JPH09135242A - Remote supervisory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote supervisory system capable of perfectly separating a speech signal and a supervisory signal transmitted through a single communication line from each other without any the omission of a supervisory control signal. SOLUTION: In a master station 1, at the time of generating the supervisory control signal, a cell forming and separating part 12 adds a prescribed header to data to prepare a cell for monitor control and stores it in a memory 13, and on the other hand a cell forming and separating part 16 prepares the voice signal digital-encoded by a voice digital conversion part 15 receiving the voice of telephone to be a voice cell and stores it in a memory 17. A branch insertion part 18 reads out the cell for monitor control or the voice cell stored in the memory 13 or 17 by preferring the voice cell to the cell for supervisory control to output to an opposite station, and on the other hand, sorts cells received from the opposite station into cells for supervisory control or voice cells to output the cell for supervisory control to the memory 13 and the voice cells to the memory 17. The cell forming and separating parts 12 and 16 separates a signal. A slave station 2 is also provided with the same function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors and controls a remote station and a master station which monitors and controls the slave station via a single communication line, and at the same time, performs a telephonic discussion call. More specifically, the present invention relates to a remote monitoring system in which a supervisory control signal and a voice signal can be completely separated on one communication line and almost all data can be transmitted.

[0002]

2. Description of the Related Art Conventionally, in a remote monitoring system of this type, a supervisory control signal and a voice signal for a meeting telephone are allocated to one speech channel in a time-division manner, and a supervisory control and a meeting telephone speech channel. Form a significantly cheaper system configuration than building them separately.

This technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-2219.
No. 72 publication. In this device, as shown in FIG. 2, a monitoring station 80, which is a master station, is connected to a monitored station 90, which is a slave station, via a communication channel 30.

As shown in the figure, the monitoring station 80 has a drop / insert circuit 82, a voice recognition circuit 83, and a signal switching circuit 84 for the monitor control signal circuit 11 and the consultation telephone voice circuit 14, respectively. A circuit 82 is connected to the call channel 30 to input / output a monitor control signal and a voice signal to / from the monitored station 90. On the other hand, the monitored station 90
Is a supervisory control signal circuit 21 and a voice circuit 2 for a meeting telephone.
4, and the add / drop circuit 92.
Connects to the call channel 30 and inputs and outputs a monitor control signal and a voice signal to and from the monitor station 80.

Normally, the monitoring station 80 constantly requests the monitored station 90 for monitoring control information from the monitoring control signal circuit 11, and the monitored station 90 requests the monitoring control signal from the monitoring control signal circuit 21 in response to this request. The information is returned to the monitoring station 80.

On the other hand, when a voice signal is generated in the meeting telephone voice circuits 14 and 24 of the monitoring station 80 and the monitored station 90, the voice signal recognition circuit 83 of the monitoring station 80 is transmitted to the meeting telephone voice circuit 14. The input / output voice signal is recognized, the signal switching circuit 84 is notified, and the request for the monitor control information transmitted from the monitor control signal circuit 11 is interrupted. When the generation of the voice signal is interrupted, the request for the monitor control information is restarted.

[0007]

In the above-mentioned conventional distant monitoring system, the voice signal recognition circuit of the monitoring station recognizes the voice signal input to and output from the voice circuit for the meeting telephone and notifies the signal switching circuit to monitor and control. The request for supervisory control information sent by the signal circuit is interrupted. According to this configuration, since the request for the supervisory control information is interrupted after recognizing the voice signal, the tail of the request signal being transmitted is lost, the voice signal and the supervisory control signal coexist temporarily on the communication channel, There is a problem that the response of the information requested by the monitoring station may be lost or the like occurs, and a means for avoiding a failure caused by this is needed.

An object of the present invention is to provide a remote monitoring system in which a voice signal and a supervisory control signal transmitted by one communication line can be completely separated and the supervisory control signal is not lost.

[0009]

A remote monitoring system according to the present invention monitors and controls a remote station through a communication line connecting a remote station and a master station for monitoring and controlling the remote station. In a remote monitoring system for making a discussion call according to the above, the slave station and the master station are provided with a memory for temporarily storing a monitor control signal to be transmitted to the communication line, and the monitor control signal is transmitted during the silent period during the call period. When a voice is generated, the voice is transmitted prior to the supervisory control signal.

Further, according to the present system, a supervisory control signal and a voice signal in a meeting call are digitally encoded to form a cell with a short fixed length of data, and one of the supervisory control signal and the voice signal is transmitted by the communication. When a voice cell is generated by a voice signal when the voice cell is transmitted to the line, the voice cell is transmitted with priority over the supervisory control cell by the supervisory control signal.

Further, one of the concrete means provided by the present invention is that the communication line is a dedicated digital line, and when a supervisory control signal is generated in each of the master station and the slave station,
A supervisory control cell forming / separating unit that extracts and outputs a supervisory control signal from the received supervisory control cell while creating and temporarily storing a supervisory control cell by adding a predetermined header to short fixed-length data and a meeting A voice-to-digital converter that encodes and outputs a digital code when receiving a voice from a telephone, and decodes an input voice signal to output as voice, and a voice encoded from the voice-to-digital converter The signal is formed into short fixed-length data, a predetermined header is added to create a voice cell for temporary storage, and the voice signal is separated from the received voice cell to separate the voice signal from the voice digital conversion unit. Output to the voice cell formation / separation unit, the supervisory control cell formation / separation unit, and either one of the supervisory control cell and the voice cell created by the voice cell formation / separation unit, and monitors the voice cell. While taking priority over the control cell and outputting it to the other station, the cell received from the other station is classified into a supervisory control cell and a voice cell and the supervisory control cell is formed in the supervisory control cell formation separation unit. , And the add / drop unit that outputs the voice cells to the voice cell forming / separating unit.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In the remote monitoring system shown in FIG. 1, the master station 1 which is a monitoring station and the slave station 2 which is a monitored station are provided with a supervisory control signal circuit 11 and 21, a supervisory control cell formation separating unit 12 and 22, and a supervisory control signal forming circuit. Control cell memory 13, 23,
The call telephone voice circuit 14/24, the voice digital conversion unit 15/25, the voice cell forming / separating unit 16/26, the voice cell memory 17/27, and the add / drop unit 18/28 are provided. It is assumed that they are connected by the dedicated digital line 3. In addition, dedicated digital line 3
Is a transmission rate of 64 KBPS corresponding to one speech channel.

The monitoring control signal circuit 11 sends a control signal for controlling the monitoring of the slave station 2, and receives a monitoring signal of the monitoring result from the slave station 2 and sends it to a display section (not shown) for display. The monitoring control signal circuit 21 receives a control signal from the master station, and returns the result of monitoring based on the control signal by the monitoring signal. From here, the control signal and the supervisory signal will be generically described as the supervisory control signal.

The cell formation / separation section 12/22 for supervisory control is
When a supervisory control signal in digital code is received from the supervisory control signal circuits 11 and 21, a supervisory control header is added, a supervisory control cell of a predetermined short fixed length is created, and a FIFO is formed.
Cell memory 13 for supervisory control by (first-in first-out) method
・ While writing to 23, cell memory for monitoring control 13 ・ 23
The cells stored in the memory are sequentially read, the header is deleted, the supervisory control signal is separated, and the supervisory control signal circuit 11.2.
Send to 1.

On the other hand, the meeting telephone voice circuits 14 and 24 are used to convert the meeting call voice from the telephone into a voice digital converter 15.
Give and receive with 25. The voice digital conversion units 15 and 25 digitally encode the received voice signals by PCM (Pulse Code Modulation) modulation to form voice cell formation and separation units 16 and 26.
On the other hand, the digital signal received from the voice cell forming / separating unit 16/26 is demodulated into a voice signal and transmitted to the voice circuit 14/24 for the consultation telephone.

When the voice cell forming / separating unit 16/26 receives the voice signal by the digital code from the voice / digital converting unit 15/25, the voice cell forming / separating unit 16/26 adds a voice header to create a voice cell of a predetermined short fixed length. While writing to the voice cell memory 17/27 by the FIFO method, the voice cell memory 17/2
The stored cells are sequentially read from the cell No. 7, the header is deleted, the audio signal is separated, and the audio digital conversion unit 15/25.
Send to

The add / drop unit 18, 28 outputs the output readys of the supervisory control cell memories 13, 23 and the voice cell memories 17, 27 to the supervisory control cell memory 13, normally.
・ Priority is given to the audio cell memories 17 and 27 over 23, and the cell data with output ready turned on is read and sent to the dedicated digital line 3, while the header of the cell data received from the dedicated digital line 3 is analyzed. Then, the supervisory control cell or the voice cell is identified, the supervisory control cell is written in the supervisory control cell memories 13 and 23, and the voice cell is written in the voice cell memories 17 and 27. As a result, in the supervisory control cell, the output ready of the voice cell memories 17 and 27 is in the OFF state, and the supervisory control cell memory 13
Only when the output ready 23 is turned on, the data is read by the add / drop units 18 and 28 and sent to the dedicated digital line 3.

When the output readys of the supervisory control cell and the voice cell are turned on at the same time, the voice cell is normally prioritized and the add / drop unit 18
When the output ready of the voice cell is turned on while the supervisory control cell is already being transmitted, the voice cell remains stored in the voice cell memory 17/27. It is waited in the state of, and is transmitted after the transmission of the monitoring control cell is completed.

In the above description, the cells are transmitted through the dedicated digital line at the transmission rate of 64 KBPS corresponding to one speech channel, but the transmission rate by another transmission method applied to the dedicated digital line may be used.

Further, although it has been described that the voice cells are stored and stored in the voice cell memory of the FIFO system, the voice cell forming / separating unit has only two buffer memories for alternately writing and reading, and one of the voice cells is provided. If there is a voice cell, the stored voice cell is transmitted with priority over the supervisory control cell, and when the voice cell transmission time comes while the supervisory control cell is transmitting, this head voice cell is discarded. The subsequent voice cells may be continuously transmitted. In this case, only the first voice cell for a short time is discarded, so that it does not matter for the call.

[0022]

As described above, according to the present invention, the slave station and the master station are provided with the memories for temporarily storing the supervisory control signals for supervisory control to be sent out on the communication line, and the voice control is performed during the talk period. A distant monitoring system is provided in which the monitoring control signal is sent to a communication line during a time period, and when a sound is generated, the sound is prioritized and sent to the monitoring control signal. With this configuration, it is possible to completely separate the voice signal and the supervisory control signal sent to one communication line, and prevent the supervisory control signal from being lost.

Further, when the supervisory control signal and the voice signal are digitally encoded to form a cell with a short fixed length of data, and one of the supervisory control signal and the voice signal is sent to one communication line, By the generation of the voice cell by the voice signal, it is possible to obtain the distant monitoring system in which the voice cell is transmitted with priority over the monitor control cell by the monitor control signal. With this configuration, it is possible to prevent loss of both the audio signal and the monitor control signal.

[Brief description of the drawings]

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

FIG. 2 is a functional block diagram showing an example of the related art.

[Explanation of symbols]

 1 Master station (monitoring station) 2 Slave station (monitored station) 3 Dedicated digital line 11, 21 Supervisory control signal circuit 12, 22 Supervisory control cell formation separation unit 13, 23 Supervisory control cell memory 14, 24 For consultation telephone Voice circuit 15, 25 Voice digital conversion unit 16, 26 Voice cell forming / separating unit 17, 27 Voice cell memory 18, 28 Drop / insert unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H04Q 9/00 311

Claims (4)

[Claims] 1. A remote monitoring system for monitoring and controlling via a single communication line connecting a remote station and a master station for monitoring and controlling the remote station, and a remote monitoring system for holding a talk by telephone. And a memory for temporarily storing a supervisory control signal for supervisory control to be sent to the communication line to the master station, and transmitting the supervisory control signal to the communication line during a silent period of a call period to generate a voice. In this case, the remote monitoring method is characterized in that the voice is transmitted prior to the monitor control signal. 2. A remote monitoring system in which a remote station and a master station for monitoring and controlling the remote station are monitored and controlled via one communication line and a teleconference is performed by telephone. And a memory for temporarily storing a supervisory control signal for a supervisory signal to be sent to the communication line in the master station, and digitally encoding the supervisory control signal and the voice signal by the discussion call to form a cell with a short fixed length data. In addition, when either one of the supervisory control signal and the voice signal is transmitted to the communication line, the voice cell is generated by the voice signal, so that the voice cell is transmitted with priority over the supervisory control cell by the supervisory control signal. Remote monitoring method characterized by: 3. A distant monitoring system in which a remote station and a master station for monitoring and controlling the remote station are monitored and controlled via one communication line, and a teleconference is performed by telephone. The line is a dedicated digital line, and when a supervisory control signal is generated in each of the master station and slave stations, a predetermined header is added to the data of a short fixed length to create a supervisory control cell and temporarily stored. On the other hand, when receiving the voice of the conference call and the supervisory control cell formation separation unit that extracts and outputs the supervisory control signal from the received supervisory control cell,
An audio digital conversion unit that decodes an input encoded audio signal and outputs the audio while encoding and outputting the encoded digital audio signal, and a short fixed-length unit that receives the encoded audio signal from the audio digital conversion unit A voice cell forming / separating unit that forms a voice cell by adding a predetermined header to the data, temporarily stores the voice cell, and separates the encoded voice signal from the received voice cell to output to the voice digital converting unit. And one of the supervisory control cell and the voice cell created by the supervisory control cell formation / separation unit and the voice cell formation / separation unit, the voice cell is taken out prior to the supervisory control cell, and the other station On the other hand, the cell received from the other station is classified into a supervisory control cell and a voice cell, and the supervisory control cell is formed in the supervisory control cell forming / separating unit, and the other voice cell is formed in the voice cell. Remote monitor system, characterized in that it comprises a drop unit that outputs the separated portion. 4. The remote monitoring system according to claim 3, wherein the add / drop unit sends the supervisory control cell and the voice cell to the communication line at a transmission rate of 64 KBPS.