JP2004056502A - Video surveillance system - Google Patents

Abstract

A video surveillance system capable of distributing alarm information to all surveillance rooms even when a disaster prevention / crime prevention signal is issued in any surveillance area.
A management CPU (23) performs overall management in response to a request from each monitoring room (30a, 30b, ...). The monitoring room 30a converts a disaster prevention / security signal sent from various sensors into serial data by the S / P converter 33 and outputs the serial data to the control CPU 31. The control CPU 31 reads the alarm information from the alarm table based on the output of the S / P converter 33 and sends it to the management CPU 23. The management CPU 23 distributes the alarm information from the monitoring room 30a or the alarm information based on the disaster prevention / security signal input from the S / P converter 24 to all the monitoring rooms 30a, 30b,. Each of the monitoring rooms 30a, 30b,... Displays a specific monitoring image on the monitor TV 54 according to the distributed alarm information, and drives the buzzer 39 and the alarm lamp 55.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video surveillance system using, for example, a broadband LAN system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for the purpose of disaster prevention, crime prevention, etc. in a stadium or a building, for example, a video surveillance system based on a broadband LAN system using CATV technology has been used.
[0003]
2. Description of the Related Art A video surveillance system based on a broadband LAN system to which a conventional CATV technology is applied has a plurality of surveillance cameras installed in a predetermined surveillance area, and images taken by the respective surveillance cameras are modulated by modulators, respectively, and then frequency-multiplexed to broadband. The data is sent to a plurality of monitoring rooms via the LAN. In each surveillance room, images sent from each surveillance camera via a broadband LAN are selected by a tuner, demodulated, and monitored by sequentially displaying them on a monitor. Further, each monitoring room has a function of controlling the monitoring direction and the like of each monitoring camera.
[0004]
In each monitoring room, a disaster prevention / security signal output from a disaster prevention sensor, a security sensor, or the like installed in a monitoring area is input, and an alarm operation is performed based on the disaster / security signal. I have.
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional video surveillance system, a disaster prevention / crime prevention signal is input from a disaster prevention sensor and a security sensor provided for each monitoring room, and an alarm is independently provided for each monitoring room. Has occurred. That is, in each monitoring room, an alarm is not generated for a disaster prevention / crime prevention signal generated in another monitoring room. For this reason, each monitoring room cannot know any disaster such as a fire that has occurred in the monitoring area of another monitoring room at all, and cannot deal with it. Also, if a disaster occurs in its own monitoring area, the monitoring room will contact other monitoring rooms as necessary, but due to the response to the disaster, communication can not be done, or communication will be delayed. There is a problem of doing.
[0006]
The present invention has been made in view of the above circumstances, and provides a video surveillance system capable of distributing alarm information to all surveillance rooms, regardless of which surveillance / security signal is issued in any surveillance area. With the goal.
[0007]
[Means for Solving the Problems]
The present invention provides a video surveillance system that receives surveillance video signals transmitted from a plurality of surveillance cameras via a main line in a plurality of monitoring rooms, demodulates the demodulated signals by a demodulator, and displays the demodulated images on a monitor TV.
A management CPU connected to the trunk line for managing the entire system, and a plurality of disaster prevention sensors provided in each monitoring area and disaster prevention / security signals sent from the security sensors converted into serial data to be used as the management CPU An S / P converter for outputting to
A control CPU provided in each of the monitoring rooms and controlling the demodulator under the control of the management CPU;
The management CPU distributes alarm information based on a disaster prevention / crime prevention signal output from the S / P converter to the control CPU in each monitoring room via the trunk line, and causes a specific monitoring image to be displayed on the monitor TV. It is characterized by.
[0008]
By providing the management CPU and managing the entire system as described above, the operations of all monitoring rooms can be integrated and controlled reliably and smoothly, and when a disaster prevention / security signal is issued in any monitoring area. However, alarm information can be distributed to all monitoring rooms, and it is possible to quickly deal with the occurrence of disasters, theft, and the like.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a system block diagram showing an overall configuration example of a video surveillance system based on the broadband LAN system to which the CATV technology is applied.
[0010]
As shown in FIG. 1, a plurality of monitoring cameras 1a, 1b,... Are installed in a monitoring area such as a stadium or a building. In this example, a case is shown in which a dome camera 1a, a camera with a camera platform 1b, and a fixed dome camera 1c are installed as surveillance cameras. The dome type camera 1a is installed, for example, on the ceiling 2 or the like, and can control a monitoring direction in any direction of up, down, left and right and has a zoom function. The camera b with the camera platform can be controlled by the camera platform 3 in any direction of up, down, left and right. The fixed dome type camera 1c is installed on the ceiling 2 or the like, and has a fixed monitoring direction. For example, about 76 cameras in total can be connected to one trunk line, but about 16 cameras can be simultaneously controlled from a plurality of monitoring rooms, for example.
[0011]
The cameras 1a, 1b,... Output, for example, video signals of the NTSC system as surveillance images. The surveillance image captured by the dome-shaped camera 1a is modulated by the modulator 4a, and then sent to the main line 20a of the broadband LAN via the coaxial cable 5a and the mixer 6a. The monitor image modulated by the modulator 4a is frequency-multiplexed by the mixer 6a to the transmission signal of the main line 20a, amplified by the bidirectional amplifier 21, and then sent to monitor rooms 30a, 30b,. .
[0012]
The control signal for the dome camera 1a sent from the monitoring rooms 30a, 30b,... Via the trunk line 20a is input from the mixer 6a to the camera control unit 7 via the coaxial cable 5a. The camera control unit 7 is configured by a high-frequency modem for reception (RF modem) 8 whose frequency is variable. The high-frequency modem 8 is a semi-fixed type that can set, for example, 16 channels in a frequency range of 25 to 49 MHz, demodulates a camera control signal sent from the monitoring room, and controls the direction and zoom magnification of the dome-shaped camera 1a. And so on. By setting a camera ID number for each camera, a plurality of cameras can be connected to one high-frequency modem 8 for control.
[0013]
The monitoring image taken by the camera 1b with the camera platform is modulated by the modulator 4b, and then sent to the main line 20a via the coaxial cable 5b and the mixer 6b. The monitoring image modulated by the modulator 4b is frequency-multiplexed by the mixer 6b to the transmission signal of the trunk line 20a, amplified by the bidirectional amplifier 21, and then sent to the monitoring rooms 30a, 30b,.
[0014]
Further, a control signal for the camera 1b with a camera platform transmitted from the monitoring room via the trunk line 20a is input to the camera platform controller 10 from the mixer 6b via the coaxial cable 5b. The camera platform controller 10 includes, for example, a variable-frequency receiving high-frequency modem (RF modem) 11, an MPU 12, and a relay 13. The high-frequency modem 11 is a semi-fixed type that can set, for example, 16 channels in a frequency range of 25 to 49 MHz, demodulates a camera control signal sent from the monitoring room, and inputs the demodulated camera control signal to the MPU 12. The MPU 12 controls the relay 13 in accordance with the control signal demodulated by the high-frequency modem 11, and controls the direction of the camera platform 3, that is, the monitoring direction of the camera 1b with camera platform.
[0015]
The monitoring image taken by the fixed dome camera 1c is modulated by the modulator 4c, and then sent to the main line 20a via the coaxial cable 5c and the mixer 6c. The monitoring image modulated by the modulator 4c is frequency-multiplexed by the mixer 6b to the transmission signal of the trunk line 20a, amplified by the bidirectional amplifier 21, and sent to the monitoring rooms 30a, 30b,...
[0016]
A management CPU 23 is connected to the trunk line 20a through a branching device 22, and monitoring rooms 30a, 30b,. The monitoring rooms 30a, 30b,... Are provided, for example, at about ten locations.
[0017]
The management CPU 23 manages the entire monitoring rooms 30a, 30b,..., And exchanges data with the monitoring rooms 30a, 30b,. The management CPU 23 includes an input device and a display device (not shown). The management CPU 23 is provided with an S / P (serial / parallel) converter for transmitting a plurality of disaster prevention / security signals sent from disaster prevention sensors and security sensors (not shown) provided at various places in the monitoring area. 24. Examples of the disaster prevention sensor include a smoke detection sensor and a fire detection sensor, and examples of the crime prevention sensor include an infrared intrusion detection sensor, a safe door opening detection sensor, and a door opening detection sensor.
[0018]
The S / P converter 24 has a plurality of input terminals, converts a disaster prevention / security signal input to each input terminal into serial data, and outputs the serial data. The disaster prevention / crime prevention signal is, for example, a signal that is normally “0” (off) and that is “1” (on) when an abnormality is detected. Since the S / P converter 24 converts the disaster prevention / security signal input to each input terminal into serial data in a predetermined order and outputs the serial data, the management CPU 23 can identify each sensor based on the bit position of the serial data. it can.
[0019]
Further, the management CPU 23 is provided with an alarm table in which serial data output from the S / P converter 24 and camera numbers of the monitoring cameras 1a, 1b,. In this alarm table, for example, each sensor is set as alarm information in association with the number of a monitoring camera that captures an image of a monitoring area in which the sensor is installed. In this case, the disaster prevention sensor, the security sensor, and the camera number may be in one-to-one correspondence, or one monitoring camera may correspond to a plurality of sensors in a specific area. The management CPU 23 reads out alarm information such as a camera number from the alarm table based on the disaster prevention / security signal output serially from the S / P converter 24 and distributes the alarm information to the monitoring rooms 30a, 30b,.
[0020]
Next, a detailed configuration of the monitoring room 30a will be described.
A control CPU 31 is provided in the monitoring room 30a. The control CPU 31 is connected to an alarm buzzer 39 for generating an alarm sound, a touch panel 32 is connected as an input device / display device, and furthermore, a disaster prevention sensor provided at various points in the monitoring area. , A disaster prevention / security signal sent from the security sensor is input via an S / P (serial / parallel) converter 33. In this case, the S / P converter 33 includes not only a disaster prevention / crime prevention signal in the monitoring area of the monitoring room 30a but also a disaster prevention / crime prevention signal from other paper areas as needed. Is entered. As an input device / display device for the control CPU 31, besides the touch panel 32, a control PC (personal computer) or the like can be used, and the input device and the display device may be provided separately. Further, a speaker may be used instead of the buzzer 39 that generates an alarm sound.
[0021]
The S / P converter 33 has a plurality of input terminals similarly to the S / P converter 24, and converts a disaster prevention / security signal input to each input terminal into serial data in a predetermined order for control. Output to CPU31. The control CPU 31 is provided with an alarm table in which each sensor is associated with the camera number of each monitoring camera 1a, 1b,... Similarly to the camera control device 2 described above. When a disaster prevention / security signal is issued from the disaster prevention sensor or the security sensor, the control CPU 31 outputs alarm information such as a camera number from the alarm table based on the serial data output from the S / P converter 33. The buzzer 39 and the alarm lamp 55 are driven as described later in detail, and the camera number is instructed to the MPU 41 of the four-wave demodulators 37a, 37b,..., And the monitoring image is selected according to the camera number. It is displayed on the monitor TV 54. At the same time, the control CPU 31 sends alarm information including the camera number and the like read from the alarm table to the management CPU 23.
[0022]
When alarm information is sent from the monitoring room 30a, the management CPU 23 distributes the alarm information to each of the monitoring rooms 30a, 30b,... Via a high-frequency modem (RF modem) 34. In this case, the management CPU 23 need not distribute the alarm information to the monitoring room to which the alarm information has been sent.
[0023]
The high-frequency modem 34 is connected to the control CPU 31. The high-frequency modem 34 is connected to the trunk line 20a via a branch 35a. The control CPU 31 exchanges data with the management CPU 23 via the high-frequency modem 34. In this case, the management CPU 23 polls the control CPU 31 using a frequency of 70.08 MHz, for example, and the control CPU 31 responds using a frequency of 44.48 MHz.
[0024]
The control CPU 31 is further connected to demodulators, for example, four-wave demodulators 37a, 37b,... Via a communication driver / receiver 36. Since the four-wave demodulators 37a, 37b,... Have the same configuration, the configuration of the four-wave demodulator 37a will be described.
[0025]
The four-wave demodulator 37a includes an MPU 41, a communication driver / receiver 42, a variable high-frequency modem (variable RF modem) 43 for transmitting a camera control signal, and tuners 44a to 44d. The four-wave demodulator 37a includes a light receiving unit 40 that receives infrared light sent from an infrared remote controller (remote controller) 38 and converts the infrared light into an electric signal. The electric signal converted by the light receiving unit 40 is input to the MPU 41. I do. The MPU 41 operates according to a control instruction given from the infrared remote controller 38. The remote controller 38 can give, for example, a camera selection instruction, a camera direction instruction, a screen selection instruction, and the like, as described in detail later.
[0026]
When an operation signal is input from the remote controller 38, the MPU 41 exchanges data with the control CPU 31 via the communication drivers / receivers 42 and 36, and in accordance with an instruction from the control CPU 31, a four-wave demodulator. Operation control within 37a is performed.
[0027]
When the number of the camera to be controlled is designated by the remote controller 38, the MPU 41 sets the frequency (channel) of the variable high-frequency modem 43 according to the instruction of the management CPU 23 after receiving the permission of the management CPU 23 via the control CPU 31. After that, a camera control signal corresponding to the remote control operation is output via the variable high-frequency modem 43. The variable high-frequency modem 43 can variably set 16 channels in a frequency range of, for example, 25 to 49 MHz by a control command given from the management CPU 23 via the control CPU 31 and the MPU 41, and a camera control signal output from the MPU 41 Is modulated and output to the trunk line 20a via the branching device 35b. The camera control signal output to the trunk line 20a is frequency-multiplexed and transmitted to the cameras 1a, 1b,.
[0028]
Note that when the number of the camera to be controlled is designated by the remote controller 38, the MPU 41 receives the permission of the management CPU 23 directly via the variable high-frequency modem 43 without passing through the control CPU 31 and changes the number according to the instruction of the management CPU 23. The frequency (channel) of the high-frequency modem 43 may be set.
[0029]
In the four-wave demodulator 37a, high-frequency switches (RF-SW) 51a to 51d are connected to the input sides of the tuners 44a to 44d, and a four-screen combiner 53 is connected to the output sides of the tuners 44a to 44d. . The monitor TV 54 is connected to the four-screen synthesizer 53.
[0030]
The high-frequency switches 51a to 51d receive the monitoring image transmitted by the trunk line 20a via the branching unit 35c and the four distributor 52a, and receive the monitoring image transmitted by the other trunk line 20b into the branching unit 35d. , And are input via a four-way distributor 52b.
[0031]
The high-frequency switches 51a to 51d, the tuners 44a to 44d, and the four-screen synthesizer 53 are controlled in accordance with the operation of the remote controller 38, and a four-screen synthesized image or one selected specific image is displayed on the monitor TV 54.
[0032]
In addition, for example, a red alarm lamp 55 is disposed near the monitor TV 54, and is displayed and driven by the control CPU 31 when a disaster or theft occurs.
[0033]
The monitoring rooms 30b,... May have the same configuration as the monitoring room 30a, but the input system of the disaster prevention / security signal including the S / P converter 33 may be omitted as shown in FIG. The disaster prevention / crime prevention signal for which input to the monitoring room 30b,... Is omitted is input to the S / P converter 33 provided in the monitoring room 30a or the S / P converter 24 connected to the management CPU 23.
[0034]
In the monitoring room 30b, in which the input system of the disaster prevention / security signal including the S / P converter 33 is omitted as described above, the alarm information distributed from the management CPU 23 is received by the control CPU 31, and the designated camera number is designated. Is displayed on the monitor TV 54, and the buzzer 39 and the alarm lamp 55 are driven to notify the observer of the occurrence of a disaster, theft or the like.
[0035]
Next, the overall operation of the video monitoring system shown in FIG. 1 will be described.
First, the frequencies of the modulators 4a, 4b, 4c of the cameras 1a, 1b,... Are set to different channels, respectively, the channel of the high-frequency modem 8 for the dome type camera 1a, and the camera platform control unit 10 for the camera 1b with camera platform. Of the high-frequency modem 11 are set to different values.
[0036]
Further, a camera control management table in which the camera ID numbers (camera numbers) of the cameras 1a, 1b,... . That is, various setting data relating to the cameras 1a, 1b, ... are registered in the management CPU 23. In the alarm table provided in the management CPU 23, serial data (disaster prevention / security signal) output from the S / P converter 24 and a specific camera number are stored in advance in association with each other.
[0037]
In the monitoring rooms 30a, 30b,..., Various settings are made from the touch panel 32 and registered in the control CPU 31. For example, the relationship between the setting channels of the modulators 4a, 4b,... On the cameras 1a, 1b,. Further, the alarm table provided in the control CPU 31 associates serial data (disaster prevention / security signal) output from the S / P converter 33 with a specific camera number in the same manner as the alarm table of the management CPU 23. It is stored in advance.
[0038]
When monitoring images taken by the cameras 1a, 1b,... In the monitoring rooms 30a, 30b,..., The MPU 41 operates under the control of the control CPU 31. The monitor 51a-51d, the tuners 44a-44d, and the four-screen synthesizer 53 are controlled, and the monitor image of the selected channel is synthesized on four screens, or the specified screen is enlarged and displayed on the monitor TV 54.
[0039]
Further, when the number of the camera to be controlled is designated by the remote controller 38, the MPU 41 outputs an operation request to the management CPU 23 via the control CPU 31.
[0040]
When there is an operation request from the monitoring room 30a, for example, the management CPU 23 checks the operation state of the other monitoring rooms 30b,..., And permits the operation request if the operations do not overlap. Is waited for, and after the cancellation, an operation request is permitted to the control CPU 31 in the monitoring room 30a. In this case, the management CPU 23 permits the operation request to the control CPU 31 and specifies the control frequency (channel) of the camera.
[0041]
When the operation request is received by the management CPU 23, the control CPU 31 sends a control command to the MPU 41, sets the transmission channel of the variable high-frequency modem 43 to the channel specified by the management CPU 23, and transmits the camera control command via the trunk line 20a. To the cameras 1a and 1b.
[0042]
In the cameras 1a and 1b, the high-frequency modem 8 or the high-frequency modem 11 corresponding to the set channel of the variable high-frequency modem 43 receives a camera control command from the variable high-frequency modem 43. When the high-frequency modem 8 receives the camera control command, the control command is demodulated to adjust the monitoring direction, focus, and the like of the dome-shaped camera 1a. When the high-frequency modem 11 of the camera platform control unit 10 receives a camera control command, it demodulates the control command and outputs it to the MPU 12. The MPU 12 drives the relay 13 according to the camera control command, rotates the camera platform 3, and adjusts the monitoring direction.
[0043]
In the monitoring room 30a, the S / P converter 33 converts the disaster prevention / security signal sent from the disaster prevention sensor and the security sensor provided in the monitoring area into serial data of a predetermined number of bits and controls the control CPU 31. Output to The disaster prevention / crime prevention signal is a “0” signal in a normal state, and all bits corresponding to each disaster prevention / crime prevention signal in the serial data output from the S / P converter 33 are “0”.
[0044]
When the disaster prevention sensor and the crime prevention sensor detect an abnormality, the sensor output becomes “1”, and the serial data output from the S / P converter 33 changes the corresponding bit of the disaster prevention / security signal indicating the abnormality to “1”. Become.
[0045]
When a disaster prevention / security signal is issued from the disaster prevention sensor or the security sensor, the control CPU 31 outputs alarm information such as a camera number from the alarm table based on the serial data output from the S / P converter 33. .. Are instructed to the MPU 41 of the four-wave demodulators 37a, 37b,..., And a monitoring image is selected according to the camera number and displayed on the monitor TV.
[0046]
Further, the control CPU 31 drives the buzzer 39 to notify the occurrence of the abnormality, and turns on the red alarm lamp 55 to notify the monitoring person of the occurrence of the abnormality. The observer knows the occurrence of the abnormality by the buzzer 39 or the alarm lamp 55, can confirm the details on the monitor screen of the abnormality occurrence area displayed on the monitor TV 54, and can take immediate action.
[0047]
The control CPU 31 transmits the alarm information to the management CPU 23 when receiving the polling service from the management CPU 23. When the alarm information is sent from the monitoring room 30a, the management CPU 23 distributes the alarm information to the control CPUs 31 of all the monitoring rooms 30a, 30b,. Therefore, in the monitoring rooms 30b,... Other than the monitoring room 30a in which the abnormality has occurred, the monitor screen of the area in which the abnormality has occurred is displayed on the monitor TV 54, and the buzzer 39 and the alarm lamp 55 are driven.
[0048]
The management CPU 23 controls not only the monitoring room 30a but also all the monitoring rooms 30a, 30b,... Even when an abnormality is detected by a disaster prevention / security signal input via the S / P converter 24. The alarm information is delivered to the CPU 31.
[0049]
Therefore, the monitoring rooms 30a, 30b,... Can immediately know the occurrence of a disaster or theft by alarm information distributed from the management CPU 23, regardless of which monitoring area has an abnormality, and can deal with it. Can be.
[0050]
As described above, the control CPU 31 is provided in each of the monitoring rooms 30a, 30b,... And the management CPU 23 for managing the entire system, that is, each of the monitoring rooms 30a, 30b,. .. Can be controlled reliably and smoothly by integrating the operations of..., And even if a disaster prevention / security signal is issued in any monitoring area, alarm information can be distributed to all monitoring rooms 30a, 30b. Can be dealt with promptly.
[0051]
In the above embodiment, the case where the disaster prevention / crime prevention signal is input to both the management CPU 23 and the control CPU 31 of the monitoring room 30a has been described, but all the disaster prevention / crime prevention signals are managed via the S / P converter 24. It may be input to the CPU 23. Further, the disaster prevention / crime prevention signal may not be input to the management CPU 23, but may be input to the S / P converter 33 of the monitoring room 30a or the like, for example.
[0052]
【The invention's effect】
As described above in detail, according to the present invention, the operation of all the monitoring rooms can be integrated and controlled reliably and smoothly by providing the management CPU to manage the entire system, and in any monitoring area, disaster prevention / crime prevention Even when a signal is issued, alarm information can be distributed to all monitoring rooms, and it is possible to quickly deal with the occurrence of a disaster, theft, or the like.
[Brief description of the drawings]
FIG. 1 is an overall system configuration diagram showing a video monitoring system according to an embodiment of the present invention.
[Explanation of symbols]
1a: Dome type camera 1b: Camera with camera platform 1c: Fixed dome type camera 2: Ceiling 3: Camera platform 4a, 4b,... Modulators 5a, 5b,... Coaxial cables 6a, 6b,. 7: Camera control unit 8: High-frequency modem for reception (RF modem)
10 pan head controller 11 high-frequency modem for reception (RF modem)
12 ... MPU
13 relays 20a and 20b trunk line 21 bidirectional amplifier 22 branch unit 23 management CPU
24 S / P converters 30a, 30b,... Monitoring room 31 control CPU
32, touch panel 33, S / P converter 34, high-frequency modem 35a, 35b,..., Splitter 36, communication driver / receiver 37a, 37b,..., 4-wave demodulator 38, infrared remote controller (remote controller)
39 buzzer 40 light receiving section 41 MPU
42: communication driver / receiver 43: variable high-frequency modem (variable RF modem)
44a to 44d Tuners 51a to 51d High-frequency switches 52a and 52b Four distributors 53 Four-screen synthesizers 54 Monitor TV
55… Alarm lamp

Claims (4)

In a video surveillance system, a monitoring video signal sent from a plurality of monitoring cameras via a trunk line is received by a plurality of monitoring rooms, demodulated by a demodulator, and displayed on a monitor TV.
A management CPU connected to the trunk line for managing the entire system, and a plurality of disaster prevention sensors provided in each monitoring area and disaster prevention / security signals sent from the security sensors converted to serial data to convert the management CPU An S / P converter for outputting to
A control CPU provided in each of the monitoring rooms and controlling the demodulator under the control of the management CPU;
The management CPU distributes alarm information based on a disaster prevention / crime prevention signal output from the S / P converter to the control CPU in each monitoring room via the trunk line, and causes a specific monitoring image to be displayed on the monitor TV. A video surveillance system characterized by the following. In a video surveillance system, a monitoring video signal sent from a plurality of monitoring cameras via a trunk line is received by a plurality of monitoring rooms, demodulated by a demodulator, and displayed on a monitor TV.
A management CPU connected to the main line and managing the entire system;
A control CPU provided in each of the monitoring rooms and controlling the demodulator under the control of the management CPU; and a plurality of disaster prevention sensors and disaster prevention sensors provided in each of the monitoring areas. An S / P converter for converting a security signal into serial data and outputting the serial data to the control CPU;
The control CPU sends alarm information based on the disaster prevention / security signal output from the S / P converter to the management CPU via the trunk line, and the management CPU sends the alarm information from the control CPU in the monitoring room. A video surveillance system wherein the received alarm information is distributed to the control CPUs of the monitoring rooms via the trunk line, and a specific monitoring image is displayed on the monitor TV. 3. The video surveillance system according to claim 1, wherein each of the monitoring rooms includes an alarm generation unit that generates an alarm sound based on alarm information sent from the management CPU. 4. The video monitoring system according to claim 1, wherein each of the monitoring rooms includes an alarm lamp for performing an alarm display based on alarm information sent from the management CPU.

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