JPS636983A - Picture transmission system - Google Patents

Picture transmission system

Info

Publication number
JPS636983A
JPS636983A JP61150303A JP15030386A JPS636983A JP S636983 A JPS636983 A JP S636983A JP 61150303 A JP61150303 A JP 61150303A JP 15030386 A JP15030386 A JP 15030386A JP S636983 A JPS636983 A JP S636983A
Authority
JP
Japan
Prior art keywords
transmission
signal
image
transmission path
address
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61150303A
Other languages
Japanese (ja)
Inventor
Yoshinori Watanabe
善規 渡辺
Kenzo Ono
大野 健造
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP61150303A priority Critical patent/JPS636983A/en
Publication of JPS636983A publication Critical patent/JPS636983A/en
Pending legal-status Critical Current

Links

Landscapes

  • Small-Scale Networks (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To constitute the titled system of a device uniform in construction and to improve a reliability without requiring any complicated device by recognizing the absence of a signal on a transmission path then transmitting a picture including a destination device address signal. CONSTITUTION:In case of transmission, the output of a controller 7 recognizes that the transmission path 1 is not used by another device, thereafter, controls a signal from a picture input device 8 through a switch 9, thereby transmits via an interface to the transmission path. Such a signal has the destination device address and a transmission source device address by an address inserting device 10. The transmitted signal is reproduced, further its cycle is monitored by a horizontal synchronizing signal monitor part 11 and if the cycle is not disarranged, the transmission is continued. When the disarrangement in the cycle is detected, the controller 7 interrupts the transmission and activates a timer 12. When the timer 12 counts a specific value, it informs to the controller 7 and resumes a transmission operation.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、動画像による構内通信システムに関する。[Detailed description of the invention] Industrial applications The present invention relates to a local communication system using moving images.

従来の技術 従来例の動画像伝送システムを第3図に示す。Conventional technology A conventional moving image transmission system is shown in FIG.

第3図は、電子会議等のシステムであり、放送型システ
ムと異なり、交換機2oにだいし、動画像入力装置及び
動画像表示装置を持つ動画像端末21〜26を接続し、
交換機により設定された回線により、端末間通信を可能
としていた。
FIG. 3 shows a system for electronic conferences, etc., and unlike a broadcasting type system, moving image terminals 21 to 26 having a moving image input device and a moving image display device are connected to an exchange 2o.
Communication between terminals was possible through lines set up by exchanges.

発明が解決しようとする問題点 従来の動画像伝送システムでは、交換機等の複雑なセン
タ装置を必要とし、センタ装置の障害は、システム全体
の機能停止させ、信頴性の面で問題があった。
Problems to be Solved by the Invention Conventional video transmission systems require complex center equipment such as switching equipment, and failure of the center equipment causes the entire system to stop functioning, which poses problems in terms of reliability. .

問題点を解決するための手段 本発明は、上記問題点を解決するため、バスまたは、ス
ターカプラ等の共有型伝送路に、複数の画像送受信装置
を接続し、各装置は、伝送路上に信号が存在しないこと
を確認した後、宛先装置アドレス信号を含む画像を送出
するとともに、伝送路上の信号中の同期信号間隔の監視
をおこない、間隔が乱れたなら、送出を停止し、特定時
間後、新たに送出動作をおこない、受信装置では、自己
アドレスと一致した画像信号のみを再生することを特徴
とする動画像伝送システムである。
Means for Solving the Problems In order to solve the above problems, the present invention connects a plurality of image transmitting/receiving devices to a shared transmission path such as a bus or a star coupler, and each device transmits a signal on the transmission path. After confirming that there is no , it sends out an image including the destination device address signal, and monitors the synchronization signal interval in the signal on the transmission path. If the interval is disturbed, it stops sending, and after a certain time, This moving image transmission system is characterized in that a new transmission operation is performed, and the receiving device reproduces only the image signal that matches its own address.

作用 本発明は、上記した様に均一構成の装置によりシステム
を構築でき、各画像送受信装置が、分散して独立に伝送
路の使用権を獲得し送信が可能であるため、複雑な装置
を必要とせず、信頼性が向上できる。
Effects of the present invention As described above, a system can be constructed using uniformly configured devices, and each image transmitting/receiving device can acquire the right to use a transmission path and transmit data independently in a distributed manner, thereby eliminating the need for complicated devices. Reliability can be improved without

実施例 第1図は、本発明による画像伝送システムの一実施例を
示すシステム構成図である。第1図において、1はバス
型の伝送路であり、この伝送路に各々同一の構造を有す
る画像送受信装置2〜4が接続される。画像送受信装置
4の内部には、伝送路上の信号を装置に入出力するイン
ターフェイス6があり、この出力は、信号再生部6によ
り常時再生監視されている。
Embodiment FIG. 1 is a system configuration diagram showing an embodiment of an image transmission system according to the present invention. In FIG. 1, reference numeral 1 indicates a bus-type transmission line, and image transmitting/receiving apparatuses 2 to 4 each having the same structure are connected to this transmission line. Inside the image transmitting/receiving device 4, there is an interface 6 for inputting/outputting a signal on a transmission path to/from the device, and this output is constantly monitored for reproduction by a signal reproducing section 6.

送信の際、コントローラ了は、この出力より伝送路を他
の装置が使用していないことを確認したのち、画像入力
装置8からの信号をスイッチ9をコントロールすること
により、インターフェイスを経由して伝送路へ送出する
。この信号は、画像信号(側光ば、コンボジッ)NTS
C信号の垂直ブランキング期間)の特定位置に宛先装置
アドレス、自装置アドレス信号を重畳する機能を有する
アドレス挿入装置によシ、宛先装置アドレス及び送信元
装置アドレスを有している。送出された信号は、6によ
り信号が再生され、さらに水平同期信号監視部11によ
り、その周期が監視され、周期が乱れなければ、送出を
続ける0 しかし、伝送路上での信号伝播遅延により、ある装置が
送信を開始しているにも関わらず、伝送路上の信号が到
着しないため、他の装置が送信可能と判断して送信を開
始し、競合が発生する場合がある。この場合、送出され
た信号が重畳されるため、水平同期信号監視部11は、
水平同期信号の周期の乱れを検出し、コントローラ7に
通知する。このとき、コントローラ7は、9を制御する
ことにより、送出を中断するとともに、タイマ12に起
動をかける。・タイマ12は、特定の値(例えば、装置
に固有な値、または、検出の都度、乱数により決定され
る値等)を計数したなら、コントローラ7に通知し7は
再び上記送信動作を開始する。この再試行の動作は、送
信が競合しているお互いの装置でおこなわれる。
When transmitting, the controller confirms from this output that no other device is using the transmission path, and then transmits the signal from the image input device 8 via the interface by controlling the switch 9. Send it to the road. This signal is an image signal (side light, combo image) NTS
The address insertion device has a function of superimposing the destination device address and own device address signal at a specific position during the vertical blanking period of the C signal, and has the destination device address and the source device address. The transmitted signal is regenerated by 6, and its period is further monitored by the horizontal synchronization signal monitoring section 11. If the period is not disturbed, the transmission continues. Even though a device has started transmitting, a signal on the transmission path does not arrive, so another device determines that it can transmit and starts transmitting, causing a conflict. In this case, since the transmitted signals are superimposed, the horizontal synchronization signal monitoring section 11
A disturbance in the period of the horizontal synchronization signal is detected and notified to the controller 7. At this time, the controller 7 interrupts the transmission and starts the timer 12 by controlling the controller 9. - When the timer 12 counts a specific value (for example, a value unique to the device or a value determined by random numbers each time it is detected), it notifies the controller 7, and the controller 7 starts the above-mentioned transmission operation again. . This retry operation is performed by both devices competing for transmission.

受信動作時は、信号再生部6において、伝送路上の信号
の同期確立がおこなわれ、画像信号に含まれる(例えば
、垂直ブランキング期間中に重畳されている)宛先装置
アドレスがアドレス比較部13により検査され、自装置
宛信号であるならば、コントローラ7にこれが通知され
る。7は、スイッチ14を制御し、表示部15において
画像信号が再生される。
During the reception operation, the signal reproduction section 6 establishes synchronization of the signals on the transmission path, and the address comparison section 13 compares the destination device address included in the image signal (for example, superimposed during the vertical blanking period). The signal is checked, and if the signal is addressed to the device itself, the controller 7 is notified of this. 7 controls the switch 14, and the image signal is reproduced on the display section 15.

第2図は、伝送路上の画像信号(NTSCコンポジット
信号)の例であり、16は動画信号、17は水平同期信
号、18は垂直帰線消去期間であり、この−部である例
えば19に、パルス信号等の形で、宛先装置アドレス、
送信元装置アドレスが、重畳される。
FIG. 2 shows an example of an image signal (NTSC composite signal) on a transmission path, where 16 is a moving image signal, 17 is a horizontal synchronization signal, 18 is a vertical blanking period, and the minus part, for example 19, is destination device address, in the form of a pulse signal, etc.
The source device address is superimposed.

前記実施例では、伝送路上は、−方向の通信のみに専有
されるが、伝送路を二重化しく物理的に、二つの伝送路
でもよいが、一つの伝送路上を周波数多重等の多重技術
によシ二重化しても良い)、その−方(例えば、伝送路
上)で、前述の制御をおこない、これにより、確定した
送受信装置の対に対し、他方の伝送路(伝送路B)は、
自動的にこの送受信装置の対に使用権を与えることとす
れば、伝送路上にて受信をおこなっている装置が、伝送
路Bにて送信をおこなうことにより、装置間で全二重通
信が可能である。
In the embodiment described above, the transmission path is exclusively used for communication in the - direction, but the transmission path may be duplicated, physically using two transmission paths, or one transmission path may be used using a multiplexing technique such as frequency multiplexing. The above-mentioned control is performed on one side (for example, the transmission line), and as a result, for the determined pair of transmitter/receiver, the other transmission line (transmission line B)
If usage rights are automatically given to this pair of transmitter/receiver devices, the device receiving on the transmission path will be able to transmit on transmission path B, allowing full-duplex communication between the devices. It is.

また、さらに伝送路上を、周波数多重より複数の動画像
伝送帯域に分割し、前記の様に組み合わせた2つの帯域
を一つの回線とすることにより、物理的には、一つの伝
送路上で、複数の全二重画像回線を確保できる。この様
に複数回線が存在し、その内の空き回線を各装置が自立
的に送信権を得る場合は、一つの回線で、送信の試行を
おこない、失敗した装置は、直ちに他の空き回線に対し
、同様の試行を試みる様に制御することにより、接続の
遅延を軽減できる。
In addition, by further dividing the transmission path into multiple video transmission bands using frequency multiplexing and combining the two bands as described above into one line, it is possible to physically A full-duplex image line can be secured. If there are multiple lines in this way, and each device independently obtains the right to transmit on one of the free lines, it will attempt to transmit on one line, and if the device fails, it will immediately transfer to another free line. On the other hand, by controlling the connection so that similar attempts are made, the connection delay can be reduced.

発明の効果 以上の様に、本発明によれば、システムは全て均一な構
成の動画像送受信装置により構成され、各装置が独立に
送信を行うことが可能であるため、システムの信頼性の
向上がはかれる。
Effects of the Invention As described above, according to the present invention, the system is composed of all moving image transmitting/receiving devices having a uniform configuration, and each device can transmit data independently, thereby improving the reliability of the system. is measured.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明による画像伝送システムの一実施例のブ
ロック図、第2図は第1図における動画像信号の概略波
形図、第3図は従来例の画像伝送システムの構成図であ
る。 1・・・・・・バス型伝送路、2.3.4・・・・・・
動画像送受信装置、5・・・・・・インターフェイス、
6・・・・・信号再生ブロック、7・・・・・・コント
ローラ、8・・・・・・入力部、9.14・・・・・・
スイッチ、10・・・・・・アドレス挿入部、11・・
・・・・水平同期信号監視部、12・・・・・・タイマ
、13・・・・・・アドレス比較部、15・・・・・・
表示部。
FIG. 1 is a block diagram of an embodiment of an image transmission system according to the present invention, FIG. 2 is a schematic waveform diagram of a moving image signal in FIG. 1, and FIG. 3 is a configuration diagram of a conventional image transmission system. 1... Bus type transmission line, 2.3.4...
Moving image transmitting/receiving device, 5... Interface,
6...Signal reproduction block, 7...Controller, 8...Input section, 9.14...
Switch, 10...Address insertion section, 11...
...Horizontal synchronization signal monitoring unit, 12...Timer, 13...Address comparison unit, 15...
Display section.

Claims (3)

【特許請求の範囲】[Claims] (1)バスまたは、スターカプラ等の共有型伝送路に、
複数の画像送受信装置を接続し、各装置は、伝送路上に
信号が存在しないことを確認した後、宛先装置アドレス
信号を含む画像を送出するとともに、伝送路上の信号中
の同期信号間隔の監視をおこない、間隔が乱れたなら、
送出を停止し、特定時間後、新たに送出動作をおこない
、受信装置では、自己アドレスと一致した画像信号のみ
を再生することを特徴とする画像伝送システム。
(1) On a shared transmission line such as a bus or star coupler,
After connecting multiple image transmitting/receiving devices and confirming that no signal exists on the transmission path, each device transmits an image including the destination device address signal and monitors the synchronization signal interval among the signals on the transmission path. If the interval is irregular,
An image transmission system characterized in that transmission is stopped, a new transmission operation is performed after a specified time, and a receiving device reproduces only an image signal that matches its own address.
(2)共有型の伝送路は対になっており、対の一方の伝
送路で送信権獲得動作を行ない、送信権を獲得すると対
の他の伝送路の送信権を自動的に得ることを特徴とする
特許請求の範囲第1項記載の画像伝送システム。
(2) Shared transmission lines are in pairs, and when one transmission line of the pair acquires the transmission right, the transmission right of the other transmission line of the pair is automatically acquired. An image transmission system according to claim 1, characterized in that:
(3)伝送路は複数対の伝送路からなり、一対の伝送路
で送信権を獲得できなかった場合、自動的に他の対の伝
送路を選択し、送信権の獲得動作をすることを特徴とす
る特許請求の範囲第2項記載の画像伝送システム。
(3) The transmission path consists of multiple pairs of transmission paths, and if the transmission right cannot be acquired with one pair of transmission paths, another pair of transmission paths is automatically selected and the transmission right acquisition operation is performed. An image transmission system according to claim 2 characterized by:
JP61150303A 1986-06-26 1986-06-26 Picture transmission system Pending JPS636983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61150303A JPS636983A (en) 1986-06-26 1986-06-26 Picture transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61150303A JPS636983A (en) 1986-06-26 1986-06-26 Picture transmission system

Publications (1)

Publication Number Publication Date
JPS636983A true JPS636983A (en) 1988-01-12

Family

ID=15494057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61150303A Pending JPS636983A (en) 1986-06-26 1986-06-26 Picture transmission system

Country Status (1)

Country Link
JP (1) JPS636983A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141053A (en) * 1982-02-16 1983-08-22 Fujitsu Ltd Collision detection system
JPS59186457A (en) * 1983-04-08 1984-10-23 Matsushita Electric Ind Co Ltd Network control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141053A (en) * 1982-02-16 1983-08-22 Fujitsu Ltd Collision detection system
JPS59186457A (en) * 1983-04-08 1984-10-23 Matsushita Electric Ind Co Ltd Network control system

Similar Documents

Publication Publication Date Title
US7365772B2 (en) Communication method and monitoring camera system
EP0268664B1 (en) A method of coupling a data transmitter unit to a signal line and an apparatus for performing the invention
JPS636983A (en) Picture transmission system
JPH05336141A (en) Loop network
JP4595195B2 (en) Security system
JPS58170247A (en) Automatic loop back controlling system
JP3369035B2 (en) Communication control method between microcontrollers
JP2000101989A (en) Monitoring system for building
JP2938495B2 (en) Network monitoring equipment
JP2566022B2 (en) Optical ring bus control system
JP3060713U (en) Surveillance camera system
JPS61173546A (en) Channel control method
JPH03136426A (en) Transmission control method for plotting communication system
JPH01220094A (en) Home bus system
JPS639248A (en) Local area network
JPH02288442A (en) Plural protocol controller
JPH0583018B2 (en)
JPS6374345A (en) Analog signal transmission equipment
JPH099250A (en) Picture transmission system
JPH0575213B2 (en)
JPH04132337A (en) Bus connection communication system
JPH04260200A (en) Self-fire accident information system
JPH0121650B2 (en)
JPH04292086A (en) Remote supervisory device
JPS63207297A (en) Centralized monitor equipment