JPH11103355A - Remote supervisory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote supervisory system in which a forward path and a return path are used for data and a voice signal. SOLUTION: When a terminal 2 controls a telephone mode of a line 8, a control signal is sent to a terminal 1 and a switch 14 of a line changeover circuit 13 of the terminal 1 is thrown to a position of a telephone set section 17. A switch 24 of a line changeover circuit 23 of the terminal 2 is thrown to a position of a telephone set section 27 to send a voice signal from the terminal 2 to the terminal 1. In this case, a data signal is sent from the terminal 1 to the terminal 2 via a line 9. When the terminal 1 controls a telephone mode of the line 9, a control signal is sent to the terminal 2 and a switch 26 of a line changeover circuit 23 is used to connect a lien branch section 25 and the telephone set section 27. A switch 15 of the line changeover circuit 13 of the terminal 1 is switched to the position of the telephone set section 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a remote monitoring system, and more particularly to a data / voice transmission system in a remote monitoring system.

[0002]

2. Description of the Related Art A remote monitoring and control device is a device for controlling equipment in a station building that is operated unattended in a center located at a location remote from the location via a transmission line composed of a wired line or a wireless line. This is a device for controlling and monitoring equipment. The remote monitoring control device performs full-duplex communication of control / monitoring data in a normal state, and can make a voice call between the center and the office when necessary.

There are four-wire and two-wire data and voice transmission paths. The four-wire system is composed of two pairs of reciprocating tracks, and the outbound and return routes are completely independent. On the other hand, the two-wire system uses a pair of lines like a subscriber line of a public telephone, and uses a hybrid circuit to share the outward and return routes.

A line used in a remote monitoring control device for a broadcasting station uses a wired four-wire system or a wireless line. Normally, this line is connected to the control and
An audio signal is multiplexed with the monitoring data. For example, a voice signal uses a band of 0.3 to 1.8 kHz, and control / monitoring data uses a band of 1.8 to 3.4 kHz.

At this time, the transmission speed of the control / monitoring data is limited to 200 bps. If the transmission speed is increased, the control / monitoring data overlaps with the audio signal band. Control and monitoring become impossible.

Japanese Patent Application Laid-Open No. 62-200856 has a telephone for transmitting and receiving voice signals via a public telephone line and a hybrid circuit for data transmission, and switches between the telephone and the hybrid circuit. A system having a switch has been proposed.

[0007] Further, it has a transmitter, a receiver and a half-duplex communication modem used for performing data transmission, and has a timer unit for switching between the transmitter and the receiver at regular intervals.

That is, in a device provided with a plurality of terminals having a function of performing one-way communication of data via a half-duplex communication modem to a device which performs two-way communication of voice signals, the terminals are connected by a telephone line. I do. Normally, two-way communication of voice signals is performed, and when a data transmission request is made from one terminal, the other terminal side is connected to the hybrid circuit side for transmitting and receiving data transmission from the telephone side for transmitting and receiving voice signals. Switch the switch to receive data.

Similarly, on one terminal side, a switch is switched from the telephone side to the hybrid circuit to transmit data. The timer section counts the clock provided by the clock generation section, and switches between the transmitting side and the receiving side after a predetermined time has elapsed. When there is a voice call request instruction signal, both terminals switch the switch to the telephone side, and perform two-way communication of the voice signal.

[0010]

Problems to be Solved by the Invention JP-A-62-2008
In the case of the proposal described in Japanese Patent Application Publication No. 56-56, when audio signals are bidirectionally communicated via a two-wire transmission line, a data transmission request is sent to both terminals by a hybrid circuit that transmits and receives data. At this time, the transmission line is used as a line dedicated to data transmission.

For example, it has been impossible to transmit a data signal from one terminal to another terminal and transmit a voice signal from the other terminal to one terminal. When it is necessary to transmit an audio signal from either terminal to the other terminal, it is necessary to switch the changeover switch of both terminals to the telephone side to enter the audio signal transmission mode.

That is, there is a choice between transmitting only a voice signal or transmitting only a data signal on a transmission line. Further, in order to frequency-multiplex and transmit a voice signal and a data signal on the same transmission line, the transmission speed of the data signal needs to be 200 BPS or less. Since the transmission frequency and the occupied frequency of the audio signal overlap, realization was impossible.

It is an object of the present invention to provide a remote monitoring system that can use the forward path and the return path independently for data and voice signals.

[0014]

A remote monitoring system according to the present invention comprises a first terminal provided in a remote monitoring control device, a second terminal provided in a center, and the first and second terminals. It is configured with two pairs of first and second lines to be connected, and from the first terminal to the second terminal with the first line,
A remote monitoring system for transmitting a voice signal or a data signal from the second terminal to the first terminal on the second line, wherein the voice signal or the signal is independently transmitted through the first and second lines. It is characterized by including independent transmission control means for controlling transmission of a data signal.

Further, the independent transmission control means can be controlled from both the first and second terminals.

Further, the audio signal or the data signal alone or a signal obtained by multiplexing the audio signal with the data signal is transmitted through the first and second lines.

The operation of the present invention is as follows. The transmission line has a two-line configuration (four-wire system), and is divided into one line for transmitting data from one terminal to the other terminal and the other line for transmitting data from the other terminal to one terminal, whereby a data signal is transmitted. It is possible to individually select the type of signal transmitted on one line and the type of signal transmitted on the other line.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a remote monitoring system according to the present invention.

In FIG. 1, the remote monitoring system according to the present invention comprises terminals 1 and 2 provided in a remote monitoring control device and a center, and lines 8 and 9 connecting the terminals 1 and 2. The terminals 1 and 2 are provided with modulators 11 and 21 for modulating and transmitting data, and a demodulator 1 for demodulating received data.
2, 22; line switching circuits 13 and 23 for switching data and voice signals; and telephone units 17 and 27 for voice calls.

Further, the line switching circuit 13
And a switch 15 for connecting the line 9 to the modulator 11 or the telephone unit 17, and a line switching circuit 23.
The switch 24 connects the line 8 to the modulator 21 or the telephone unit 27, and the line 9 connects the demodulator 22 and the switch 26.
And a switch 26 for connecting / disconnecting the telephone 27 to / from the circuit branch 25.
It consists of.

In the operation of the embodiment of the present invention, normally, the switch 24 in the line switching circuit 23 of the terminal 2 is
The switch 14 in the line switching circuit 13 of the terminal 1 is directed to the demodulator 12. At this time,
The modulator 21 and the demodulator 12 perform data communication via the line 8. The switch 15 in the line switching bribe 13 of the terminal 1 is directed to the modulator 11 and sends out a data signal via the line 9.

On the terminal 2 side, the line switching circuit 2
The data signal is branched to the demodulator 22 and the telephone unit 27 at the signal branching unit 25 of No. 3. The signal branching unit 25 and the telephone unit 27 of the line switching circuit 23 are connected to a switch 26.
Are separated by When the terminal 2 performs the telephone mode control on the line 8 side, a control signal is sent to the terminal 1,
In the terminal 1, the switch 14 of the signal switching circuit 13
To the telephone unit 17.

By switching the switch 24 of the line switching circuit 23 in the terminal 2 to the telephone unit 27 side after a certain time after the transmission of the control signal, it becomes possible to transmit a voice signal from the terminal 2 to the terminal 1. . At this time,
A data signal is transmitted from the terminal 1 to the terminal 2 via the line 9. When the terminal 1 performs the telephone mode control on the line 9 side, a control signal is sent to the terminal 2, and the line branching unit 25 and the telephone unit 27 are connected by the switch 26 of the line switching circuit 23.

In the terminal 1, after transmitting the control signal, and after a certain period of time, the switch 1 of the line switching circuit 13
5 is switched to the telephone unit 17. When the terminal 1 performs data transmission mode control on the line 9 side, the line switching circuit 1
3 is switched to the modulator 11 side, and the signal branching unit 25 and the telephone unit 27 are separated by the switch 26 of the line switching circuit 23.

Further, when the terminal 1 controls the data transmission mode on the line 8 side, a control signal is transmitted to the terminal 2 via the line 9 and the switch 24 of the line switching circuit 23 is switched to the modulator 21 side. At the same time, after the control signal is transmitted, the switch 14 of the line switching circuit 13 is switched to the demodulator 12 side after a lapse of a predetermined time.

In the terminal 1, when the voice signal transmission mode control of the line 8 is performed, the switch 14 of the line switching circuit 13 is switched to the telephone unit 17 and a control signal is transmitted to the terminal 2. After receiving the signal, the switch 24 of the line switching circuit 23 is set to the telephone unit 2.
Switch to 7 side. Control for switching the line 8 to the telephone unit can be performed from either the terminal 1 or the terminal 2.

[0028]

As described above, according to the present invention, the transmission line is composed of two lines, one line for transmitting data from one terminal to the other terminal, and the other for transmitting data from the other terminal to one terminal. Data lines, full-duplex communication of data signals can be performed, and it is possible to individually select the type of signal transmitted on one line and the type of signal transmitted on the other line. There is an effect that makes it possible.

The changeover switch on one line side and the changeover switch on the other line side are formed as separate circuits, each of which operates independently, thereby transmitting an audio signal on one line and transmitting data on the other line. Can transmit signals.

Further, since it is not necessary to multiplex and transmit the voice signal and the data signal on both lines, the transmission speed of the data signal is determined without worrying that the transmission frequency of the data signal overlaps with the voice signal. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

 1,2 terminal 8,9 lines 11,21 modulator 12,22 demodulator 13,23 line switching circuit 14,15,24,26 switch 17,27 telephone unit 25 circuit branching unit

Claims (3)

[Claims] 1. A first terminal provided in a remote monitoring control device, a second terminal provided in a center, and two pairs of first and second lines connecting the first and second terminals. And transmitting a voice signal or a data signal from the second terminal to the first terminal on the second line from the first terminal to the second terminal on the first line. A remote monitoring system, comprising: independent transmission control means for controlling transmission of the voice signal or the data signal independently through the first and second lines. 2. The remote monitoring system according to claim 1, wherein said independent transmission control means can be controlled from both said first and second terminals. 3. The audio signal or the data signal alone, or a signal obtained by multiplexing the audio signal with the data signal is transmitted through the first and second lines. Remote monitoring system.