitoring information can be checked on the central monitoring board, making it possible to reliably deal with emergencies.

[Example] The present invention will be explained below with reference to Examples.

FIG. 1 shows a schematic configuration of a central monitoring board 1 used in the embodiment system, and this central monitoring board 1 performs normal polling transmission using a time division multiplex transmission signal transmitting circuit 1a,
A time-division multiplex transmission signal is sent out to
The monitoring information returned by the PU1c is interpreted. The transmission data of the time division multiplexed transmission signal is the main C
The information created and read by the PL 11d is taken into the main CPU 1d, and based on the content of the information, alarms, displays, and signal processing such as sending control signals to the electric lock control panel 9 are performed via the I10 boat 1e. is now being done.

As shown in FIG. 2, in the time division multiplex transmission system of the present invention, polling transmission using the time division multiplex transmission signal is stopped until the intercom function is connected to the telephone line 5 and the call is terminated. , a voltage is applied to the signal line 2 during this stop period. As a result of this voltage application, the photocoupler 1a is turned on in the central monitoring board 1, and the interrupt input terminal I of the main CPU 1d becomes an L" state. The main CPU 1d checks whether or not an interrupt has occurred using the state of this interrupt input terminal ■ while polling transmission is stopped. Monitor.

On the other hand, the residence information panel 3 and lobby intercom 4 monitor the detection signals of various sensors and the operation unit even during a call, and during this monitoring, fire line disconnections, gas disconnections, and residence power disconnections that do not require an emergency are performed. If there is a monitoring input such as this, it is sent back to the central monitoring board 1 as monitoring information by polling transmission that is resumed after the end of the call.

On the other hand, if there is a monitoring input such as fire detection, gas leak detection, emergency button operation, electric lock unlocking operation, etc. that requires an emergency, the signal line voltage is short-circuited at the terminal device, that is, the housing information panel 3 or the lobby intercom 4.

Due to this short circuit, the photocoupler 1b is turned off in the central monitoring board 1, and the interrupt input terminal ■ of the main CPU 1d becomes "
H", the main CPU 1d determines that the emergency monitoring information has been input to one of the housing information panels 3 or the lobby intercom 4, restarts polling, causes the terminal in question to send back the monitoring information, and sends the monitoring information. After this confirmation, if the call has not ended yet, polling transmission is canceled and the call connection state is restored.

To end a call, limit the call time using a timer, or generate an interrupt similar to the emergency monitoring information interrupt described above to restart polling transmission, and at this time send a reply signal indicating the end of the call to the terminal. This is done by sending a reply from the server to the central monitoring board 1.

Of course, the call termination process may be performed using any other suitable method.

[Effects of the Invention] The present invention provides an intercom system in a time division multiplex transmission system in which terminal equipment is monitored and controlled by polling transmission in which time division multiplex transmission signals are sequentially transmitted from a central monitoring board to each terminal equipment via signal lines. If a reply signal for a call call from a terminal with the function is received when the terminal in question is accessed, the central monitoring board will call the intercom function of each terminal when the calling and called parties access the terminal with the interphone function. A call is established by transmitting control data to connect to the line using a time division multiplex transmission signal, and after the call is connected, polling transmission using the time division multiplex transmission signal is stopped until the end of the call. Since the polling transmission of the division multiplex transmission signal is stopped, transmission noise is not added to the call signal due to crosstalk, and a high quality call can be made.

The invention according to claim 2 is the invention according to claim 1, in which, in the terminal device having a function of returning emergency monitoring information, the signal line voltage is short-circuited while the polling transmission is stopped, and the polling transmission restart request signal is centrally transmitted. Since the information is sent to the monitoring board, even if polling transmission is stopped, if urgent monitoring information occurs, polling transmission can be restarted and the monitoring information can be checked on the central monitoring board, making it possible to reliably deal with emergency situations. effective.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a central monitoring board used in an embodiment of the present invention;
FIG. 2 is a flow chart similar to the above, and FIG. 3 is a configuration diagram of a remote monitoring and control system using time division multiplex transmission used in the present invention. 1 is a central monitoring board, 1a is a time division multiplex transmission signal multiplication circuit,
1b is a photocoupler, 1c is a signal reading CPU, 1d is a main CPtJ, 2 is a signal line, 3 is a housing information board, 4 is a lobby intercom, and 5 is a telephone line. Agent Patent Attorney Ishi 1) Chief 7L is the central monitoring board 1a is the time division multiplex transmission signal transmission circuit lb is the photocoupler 1c is the CPU for signal interpretation Figure 1 1d is the main CPU

Claims (2)

[Claims] (1) In a time-division multiplex transmission system that monitors and controls terminal devices by polling transmission, in which time-division multiplex transmission signals are sequentially transmitted from a central monitoring board to each terminal device via signal lines.
If a reply signal for a call from a terminal with an intercom function is received when the terminal in question is accessed, the central monitoring board will activate the intercom function of each terminal when the calling and called parties access the terminal. A time division multiplex transmission characterized in that a call is established by transmitting control data connected to a telephone line using a time division multiplex transmission signal, and after the call is connected, polling transmission using the time division multiplex transmission signal is stopped until the end of the call. method. (2) In a terminal device having a function of returning emergency monitoring information, when the polling transmission is stopped, the signal line voltage is short-circuited and a polling transmission restart request signal is given to the central monitoring board. time division multiplex transmission method.