JP2006352216A - Network type video recording system - Google Patents

Network type video recording system Download PDF

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JP2006352216A
JP2006352216A JP2005172070A JP2005172070A JP2006352216A JP 2006352216 A JP2006352216 A JP 2006352216A JP 2005172070 A JP2005172070 A JP 2005172070A JP 2005172070 A JP2005172070 A JP 2005172070A JP 2006352216 A JP2006352216 A JP 2006352216A
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network
monitor
recording system
main body
recording apparatus
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JP5055481B2 (en
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Shigeaki Motooka
茂哲 本岡
Toshihiro Sato
稔浩 佐藤
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MegaChips System Solutions Inc
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MegaChips System Solutions Inc
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Priority to PCT/JP2006/308548 priority patent/WO2006134726A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/27—Server based end-user applications
    • H04N21/274—Storing end-user multimedia data in response to end-user request, e.g. network recorder
    • H04N21/2747—Remote storage of video programs received via the downstream path, e.g. from the server

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitor system of CCTV, or the like, in which each apparatus is laid out freely. <P>SOLUTION: Peripheral devices such as cameras 5A, 5B, 5C, a recorder body 1, monitors 6, 8, an operating section 7, and an auxiliary memory are connected on coaxial cables 3 and the coaxial cables 3 are connected in tree thus constituting a network where the recorder body 1 serves as a host terminal. Each terminal has terminal attributes and transmits corresponding terminal attribute to the recorder body 1 by performing IP communication. The recorder body 1 supplies power to each terminal by utilizing each coaxial cable 3, and a communication signal having the frequency of a band different from that of a video image is transmitted while superposed on the power supply. Depending on the type of the monitors 6, 8 on the network, the recorder body 1 transmits digital data or an analog NTSC signal to a corresponding monitor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、既設の同軸ケーブルを活用したデジタル方式のネットワーク型録画システムに関する。   The present invention relates to a digital network type recording system using an existing coaxial cable.

アナログをベースとする監視システムは、各撮影場所に設置されたカメラと、各カメラの出力映像信号を記録して各映像信号に基づき分割表示画面を合成する記録装置本体と、当該記録装置本体に設けられた操作部と、当該記録装置本体に格納された分割表示画面を表示するモニターとを、備えている。そして、記録装置本体は、ＬＡＮに接続されている。   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.

特開平８−２１４３８８号公報JP-A-8-214388 特開平９−３７１３４号公報JP-A-9-37134

しかしながら、アナログをベースとする監視システムでは、各カメラと記録装置本体とを直接に同軸ケーブルで接続する必要があり、このため、カメラ台数に応じてケーブルの配線工事が必要であった。   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.

しかも、アナログをベースとする監視システムでは、記録装置本体とは別の場所にモニターを設置した場合には、操作部が記録装置本体に含まれているため、操作者とモニター監視者とが別人となってしまい、操作が困難になってしまうと言う問題点があった。逆に、記録装置本体の近くにモニターを設置する場合には、記録装置本体が比較的大きなサイズを有しているため、より一層大きなスペースを確保する必要性が生じる。   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.

又、ネットワークケーブルを利用し、ネットワークカメラでシステムを構築した場合には、モニター出力となるために、ネットワークケーブル以外に、映像表示用にＮＴＳＣ同軸ケーブルを記録装置本体とモニター間に増設しなければならないと言う問題点があった。   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.

この発明は斯かる懸案事項に鑑み成されたものであり、自由なレイアウトが可能な、既設の同軸ケーブルを活用したデジタル方式の録画システムを提供することを、その目的としている。   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.

本発明の主題に係るネットワーク型録画システムは、カメラ、記録装置、モニター及び操作部の各々を同軸ケーブル上に接続し、且つ、前記同軸ケーブルの各々をツリー状に接続して前記記録装置をホスト端末とするネットワークを構成したことを特徴とする。   A network type recording system according to the present invention includes a camera, a recording device, a monitor, and an operation unit connected on a coaxial cable, and each of the coaxial cables connected in a tree shape to host the recording device. It is characterized by configuring a network as a terminal.

以下、この発明の主題の様々な具体化を、添付図面を基に、その効果・利点と共に、詳述する。   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.

本発明の主題によれば、既設の同軸ケーブルを活用して、記録装置本体をホスト端末とし、且つ、カメラ、モニター及び操作部がツリー状に配設されたネットワークを構築することが出来るので、各機器を自由にレイアウトする事が出来る。このため、カメラ台数に応じてケーブルの配線工事が必要となることは無く、又、モニターを監視しつつ操作することが可能となるので操作上の困難性も改善される上、システム構築に際して大きなスペースを必要とはしないと言う利点が得られる。   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.

（実施の形態１）
図１は、本実施の形態に係るネットワーク型録画システムの構成を模式的に示すブロック図である。 (Embodiment 1)
FIG. 1 is a block diagram schematically showing a configuration of a network type recording system according to the present embodiment.

図１において、記録装置本体１は、一端にパーソナルコンピュータ１１が接続されたイーサネット（登録商標）に接続されていると共に、映像データや音声データの信号を記憶するＨＤＤ２を有する。そして、図１の本録画システムは、記録装置本体１をホスト端末として、分配器４，４Ａを介して、同軸ケーブル３をツリー状に接続することで、監視システムのネットワークを構築している。即ち、記録装置本体１は、一端が分配器４に接続された同軸ケーブル３の他端に接続されており、分配器４Ａは同軸ケーブル３を介して分配器４に接続され、一端が分配器４，４Ａに接続された各同軸ケーブル３の他端には、カメラ５Ａ，５Ｂ，５Ｃ、モニター６、記録装置本体１の操作部（例えばキーボードより成る）７及びフィルタ９を介在させたモニター８の各端末機器が接続されている。その他に、例えば補助記憶装置（コンパクトフラシュ等）等の周辺機器を、分配器４に接続された同軸ケーブル３の他端に接続させて、当該ネットワークの構成要素としても良い。この様に、周辺機器を含む各機器１，５Ａ，５Ｂ，５Ｃ，６，７，８が同軸ケーブル３に接続されてネットワークを構成しており、各端末機器間で通信が可能である（例えば、カメラ５Ａ，５Ｂ間の通信）。   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).

本ネットワークで用いられる通信信号の周波数帯域には、映像信号の周波数帯域とは異なる帯域が利用されており、各端末機器５Ａ，５Ｂ，５Ｃ，６，７，８は、記録装置本体１との間で、ＩＰプロトコルによる通信を行う。即ち、各端末機器５Ａ，５Ｂ，５Ｃ，６，７，８は、対応する端末属性を有しており、電源投入時に、当該端末属性を記録装置本体１に送信する。この端末属性の通信により、記録装置本体１は、各端末が如何なる物であるか（例えば、或るカメラは如何なるタイプのものかと言う情報）、何台のカメラが本システムに繋がっているのか、デジタルモニターが繋がっているか、あるいは、アナログモニターもフィルタを介して繋がっているか等の、本システム上に繋がっている端末機器に関する情報を取得する。又、本発明の様なシステムには、通常少なくとも１台以上のモニターが接続されていることから、端末属性の応答でモニター（デジタル）が無い場合には、記録装置本体１は、アナログモニターがフィルタを介して同軸ケーブル３に接続されている構成であると、判断する。この様に、記録装置本体１は、同軸ケーブル３に接続されている端末情報をダイナミックに検出し、検出された端末機器の種類、台数に応じて、各端末機器を制御変更可能に制御する。   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.

しかも、本システムでは、記録装置本体１から、同軸ケーブル３を利用して、各端末機器５Ａ，５Ｂ，５Ｃ，６，７（周辺機器が接続されている場合には当該周辺機器をも含めて）に、電源電圧（電力）が供給されており、通信信号は、同軸ケーブル３上を、上記電源電圧に重畳して送信される。尚、端末の中には、図１のモニター８の様に（フィルタ９は記録装置本体１からの電源を遮断する）、記録装置本体１からの電源を利用せずに、直接に電源ラインから電源供給を受けるものを接続しても良い。   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.

次に、本ネットワーク型録画システムの動作に関して記述する。   Next, the operation of this network type recording system will be described.

先ず、電源投入時、各端末機器は、記録装置本体１から、個々のＩＰアドレスを取得すると共に、動作許可を記録装置本体１に要求する。動作許可を受けると、各端末機器は既述した端末属性の情報を記録装置本体１に送信する。   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.

そして、各カメラ５Ａ，５Ｂ，５Ｃは、記録装置本体１からの指示に基づき、撮影により得られた指定（解像度、コマ数、画質）の圧縮映像信号を、記録装置本体１に送信する。   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.

記録装置本体１は、各カメラ５Ａ，５Ｂ，５Ｃから送信されて来る圧縮符号化されたデジタル映像信号を受信して、受信映像データをＨＤＤ２に格納・保存すると共に、表示映像を伸張して、図２に例示する様な分割表示画面を合成する。例えば図２に於いては、モニター画面６Ｇは４分割されており、その分割画面領域６Ｒ１，６Ｒ２，６Ｒ３，６Ｒ４のそれぞれに、本ネットワーク内の第１カメラ、第２カメラ、第３カメラ及び第４カメラの各々によって撮影された映像を割り振り、表示する。   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.

ここで、図１のモニター６がデジタル表示可能なデジタルモニターであるものとすると、分割表示画面の合成後、記録装置本体１は、合成された分割表示画面（デジタルデータ信号）を、デジタルモニター６に送信し、当該分割表示画面がデジタルモニター６に映し出される。   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.

それに対して、本ネットワーク上にデジタル表示可能なモニターが存在せず（図１のデジタルモニター６が存在しないと想定する）、例えば図１のアナログモニター８のみが本システム上に接続されているものとする。このとき、本ネットワーク上にはアナログモニターしか存在しないため、記録装置本体１は、合成された分割表示画面をアナログモニター８に出力するために、ダウンスキャンコンバータ（図示せず）を経由して（解像度を例えばＶＧＡ信号からＮＴＳＣ信号に変える）、分割表示画面のアナログＮＴＳＣ信号を同軸ケーブル３に送信し、アナログモニター８に出力する。その際、映像信号の周波数帯域は既述した通り通信信号のそれとは異なるため、フィルタ９は、重畳されている電源電圧をカットし、アナログＮＴＳＣ信号の分割表示画面がアナログモニター８に映し出される。   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.

この様に、記録装置本体１は、ネットワーク上のモニターの種類に応じて、デジタルデータ又はアナログＮＴＳＣ信号を当該モニターに送信する。   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.

以上の通り、本実施の形態によれば、端末間でＩＰ通信が可能な、記録装置本体１をホスト端末とするネットワークが既設の同軸ケーブル（ツリー状）を用いて構築されているので、各機器を自由にレイアウト配置することが出来、既述した問題点は全て克服され得る。   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.

（実施の形態２）
図３は、本実施の形態に係るネットワーク型録画システムの構成を模式的に示すブロック図である。図３に於いて、図１と同一の参照符号は同一の構成要素を示す。 (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.

本実施の形態に係るネットワーク型録画システムに於いても、記録装置本体１をホスト端末として同軸ケーブルをツリー状に接続することで、記録装置、カメラ、モニター、操作部及び周辺機器が各同軸ケーブルの一端に接続されたネットワークが、構築されている。   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.

特に図３に於いては、フィルタ１３を具備するアナログモニター１２と、モニター画面が２分割されたデジタルモニター１４とが、それぞれに対応する同軸ケーブル３の一端に接続されていると共に、デジタル圧縮データとアナログＮＴＳＣ信号とを同一の端子（コネクタ）から同時に出力可能なデジタルＣＣ（closed circuit）ＴＶ／アナログＣＣＴＶ兼用のカメラ５Ｄと、デジタル圧縮データのみを出力可能なデジタルＣＣＴＶ用のカメラ５Ｅとが、各々、分配器４Ａに接続された同軸ケーブル３の一端に接続されている。ここで、カメラ５Ｄでは、同軸ケーブルを用いた伝送方式に於けるＯＦＤＭ変調方式を採用しており、このＯＦＤＭ変調方式によれば、デジタルデータの伝送周波数帯域は例えば１ＧＨｚ〜１．５ＧＨｚであって、アナログＮＴＳＣ方式の周波数帯域である２７ＭＨｚと比較しても明らかに高い周波数である。このため、カメラ５Ｄは、デジタル圧縮データとアナログＮＴＳＣ信号とを同一の同軸ケーブル３のライン上に重畳させることが出来る。この場合、カメラ５Ｄから送信されて来たデジタル圧縮データとアナログＮＴＳＣ信号とを受信した記録装置本体１は、周波数フィルタ等（図示せず）を用いて、両データ信号を分離し、ＨＤＤ２に保存する。   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.

記録装置本体１は、分離されたアナログＮＴＳＣ信号を、同軸ケーブル３及びフィルタ１３を介して、アナログモニター１２に送信し、カメラ５Ｄが撮影したアナログ映像がアナログモニター１２に表示される。   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.

他方、記録装置本体１は、カメラ５Ｅが送信して来るデジタル圧縮データをも受信して、当該データをＨＤＤ２に保存する。そして、記録装置本体１は、カメラ５Ｄより得たデジタル圧縮データとカメラ５Ｅより得たデジタル圧縮データとを伸張して２分割の分割表示画面を合成し、合成により得られたデジタル映像信号を、同軸ケーブル３を介して、デジタルモニター１４に送信する。その結果、カメラ５Ｄが撮影した映像は、デジタルモニター１４のモニター画面の第１領域Ｒ１に表示され、他方、カメラ５Ｅによって撮影された映像は、デジタルモニター１４のモニター画面の第２領域Ｒ２に表示される。   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.

以上の通り、本実施の形態は、ネットワーク型録画システム内の各カメラは、ネットワーク上に接続されているモニターの種類に応じて、デジタル圧縮データのみを、又は、デジタル圧縮データ及びアナログＮＴＳＣ信号を同時に、記録装置本体１に送信することを特徴としている。従って、デジタルＣＣＴＶ／アナログＣＣＴＶ兼用のカメラ５ＤとデジタルＣＣＴＶ用のカメラ５Ｅとを含めて、各機器をネットワーク内に於いて自由にレイアウトすることが可能となる。   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.

（変形例）
図４に例示する様に、撮影地に、アナログＮＴＳＣ信号を出力可能なカメラ５Ｆを設置した上で、カメラ５Ｆの電源投入と共に、カメラ５Ｆは、別の場所に配置されたアナログモニター１６に、同軸ケーブル３及びフィルタ１５を経由して、アナログＮＴＳＣ信号の映像を送信することとしても良い。 (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.

（付記）
以上、本発明の実施の形態を詳細に開示し記述したが、以上の記述は本発明の適用可能な局面を例示したものであって、本発明はこれに限定されるものではない。即ち、記述した局面に対する様々な修正や変形例を、この発明の範囲から逸脱することの無い範囲内で考えることが可能である。 (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.

本発明は、例えば警備会社等に於ける監視システムに適用可能である。   The present invention can be applied to a monitoring system in a security company, for example.

本発明の実施の形態１に係るネットワーク型録画システムの構成を模式的に示すブロック図である。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. 合成された分割表示画面を例示する図である。It is a figure which illustrates the division | segmentation display screen combined. 本発明の実施の形態２に係るネットワーク型録画システムの構成を模式的に示すブロック図である。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. 本発明の変形例に係る録画システムの構成を模式的に示すブロック図である。It is a block diagram which shows typically the structure of the video recording system which concerns on the modification of this invention.

符号の説明Explanation of symbols

１ 記録装置本体、２ ＨＤＤ、３ 同軸ケーブル、４ 分配器、５Ａ，５Ｂ，５Ｃ，５Ｄ，５Ｅ，５Ｆ カメラ、６，８，１２，１４，１６ モニター、７ 操作部。
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 (6)

カメラ、記録装置本体、モニター及び操作部の各々を同軸ケーブル上に接続し、且つ、前記同軸ケーブルの各々をツリー状に接続して前記記録装置本体をホスト端末とするネットワークを構成したことを特徴とする、
ネットワーク型録画システム。 A camera, a recording apparatus main body, a monitor, and an operation unit are connected to each other on a coaxial cable, and each of the coaxial cables is connected in a tree shape to constitute a network having the recording apparatus main body as a host terminal. And
Network recording system. 請求項１記載のネットワーク型録画システムであって、
前記カメラ、前記モニター及び前記操作部の各端末機器は端末属性を有し、前記各端末機器はＩＰプロトコルによる通信を行うことによって対応する前記端末属性を前記記録装置本体に送信することを特徴とする、
ネットワーク型録画システム。 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 according to an IP protocol. To
Network recording system. 請求項２記載のネットワーク型録画システムであって、
前記記録装置本体は、接続された端末情報をダイナミックに検出し、検出された端末機器の台数、種類に応じて制御変更可能な、
ネットワーク型録画システム。 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. 請求項３記載のネットワーク型録画システムであって、
前記記録装置本体は、ツリー状の前記同軸ケーブルの各々を利用して前記各端末機器に電源を供給すると共に、映像とは異なる帯域の周波数を有する通信信号は前記電源に重畳されて送信されることを特徴とする、
ネットワーク型録画システム。 The network type recording system according to claim 3,
The recording apparatus main body supplies power to the terminal devices using each of the tree-shaped coaxial cables, 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. 請求項４記載のネットワーク型録画システムであって、
前記記録装置本体は、ネットワーク上の前記モニターの種類に応じて、デジタルデータ又はアナログＮＴＳＣ信号を前記モニターに送信することを特徴とする、
ネットワーク型録画システム。 The network type recording system according to claim 4,
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. 請求項４記載のネットワーク型録画システムであって、
前記カメラは、ネットワーク上に接続されている前記モニターの種類に応じて、デジタル圧縮データのみを、又は、デジタル圧縮データ及びアナログＮＴＳＣ信号を同時に、前記記録装置本体に送信することを特徴とする、
ネットワーク型録画システム。
The network type recording system according to claim 4,
The camera transmits only the digital compressed data or the digital compressed data and the analog NTSC signal simultaneously to the recording apparatus body according to the type of the monitor connected on the network.
Network recording system.
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