WO2006134726A1

WO2006134726A1 - Network type recording system

Info

Publication number: WO2006134726A1
Application number: PCT/JP2006/308548
Authority: WO
Inventors: Shigenori Motooka; Toshihiro Satou
Original assignee: Megachips Corporation
Priority date: 2005-06-13
Filing date: 2006-04-24
Publication date: 2006-12-21
Also published as: JP5055481B2; JP2006352216A

Abstract

There is provided a digital recording system using an existing coaxial cable and capable of freely performing a layout. Cameras (5A, 5B, 5C), a recording device body (1), monitors (6, 8), an operation unit (7), and peripheral devices such as an auxiliary storage device are connected to coaxial cables (3) and the coaxial cables (3) are connected to one another in a tree shape, thereby configuring a network including the recording device body (1) as a host terminal. Each terminal device has a terminal attribute. Each terminal device performs IP communication so as to transmit a corresponding terminal attribute to the recording device body (1). The recording device body (1) supplies power to each of the terminal devices by using the coaxial cables (3). A communication signal having a frequency different from the band of the video is superposed on power supply so as to be transmitted. The recording device body (1) transmits digital data or an analog NTSC signal to the corresponding monitor according to the type of the monitor (6, 8) on the network.

Description

Specification

Network recording system

[0001] The present invention relates to a digital network type recording system utilizing an existing coaxial cable.

Background art

[0002] An analog-based monitoring system includes a camera installed at each shooting location, a recording apparatus body that records output video signals of each camera and synthesizes a split display screen based on the video signals, An operation unit provided in the recording apparatus main body and a monitor for displaying a divided display screen stored in the recording apparatus main body are provided. The recording device main body is connected to the LAN.

[0003] Patent Document 1: JP-A-8-214388

Patent Document 2: JP-A-9 37134

[0004] However, in an analog-based monitoring system, it is necessary to connect each camera and the recording device main unit directly with a coaxial cable. For this reason, cable wiring work is required depending on the number of cameras. It was necessary.

[0005] However, in the monitoring system based on analog, when the monitor is installed in a location different from the recording device main body, the operation unit is included in the recording device main body. There is a problem that it becomes difficult to operate because the person becomes another person. On the contrary, when the monitor is installed near the recording apparatus main body, the recording apparatus main body has a relatively large size, so that it is necessary to secure a larger space.

[0006] When a system is constructed with a network camera using a network cable, in addition to the network cable, an NTSC coaxial cable is added between the recorder and the monitor for video display in addition to the network output. There was a problem that I had to do.

Disclosure of the invention [0007] The present invention has been made in view of such a concern, and an object of the present invention is to provide a digital recording system using an existing coaxial cable that can be freely laid out.

[0008] In the network type recording system according to the subject of the present invention, a camera, a recording device, a monitor, and an operation unit are each connected on a coaxial cable, and each of the coaxial cables is connected in a single shape. Thus, a network having the recording apparatus as a host terminal is configured.

According to the subject of the present invention, it is possible to construct a network in which a recording apparatus main body is a host terminal and a camera, a monitor, and an operation unit are arranged in a tree shape using an existing coaxial cable. It is possible to lay out each device freely. For this reason, it is not necessary to carry out cable wiring work according to the number of power cameras, and it is possible to operate while monitoring the monitor, so that the operational difficulty is improved and system construction is improved. There is an advantage that a large space is not required.

[0010] The objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Brief Description of Drawings

FIG. 1 is a block diagram schematically showing a configuration of a network recording system according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating a combined divided display screen.

FIG. 3 is a block diagram schematically showing a configuration of a network recording system according to Embodiment 2 of the present invention.

FIG. 4 is a block diagram schematically showing a configuration of a recording system according to a modified example of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

[0012] (Embodiment 1)

FIG. 1 is a block diagram schematically showing the configuration of the network recording system according to the present embodiment.

In FIG. 1, a recording apparatus main body 1 is connected to an Ethernet (registered trademark) with a personal computer 11 connected to one end, and a video data or audio data signal. HDD2 is stored. The video recording system in FIG. 1 constructs a monitoring system network by connecting the coaxial cable 3 in a tree shape via the distributors 4 and 4A with the recording apparatus body 1 as a host terminal. . That is, the recording apparatus main body 1 is connected to the other end of the coaxial cable 3 connected at one end to the distributor 4, the distributor 4A is connected to the distributor 4 via the coaxial cable 3, and the one end is connected to the distributor. 4 and 4A are connected to the other end of the coaxial cable 3 with cameras 5A, 5B, 5C, a monitor 6, an operation unit (for example, comprising a keyboard) 7 of the recording apparatus body 1 and a filter 9 interposed. 8 terminal devices are connected. In addition, a peripheral device such as an auxiliary storage device (compact flash or the like) may be connected to the other end of the coaxial cable 3 connected to the distributor 4 as a component of the network. In this way, each device 1, 5A, 5B, 5C, 6, 7, 8 including peripheral devices is connected to the coaxial cable 3 to form a network, and communication between each terminal device is possible. (For example, communication between the cameras 5A and 5B).

[0014] The frequency band of the communication signal used in this network is a band different from the frequency band of the video signal, and each terminal device 5A, 5B, 5C, 6, 7, 8 is a recording device main body. Communicates with 1 using the IP protocol. That is, each terminal device 5A, 5B, 5C, 6, 7, and 8 has a corresponding terminal attribute, and transmits the terminal attribute to the recording apparatus main body 1 when the power is turned on. Through the communication of the terminal attribute, the recording apparatus main body 1 is connected to the system by the power that each terminal is (for example, information on what type a camera is) and how many cameras are connected to the system. Information on terminal devices connected to the system, such as the power connected to the digital motor, or whether the analog monitor is also connected via a filter. In addition, since at least one monitor is usually connected to a system such as the present invention, if there is no monitor (digital) in response to a terminal attribute, the recording device body 1 is Judge that the analog monitor is connected to the coaxial cable 3 through a filter. In this way, the recording device main unit 1 dynamically detects terminal information connected to the coaxial cable 3 and controls each terminal device so that it can be changed according to the type and number of detected terminal devices. To do.

[0015] Moreover, in this system, each terminal device 5A, 5B, 5C, 6, 7 (if the peripheral device is connected, the peripheral device is connected from the recording device main body 1 using the coaxial cable 3. Including In other words, the power supply voltage (power) is supplied, and the communication signal is transmitted on the coaxial cable 3 while being superimposed on the power supply voltage. Note that some terminals, like the monitor 8 in FIG. 1 (the filter 9 cuts off the power supply from the recording apparatus main body 1), do not use the power supply from the recording apparatus main body 1 and directly use the power line cable. In addition, a device that receives power supply may be connected.

Next, the operation of this network type recording system will be described.

First, when the power is turned on, each terminal device obtains an individual IP address from the recording device main body 1 and requests the recording device main body 1 for operation permission. When the operation permission is received, each terminal device transmits the terminal attribute information described above to the recording device body 1.

[0018] Then, each camera 5A, 5B, 5C transmits, to the recording apparatus main body 1, a compressed video signal of the designation (resolution, number of frames, image quality) obtained by photographing based on an instruction from the recording apparatus main body 1. The

[0019] The recording device body 1 receives the compression-coded digital video signal transmitted from each camera 5A, 5B, 5C, stores and saves the received video data in the HDD 2, and displays the display video. To synthesize a split display screen as shown in Fig. 2. For example, in FIG. 2, the monitor screen 6G is divided into four, and each of the divided screen areas 6R1, 6R2, 6R3, and 6R4 has a first camera, a second camera, a third camera, and a second camera in the network. Allocate and display images taken by each of the 4 cameras.

[0020] Here, assuming that the monitor 6 in FIG. 1 is a digital motor capable of digital display, after combining the divided display screen, the recording apparatus main body 1 displays the combined divided display screen (digital data signal). Is transmitted to the digital monitor 6, and the divided display screen is displayed on the digital monitor 6.

[0021] On the other hand, there is no monitor capable of digital display on this network (assuming that there is no digital motor 6 in FIG. 1). For example, only the analog monitor 8 in FIG. It shall be connected. At this time, since only an analog monitor exists on this network, the recording apparatus body 1 passes through a down-scan converter (not shown) in order to output the synthesized divided display screen to the analog monitor 8. (Change the resolution from VGA signal to NTSC signal, for example), send the analog NTSC signal on the split display screen to coaxial cable 3 and output to analog monitor 8. At that time, Since the frequency band of the signal is different from that of the communication signal as described above, the filter 9 cuts the superimposed power supply voltage, and the analog NTSC signal split display screen is displayed on the analog motor 8.

In this way, the recording apparatus body 1 transmits digital data or an analog NTSC signal to the monitor according to the type of monitor on the network.

As described above, according to the present embodiment, a network in which IP communication is possible between terminals and the recording apparatus main body 1 as a host terminal is constructed using an existing coaxial cable (in a tree shape). Therefore, each device can be laid out freely, and all the problems described above can be overcome.

(Embodiment 2)

FIG. 3 is a block diagram schematically showing the configuration of the network recording system according to the present embodiment. In FIG. 3, the same reference numerals as those in FIG. 1 denote the same components.

[0025] Also in the network type recording system according to the present embodiment, a recording device, a camera, a monitor, an operation unit, and a peripheral device can be obtained by connecting the coaxial cable in a tree shape with the recording device main body 1 as a host terminal. A network is built in which equipment is connected to one end of each coaxial cable.

In particular, in FIG. 3, the analog monitor 12 having the filter 13 and the monitor screen force-divided digital motor 14 are connected to one end of the coaxial cable 3 corresponding to each force. Digital CC (closed circuit) that can output digital compressed data and analog NTSC signal from the same terminal (connector) at the same time TVZ Analog CCT V combined camera 5D and digital CCTV that can output only digital compressed data A power of 5E is connected to one end of the coaxial cable 3 connected to the distributor 4A. Here, the camera 5D adopts the OFDM modulation method in the transmission method using the coaxial cable, and according to this OFDM modulation method, the transmission frequency band of digital data is, for example, lGHz to l.5GHz. The frequency is clearly higher than 27 MHz, which is the analog NTSC frequency band. Therefore, the camera 5D can superimpose the digital compressed data and the analog NTSC signal on the same coaxial cable 3 line. In this case, the digital compressed data sent from the camera 5D camera and analog N The recording device body 1 that has received the TSC signal separates both data signals using a frequency filter or the like (not shown) and stores them in the HDD 2.

[0027] The recording apparatus body 1 transmits the separated analog NTSC signal to the analog monitor 12 through the coaxial cable 3 and the filter 13, and the analog video captured by the camera 5D is displayed on the analog monitor 12. The

On the other hand, the recording apparatus main body 1 also receives the digital compressed data transmitted from the camera 5E, and stores the data in the HDD 2. Then, the recording device body 1 decompresses the digital compressed data obtained from the camera 5D and the digital compressed data obtained from the camera 5E, synthesizes the divided display screen, and divides the digital video signal obtained by the synthesis. Then, the signal is transmitted to the digital motor 14 via the coaxial cable 3. As a result, the image captured by the camera 5D is displayed in the first area R1 of the monitor screen of the digital motor 14, while the image captured by the camera 5E is displayed on the second screen of the monitor screen of the digital motor 14. Displayed in area R2

[0029] As described above, in the present embodiment, each camera in the network recording system uses only digital compressed data or digital compressed data depending on the type of monitor connected on the network. And analog NTSC signals are sent to the recorder 1 at the same time. Therefore, it is possible to lay out each device freely in the network including the digital CCTVZ analog CCTV camera 5D and the digital CCTV camera 5E.

[0030] (Modification)

As shown in Fig. 4, the camera 5F that can output an analog NTSC signal is installed at the shooting location, and when the camera 5F is turned on, the camera 5F is an analog monitor placed at another location. In addition, an analog NTSC signal image may be transmitted via the coaxial cable 3 and the filter 15.

[0031] The power of disclosing and describing the embodiment of the present invention in detail [0031] The above description illustrates the applicable aspect of the present invention, and the present invention is not limited to this. That is, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention. Industrial applicability

The present invention can be applied to a monitoring system in a security company, for example.

Claims

The scope of the claims

[1] A camera, a recording apparatus main body, a monitor, and an operation unit are connected on a coaxial cable, and each of the coaxial cables is connected in a tree shape to form a network using the recording apparatus main body as a host terminal. It is characterized by

Network recording system.

[2] The network type recording system according to claim 1,

Each terminal device of the camera, the monitor, and the operation unit has a terminal attribute, and each terminal device transmits the corresponding terminal attribute to the recording apparatus main body by performing communication using an IP protocol. And

Network recording system.

[3] The network type recording system according to claim 2,

The recording apparatus main body dynamically detects connected terminal information, and the control can be changed according to the number and type of detected terminal devices.

Network recording system.

[4] The network type recording system according to claim 3,

The recording apparatus main body supplies power to each terminal device using each of the coaxial cables in the form of a tree, and a communication signal having a frequency in a band different from the video is superimposed on the power supply and transmitted. It is characterized by

Network recording system.

[5] The network type recording system according to claim 4,

The network recording system, wherein the recording apparatus main body transmits digital data or an analog NTSC signal to the monitor according to a type of the monitor on the network.

[6] The network type recording system according to claim 4,

The camera transmits only the digitally compressed data or the digitally compressed data and the analog NTSC signal simultaneously to the recording apparatus body according to the type of the monitor connected on the network. To

Network recording system.