JPH07184190A - Image transmission method in abnormality monitoring equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an image transmission system of an abnormality monitoring equipment capable of transmitting a video signal using a fire alarm line. [Structure] A sensor 1 and an image pickup device 4 are provided on the side of the caution area,
In the image transmission system in the abnormality monitoring equipment for monitoring abnormality such as fire in the central unit 3, the sensor 1 includes a filter 11 that passes only low frequency signals. Imaging device 4
Is composed of a video camera 5 and a video signal processing circuit 19. The video signal processing circuit 19 includes an RF modulation circuit 13 for high frequency modulating the video signal from the video camera 5 and a filter 15 for passing only the high frequency signal. As a result, the detector 1
And the video signal from the video camera 5 are transmitted to the central unit 3 through the same line by using different frequency bands.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality monitoring facility, and more particularly to an image transmission system of an abnormality monitoring facility for transmitting a video signal using a fire alarm line.

[0002]

2. Description of the Related Art In recent years, as an abnormality monitoring facility in a building, there is a fire alarm system for receiving a fire signal from a detector for detecting heat, smoke, etc., which is required by law, and reporting a fire. In addition, a lot of video monitoring equipment has been found to monitor video from a TV camera on the monitor to monitor the situation in the warning area. In this case, conventionally, the fire alarm line from the detector of the fire alarm facility and the image transmission line from the television camera of the video monitoring facility have been separately arranged.

[0003]

However, in such a conventional abnormality monitoring equipment, since the fire alarm line of the fire alarm equipment and the image transmission line of the video surveillance equipment are provided separately, they are the same. Although it is used for abnormality monitoring equipment, there was a problem that two lines had to be constructed separately. Therefore, there is a problem that the number of construction steps as an abnormality monitoring facility is large and the facility is complicated. Although only the fire alarm line was initially installed, if a TV camera is to be used for monitoring afterwards to strengthen the disaster prevention system, a new image transmission line must be constructed and the building is partially In many cases, the work had to be broken and the work had to be done, and there was the problem of causing a great deal of inconvenience to tenants and other residents who had already moved in.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an image transmission system of abnormality monitoring equipment capable of transmitting a video signal using a fire alarm line.

[0005]

In order to solve the above-mentioned problems, in the image transmission system of the present invention according to claim 1, a sensor for detecting heat, smoke, etc. on the side of the warning area, and inside the warning area In an image transmission system in an abnormality monitoring facility that includes an image pickup device that captures a signal, and receives signals from the detector and the image pickup device in a central device to monitor abnormality such as fire, The image pickup apparatus includes a video camera and a video signal processing circuit, and the video signal processing circuit includes an RF modulation circuit for high-frequency modulating a video signal from the video camera, and the RF signal.
It is equipped with a filter that passes only the high frequency signal arranged in the post stage of the modulation circuit, and the output signal from the sensor and the video signal from the video camera are made different by using the same line by changing the frequency band used by those signals. The data is transmitted to the central device.

Further, in the image transmission system of the present invention according to claim 2, the central unit is provided with a sensor for detecting heat, smoke, etc. on the guard area side and an image pickup device for photographing the inside of the guard area. In an image transmission system in an abnormality monitoring facility for receiving signals from the sensor and the image pickup device to monitor abnormality such as fire, the image pickup device includes a video camera and a video signal processing circuit, and the video signal processing circuit. Is for converting the video signal from the video camera into a digital signal A
And a band compression circuit for compressing the digital signal from the A / D conversion circuit into a signal having a predetermined bandwidth,
The output signal from the sensor and the video signal from the video camera are transmitted to the central unit through the same line by superimposing the band-compressed video signal on the signal from the sensor.

[0007]

Embodiments of the image transmission system according to the present invention will now be described with reference to the drawings. 1 and 2 are block diagrams showing the configurations of a sensor and a central unit used in the first embodiment of the present invention. The present embodiment is an abnormality monitoring facility including a sensor 1 arranged in each warning area and a central unit 3 connected to the sensor 1 by a fire alarm line 2.
The video signal from the video camera 5 provided in the warning area is subjected to high frequency modulation, and this is transmitted to the central unit 3 by the fire alarm line together with the output signal of the sensor 1.

In FIG. 1, reference numeral 1 denotes a sensor, which is provided for each warning area. The sensor 1 includes heat, a sensor 18 for detecting heat, an image pickup device 4 including a video camera 5 and a video signal processing circuit 19, a lighting device 6 for illuminating the inside of a caution area, and whether or not the lighting device 6 is turned on. First, an optical sensor 7 for detecting the brightness in the caution area is provided for determining In addition, in the case of the present embodiment, the sensor 1 has a configuration in which, in addition to the sensor 18, the video camera 5 and the lighting device 6 are integrally provided with the sensor main body (not shown). A system in which the illumination 6 and the illumination 6 are provided separately from the sensor body may be used. Further, the present sensor 1 detects the detection signal as the one related to the detection signal by the sensor 18, and detects the detection signal.
A central processing unit (CPU, hereinafter appropriately abbreviated as CPU) that issues a command to each device such as the video camera 5
8 and serial interface 9 for flowing fire data such as heat / smoke data to the fire alarm line 2, rectifier circuit 1
0, a low-pass filter (LPF) 11, and a power supply circuit 12 that supplies power to these.

In addition, the sensor 1 includes a video camera 5 as an image pickup device 4 and a video signal processing circuit 19.
The video signal processing circuit 19 includes an RF modulation circuit 13 that modulates a video signal output at a high frequency, and RF switches 14 and RF that control the connection between the RF modulation circuit 13 and the fire alarm line 2.
The high-pass filter (HPF) 15 is provided in the subsequent stage of the switch 14 and passes only high-frequency signals, and these are also supplied with power from the power supply circuit 12 and the CPU.
Controlled by 8. As a result, the image of the sensor designated by the central device 3 side is subjected to high frequency modulation and transmitted to the fire alarm line 2, and the image of the scene taken by the video camera 5 is transmitted to the central device 3. The high pass filter 15 may be a band pass filter (BPF) that passes only a specific frequency band.

On the other hand, the central unit 3 is provided with a low-pass filter 31, a serial interface 32, and a central processing unit (CPU) 33 for fire data. Further, as a video signal-related one, a high-pass filter 34, a video demodulation circuit 35, an A / D conversion circuit 3
6, which are also controlled by the CPU 33. As a result, the A / D converted video signal becomes C
The image in the caution area is displayed on the display device 41 which is input to the PU 33 and separately connected to the central device 3.

Next, how an image is transmitted in this embodiment will be described. Here, 5 on the first floor of the warning area
Suppose a fire breaks out in room 07. Fifty
When a fire occurs in room 7, the sensor 18 attached to the room first detects heat and smoke caused by the fire. Then, the detection signal is sent to the CPU 8. In this case, the sensor may be either an ON / OFF type or an analog type. The CPU 8 that receives this detection signal sends this fire detection signal (including analog data if it is an analog type sensor, the same applies below) to the fire alarm line 2 via the serial interface 9, the rectifier circuit 10, and the low-pass filter 11. Send out. At this time, the signal sent to the fire alarm line 2 is limited to the low frequency band signal by the action of the low pass filter 11.

On the other hand, the CPU 8 sends a control signal to the video camera 5 at the same time when it detects a fire and operates the video camera 5. At this time, the illumination device 6 is turned on at the same time when the data from the optical sensor 7 is obtained. The video camera 5 photographs the inside of the caution area and outputs a video signal. Then, this video signal is modulated by the RF modulation circuit 13 into a video signal in a high frequency band.

Here, an RF switch 14 which is normally closed is provided at the subsequent stage of the RF modulation circuit 13, and the video signal is not sent to the central unit 3 as it is. That is, the video signal is fired for the first time when the central device 3 that receives the fire detection signal from the CPU 8 issues a command to request the video of room 507, and the RF switch 14 is opened by the CPU 8 that receives this command. Sent to report line 2. A high-pass filter 15 is provided after the RF switch 14, and the sensor 1 is configured so that only a signal in a high frequency band is sent to the fire alarm line 2 as a video signal.
Therefore, since the fire detection signal and the video signal from the sensor are transmitted in different bands, this method allows the fire detection signal and the video signal to be transmitted simultaneously on the same line without causing mutual interference. You can do it. It should be noted that by making the frequency band used by the video signal different for each sensor, the video signals of multiple sensors can be transmitted simultaneously without causing mutual interference. You may choose and extract the image of a desired caution area.

By the way, the central unit 3 which receives the fire detection signal and the video signal operates as follows. First, the fire detection signal is taken into the CPU 33 via the low-pass filter 31 and the serial interface 32. As a result, the central device 3 knows the occurrence of the fire and displays the screen for notifying the fire on the display device 41. FIG. 3A shows a display state on the display device 41 in this case. At this time, when the observer looks at the display device 41 and specifies "video control" on the screen to confirm the site, the screen changes to a plan view as shown in FIG. 3 (b) and the position of No. 507 on the first floor. The relationship is displayed. Then, when the user wants to confirm the internal situation, further specifying "video control" causes the CPU 33 of the central apparatus 3 to issue a command to the CPU 8 of the sensor 1,
At this time, as described above, the RF switch 14 is opened and the video signal is sent to the central unit 3.

The video signal sent to the central unit 3 is separated from the fire detection signal through the high pass filter 34 and demodulated by the video demodulation circuit 35. Here, in this embodiment, the demodulated video signal is digitally converted by the A / D modulation circuit 36, taken into the CPU 33, and the screen as shown in FIG. It As a result, the central device 3 can take appropriate measures while viewing this screen. In the present embodiment, the display device 41 is configured to display an image of only one warning area, but it is also possible to simultaneously transmit the image signals of a plurality of sensors as described above, and in addition, the image signal is ,
It has been converted into digital data by the A / D modulation circuit 36, and it is of course possible to appropriately divide the display screen into a plurality of images of the caution area.

Next, a second embodiment according to the present invention will be described. 4 and 5 show the sensor 1 according to the second embodiment.
3 is a block diagram showing a configuration of a central processing unit 3. FIG.
The same parts as those in the first embodiment are designated by the same reference numerals and the detailed description thereof will be omitted. In this embodiment, the video signal is first band-compressed on the sensor 1 side and sent to the fire alarm line 2. Therefore, in the sensor 1, as the video signal processing circuit 19 of the image pickup device 4, an A / D is used instead of the RF modulation circuit 13 and the like of the previous embodiment.
A conversion circuit 16 and a band compression circuit 17 are provided.
That is, the video signal is sent from the sensor 1 to the A / D conversion circuit 1
6 and the band compression circuit 17 convert it into digital data and send it to the central unit 3 via the fire alarm line 2.

On the other hand, the central unit 3 includes a storage unit 39 and a VRAM in addition to the serial interface 32, the CPU 33.
38, and operates the CPU 33 based on the processing procedure stored in the storage unit 39,
Thus, the band-compressed image data sent is band-expanded, the image data is accumulated in the V-RAM 38, and the image data is displayed on the display device 41.

In the present embodiment having such a configuration, the image of the scene is transmitted as follows. First sensor 1
The point that a fire is detected by 8 and the video camera 5 operates is the same as in the previous embodiment. Then, the video signal from the video camera 5 is taken into the CPU 8 as band-compressed image data as described above. Here, in the present embodiment, it is assumed that image data of each sensor 1 is collected from the central unit 3 by a so-called polling method. Therefore, the central processing 3 knows that there is an alarm when the sensor 1 is called. In this case, the central unit 3 may be configured to know that a fire has occurred by an interruption caused by a notification. Then, the central device 3 which has learned the fire occurrence operates the CPU 33 in accordance with the processing procedure stored in the storage device 39, displays the screen showing the fire occurrence as shown in FIG. Perform priority polling. This priority polling preferentially collects the data on the detectors that have fire alarms. For example, when there are five detectors a, b, c, d, and e, normally a → b → c → d → e → a is called, while c
When there is a notification in, a → b → c → c → c and c
Is a process that is called continuously. In the present embodiment, the period for polling another sensor as a → c → b → c → d → c so as not to block the line with the other sensor during the priority polling. Will be adopted.

The image data from the sensor 1 collected by such priority polling is V-RA after band expansion.
It is stored in M38. Then, when it is required to display the site image on the screen of FIG. 3B, etc., and when sufficient data forming the image is collected, the image as shown in FIG. 3C is displayed on the display device 41.

The present invention can be applied not only to so-called P-type abnormality monitoring equipment that directly receives a signal from a sensor, but also to so-called R-type abnormality monitoring equipment that uses a repeater. Is. Further, in the present embodiment, the sensor provided with the RF modulation circuit and the band compression circuit has been described, but these are provided in the repeater, and the video signal line up to the repeater is separated from the fire alarm line. It may be provided. In the above embodiment, the video camera 5 is operated only when the sensor 18 detects a fire, but the video camera 5 is directly operated by the command from the central device 3 and the display device 41 monitors. It may be done.

[0021]

As described above, according to the present invention of claim 1, the video signal is high-frequency modulated and transmitted, and the detection signal of the sensor is transmitted at a low frequency, and each signal is divided into bands. By adopting the method of transmitting by using the fire alarm line, there is an effect that not only the detection signal but also the video signal can be transmitted to the central device side by the fire alarm line 1. Therefore, it is not necessary to separately provide a line for image transmission, and it is possible to shorten the construction period of the abnormality monitoring equipment and simplify the equipment.

Further, according to the present invention as set forth in claim 2, since the image signal is band-compressed on the sensor side, it is possible to transmit the image data together with the detection signal through the fire alarm line. Similarly, it is possible to shorten the construction period and simplify the equipment.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a sensor in a first embodiment of a transmission system according to the present invention.

FIG. 2 is a block diagram showing a configuration of a central device in the first embodiment of the transmission system according to the present invention.

FIG. 3 is a diagram showing a screen display example in the central device.

FIG. 4 is a block diagram showing a configuration of a sensor in a second embodiment of the transmission system according to the present invention.

FIG. 5 is a block diagram showing a configuration of a central device in a second embodiment of the transmission system according to the present invention.

[Explanation of symbols]

 1 Sensor 2 Fire Alarm Line 3 Central Device 4 Imaging Device 5 Video Camera 6 Lighting Device 8 Central Processing Unit (CPU) 11 Low Pass Filter 13 RF Modulation Circuit 15 High Pass Filter 16 A / D Conversion Circuit 17 Band Compression Circuit 18 Sensor 19 Video Signal processing circuit 31 Low-pass filter 33 Central processing unit (CPU) 34 High-pass filter 35 Video demodulation circuit 36 A / D conversion circuit

Claims (2)

[Claims] 1. A warning area is provided with a sensor for detecting heat, smoke, etc., and an image pickup device for photographing the inside of the warning area, and a central device receives signals from the detector and the image pickup device to cause a fire or the like. In the image transmission system in the abnormality monitoring equipment for monitoring abnormality, the sensor includes a filter that passes only low frequency signals, and the imaging device includes a video camera and a video signal processing circuit. Includes an RF modulation circuit for high-frequency modulating an image signal from the video camera, and a filter for passing only the high-frequency signal arranged in the latter stage of the RF modulation circuit. The output signal from the sensor and the image from the video camera are provided. In an abnormality monitoring facility characterized in that signals are transmitted to the central device through the same line by changing the frequency bands used by those signals. Image transmission method. 2. A warning area is provided with a sensor for detecting heat, smoke, etc., and an image pickup device for photographing the inside of the warning area, and a central device receives signals from the detector and the image pickup device to cause a fire or the like. In the image transmission system in the abnormality monitoring equipment for monitoring abnormality, the image pickup device comprises a video camera and a video signal processing circuit, and the video signal processing circuit converts the video signal from the video camera into a digital signal. An A / D conversion circuit and a band compression circuit for compressing the digital signal from the A / D conversion circuit into a signal having a predetermined bandwidth, and the output signal from the sensor and the video signal from the video camera An image transmission system in an abnormality monitoring facility, characterized in that a compressed video signal is superimposed on a signal from the sensor and transmitted to the central unit through the same line.