JPH0213878B2 - - Google Patents
Info
- Publication number
- JPH0213878B2 JPH0213878B2 JP58010404A JP1040483A JPH0213878B2 JP H0213878 B2 JPH0213878 B2 JP H0213878B2 JP 58010404 A JP58010404 A JP 58010404A JP 1040483 A JP1040483 A JP 1040483A JP H0213878 B2 JPH0213878 B2 JP H0213878B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- section
- time
- transmission
- station
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 37
- 238000004891 communication Methods 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
- H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/24—Systems for the transmission of television signals using pulse code modulation
- H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
- H04N7/54—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal the signals being synchronous
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Television Systems (AREA)
Description
【発明の詳細な説明】
本発明は、時分割多重化した通話信号及び選
局、その他の制御信号を、テレビ映像信号のブラ
ンキング区間にのせて伝送する時分割多重化伝送
方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division multiplex transmission system for transmitting time division multiplexed call signals, channel selection, and other control signals over the blanking section of a television video signal.
従来この種の時分割デイジタル多重化伝送に
は、第１図に示したような装置構成を有する方式
が採用されていた。即ち、１の電話端末機は、音
声帯域信号あるいは比較的低速のデイジタル信号
を入出力とする様々な端末機を想定したものであ
る。２の端末機インターフエイス部は、１の電話
端末機と後段におかれたパルス符号変復調部
（PCM変復調部）との入出力信号を整合させるた
めのインターフエイスである。３のPCM変調部
は、音声のアナログ入力信号をPCM変調してデ
イジタル化する機能を持つたものである。４の
PCM復調部は、デイジタル化された音声信号を
PCM復調してアナログ化する機能を持つたもの
である。５の交換制御部は、時分割多重化した信
号のチヤネル指定や電話端末機の選択をすること
により、通話路を形成するための処理を行なうも
のである。６の送信部は、時分割多重化した信号
を伝送路に送出するものである。７の受信部は、
伝送路より送られてくる時分割多重化した信号を
受信するものである。８の同期制御部は、多重化
フレームを構成し、そのフレームに同期した制御
信号を発生し、３〜７の各部の動作制御を行なう
ものである。９の中央制御部は、通話路の変更
等、１０の多重化装置全体の制御を行なうもので
ある。 Conventionally, this type of time-division digital multiplexing transmission has adopted a system having an apparatus configuration as shown in FIG. That is, one telephone terminal is assumed to be a variety of terminals that input and output voice band signals or relatively low-speed digital signals. The terminal interface unit 2 is an interface for matching input and output signals between the telephone terminal 1 and a pulse code modulation/demodulation unit (PCM modulation/demodulation unit) placed at the subsequent stage. The PCM modulation section 3 has the function of PCM modulating the audio analog input signal and digitizing it. 4's
The PCM demodulator converts the digitized audio signal into
It has the function of demodulating PCM and converting it to analog. The exchange control section 5 performs processing for forming a communication path by specifying a channel of time-division multiplexed signals and selecting a telephone terminal. The transmitting unit 6 sends out time-division multiplexed signals to the transmission path. The receiving section of 7 is
It receives time-division multiplexed signals sent from a transmission path. A synchronization control section 8 forms a multiplexed frame, generates a control signal synchronized with the frame, and controls the operation of each section 3 to 7. A central control unit 9 controls the entire 10 multiplexing devices, such as changing communication paths.
次に多重化伝送方式で使用されている多重化装
置１０の動作を説明する。即ち、１の電話端末機
の通話信号は、２の端末機インターフエイス部に
よつて適切なレベルで３のPCM変調部に入力さ
れる。そこでアナログ信号からデイジタル信号に
変換され、５の交換制御部に入力される。５の交
換制御部では、デイジタル信号は時分割多重化さ
れ、中央制御部９によつて指定される所定のチヤ
ネルに接続する処理が行なわれる。そして６の送
信部より伝送路に送出される。一方受信側の伝送
路より送られてくる時分割多重化信号は、７の受
信部で受信され、５の交換制御部により多重化さ
れた信号の中から、所定のチヤネルを選択する処
理が行なわれ４のPCM復調部に入力される。更
に４のPCM復調部によつてデイジタル信号から
アナログ信号に変換され、２の端末機インターフ
エイス部により適切なレベルに変換され電話端末
機１に出力される。 Next, the operation of the multiplexer 10 used in the multiplex transmission system will be explained. That is, the speech signal from one telephone terminal is inputted to the PCM modulation section 3 at an appropriate level by the terminal interface section 2. There, the analog signal is converted into a digital signal and input to the exchange control section 5. In the exchange control section 5, the digital signals are time-division multiplexed and processed to be connected to a predetermined channel designated by the central control section 9. The signal is then sent to the transmission path from the transmitting section 6. On the other hand, the time division multiplexed signal sent from the transmission line on the receiving side is received by the receiving section 7, and the switching control section 5 selects a predetermined channel from the multiplexed signals. This signal is input to the PCM demodulation section 4. Furthermore, the digital signal is converted into an analog signal by the PCM demodulation section 4, converted to an appropriate level by the terminal interface section 2, and output to the telephone terminal 1.
しかしながら従来から用いられている時分割多
重化伝送方式においては、独立した専用の伝送路
が必要である。更にテレビ伝送路（TV伝送路）
を利用して伝送するとしても、そのTV伝送路で
使用されていない帯域の搬送周波数で変復調を行
なう周波数分割多重化のような方法を用いなくて
はならなかつた。周波数分割多重化方式は、周波
数帯域の制限があつたり、変復調回路の構成が集
積回路化に適しておらず、コストダウンが望めな
いなどのため、将来性が乏しいという欠点を有し
ていた。また、垂直ブランキング区間を利用した
静止画放送及び文字放送技術（「文字信号送出装
置」ナシヨナルテクニカルレポート、Vol.22、No.
３、JUNE 1978、272−282頁）並びにテレビ電
波の１チヤンネル分の伝送帯域を使用して異なる
番組の静止画及び音声を放送する技術（特開昭56
−123181号公報）も知られている。しかしなが
ら、これらの技法では送信側と受信側の通信装置
相互を交換制御できないという難点がある。 However, in the conventional time division multiplex transmission system, an independent dedicated transmission path is required. Furthermore, TV transmission line (TV transmission line)
Even when transmitting data using a TV channel, it was necessary to use a method such as frequency division multiplexing, which performs modulation and demodulation using a carrier frequency in a band that is not used on the TV transmission path. Frequency division multiplexing has disadvantages such as limited frequency bands, the structure of the modulation/demodulation circuit not being suitable for integration into integrated circuits, and no hope of cost reduction, so that it has little future prospects. In addition, still image broadcasting and text broadcasting technology using vertical blanking sections ("Text signal transmission device", National Technical Report, Vol. 22, No.
3, JUNE 1978, pp. 272-282) and technology for broadcasting still images and audio of different programs using the transmission band of one channel of television radio waves (Japanese Patent Laid-Open No. 56
-123181) is also known. However, these techniques have the disadvantage that they do not allow mutual exchange control between communication devices on the transmitting side and the receiving side.
本発明は上記欠点に鑑みなされたもので、時分
割多重化した通話信号をテレビ映像信号の水平ブ
ランキング区間に、選局その他の各種制御信号を
テレビ映像信号の垂直ブランキング区間にそれぞ
れのせ、水平ブランキング区間のチヤンネルを使
用して一方の局および他方の局の通話信号を交換
処理することにより、通話を行なえるようにした
時分割多重化伝送方式を提供することを目的とす
る。 The present invention has been made in view of the above-mentioned drawbacks, and includes a time-division multiplexed telephone call signal placed on the horizontal blanking period of the television video signal, and various control signals such as channel selection placed on the vertical blanking period of the television video signal. It is an object of the present invention to provide a time division multiplexing transmission system which enables a telephone conversation to be made by exchanging communications signals of one station and the other station using a channel in a horizontal blanking section.
次に第２図に示した本発明の実施例について、
多重化装置２３の構成を説明する。本発明の時分
割多重化伝送方式は、遠く離れて設けられた２箇
所のCATV局の間で、双方向にテレビ信号（TV
信号）を送受信するシステムに適用する場合を想
定している。そこでは各々のCATV局に多数の
通信装置としての電話端末機１１がつながつてい
る。この時分割多重化伝送方式は、次の様な装置
構成でもつて実現される。即ち、一方の局では通
信装置としての電話端末機１１からの入力信号、
いわゆる通話信号を時分割多重化変調する。この
時分割多重化変調は、PCM変調部１３でパルス
符号変調（PCM変調）し、更に交換制御部１５
で時分割多重化することにより得られる。次いで
その信号は、テレビ伝送路（TV伝送路）を介し
て他方の局へ送信される。他方の局では時分割多
重化信号を交換制御部１５で回線分離するととも
に、PCM復調部１４で復調する。その回線分離
復調された通話信号は、電話端末機１１で受信さ
れる。又、この送受信は双方向で行なえるように
なつている。尚本発明の時分割多重化伝送方式の
特徴は次の点にある。即ち、時分割多重化した信
号及び中央制御部１９からの各種制御信号、いわ
ゆる選局その他の制御信号を、TV映像信号の水
平および垂直ブランキング区間にのせ、TV伝送
路を介して伝送することにより送受信を行なえる
ようにしたことにある。次に従来の時分割多重化
伝送方式で用いられる装置構成のうち重複してい
ない部分について説明する。即ち、TV同期信号
再生部２０は、受信信号より受信TV信号を再生
するためのTV同期信号を再生するものである。
多重部２１は、送信TV信号の水平ブランキング
区間にPCM信号を時分割多重する部分で半導体
スイツチにより構成される。TV信号再生部２２
は、受信信号のPCM信号期間（TV信号の水平ブ
ランキングにあたる区間）にTV同期信号再生部
２０で再成されるTV同期信号をのせ、受信TV
信号を再生する部分で、半導体スイツチにより構
成される。 Next, regarding the embodiment of the present invention shown in FIG.
The configuration of the multiplexing device 23 will be explained. The time division multiplex transmission system of the present invention transmits television signals (TV signals) in both directions between two CATV stations located far apart.
It is assumed that the system will be applied to a system that transmits and receives signals (signals). There, a large number of telephone terminals 11 serving as communication devices are connected to each CATV station. This time division multiplex transmission system is realized by the following equipment configuration. That is, at one station, an input signal from the telephone terminal 11 as a communication device,
So-called speech signals are time-division multiplexed and modulated. This time division multiplex modulation is pulse code modulated (PCM modulated) in a PCM modulation section 13, and furthermore, an exchange control section 15
can be obtained by time division multiplexing. The signal is then transmitted to the other station via a television transmission path. At the other station, the time-division multiplexed signal is separated into channels by the exchange control section 15 and demodulated by the PCM demodulation section 14. The telephone terminal 11 receives the line-separated and demodulated speech signal. Further, this transmission and reception can be performed in both directions. The characteristics of the time division multiplex transmission system of the present invention are as follows. That is, time-division multiplexed signals and various control signals from the central control unit 19, so-called channel selection and other control signals, are placed on the horizontal and vertical blanking sections of the TV video signal and transmitted via the TV transmission line. The reason is that it has been made possible to send and receive data using Next, the non-overlapping parts of the device configuration used in the conventional time division multiplex transmission system will be explained. That is, the TV synchronization signal reproducing section 20 reproduces a TV synchronization signal for reproducing the received TV signal from the received signal.
The multiplexing section 21 is a section that time-division multiplexes the PCM signal in the horizontal blanking section of the transmitted TV signal, and is composed of a semiconductor switch. TV signal reproducing section 22
The TV synchronization signal regenerated by the TV synchronization signal reproducing section 20 is placed on the PCM signal period (the period corresponding to the horizontal blanking of the TV signal) of the received signal, and the received TV
This part regenerates signals and is made up of semiconductor switches.
次に第２図に示した本発明の実施例について、
その作用動作を説明する。電話端末機１１の出力
信号は、端末機インターフエイス部１２を経て適
切なレベルに変換され、PCM変調部１３へ入力
される。その信号はPCM変調部１３でアナログ
信号からデイジタル信号に変換され、交換制御部
１５にて時分割多重のチヤネルを指定される。そ
して送信部１６で送信TV信号の水平走査同期帰
線区間（ブランキング区間）にタイミングを合わ
せて多重化する。この時分割多重化信号は、第３
図に示したようにTV映像信号の水平ブランキン
グ区間にのせられる。本発明では８ビツトから成
る音声データを８チヤンネル要している。この音
声データはPCM変調されている。更に同期制御
部１８は、送信TV信号に同期し、PCM変調部１
３、交換制御部１５、送信部１６の動作を同期制
御する。まずPCM変調部１３においては、送信
TV信号の水平走査フレーム周期（もしくはその
整数倍あるいは整数分の１）にてサンプリングを
行い、交換制御部１５においては、水平走査フレ
ーム毎に交換処理を行い、送信部１６において
は、水平走査同期帰線区間に丁度納まる様にタイ
ミングを制御している。またTV信号の垂直走査
同期帰線区間（ブランキング区間）へ多重する信
号は、中央制御部１９より与えられる。垂直走査
同期帰線区間は、約17ｍsec周期という低速の周
期で繰り返すため、中央制御部１９において、マ
イクロプロセツサにより制御可能である。ここ
で、以上説明した、TV映像信号にPCM変調信号
がのつた状態を示すタイムチヤートを第４図に示
す。これは多重部入力送信TV信号の水平ブラン
キング区間に送信PCM信号がのつたことにより、
多重部出力送信信号が得られることを示したもの
である。一方受信信号は、受信TV信号の水平ブ
ランキング区間にPCM信号を時分割多重した信
号として入力され、受信部１７において、水平走
査帰線区間に多重された信号を交換制御部１５
へ、垂直走査帰線区間に多重された信号を中央制
御部１９へ、それぞれ出力する。交換制御部１５
に入力された信号は、中央制御部１９の指定する
チヤネルを通つて所定の経路に入る。そしてその
信号はPCM復調部１４にてアナログ信号に変換
され、端末機インターフエイス部１２をとおつ
て、適切なレベルに変換され電話端末機１１に出
力される。受信TV信号の再生は、PCM信号が入
ることによつて抜きとられた水平ブランキング区
間に同期信号を入れることによつて行なわれる。
（カラーTV信号においてはカラーバースト信号
も再生、挿入する。）この同期信号はTV同期信
号再生部２０で作られ、TV信号再生部２２で元
のTV信号を再生する。以上の実施例では、通信
装置を電話端末機として説明したが、この他のフ
アクシミリ、データターミナル、CRT、プリン
ター、コンピユータ等は垂直ブランキング区間で
送受してもよい。更に実施例では、変復調に
PCMを用いているが、この他にPWM（パルス幅
変調）、PAM（パルス振幅変調）等を適用するこ
とも可能である。 Next, regarding the embodiment of the present invention shown in FIG.
Its function and operation will be explained. The output signal of the telephone terminal 11 is converted to an appropriate level via the terminal interface section 12 and input to the PCM modulation section 13 . The signal is converted from an analog signal to a digital signal by a PCM modulation section 13, and a channel for time division multiplexing is designated by an exchange control section 15. Then, the transmitter 16 multiplexes the signals in synchronization with the horizontal scanning synchronous retrace interval (blanking interval) of the transmitted TV signal. This time division multiplexed signal
As shown in the figure, it is placed on the horizontal blanking section of the TV video signal. The present invention requires 8 channels of audio data consisting of 8 bits. This audio data is PCM modulated. Further, the synchronization control section 18 synchronizes with the transmitted TV signal and controls the PCM modulation section 1.
3. The operations of the exchange control section 15 and the transmission section 16 are synchronously controlled. First, in the PCM modulation section 13, the transmission
Sampling is performed at the horizontal scanning frame period of the TV signal (or an integral multiple or fraction thereof), the exchange control unit 15 performs exchange processing for each horizontal scanning frame, and the transmitting unit 16 performs horizontal scanning synchronization. The timing is controlled to fit exactly within the retrace section. Further, a signal to be multiplexed to the vertical scanning synchronized retrace section (blanking section) of the TV signal is given by the central control section 19. Since the vertical scanning synchronous flyback section repeats at a low speed of about 17 msec, it can be controlled by a microprocessor in the central control section 19. Here, FIG. 4 shows a time chart showing the state in which the PCM modulation signal is added to the TV video signal as described above. This is because the transmitted PCM signal is placed in the horizontal blanking section of the transmitted TV signal input to the multiplexer.
This shows that a multiplexer output transmission signal can be obtained. On the other hand, the received signal is input as a signal obtained by time-division multiplexing a PCM signal in the horizontal blanking section of the received TV signal, and in the receiving section 17, the signal multiplexed in the horizontal scanning retrace section is sent to the exchange control section 15.
, the signals multiplexed in the vertical scanning blanking section are output to the central control section 19, respectively. Exchange control unit 15
The signal input to the central control unit 19 enters a predetermined route through a channel designated by the central control unit 19 . The signal is then converted into an analog signal by the PCM demodulation section 14, passed through the terminal interface section 12, converted to an appropriate level, and output to the telephone terminal 11. Reproduction of the received TV signal is performed by inserting a synchronization signal into the horizontal blanking section that has been removed by the introduction of the PCM signal.
(A color burst signal is also reproduced and inserted in a color TV signal.) This synchronization signal is generated by a TV synchronization signal reproduction section 20, and a TV signal reproduction section 22 reproduces the original TV signal. In the above embodiments, the communication device is described as a telephone terminal, but other devices such as a facsimile, data terminal, CRT, printer, computer, etc. may be used for transmission and reception in the vertical blanking section. Furthermore, in the embodiment, the modulation/demodulation
Although PCM is used, it is also possible to apply other methods such as PWM (pulse width modulation) and PAM (pulse amplitude modulation).
本発明は、既存のTV伝送路を利用して、その
TV信号の水平ブランキング区間にPCM信号を時
分割多重化し、一方の局および他方の局の通信装
置相互をテレビ伝送路の水平ブランキング区間の
時分割多重化されたチヤンネルで交換処理する構
成としたため、通話専用の伝送路を設ける必要が
ない。またTV伝送路において、使用されていな
い周波数帯域を用いた周波数分割多重伝送方式と
異なり、構成回路の殆んどを、デイジタル半導体
集積回路で実現できるため、コストダウン及び信
頼性が期待できるという効果を奏する。 The present invention utilizes existing TV transmission channels to
The PCM signal is time-division multiplexed in the horizontal blanking section of the TV signal, and the communication devices of one station and the other station are exchanged using the time-division multiplexed channel in the horizontal blanking section of the TV transmission path. Therefore, there is no need to provide a transmission line exclusively for telephone calls. In addition, unlike frequency division multiplexing transmission systems that use unused frequency bands in TV transmission lines, most of the component circuits can be realized with digital semiconductor integrated circuits, which has the effect of reducing costs and reducing reliability. play.
第１図は従来の時分割多重化伝送方式を実現す
るための多重化装置の構成を示すブロツク図、第
２図は本発明の時分割多重化伝送方式を実現する
ための多重化装置の構成を示すブロツク図、第３
図は多重化フレームを示したタイムチヤート、第
４図はTV映像信号にPCM変調信号がのつた状態
を示すタイムチヤートである。
１１……電話端末機（通信装置）、２３，２３
……一方の局、他方の局。
FIG. 1 is a block diagram showing the configuration of a multiplexing device for realizing the conventional time division multiplexing transmission system, and FIG. 2 is a block diagram showing the configuration of the multiplexing device for realizing the time division multiplexing transmission system of the present invention. Block diagram showing 3rd
The figure is a time chart showing a multiplexed frame, and FIG. 4 is a time chart showing a state in which a PCM modulation signal is added to a TV video signal. 11...Telephone terminal (communication device), 23, 23
...One station, the other station.
Claims (1)
多重化変調し、次いでその信号を伝送路を介して
他方の局へ送信し、そこで前記時分割多重化した
信号を回線分離復調し、その信号を通信装置で受
信し、この送受信を双方向で行なえるようにした
時分割多重化伝送方式において、前記時分割多重
化した通話信号をテレビ映像信号の水平ブランキ
ング区間に、選局その他の各種制御信号を前記テ
レビ映像信号の垂直ブランキング区間にそれぞれ
のせ、前記水平ブランキング区間のチヤンネルを
使用して前記一方の局および他方の局の前記通話
信号を交換処理することにより、送受信を行なえ
るようにしたことを特徴とする時分割多重化伝送
方式。1 One station time-division multiplex modulates the speech signal from the communication device, then transmits the signal to the other station via a transmission path, where the time-division multiplexed signal is line-separated and demodulated, and then In a time division multiplex transmission system in which a signal is received by a communication device and this transmission and reception can be performed in both directions, the time division multiplexed call signal is used for channel selection and other purposes in the horizontal blanking section of the television video signal. Transmission and reception can be performed by placing various control signals on the vertical blanking sections of the television video signal, and exchanging the call signals of the one station and the other station using the channel of the horizontal blanking section. A time division multiplexing transmission system characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040483A JPS59135983A (en) | 1983-01-24 | 1983-01-24 | Time division multiplex transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040483A JPS59135983A (en) | 1983-01-24 | 1983-01-24 | Time division multiplex transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59135983A JPS59135983A (en) | 1984-08-04 |
| JPH0213878B2 true JPH0213878B2 (en) | 1990-04-05 |
Family
ID=11749196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1040483A Granted JPS59135983A (en) | 1983-01-24 | 1983-01-24 | Time division multiplex transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59135983A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0783322B2 (en) * | 1988-02-29 | 1995-09-06 | 株式会社富士通ゼネラル | Video and audio signals multiplexed transmission and playback system |
| JP3371290B2 (en) * | 1995-01-30 | 2003-01-27 | ソニー株式会社 | Data transmission device, data transmission method, and video camera system using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361211A (en) * | 1976-11-13 | 1978-06-01 | Fujitsu Ltd | Multiplication device |
| JPS56123181A (en) * | 1980-03-04 | 1981-09-28 | Matsushita Electric Ind Co Ltd | Still picture transmission system |
-
1983
- 1983-01-24 JP JP1040483A patent/JPS59135983A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361211A (en) * | 1976-11-13 | 1978-06-01 | Fujitsu Ltd | Multiplication device |
| JPS56123181A (en) * | 1980-03-04 | 1981-09-28 | Matsushita Electric Ind Co Ltd | Still picture transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59135983A (en) | 1984-08-04 |
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