JPH02109198A - Multiple point monitoring device - Google Patents

Abstract

PURPOSE:To reduce a cost by reducing the mumber of transmission lines by providing plural TV cameras arranged at plural monitoring points, and a means to send video signal selectively from the TV camera together with an identification signal. CONSTITUTION:Identification code attaching devices 14-16 are connected to the TV cameras 11-13, respectively, and an (identification code + video signal) is sent from each camera to each input terminal of a matrix switch(SW) 21. A synchronizing and separator circuit 22 separates a synchronizing signal from the video signal from the output terminal of the SW 21, and inputs it to a genlock circuit 24 together with a reference signal S2 arriving from a control signal generator 23. The circuit 24 performs the phase synchronization of the signal S2 from the generator 23 with the synchronizing signal separated from the video signal, and locks the video signals of the cameras 11-13 with the signal S2 completely. In such a way, the timing of a control signal S1 to switch the SW 21 can surely be performed by the end timing of the video signal, and the signal can be transmitted via one transmission line 30.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-point monitoring device, and particularly to a multi-point monitoring device suitable for monitoring images taken at a large number of monitoring points on a monitor at a remote location. Regarding.

(Prior art) Figure 3 is a schematic diagram of a conventional multi-point monitoring device, in particular, it selectively displays images captured by multiple TV cameras installed in remote locations on multiple monitors installed at a center. This is an example of a case in which the image is displayed at 91.!12.
93...9n are multiple TV cameras installed at multiple monitoring points, each TV camera 91,! 12.93
...The images captured by 9n are transmitted through transmission lines 21°, 22.
23...2n to the center. The images sent through the transmission lines 21, 22, 23, .
．． 62.83...6n. By the way, the matrix switcher 53 is controlled by the microcomputer 52, and selects the desired image based on the control input input from the evening terminal 51, and which TV 81, 62, 63...6n. Control is performed as to whether an image is to be displayed.

The operation of this configuration will be explained below.

TV camera! Images of multiple monitoring points captured at 11, 92, 93...9n are constantly transmitted through the transmission line 21, 22.
．． 23...211 to the matrix switcher 53. Monitoring points required by the center operator and the monitor/television FI that should display them
+, 62.63...6n is input from the terminal 51, and the microcomputer 52 controls the 7-trix switcher 53 to select the TV cameras 9+, 92.9.
3...9n is selected and the image is displayed on the designated monitor/television 61, 62, 63...6n.

(Problems to be Solved by the Invention) However, such conventional configurations have the following problems.

First, transmission lines 21, 22, 23...20 connect to each TV.
TV because it is installed every camera 9+, 92.93-9n
When the number of right cameras 1,92°93...9n is large, the number of transmission lines 21,22,23...2n increases, and the number of steps required to install them becomes extremely large. In particular, T
If the distance between the location of V right camera 1, 92, 93...9n and the center for monitoring is significant, transmission line 2
1. ．． 22.23...2n requires a large amount of wiring material, resulting in huge installation costs.

Also, if the TV right camera 1, 92, 93...9n location and the center location are affected, it is necessary to install boosters to compensate for the attenuation of the image signal, but the number of boosters installed is limited to the transmission line. 21.22.23...2n numbers are required, and the installation locations are TV right camera 1, 92.93...
・In order to be located between the location of 9n and the center, a new power supply etc. will have to be installed, which will require a very large amount of installation cost.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to reduce the number of transmission lines installed while making it possible to send images from a large number of monitoring points to a center. The object of the present invention is to provide a multi-point monitoring device that makes it possible to reduce such construction costs.

Signals from a plurality of TV cameras are sent through one transmission line, and images from the plurality of TV cameras can be monitored on one screen via a memory means on the receiving side.

(Means for Solving the Problems) In order to achieve the object, the present invention selectively uses a plurality of TV cameras installed at a plurality of monitoring points and video signals from the plurality of TV cameras together with an identification signal. a transmission line for transmitting the signal from the transmission means, a discrimination means for discriminating the identification signal inputted via the transmission line, and an identification signal inputted via the transmission line based on the discrimination result of the discrimination means. The apparatus includes a storage means for storing the video signals from the plurality of TV cameras in a predetermined area, and a means for taking out the video signals of the plurality of TV cameras from the storage means and displaying them on one screen of the display means.

[For production]

By means of the notation, the multi-point monitoring device of the present invention adds an identification signal to a video signal to differentiate it (Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a multi-point monitoring device according to an embodiment of the present invention. As shown in the figure, TV camera ++, +z4j
An identification code adding device 1415.16 is connected to each of the . As a result, identification coder video signals are sent from each camera to each input terminal of the matrix switch (SW) 21. Switching control of the matrix 5W21 is performed by the control signal generator 23 outputting the control signal SI, but in order to ensure that the switching is performed at the timing of the end of the video signal, the synchronous separation circuit 22 first controls the switching of the matrix 5W21. The synchronization signal is divided from the video signal from the output terminal of the IIJ# signal generator 2.
The sync signal separated from video No. 48 is input to the generator circuit 24 together with the reference signal S2 coming from the control No. 8 light generator 23, and the synchronization signal separated from the video No. 48 is phase-synchronized with the reference signal S2 output from the control No. 8 light generator 23. The video signal of +2.13 and the reference No. S2 are completely locked. This results in
In the control signal generator M23, the control signal Sl
By using a counter or the like, it is possible to switch the matrix 5W21 at any timing (an example of a time chart for the transmission line 30 is shown in FIG. 4). The second configuration is the transmitting unit 20.

Next, the identification code-attached video signal that has passed through the matrix 5W21 passes through the transmission line 30 and is sent to the receiving unit 40.

In the receiving unit 40, first the input video signal is ^10
Encoded by the converter and memory controller]・Roller 4
3 is input.

In order to discriminate the identification code, the continuous video signal coming from the transmission line 30 is discriminated by the identification code discriminating circuit 42. Then, the memory controller 43 determines which TV left camera the input video signal is from based on the determination result of the determination circuit 42, and stores the video signal in a predetermined area of the memory 44. The memory controller 43 converts this video signal into multi-freeze mode, takes it out from the video signal 44, converts it into analog at the D/^ converter 45, and outputs it to the monitor 46 in a multi-screen format.

The PU 47 performs these controls, and displays information from the character generator 48 on the multi-screen video on the monitor 46, and determines which screen has which T.
V Display the left camera.

The above is an explanation of the operation in the embodiment shown in FIG. The receiving unit 40 can be automated and the transmission line 30 can be unified.

Next, the block and time chart of the identification code adding device will be explained with reference to FIG.

First, the block diagram will be explained with reference to FIG. 2A.

TV camera IJ: mixing synchronization signal, vertical synchronization signal, 11
(Horizontal synchronization) Blanking signal is counter 2
will be sent to. Counter 2 counts this and inputs this information to CPII 3.

Several bits of identification signal information are input in advance to the CPU 3, and the switches (SW) 5 to 1" and 0°
Switch it with . The vertical synchronization signal of the T Shikatara 1 is used as a clear pulse for the counter 2 via the gate 6. Roughly, the H blanking signal is used as a switching signal for the video/identification No. 18 changeover switch (SW) 4 via the gate 7, and the switch is made to the video signal side after checking the state in which the addition of the identification signal is completed.

〔Effect of the invention〕

As described above, according to the present invention, when a large number of monitoring points are monitored from one prominent center, it is not necessary to install a transmission line corresponding to each TV camera installed at each monitoring point. Therefore, even when monitoring a distant place or a wide area, it is possible to significantly reduce the cost of laying a transmission line and the number of man-hours, and it is possible to realize an economical system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a multi-point monitoring device according to an embodiment of the present invention, FIG. 2 is a block diagram and time chart of an identification code adding device, and FIG. 3 is a block diagram of a conventional multi-point monitoring device. FIG. 4 is a time chart of the transmission line. +1. +2. Ill TV left camera 14.15. L...Identification code adding device, 20...
Transmission unit, 21... Matrix 5W1 22... Synchronization separation circuit, 23... Control signal generator, 24... Genrotsuta circuit, 30... Transmission line, 40... Receiving unit, 41... - A/D converter, 42...Identification code determination, 43...Memory controller, 44...Memory, 45...I-converter, 46...Monitor, 47...CPU. 48...Character generator.

Claims (1)

[Claims] 1) A plurality of TV cameras installed at a plurality of monitoring points, a transmission means for selectively transmitting video signals from the plurality of TV cameras together with an identification signal, and a transmission line for transmitting the signals from the transmission means. , a discriminating means for discriminating the identification signal inputted via the transmission line, and a storage means storing the video signal inputted via the transmission line in a predetermined area based on the discrimination result of the discriminating means; A multi-point monitoring device characterized by comprising means for extracting video signals from the plurality of TV cameras from the storage means and displaying them on one screen of the display means.