JP3673313B2 - Monitoring information acquisition device and remote monitoring system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a monitoring information acquisition device that transmits input monitoring information to a remote monitoring device via an ISDN network (service integrated digital communication network), and a remote monitoring system using the monitoring information acquisition device. .
[0002]
[Prior art]
In a remote monitoring system in which a monitoring information acquisition device installed at a monitoring point and a monitoring device installed on the supervisor side are connected by an ISDN line, the monitoring device transmits an image or sound sent from the monitoring information acquisition device. The monitoring information is provided to the monitoring person by receiving and playing back the monitoring information. The monitoring information acquisition device has a function of preventing a person other than the monitoring person from pulling out the monitoring information. For example, the apparatus disclosed in Japanese Patent Application Laid-Open No. 2-155350 rejects an incoming call when the calling subscriber number and calling subaddress included in the call setting message of the ISDN network do not match those set in advance. As a result, the management information is transmitted only to a specific monitoring device. Note that the calling subscriber number is determined by the subscriber line (termination device) of the ISDN network to which the device that sends the call is connected.
[0003]
[Problems to be solved by the invention]
In the above conventional technique, since the monitoring information acquisition device protects the monitoring information based on call setting information such as a calling subscriber number, the subscriber lines to which the monitoring device can be connected are limited. That is, the monitoring device cannot be used on a plurality of subscriber lines, or cannot be used on another subscriber line after changing the arrangement.
[0004]
Therefore, an object of the present invention is to provide a monitoring information acquisition apparatus that supplies monitoring information only to a supervisor without using call setting information.
[0005]
It is another object of the present invention to provide a remote monitoring system using the monitoring device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a monitoring information acquisition apparatus connected to a monitoring apparatus via an ISDN line, and encodes the captured monitoring information, input means for capturing monitoring information representing an image and sound. An encoding means; a communication means for receiving call setting information from the monitoring apparatus side; and starting transmission and reception of information with the monitoring apparatus; a detection means for detecting a password from the received information; Determining means for determining whether or not the detected password matches a predetermined value, and if determined to match, the encoded monitoring information is sent from the communication means to the monitoring device It is characterized by comprising control means for transmitting to. The apparatus according to the present invention detects the password received following the call setting information, and transmits the monitoring information only when the detected password matches a predetermined value known by the monitoring person. That is, the monitoring information can be supplied only to the supervisor without using the received call setting information.
[0007]
Further, the present invention is a remote monitoring system comprising the above-described monitoring information acquisition device and a monitoring device connected to the monitoring information acquisition device via an ISDN line, and the monitoring device includes the monitoring information acquisition device and the monitoring information acquisition device. Communication means for transmitting and receiving information between, a password received from a supervisor, a means for transmitting the received password from the communication means, and decoding the monitoring information received by the communication means Means for reproducing the image and sound obtained by the above. In the system according to the present invention, since the monitoring information acquisition device determines whether or not the monitoring information can be transmitted by using a password, the monitoring device can be connected to any subscriber line of the ISDN network.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
FIG. 1 is a configuration diagram of a remote monitoring system according to an embodiment of the present invention. The remote monitoring system is a system in which a monitoring device 1 installed on a supervisor side and a monitoring information acquisition device 2 installed at a monitoring point are connected by an ISDN network 3. The monitoring information acquisition apparatus 2 includes a video camera 21, a microphone 22, and a monitoring information transmission apparatus 23, and transmits monitoring information including monitoring target image data and audio data to the monitoring apparatus 1 through the ISDN network 3. The monitoring device 1 includes a display 11, a speaker 12, and a monitoring information receiving device 13, and receives and reproduces monitoring information sent from the monitoring information acquisition device 2. As shown in the figure, in this remote monitoring system, the monitoring information acquisition device 2 can be connected to any number of subscriber lines in the ISDN network. Similarly, a plurality of monitoring devices 1 can be connected to an arbitrary subscriber line, and can be transported and connected to another subscriber line.
[0010]
FIG. 2 shows the configuration of the monitoring device 1 and the monitoring information acquisition device 2.
[0011]
The monitoring information receiving device 13 in the monitoring device 1 includes a network interface / line control unit 50 that controls communication with the ISDN network 3, a CPU 51 that controls each unit of the monitoring information receiving device 13, a control program and received data. A memory unit 52 for storing received data, a multimedia demultiplexing unit 53 for separating received frames and converting transmission rates, a key input unit 54, a buffer 55, and an image and audio for decoding received image data and audio data. A codec 56 and a signal converter 57 for converting the decoded data into a signal of the management information output unit 14 are provided. The management information output unit 14 corresponds to the display 11 and the speaker 12 in FIG.
[0012]
On the other hand, the monitoring information transmission device 23 in the monitoring information acquisition device 2 includes a network interface / line control unit 60, a CPU 61 that controls each unit of the monitoring information acquisition device 2, and an access management unit 62 for protecting the monitoring information. , An image / audio codec unit 63 that encodes an image signal and an audio signal input from the management information input unit 14, and a memory unit 64, which are transmitted when a line is connected, and generate data that becomes a noise image or sound during reproduction An initial information generating unit 65, a switch 66, and a multimedia demultiplexing unit 67 for generating a transmission frame and converting a transmission rate. The management information input unit 14 corresponds to the video camera 21 and the microphone 22 in FIG.
[0013]
FIG. 3 shows a more specific configuration of the monitoring information acquisition apparatus 2. The network interface / line control unit control unit 60 in FIG. 2 includes an interface unit 601 for matching with the ISDN network 3 and a line control unit 602 for performing line connection control. The multimedia demultiplexing unit 67 includes a demultiplexing unit 671 that demultiplexes received frames, a multiplexing unit 672 that multiplexes transmission frames, and a control unit 673 that controls the demultiplexing unit 671 and the multiplexing unit 672. The image / audio codec unit 63 includes a code decoding unit 631 and a digital / analog conversion unit 632. The memory unit 64 includes a program memory 641 that stores control programs for the CPU 61 and the line control unit 602, and a transmission memory 642 that temporarily stores image data processed by the audio / video codec 63. . The access management unit 62 includes an interface unit 621, a timer 622 that measures a certain period, a self password memory 623 that stores a self password that is set in advance, and a password comparator 624 that compares the self password and the received password. Composed.
[0014]
FIG. 4 is a sequence diagram of communication performed between the monitoring device 1 and the monitoring information acquisition device 2. In the figure, a small arrow indicates a D channel signal of the ISDN user / network interface, and a large arrow indicates a B channel signal.
[0015]
First, in the monitoring device 1 on the transmission side, the administrator inputs the subscriber number assigned to the monitoring information acquisition device 2 through the key input unit 54. The input subscriber number is sent to the ISDN network 3 through the buffer 55, the demultiplexing unit 53, and the network interface / line control unit 50 under the control of the CPU 51. Thereby, call setting information is transmitted to the monitoring information acquisition apparatus 2 as a D channel signal. Upon receiving this, the network interface / line control unit 60 of the monitoring information acquisition device 2 on the receiving side outputs a ringing tone as necessary, transmits a response signal to the ISDN network 3, and the first B channel for transferring image data. Connect with. Communication similar to the above is performed again, and the second B channel for transferring audio data is set between the apparatuses 1 and 2. And the monitoring apparatus 1 transmits the request | requirement for setting the logical data communication port for password transmission to one part of two B channels. The monitoring information acquisition apparatus 2 that has received this request sets a data communication port and sends a response signal.
[0016]
Next, the monitoring device 1 transmits the password input to the key input unit 54 by the monitor using the set data communication port. The access management unit 62 of the monitoring information acquisition device 2 compares the password received from the monitoring device 1 with a preset own password, and if they match, the encoded image data is used using two B channels. And voice data (monitoring information). This transmission data is received by the monitoring device 1, passes through the memory unit 52 and the multimedia demultiplexing unit 53, is decoded by the video / audio codec, and is reproduced by the monitoring information output unit 14. If the passwords do not match, the monitoring information acquisition apparatus 2 disconnects and releases the line using the D channel and ends the communication.
[0017]
FIG. 5 shows a detailed operation sequence of the monitoring information acquisition apparatus 2 after line setting.
[0018]
After setting the B channel and the data communication port, the CPU 61 of the monitoring information acquisition apparatus 2 sets the timer 622 of the access management unit 62 according to the incoming call signal (reception at the data communication port) from the multimedia demultiplexing unit 67. to start. Then, the self password memory 623 is requested to output the self password, and the switch 66 selects the output of the initial information generating unit 65. As a result, the data generated by the initial information generation unit 65 is transmitted to the monitoring device 1 through the switch 66, the multimedia demultiplexing unit 67, and the network interface / line control unit 60 through the set B channel.
[0019]
During this time, the password comparator 624 sequentially compares the received data of the multimedia demultiplexing unit 67 and the own password output from the own password memory 623 bit by bit, and outputs the comparison result to the CPU 61. If the comparison results match, the CPU 61 causes the switch 66 to select the output of the image / audio memory 642. As a result, the encoded image data and audio data are transmitted to the receiving device via the set B channel. If the comparison results do not match, or if the measurement end notification is received from the timer 622 before the comparison results are input, the CPU 61 instructs the network interface / line control unit 60 to disconnect the line.
[0020]
As described above, in the remote monitoring system of this embodiment, the security of monitoring information is maintained, and the monitoring device 1 can be connected to any subscriber line of the ISDN network 3. Further, the generated data of the initial information generating unit 65 that becomes noise during reproduction prompts the person who mistakenly connects to the monitoring information acquisition apparatus 2 to disconnect the line early. Further, by limiting the password acceptance period by the timer 622, it is possible to prevent the erroneous connection state from being prolonged.
[0021]
Although the configuration and operation related to communication of monitoring information have been described above, this monitoring system can also transmit image data and audio data from the monitoring device 1 and reproduce it by the monitoring information acquisition device 2. . Using this function, the administrator can issue various instructions to the operator on the monitoring information acquisition apparatus 2 side. Further, by using a small display device such as a liquid crystal panel as the display 11, the monitoring device 1 can be realized as a portable device. Further, the data generated by the initial information generation unit 65 may instruct the input of a password during reproduction.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the monitoring information acquisition apparatus which supplies monitoring information only to a supervisor can be provided, without utilizing call setting information.
[0023]
Further, a remote monitoring system using the monitoring device can be provided.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a remote monitoring system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a monitoring device and a monitoring information acquisition device.
FIG. 3 is a block diagram showing a detailed configuration of a monitoring information acquisition apparatus.
FIG. 4 is a sequence diagram showing a communication procedure between a monitoring device and a monitoring information acquisition device.
FIG. 5 is a sequence diagram showing the operation of the monitoring information acquisition apparatus after line setting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Monitoring device, 11 ... Display, 12 ... Speaker, 13 ... Monitoring information receiving device, 14 ... Monitoring information output part, 2 ... Monitoring information acquisition device, 21 ... Video camera, 22 ... Microphone, 23 ... Monitoring information transmission device, 24 ... Monitoring information input unit, 3 ... ISDN line, 50,60 ... Network interface / line control unit, 51,61 ... CPU, 52, 64 ... Memory part, 53, 67 ... Multimedia demultiplexing part, 56, 63 ... Video / audio codec, 54 ... Key input part, 55 ... Buffer, 57 ... Signal conversion unit, 62 ... Access management unit, 65 ... Initial information generation unit, 66 ... Switch, 601 ... Interface unit, 602 ... Line control unit, 621 ... Interface unit, 622... IMA, own password memory, 624, password comparator, 631, ... encoder / decoder, 632, digital-analog converter, 671, separation unit, 672, multiplexing unit , 673 ... control unit, 641 ... program memory, 642 ... memory for transmission.

Claims (2)

A monitoring information acquisition device connected to the monitoring device by an ISDN line,
Input means for capturing monitoring information representing images and sounds;
Encoding means for encoding the captured monitoring information;
Communication means for receiving call setting information from the monitoring device side and starting transmission and reception of information with the monitoring device;
Detection means for detecting a password from the received information;
Determining means for determining whether or not the detected password matches a predetermined value;
Control means for transmitting the encoded monitoring information from the communication means to the monitoring device when it is determined that they match,
Means for generating initial information, and
The initial information is an abnormal image or sound when reproduced,
The control means transmits the generated initial information from the communication means after the call setting information is received until the judgment means judges whether it matches or does not match. Information acquisition device. The monitoring information acquisition device according to claim 1 ,
Timer means for measuring a predetermined length of time from the time when the communication means starts communication,
The control unit causes the communication unit to disconnect the line when the determination by the determination unit is not made before the measurement by the timer unit is completed.

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