JP5055481B2 - Network recording system - Google Patents

Description

  The present invention relates to a digital network type recording system using an existing coaxial cable.

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

JP-A-8-214388 JP-A-9-37134

  However, in an analog-based monitoring system, it is necessary to directly connect each camera and the recording apparatus main body with a coaxial cable. For this reason, cable wiring work is required according to the number of cameras.

  In addition, 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, so that the operator and the monitor supervisor are different persons. As a result, there is a problem that operation becomes difficult. 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.

  In addition, when a system is constructed with a network camera using a network cable, an NTSC coaxial cable must be added between the recorder and the monitor for video display in addition to the network cable in order to obtain monitor output. There was a problem of not becoming.

  The present invention has been made in view of such a matter of concern, and an object thereof is to provide a digital recording system utilizing an existing coaxial cable that can be freely laid out.

Network type recording system according to the subject matter of the present invention, a camera, a recording apparatus main body, operation unit, a digital monitoring and / or each of the analog monitor connected to the coaxial cable, and, respectively in a tree-like of the coaxial cable Connected to form a network having the recording apparatus main body as a host terminal, each terminal device of the camera, the digital monitor, and the operation unit has a terminal attribute, and each terminal device performs communication according to an IP protocol. said terminal attribute corresponding transmitted to the recording apparatus main body by the recording apparatus main body, at least the digital monitor as monitor if it contains the said terminal attribute of the digital monitor to the terminal attributes received determines that provided, the digital monitoring the terminal attribute of the terminal attributes received If not included, characterized in that it is determined that the analog monitor is provided as the monitor.

  Hereinafter, various embodiments of the subject of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

  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 by utilizing an existing coaxial cable. Each device can be laid out freely. This eliminates the need for cable wiring according to the number of cameras. In addition, since it is possible to operate the monitor while monitoring it, the operational difficulty is improved, and a large system construction is required. The advantage of not requiring space is obtained.

(Embodiment 1)
FIG. 1 is a block diagram schematically showing a configuration of a network type 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 has an HDD 2 for storing video data and audio data signals. 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 main body 1 as a host terminal. That is, the recording apparatus main body 1 is connected at one end to the other end of the coaxial cable 3 connected to the distributor 4, the distributor 4A is connected to the distributor 4 via the coaxial cable 3, and one end is connected to the distributor. 4 and 4A are connected to the other end of each coaxial cable 3 with cameras 5A, 5B and 5C, a monitor 6, an operation unit (for example, comprising a keyboard) 7 of the recording apparatus body 1 and a monitor 8 with a filter 9 interposed therebetween. Each terminal device is 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, the devices 1, 5A, 5B, 5C, 6, 7, and 8 including peripheral devices are connected to the coaxial cable 3 to form a network, and communication is possible between the terminal devices (for example, , Communication between the cameras 5A and 5B).

  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 connected to the recording apparatus main body 1. Communication using the IP protocol is performed. That is, each of the terminal devices 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 determines what each terminal is (for example, what type of camera a certain type is), how many cameras are connected to the system, Information on terminal devices connected to the system such as whether a digital monitor is connected or an analog monitor is also connected via a filter is acquired. In addition, since at least one or more monitors are usually connected to a system such as the present invention, if there is no monitor (digital) in response to a terminal attribute, the recording apparatus main body 1 has an analog monitor. It is determined that the configuration is connected to the coaxial cable 3 via a filter. As described above, the recording apparatus main body 1 dynamically detects the terminal information connected to the coaxial cable 3 and controls each terminal device so that the control can be changed according to the type and number of the detected terminal devices.

  Moreover, in the present system, each terminal device 5A, 5B, 5C, 6, 7 (including the peripheral device when the peripheral device is connected) from the recording apparatus main body 1 using the coaxial cable 3 is used. ) Is supplied with a power supply voltage (power), and a communication signal is transmitted on the coaxial cable 3 while being superimposed on the power supply voltage. Note that some terminals, such as 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, but directly from the power line. You may connect what receives power supply.

  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 apparatus main body 1 and requests the recording apparatus main body 1 for operation permission. When receiving the operation permission, each terminal device transmits the terminal attribute information described above to the recording apparatus main body 1.

  Each of the cameras 5A, 5B, and 5C transmits a compressed video signal of designation (resolution, number of frames, image quality) obtained by photographing to the recording apparatus main body 1 based on an instruction from the recording apparatus main body 1.

  The recording apparatus body 1 receives the compression-encoded digital video signals transmitted from the cameras 5A, 5B, and 5C, stores and stores the received video data in the HDD 2, and expands the display video. A split display screen as illustrated in FIG. 2 is synthesized. 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. The video shot by each of the four cameras is allocated and displayed.

  Here, assuming that the monitor 6 of FIG. 1 is a digital monitor 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) on the digital monitor 6. The divided display screen is displayed on the digital monitor 6.

  On the other hand, there is no monitor capable of digital display on the network (assuming that the digital monitor 6 in FIG. 1 does not exist), for example, only the analog monitor 8 in FIG. 1 is connected to the system. And At this time, since there is only an analog monitor on the network, the recording apparatus main body 1 passes through a down-scan converter (not shown) in order to output the combined divided display screen to the analog monitor 8 ( The resolution is changed from, for example, a VGA signal to an NTSC signal), and the analog NTSC signal of the divided display screen is transmitted to the coaxial cable 3 and output to the analog monitor 8. At this time, since the frequency band of the video signal is different from that of the communication signal as described above, the filter 9 cuts off the superimposed power supply voltage and the divided display screen of the analog NTSC signal is displayed on the analog monitor 8.

  As described above, the recording apparatus main body 1 transmits digital data or an analog NTSC signal to the monitor according to the type of the monitor on the network.

  As described above, according to the present embodiment, since a network capable of IP communication between terminals and using the recording apparatus main body 1 as a host terminal is constructed using existing coaxial cables (in the form of a tree) Equipment 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. 3, the same reference numerals as those in FIG. 1 denote the same components.

  Also in the network type recording system according to the present embodiment, by connecting coaxial cables in a tree shape with the recording apparatus body 1 as a host terminal, the recording apparatus, camera, monitor, operation unit, and peripheral devices are connected to each coaxial cable. A network connected to one end of the network is constructed.

  In particular, in FIG. 3, an analog monitor 12 having a filter 13 and a digital monitor 14 having a monitor screen divided into two are connected to one end of the corresponding coaxial cable 3 and digital compressed data. A digital CC (closed circuit) TV / analog CCTV combined camera 5D capable of simultaneously outputting analog NTSC signals and analog NTSC signals from the same terminal (connector), and a digital CCTV camera 5E capable of outputting only digital compressed data, Each is connected to one end of the coaxial cable 3 connected to the distributor 4A. Here, the camera 5D employs the OFDM modulation method in the transmission method using a coaxial cable. According to this OFDM modulation method, the transmission frequency band of digital data is, for example, 1 GHz to 1.5 GHz. The frequency is clearly higher than 27 MHz, which is the frequency band of the analog NTSC system. 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 recording apparatus main body 1 that has received the digital compressed data and the analog NTSC signal transmitted from the camera 5D separates both data signals using a frequency filter or the like (not shown) and stores them in the HDD 2. To do.

  The recording apparatus body 1 transmits the separated analog NTSC signal to the analog monitor 12 via the coaxial cable 3 and the filter 13, and the analog video captured by the camera 5 </ b> D is displayed on the analog monitor 12.

  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 apparatus main body 1 decompresses the digital compressed data obtained from the camera 5D and the digital compressed data obtained from the camera 5E to synthesize a two-part divided display screen, and the digital video signal obtained by the synthesis is The data is transmitted to the digital monitor 14 via the coaxial cable 3. As a result, the video imaged by the camera 5D is displayed in the first area R1 of the monitor screen of the digital monitor 14, while the video imaged by the camera 5E is displayed in the second area R2 of the monitor screen of the digital monitor 14. Is done.

  As described above, in this embodiment, each camera in the network type recording system receives only digital compressed data or digital compressed data and an analog NTSC signal depending on the type of monitor connected on the network. At the same time, the data is transmitted to the recording apparatus main body 1. Accordingly, it is possible to freely lay out each device in the network including the digital CCTV / analog CCTV combined camera 5D and the digital CCTV camera 5E.

(Modification)
As illustrated in FIG. 4, a camera 5F capable of outputting an analog NTSC signal is installed at a shooting location, and when the camera 5F is turned on, the camera 5F is connected to an analog monitor 16 disposed at another location. An image of an analog NTSC signal may be transmitted via the coaxial cable 3 and the filter 15.

(Appendix)
While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. In other words, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention.

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

It is a block diagram which shows typically the structure of the network type video recording system which concerns on Embodiment 1 of this invention. It is a figure which illustrates the division | segmentation display screen combined. It is a block diagram which shows typically the structure of the network type video recording system which concerns on Embodiment 2 of this invention. It is a block diagram which shows typically the structure of the video recording system which concerns on the modification of this invention.

Explanation of symbols

1 recording device main body, 2 HDD, 3 coaxial cable, 4 distributor, 5A, 5B, 5C, 5D, 5E, 5F camera, 6, 8, 12, 14, 16 monitor, 7 operation unit.

Claims (5)

Camera, recording apparatus main body, operation unit, connected digital monitor and / or the respective analog monitor on a coaxial cable, and said a recording apparatus main body host terminal to connect each of the coaxial cable to the tree Configure the network,
Each terminal device of the camera, the digital 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 according to an IP protocol,
The recording apparatus main body is
Determining that if the terminal attributes received contains the terminal attribute of the digital monitor is at least the digital monitor is provided as a monitor,
When the received terminal attribute does not include the terminal attribute of the digital monitor, it is determined that the analog monitor is provided as the monitor,
Network recording system. The network type recording system according to claim 1,
The recording device 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. The network type recording system according to claim 1 or 2,
The recording apparatus body supplies power to at least one terminal device among the camera, the monitor, and the operation unit using each of the coaxial cables in a tree shape, and has a frequency in a band different from that of the video signal. The communication signal having the above is transmitted superimposed on the power source,
Network recording system. The network type recording system according to any one of claims 1 to 3,
The recording apparatus main body transmits digital data or an analog NTSC signal to the monitor according to the type of the monitor on the network.
Network recording system. The network type recording system according to any one of claims 1 to 3,
According to the type of the monitor connected to the network, the camera transmits only the digital compressed data or the digital compressed data and the analog NTSC signal to the recording apparatus body at the same time.
Network recording system.

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