JP2821377B2 - Line monitoring equipment for video signals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal line monitoring apparatus which is applied to a remote monitoring system for grasping the situation of a site from a remote place and automatically monitors the line state of a video signal.

[0002]

2. Description of the Related Art A remote monitoring system for grasping the situation of a site from a remote place, for example, monitors the construction status of a dam or the inside of a hazardous material storage, or the progress of work processes in a company to another place. It is used in various industrial fields, such as performing production management while grasping while staying.

In a video signal line monitoring apparatus applied to the above-mentioned remote monitoring system, an operator or the like sequentially selects a channel for converting a high-frequency signal into a video signal as a method for examining the line state of the video signal. The line state of the video signal was visually inspected by converting the high-frequency signal corresponding to the changed channel into a video signal and sequentially displaying the video signal on a monitor or the like.

[0004]

In the conventional video signal line monitoring apparatus described above, a channel for converting a high-frequency signal into a video signal is sequentially selected by an operator or the like in order to investigate the line state of the video signal. Video on a monitor or the like. Therefore, if there is an abnormality such as a video signal line disconnection on a certain channel,
There was a problem that it took time and trouble to investigate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a video signal line monitoring apparatus which automates the line monitoring of a video signal and facilitates maintenance and maintenance of the line.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a video signal line monitoring apparatus for monitoring a site situation from a remote place, and an ITV camera for imaging the site situation,
A modulator that converts a video signal captured by a V camera into a high-frequency signal and sets a different frequency channel for each ITV camera; and a distributor that synthesizes / distributes the high-frequency signal converted by the modulator. A plurality of on-site monitoring devices, a demodulator for performing processing of converting a high-frequency signal sent from the plurality of on-site monitoring devices into a video signal, and detecting the presence or absence of the video signal; A line monitoring unit including a controller for sequentially selecting the frequency channel, a display for displaying a list of the presence or absence of video signals corresponding to the plurality of frequency channels sequentially selected by the controller, and the plurality of site monitoring devices. A demodulator that converts the high-frequency signal sent from the receiver into a video signal, and an arbitrary frequency chip for this demodulator. A remote monitoring device including an operating device for setting a channel, and a monitor TV for displaying an image of a relevant site based on an image signal corresponding to the arbitrary frequency channel set by the operating device. Features.

[0007]

The situation of each site is imaged by the ITV camera of each of the plurality of site monitoring devices, and each video signal is converted into a high-frequency signal by a modulator in which a different frequency channel is set for each ITV camera. The converted high-frequency signals are combined by the distributors in the plurality of on-site monitoring devices, and are distributed to the demodulators of the line monitoring unit and the remote monitoring device installed at locations remote from the respective sites. Next, a controller in the line monitoring unit sequentially selects different frequency channels set for each of the modulators. Next, the demodulator in the line monitoring unit converts a high-frequency signal corresponding to the frequency channel selected by the controller into a video signal, detects a synchronization signal included in the video signal, and outputs the information. To the controller. The controller having received the information transmits the detection signal to the display, and displays a list of the presence or absence of the video signal on the display for each of the plurality of frequency channels selected by the controller.

Next, the operator grasps the line condition from the presence or absence of the video signal for each of the plurality of frequency channels displayed on the display, and if any line abnormality is found in the line of the video signal in a certain frequency channel. Investigate the site monitoring equipment when it is received.

As described above, a plurality of different frequency channels are sequentially selected by the controller in the line monitoring unit, a demodulator converts a high-frequency signal corresponding to the selected channel into a video signal, and Since the presence or absence of the converted video signal is displayed in a list on the display every time, the line monitoring of the video signal can be automated. As a result, it is possible to constantly monitor the line.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a video signal line monitoring apparatus according to an embodiment of the present invention.

In FIG. 1, reference numerals 1a to 1c denote site monitoring devices installed at each site. This site monitoring device 1a-1
c comprises an ITV camera 2, a modulator 3, and a distributor 4, respectively. The ITV camera 2 displays the situation of each site to be monitored and sends each video signal to the modulator 3. Different frequency channels are assigned to the modulators 3 of the site monitoring devices 1a to 1c, respectively. The modulator 3 converts the video signal into a high-frequency signal and sends it to the distributor 4. The distributor 4 in the on-site monitoring device 1a and the distributor 4 in the on-site monitoring device 1b are connected in a bus shape by a coaxial cable 5. Similarly, the distributor 4 in the site monitoring device 1b and the distributor 4 in the site monitoring device 1c
Are connected by a coaxial cable 5.

The distributor 4 combines and distributes the high-frequency signal converted by the modulator 3. On-site monitoring equipment 1
The high-frequency signals synthesized by the distributors 4a to 1c are transmitted from the distributor 4 in the on-site monitoring device 1c via the coaxial cable 5 to the monitoring unit 6 installed at a location remote from each site.
Sent to

The monitoring unit 6 includes a distributor 7, a line monitoring unit 8, and a remote monitoring device 9. The distributor 7 distributes the synthesized high-frequency signal transmitted from the distributor 4 of the site monitoring device 1c to the line monitoring unit 8 and the remote monitoring device 9, respectively. The line monitoring unit 8 includes a demodulator 10, a controller 11, and a display 12, and the distributed high-frequency signal is input to the demodulator 10. The demodulator 10
Is connected to the controller 11. Controller 11
Sequentially selects different frequency channels assigned to each of the modulators 3 of the site monitoring devices 1a to 1c, and transmits the selected frequency channels to the demodulator 10. For the distributed high-frequency signal, the demodulator 10 converts a high-frequency signal corresponding to the frequency channel selected by the controller 11 into a video signal, and detects a synchronization signal included in the video signal. Thereby, the demodulator 10 detects the presence or absence of the video signal. Further, the controller 11 is connected to the display 12. The display 12 displays a list of the presence / absence of a video signal corresponding to each frequency channel selected by the controller 11.

The high frequency signal distributed and output by the distributor 7 and transmitted to the remote monitoring device 9 is input to the demodulator 13 in the remote monitoring device 9. An operating device 14 is connected to the demodulator 13. This operating device 14
The demodulator 13 is controlled by selecting a different frequency channel set in the modulator 3 of each of the on-site monitoring devices 1a to 1c. The demodulator 13 converts a high-frequency signal corresponding to the frequency channel selected by the operation device 14 into a video signal and outputs the video signal to the monitor TV 15. The monitor TV 15 displays an image of a corresponding site based on the converted video signal. The remote monitoring device 9 includes a demodulator 13, an operating device 14, and a monitor TV 15.

Next, the operation of the above embodiment will be described.
Three ITs in the site monitoring devices 1a to 1c shown in FIG.
The image of each site situation projected by the V camera 2
The signals are respectively sent to three modulators 3 to which different frequency channels are assigned, and are converted into high-frequency signals.
The high-frequency signals converted by the three modulators 3 are combined in the distributors 4 of the site monitoring devices 1a to 1c. Next, the synthesized high-frequency signal is
The signal is output from the distributor 4 in the on-site monitoring device 1c to the distributor 7 in the monitoring unit 6 via the coaxial cable 5. Distributor 7
Distributes and outputs the synthesized high-frequency signal to the demodulator 10 in the line monitoring unit 8 and the demodulator 13 in the remote monitoring device 9.

The synthesized high-frequency signal is supplied to a demodulator 10
Is input to the site monitoring device 1
A different frequency channel set in each of the modulators 3a to 1c is sequentially selected and transmitted to the demodulator 10. The demodulator 10 converts a high-frequency signal corresponding to the frequency channel selected by the controller 11 into a video signal. Further, the demodulator 10 detects a synchronization signal included in the video signal, and outputs the information to the controller 11. That is, the demodulator 10 sequentially converts a high-frequency signal into a video signal for each frequency channel sequentially selected by the controller 11, and sequentially sends a synchronization signal included in the video signal to the controller 11. The controller 11 having received the above information sends a detection signal indicating “there is a video signal” to the display 12.

If the demodulator 10 does not detect a synchronization signal included in the converted video signal, no detection information is sent to the controller 11. Therefore, no detection signal is output from the controller 11, and the controller 11 displays the line abnormality, date and time, location, and the like of the corresponding frequency channel on the display unit 12. Through the above process, the controller 11 determines whether or not there is a video signal converted by the demodulator 10 for each frequency channel.
In the list.

Here, the display 12 of the line monitoring unit 8 includes:
The presence or absence of a video signal is displayed for each frequency channel. The operator uses the operation device 14 to select, for example, a frequency channel considered to be a line abnormality to the demodulator 13 based on the display result on the display device 12. For the high-frequency signal transmitted from the distributor 7, the demodulator 13
The high-frequency signal corresponding to the selected frequency channel is converted into a video signal and output to the monitor TV 15. Monitor T
V15 displays a video of the corresponding site based on the video signal. The operator monitors and grasps the situation at the site based on the image.

As described above, the line monitoring unit 8 including the demodulator 10, the controller 11, and the display 12 is provided, the controller 11 sequentially selects a plurality of different frequency channels, and the demodulator 10 Since the high-frequency signal is converted into a video signal, and the presence or absence of the converted video signal is displayed on the display 12 for each of the plurality of frequency channels, the unmanned, that is, automatic, line monitoring of the video signal is achieved. It becomes possible. As a result, since the line of the video signal can be constantly monitored, even if a trouble such as a line disconnection occurs, information on the date, time, location, and the like is immediately found, and maintenance of the line is promptly performed. be able to. Therefore, maintenance of the line becomes easy.

[0020]

As described above, according to the present invention,
A controller in the line monitoring unit sequentially selects a plurality of different frequency channels, converts the selected high-frequency signal into a video signal by a demodulator, detects the presence or absence of the video signal, and outputs the line status to a display. This makes it possible to automate the monitoring of the line of the video signal, thereby facilitating the maintenance and maintenance of the line.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a video signal line monitoring apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1a-1c On-site monitoring equipment 2 ITV camera 3 Modulator 4,7 Distributor 5 Coaxial cable 6 Monitoring unit 8 Line monitoring unit 9 Remote monitoring device 10,13 Demodulator 11 Controller 12 Display 14 Operation unit 15 Monitor TV

Claims (1)

(57) [Claims] A video signal line monitoring device for monitoring the situation of a site from a remote location, comprising: an ITV camera for capturing an image of the site; a video signal captured by the ITV camera being converted into a high-frequency signal;
A plurality of on-site monitoring devices including a modulator in which a different frequency channel is set for each ITV camera, and a distributor for synthesizing / distributing a high-frequency signal converted by the modulator; A demodulator that performs a process of converting the high-frequency signal sent from the device into a video signal and detects the presence or absence of the video signal, a controller that sequentially selects the frequency channel for the demodulator, and a controller A line monitoring unit including a display unit that displays a list of the presence or absence of video signals corresponding to a plurality of frequency channels sequentially selected; and a process of converting a high-frequency signal sent from the plurality of site monitoring devices into a video signal. Demodulator to perform, an operating device for setting an arbitrary frequency channel for the demodulator, and an operating device set by the operating device. The arbitrary based on the video signal corresponding to the frequency channel, corresponding field line monitoring apparatus of the video signal, characterized by comprising a remote monitoring device comprising a monitor TV to view the picture of.