JPH0720242B2 - Optical transceiver - Google Patents
Optical transceiverInfo
- Publication number
- JPH0720242B2 JPH0720242B2 JP61034616A JP3461686A JPH0720242B2 JP H0720242 B2 JPH0720242 B2 JP H0720242B2 JP 61034616 A JP61034616 A JP 61034616A JP 3461686 A JP3461686 A JP 3461686A JP H0720242 B2 JPH0720242 B2 JP H0720242B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- horizontal
- receiver
- vertical
- 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.)
- Expired - Lifetime
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- Optical Communication System (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、光画像伝送システム等に用いることができる
光送受信装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmitter / receiver that can be used in an optical image transmission system or the like.
従来の技術 光ファイバを用いた光伝送は、広帯域，低損失，無誘導
と言う特徴を持っており、監視カメラや工業用カメラの
映像信号を伝送する光画像伝送システムとして応用され
ている。2. Description of the Related Art Optical transmission using an optical fiber has the characteristics of wide band, low loss, and no induction, and is applied as an optical image transmission system for transmitting video signals of surveillance cameras and industrial cameras.
しかし、カメラを用いる時、映像信号だけでなく、カメ
ラを動作させるための水平同期信号及び垂直同期信号を
伝送する必要が生じることもある。このような場合に、
映像信号と水平同期信号と垂直同期信号を別々に伝送し
ていたのでは、３セットの光送受信装置と３本の光ファ
イバが必要となり、コストの面などの問題がある。そこ
で、水平同期信号と垂直同期信号を混合し、さらに光分
岐・結合器や光分波・合波器を用い、映像信号と同期信
号とを１本の光ファイバで伝送する一心双方向光伝送が
行なわれる。However, when using a camera, it may be necessary to transmit not only a video signal but also a horizontal synchronizing signal and a vertical synchronizing signal for operating the camera. In such cases,
If the video signal, the horizontal synchronizing signal, and the vertical synchronizing signal are separately transmitted, three sets of optical transmitting / receiving devices and three optical fibers are required, which causes a problem of cost. Therefore, the horizontal synchronization signal and the vertical synchronization signal are mixed, and further, an optical branching / combining device and an optical demultiplexing / combining device are used to transmit the video signal and the synchronization signal through one optical fiber. Is performed.
以下、図面を参照しながら、上述したような従来の一心
双方向光画像伝送装置について説明する。Hereinafter, the conventional single-fiber bidirectional optical image transmission device as described above will be described with reference to the drawings.
第３図は、従来の一心双方向光画像伝送装置の構成図を
示すものである。第３図において、１はカメラからの映
像信号VIDEOを電気−光変換する第１の光送信器であ
る。２は、光伝送されてきた水平・垂直混合同期信号Ｂ
を光−電気変換する第１の光受信器である。３は、第１
の光送信器１から光伝送されてきた映像信号Ａを光−電
気変換する第２の光受信器である。４は、水平・垂直混
合同期信号HVDを電気−光変換し、第１の光受信器２へ
光伝送する第２の光送信器である。５は、第１の光送信
器と第１の光受信器を結合する第１の光分岐・結合器で
ある。６は、第２の光送信器と第２の光受信器を結合す
る第２の光分岐・結合器である。７は、水平同期信号HD
と垂直同期信号VDを混合し、水平・垂直同期信号HVDを
出力する混合回路である。８は、水平・垂直混合同期信
号HVDから水平同期信号HDと垂直同期信号VDを分離する
分離回路である。以上の構成は第１図と同様である。FIG. 3 is a block diagram of a conventional single-fiber bidirectional optical image transmission device. In FIG. 3, reference numeral 1 is a first optical transmitter for electro-optically converting a video signal VIDEO from the camera. 2 is a horizontal / vertical mixed sync signal B that has been transmitted optically.
Is a first optical receiver for converting light into electricity. 3 is the first
2 is a second optical receiver for optically-electrically converting the video signal A optically transmitted from the optical transmitter 1 of FIG. A second optical transmitter 4 electrically-optically converts the horizontal / vertical mixed synchronizing signal HVD and optically transmits it to the first optical receiver 2. Reference numeral 5 is a first optical branching / combining device that connects the first optical transmitter and the first optical receiver. Reference numeral 6 is a second optical branching / combining device that connects the second optical transmitter and the second optical receiver. 7 is the horizontal sync signal HD
And a vertical synchronizing signal VD and outputs a horizontal / vertical synchronizing signal HVD. Reference numeral 8 denotes a separation circuit for separating the horizontal / vertical mixed sync signal HVD from the horizontal sync signal HD and the vertical sync signal VD. The above configuration is the same as in FIG.
以上のように構成された従来の一心双方向光画像伝送装
置について、以下その動作を説明する。The operation of the conventional single-fiber bidirectional optical image transmission device configured as described above will be described below.
カメラからの映像信号VIDEOは、第１の光送信器１によ
って電気−光変換され光信号Ａとして出力される。その
光信号Ａは、第１の光分岐・結合器５を通って光ファイ
バに結合される。光ファイバを伝送された光信号Ａは第
２の光分岐・結合器６によって第２の光受信器３に入力
され、光−電気変換され、映像信号VIDEOとして出力さ
れ、テレビモニタに供給される。The video signal VIDEO from the camera is electro-optically converted by the first optical transmitter 1 and output as an optical signal A. The optical signal A is coupled to the optical fiber through the first optical branching / combining device 5. The optical signal A transmitted through the optical fiber is input to the second optical receiver 3 by the second optical branching / combining device 6, is opto-electrically converted, is output as a video signal VIDEO, and is supplied to the television monitor. .
一方、水平同期信号HDと垂直同期信号VDは、混合回路７
で混合され、水平・垂直混合同期信号HVDとして出力さ
れる。水平・垂直混合同期信号HVDは、第２の光送信器
４によって電気−光変換され光信号Ｂとして出力され
る。その光信号Ｂは、第２の光分岐・結合器６を通って
光ファイバに結合される。光ファイバを伝送された光信
号Ｂは、第１の光分岐・結合器５によって第１の光受信
器２に入力され、光−電気変換され、水平・垂直混合同
期信号HVDとして出力される。その出力された水平・垂
直混合同期信号HVDは、分離回路８で、水平同期信号HD
と垂直同期信号VDに分離され、カメラに供給される。On the other hand, the horizontal synchronizing signal HD and the vertical synchronizing signal VD are mixed by the mixing circuit 7
Are mixed in and output as a horizontal / vertical mixed sync signal HVD. The horizontal / vertical mixed synchronizing signal HVD is electro-optically converted by the second optical transmitter 4 and output as an optical signal B. The optical signal B is coupled to the optical fiber through the second optical branching / combining device 6. The optical signal B transmitted through the optical fiber is input to the first optical receiver 2 by the first optical branching / combining device 5, is optoelectrically converted, and is output as a horizontal / vertical mixed synchronizing signal HVD. The output horizontal / vertical mixed sync signal HVD is output by the separation circuit 8 to the horizontal sync signal HD.
And vertical sync signal VD is separated and supplied to the camera.
しかしながら、上記のような構成では、光ファイバ長の
変化によって、第２の光受信器３で受光される光信号
（映像信号）Ａの映像期間内に第２光の光送信器４が発
光する場合があるが、第２の光分岐・結合器６のアイソ
レーションの不完全さで、第２の光送信器４の光出力Ｂ
が光信号Ａにまぎれることがある（第４図の斜線）。However, in the above configuration, the optical transmitter 4 of the second light emits light within the video period of the optical signal (video signal) A received by the second optical receiver 3 due to the change of the optical fiber length. In some cases, due to the imperfect isolation of the second optical branching / combining device 6, the optical output B of the second optical transmitter 4
May be mixed up with the optical signal A (hatched in FIG. 4).
映像信号は、特にS/Nに厳しいものが要求されるので、
上記（第４図）のようなことが生じるとテレビモニタの
画像に大きな劣化が起こる。このようなことを避けるに
は、、高アイソレーション比の光分岐・結合器を使
う、、光ファイバ，光コネタプラグの端面を斜めなど
に研磨し反射を防ぐ、、第２の光送信器の発光出力を
低下させる、、第２の光受信器の受光レベルを上げ
る、、第１の光送信器の発光出力を上げるなどの方法
があるが、●コストが上がる（，）、●伝送距離の
低下（，）、●信頼性・寿命の低下（）、などの
欠点を有していた。Since the video signal is required to be particularly severe in S / N,
When the above (FIG. 4) occurs, the image on the television monitor is greatly deteriorated. To avoid this, use an optical splitter / coupler with a high isolation ratio, polish the end faces of the optical fiber and optical connector plug diagonally to prevent reflection, and There are ways to reduce the light emission output, increase the light reception level of the second optical receiver, increase the light emission output of the first optical transmitter, etc. ● Increased cost (,), ● Transmission distance However, it had drawbacks such as reduced reliability (,) and reduced reliability and life ().
発明が解決しようとする問題点 本発明は、上記欠点に鑑み、コストの上昇，伝送距離の
低下、信頼性・寿命の低下をともなうことがなく、高品
質な画像を保ちながら、一心双方向の光信号伝送を可能
とする光送受信装置を提供するものである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In view of the above-described drawbacks, the present invention is capable of bidirectional single-axis communication while maintaining high-quality images without increasing costs, reducing transmission distances, and reducing reliability and life. An optical transceiver that enables optical signal transmission is provided.
問題点を解決するための手段 上記問題点を解決するために、本発明の光送受信装置
は、カメラから出力される映像信号を光信号に変換する
第１の光送信器と、カメラ用水平・垂直混合同期信号を
受光し電気信号に変換する第１の光受信器と、第１の光
送信器から光伝送されてきた映像信号を受光する第２の
光受信器と、カメラ用水平・垂直混合同期信号を光信号
に変換し第１の光受信器へ光伝送する第２の光送信器
と、第１の光送信器と第１の光受信器を結合する第１の
光分岐・結合器と第２の光送信器と第２の光受信器を結
合する第２の光分岐・結合器と、水平同期信号と垂直同
期信号を混合しカメラ用水平・垂直混合同期信号を出力
する混合回路と、カメラ用水平・垂直混合同期信号から
水平同期信号と垂直同期信号を分離する分離回路と、第
２の光送信器の発光期間と第２の光受信器で受光される
映像信号のフランキング期間とが一致するように第１の
光受信器から出力されるカメラ用水平・垂直混合同期信
号の位相を調整する位相調整回路とから構成されてい
る。Means for Solving the Problems In order to solve the above problems, an optical transceiver of the present invention includes a first optical transmitter for converting a video signal output from a camera into an optical signal, and a horizontal camera. A first optical receiver for receiving the vertical mixed sync signal and converting it into an electric signal, a second optical receiver for receiving the video signal optically transmitted from the first optical transmitter, and horizontal / vertical for camera A second optical transmitter for converting the mixed sync signal into an optical signal and optically transmitting the optical signal to the first optical receiver, and a first optical branching / coupling coupling the first optical transmitter and the first optical receiver Second optical branching / combining device for combining the optical device, the second optical transmitter and the second optical receiver, and mixing for mixing the horizontal synchronizing signal and the vertical synchronizing signal and outputting the horizontal / vertical mixed synchronizing signal for the camera Circuit and separation circuit that separates horizontal and vertical sync signals from the horizontal and vertical mixed sync signals for the camera And the horizontal / vertical mixing for the camera output from the first optical receiver so that the light emitting period of the second optical transmitter and the flanking period of the video signal received by the second optical receiver coincide with each other. And a phase adjustment circuit that adjusts the phase of the synchronization signal.
作用 この構成によって、第２の光受信器で受光される映像信
号のブランキング期間内に第２の光送信器を発光させる
ことによって、第２の光送信器の光信号が、第２の光受
信器にまぎれこんでも、ブランキング期間であるのでテ
レビモニタ画面に劣化を与えることがなく、コストの上
昇、伝送距離の低下、信頼性・寿命の低下をともなわ
ず、高品質な画像の一心双方向光伝送が可能となる。With this configuration, the optical signal of the second optical transmitter is changed to the second optical signal by causing the second optical transmitter to emit light within the blanking period of the video signal received by the second optical receiver. Even if it gets caught in the receiver, it is in the blanking period, so it does not deteriorate the TV monitor screen, and it does not increase the cost, the transmission distance, the reliability and the life, and the high quality image Optical transmission becomes possible.
実施例 以下、本発明の一実施例について、図面を参照しながら
説明する。Embodiment One embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明の光送受信装置による一心双方向画像
伝送システムの構成を示すものである。第１図におい
て、１はカメラからの映像信号VIDEOを電気−光変換す
る第１の光送信器である。２は、光伝送されてきた水平
・垂直混合同期信号Ｂを光−電気変換する第１の光受信
器である。３は、第１の光送信器１から光伝送されてき
た映像信号Ａを光−電気変換する第２の光受信器であ
る。４は、水平・垂直混合同期信号HVDを電気−光変換
し、第１の光受信器２へ光伝送する第２の光送信器であ
る。５は、第１の光送信器と第１の光受信器を結合する
第１の光分岐・結合器である。６は、第２の光送信器と
第２の光受信器を結合する第２の光分岐・結合器であ
る。FIG. 1 shows the configuration of a one-fiber bidirectional image transmission system using the optical transmitter-receiver of the present invention. In FIG. 1, reference numeral 1 is a first optical transmitter for electro-optically converting a video signal VIDEO from a camera. Reference numeral 2 is a first optical receiver that optically-electrically converts the horizontal / vertical mixed synchronizing signal B that has been optically transmitted. Reference numeral 3 is a second optical receiver that optically-electrically converts the video signal A optically transmitted from the first optical transmitter 1. A second optical transmitter 4 electrically-optically converts the horizontal / vertical mixed synchronizing signal HVD and optically transmits it to the first optical receiver 2. Reference numeral 5 is a first optical branching / combining device that connects the first optical transmitter and the first optical receiver. Reference numeral 6 is a second optical branching / combining device that connects the second optical transmitter and the second optical receiver.
７は、水平同期信号HDと垂直同期信号VDを混合し、水平
・垂直混合同期信号HVDを出力する混合回路である。８
は、水平・垂直混合同期信号HVDから水平同期信号HDと
垂直同期信号VDを分離する分離回路である。９は、第２
の光送信器４の発光期間と第２の光受信器３で受光され
る映像信号Ａのブランキング期間とが一致するように第
１の光受信器２から出力される水平・垂直混合同期信号
HVDの位相を調整する位相調整回路である。A mixing circuit 7 mixes the horizontal synchronizing signal HD and the vertical synchronizing signal VD and outputs a horizontal / vertical mixed synchronizing signal HVD. 8
Is a separation circuit that separates the horizontal / vertical mixed sync signal HVD from the horizontal sync signal HD and the vertical sync signal VD. 9 is the second
The horizontal / vertical mixed sync signal output from the first optical receiver 2 so that the light emitting period of the optical transmitter 4 and the blanking period of the video signal A received by the second optical receiver 3 coincide with each other.
It is a phase adjustment circuit that adjusts the phase of the HVD.
以上のように構成された、本光送受信装置について、以
下その動作を説明する。The operation of the present optical transmitter / receiver configured as described above will be described below.
カメラからの映像信号VIDEOは、第１の光送信器１によ
って電気−光変換された光信号Ａとして出力される。そ
の光信号Ａは第１の光分岐・結合器５を通って光ファイ
バに結合される。光ファイバを伝送された光信号Ａは第
２の光分岐・結合器６によって第２の光受信器３に入力
され、光−電気変換され、映像信号VIDEOとして出力さ
れ、テレビモニタに供給される。The video signal VIDEO from the camera is output as an optical signal A that is electro-optically converted by the first optical transmitter 1. The optical signal A is coupled to the optical fiber through the first optical branching / combining device 5. The optical signal A transmitted through the optical fiber is input to the second optical receiver 3 by the second optical branching / combining device 6, is opto-electrically converted, is output as a video signal VIDEO, and is supplied to the television monitor. .
一方、水平同期信号HDと垂直同期信号VDは、混合回路７
で混合され、水平・垂直混合同期信号HVDとして出力さ
れる。水平・垂直混合同期信号HVDは、第２の光送信器
４によって電気−光変換され光信号Ｂとして出力され
る。その光信号Ｂは、第２の光分岐・結合器６を通って
光ファイバに結合される。光ファイバを伝送された光信
号Ｂは、第１の光分岐・結合器５によって第１の光受信
器２に入力され、光−電気変換され、水平・垂直混合同
期信号HVDとして出力される。その水平・垂直混合同期
信号HVDは、第２の光送信器４の発光期間と第２の光受
信器３で受光される映像信号Ａのブランキング期間とが
一致するように（第２図）位相調整回路９で位相を調整
された後、分離回路８に入力され、水平同期信号HDと垂
直同期信号VDに分離され、カメラに供給される。On the other hand, the horizontal synchronizing signal HD and the vertical synchronizing signal VD are mixed by the mixing circuit 7
Are mixed in and output as a horizontal / vertical mixed sync signal HVD. The horizontal / vertical mixed synchronizing signal HVD is electro-optically converted by the second optical transmitter 4 and output as an optical signal B. The optical signal B is coupled to the optical fiber through the second optical branching / combining device 6. The optical signal B transmitted through the optical fiber is input to the first optical receiver 2 by the first optical branching / combining device 5, is optoelectrically converted, and is output as a horizontal / vertical mixed synchronizing signal HVD. The horizontal / vertical mixed sync signal HVD is adjusted so that the light emission period of the second optical transmitter 4 and the blanking period of the video signal A received by the second optical receiver 3 coincide with each other (FIG. 2). After the phase is adjusted by the phase adjusting circuit 9, it is input to the separating circuit 8, separated into the horizontal synchronizing signal HD and the vertical synchronizing signal VD, and supplied to the camera.
ここで、第２の光受信器３で受光される光信号（映像信
号）Ａに第２の光送信器４の光出力Ｂがまぎれこんでも
（第２図の斜線）、ブランキング期間内なので、画面上
に現われて面質を劣化させることもなく、又、同期を乱
すほど大きくないので問題ない。Here, even if the optical output B of the second optical transmitter 4 is mixed in the optical signal (video signal) A received by the second optical receiver 3 (shaded line in FIG. 2), it is within the blanking period. There is no problem because it does not appear on the screen and deteriorates the surface quality, and it is not large enough to disturb the synchronization.
以上のように本実施例によれば、光ファイバ長が変わっ
ても、コストの上昇、伝送距離の低下、信頼性・寿命の
低下をともなうことがなく、高品質な画像の一心双方向
伝送用光送受信装置が可能となる。As described above, according to this embodiment, even if the optical fiber length is changed, there is no increase in cost, reduction in transmission distance, reduction in reliability / lifetime, and high-quality single-fiber bidirectional transmission. An optical transmitter / receiver becomes possible.
発明の効果 以上のように、本発明によれば、カメラから出力される
映像信号を光信号に変換する第１の光送信器と、カメラ
用水平・垂直混合同期信号を受光し電気信号に変換する
第１の光受信器と、第１の光送信器から光伝送されてき
た映像信号を受光する第２の光受信器と、カメラ用水平
・垂直混合同期信号を光信号に変換し第１の光受信器へ
光伝送する第２の光送信器と第１の光送信器と第１の光
受信器を結合する第１の光分岐・結合器と、第２の光送
信器と第２の光受信器を結合する第２の光分岐・結合器
と、水平同期信号と垂直同期信号を混合しカメラ用水平
・垂直混合同期信号を出力する混合回路と、カメラ用水
平・垂直混合同期信号から水平同期信号と垂直同期信号
を分離する分離回路と、第２の光送信器の発光期間と第
２の光受信器で受光される映像信号のブランキング期間
とが一致するように第１の光受信器から出力されるカメ
ラ用水平・垂直混合同期信号の位相を調整する位相調整
回路とを設けることにより、コストの上昇、伝送距離の
低下、信頼性・寿命の低下をともなわず、高品質な画像
の一心双方向伝送を実現することができ、その実用的効
果は大なるものがある。EFFECTS OF THE INVENTION As described above, according to the present invention, a first optical transmitter for converting a video signal output from a camera into an optical signal, and a horizontal / vertical mixed sync signal for a camera are received and converted into an electrical signal. First optical receiver, a second optical receiver that receives the video signal optically transmitted from the first optical transmitter, and a horizontal / vertical mixed sync signal for a camera that converts the optical signal into an optical signal. Second optical transmitter for optical transmission to the optical receiver, first optical transmitter, first optical branching / coupling device for coupling the first optical receiver, second optical transmitter, and second optical transmitter Second optical branching / combining device for combining the optical receivers, the mixing circuit for mixing the horizontal synchronizing signal and the vertical synchronizing signal and outputting the horizontal / vertical mixed synchronizing signal for the camera, and the horizontal / vertical mixed synchronizing signal for the camera A separation circuit for separating a horizontal synchronization signal and a vertical synchronization signal from the second optical transmitter, a light emission period of the second optical transmitter, and a second light By providing a phase adjustment circuit that adjusts the phase of the horizontal / vertical mixed sync signal for the camera output from the first optical receiver so that the blanking period of the video signal received by the receiver matches, It is possible to realize high-quality one-way bidirectional transmission of images without increasing cost, reducing transmission distance, and decreasing reliability / lifetime, and the practical effects thereof are great.
第１図は本発明の一実施例の光送受信装置による一心双
方向画像伝送システムの構成ブロック図、第２図はその
第２の光受信器の受光波形と第２の光送信器の発光波形
の関係を示す波形図、第３図は従来例の一心双方向光画
像伝送装置の構成ブロック図、第４図は従来例における
第２の光受信器の受光波形と第２の光送信器の発光波形
の関係を示す波形図である。 １……第１の光送信器、２……第１の光受信器、３……
第２の光受信器、４……第２の光送信器、５……第１の
光分岐・結合器、６……第２の光分岐・結合器、７……
同期信号混合回路、８……同期信号分離回路、９……位
相調整回路。FIG. 1 is a block diagram showing the configuration of a one-core bidirectional image transmission system using an optical transmitter / receiver according to an embodiment of the present invention, and FIG. 2 is a light receiving waveform of a second optical receiver and a light emitting waveform of a second optical transmitter. FIG. 3 is a block diagram showing the configuration of a conventional one-core bidirectional optical image transmission device, and FIG. 4 is a diagram showing the received light waveform of the second optical receiver and the second optical transmitter in the conventional example. It is a wave form diagram which shows the relationship of a light emission waveform. 1 ... First optical transmitter, 2 ... First optical receiver, 3 ...
2nd optical receiver, 4 ... 2nd optical transmitter, 5 ... 1st optical branching / combining device, 6 ... 2nd optical branching / combining device, 7 ...
Sync signal mixing circuit, 8 ... Sync signal separating circuit, 9 ... Phase adjusting circuit.
Claims (1)
変換する第１の光送信器と、カメラ用水平・垂直混合同
期信号を受光し電気信号に変換する第１の光受信器と、
前記第１の光送信器から光伝送されてきた映像信号を受
光する第２の光受信器と、カメラ用水平・垂直混合同期
信号を光信号に変換し前記第１の光受信器へ光伝送する
第２の光送信器と、前記第１の光送信器と前記第１の光
受信器を結合する第１の光分岐・結合器と、前記第２の
光送信器と前記第２の光受信器を結合する第２の光分岐
・結合器と、水平同期信号と垂直同期信号とを混合しカ
メラ用水平・垂直混合同期信号を出力する混合回路と、
カメラ用水平・垂直混合同期信号から水平同期信号と垂
直同期信号を分離する分離回路と、前記第２の光送信器
の発光期間と前記第２の光受信器で受光される映像信号
のブランキング期間とが一致するように前記第１の光受
信器から出力されるカメラ用水平・垂直混合同期信号の
位相を調整する位相調整回路とを有することを特徴とす
る光送受信装置。1. A first optical transmitter for converting a video signal output from a camera into an optical signal, and a first optical receiver for receiving a horizontal / vertical mixed sync signal for a camera and converting it into an electric signal.
A second optical receiver for receiving the video signal optically transmitted from the first optical transmitter, and a horizontal / vertical mixed sync signal for a camera, which is converted into an optical signal and optically transmitted to the first optical receiver. A second optical transmitter, a first optical branching / combining device for combining the first optical transmitter and the first optical receiver, the second optical transmitter and the second light A second optical branching / combining device for combining the receiver; a mixing circuit for mixing the horizontal synchronizing signal and the vertical synchronizing signal and outputting a horizontal / vertical mixed synchronizing signal for the camera;
Separation circuit for separating a horizontal synchronization signal and a vertical synchronization signal from a horizontal / vertical mixed synchronization signal for a camera, a light emission period of the second optical transmitter, and a blanking of a video signal received by the second optical receiver. An optical transmitter / receiver, comprising: a phase adjusting circuit for adjusting the phases of the horizontal / vertical mixed sync signals for the camera output from the first optical receiver so that the periods match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61034616A JPH0720242B2 (en) | 1986-02-18 | 1986-02-18 | Optical transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61034616A JPH0720242B2 (en) | 1986-02-18 | 1986-02-18 | Optical transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62190992A JPS62190992A (en) | 1987-08-21 |
| JPH0720242B2 true JPH0720242B2 (en) | 1995-03-06 |
Family
ID=12419306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61034616A Expired - Lifetime JPH0720242B2 (en) | 1986-02-18 | 1986-02-18 | Optical transceiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0720242B2 (en) |
-
1986
- 1986-02-18 JP JP61034616A patent/JPH0720242B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62190992A (en) | 1987-08-21 |
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