JPS59231934A - Two-way communication system - Google Patents
Two-way communication systemInfo
- Publication number
- JPS59231934A JPS59231934A JP10690683A JP10690683A JPS59231934A JP S59231934 A JPS59231934 A JP S59231934A JP 10690683 A JP10690683 A JP 10690683A JP 10690683 A JP10690683 A JP 10690683A JP S59231934 A JPS59231934 A JP S59231934A
- Authority
- JP
- Japan
- Prior art keywords
- wave number
- frequency
- signal
- same wave
- converted
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/36—Repeater circuits
- H04B3/38—Repeater circuits for signals in two different frequency ranges transmitted in opposite directions over the same transmission path
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、同軸ケーブル分岐分配システムに、周波数変
換コシバータを同軸ケーづルのヘッドエンドに設置した
双方向多重通信システムの双方向通信方式に関するもの
である。[Detailed Description of the Invention] [Technical Field] The present invention relates to a two-way communication system for a two-way multiplex communication system in which a frequency conversion converter is installed at the head end of a coaxial cable in a coaxial cable branching and distribution system. .
＠１図は、フシバータを同軸ケーブルの端部（へ・シド
エシド）に備えた双方向多重通信システムの一例を示す
ものである。図中（ｔｌ ｌｄ 同波数変換の機能を有
するコシバータ、（２）け同軸ケーづルで、この同軸ケ
ーブル（２）の途中の適宜な場所に複数の分岐器（３）
を挿入接続しである。（４Ａ）（４Ｂ）・・・は各分岐
器（３）の−唱に接続され逢端末機である。前記コシバ
ータ（１）は同軸ケーブル（２）の端部に設けられてい
る。このシステムにおいて端末機（４Ａ）とイ也の端末
１機（４Ｂ）との間で双方向多重通信を行なう。この場
合の通信はデータ伝送、音声、映像伝送のことである。Figure @1 shows an example of a two-way multiplex communication system in which a Fushiverter is provided at the end of a coaxial cable. In the figure (tl ld) A coaxial cable with a coaxial cable (2) that has the same wave number conversion function, and multiple branchers (3) installed at appropriate locations along the coaxial cable (2).
Insert and connect. (4A), (4B), . . . are terminals connected to the terminals of each branch (3). The coaxial cable (1) is provided at the end of the coaxial cable (2). In this system, bidirectional multiplex communication is performed between a terminal (4A) and one terminal (4B) of Iya. Communication in this case refers to data transmission, audio, and video transmission.
ここで、端末機（４Ａ）から同波数ｆＡなる信号を送出
する。また他の端末機（４Ｂ）からは信号同波数ｆＡと
け異な、る、信号局波数ｆＢなる信号を送出する。信号
局波数ｆＡＦｉコシバータｆｉ＋により同波数ＦＡに変
換され、信５ｊ８波数ｆＢは同波数ＦＢ・に変換される
。同波数配置の一例を第２図に示す。こう倍信号と送信
信号の分離を容易にすることができる６また、送信信号
をそのままヘッドエンドカ属ら送出すると、信号の時間
差による合成等により、例えば映像信号の５−スト等の
悪影響がある。しｆｃ−７’ｌＥつて、分岐分配方式で
はコンバータ１１）を用いた双方向通信方式が用いられ
る。しかしながら、この方式の欠点として、送信同波数
を受信信号の局部発振局波数に利用することができない
という重大な欠点がある。つまり、本システムでは送信
信号の発振回路とは別に受信信号の受信のための局部発
振回路を備えなければ双方向同時通信を行なうこ七がで
きないという問題があった。Here, a signal having the same wave number fA is sent from the terminal (4A). Further, from another terminal (4B), a signal having a signal station wave number fB, which is different from the signal same wave number fA, is sent out. The signal station wave number fAFi is converted into the same wave number FA by the cosciverter fi+, and the signal 5j8 wave number fB is converted into the same wave number FB. An example of the same wave number arrangement is shown in FIG. It is possible to easily separate the multiplied signal and the transmitted signal.6 In addition, if the transmitted signal is sent out from the head end unit as it is, there will be adverse effects such as 5-stroke of the video signal due to synthesis due to the time difference of the signals. . In the branch distribution method, a bidirectional communication method using a converter 11) is used. However, this method has a serious drawback in that the same transmission wave number cannot be used as the local oscillation frequency of the received signal. In other words, this system has a problem in that simultaneous bidirectional communication cannot be performed unless a local oscillation circuit for receiving the reception signal is provided in addition to the oscillation circuit for the transmission signal.
未発明は上述の点に鑑みて提供したものであって、ヘッ
ドエンドにコンバータを有する分岐分配双方向通信シス
テムにおける端末機間通信のための回路の簡素化を目的
とした双方向通信方式を提供するものである。The present invention has been provided in view of the above-mentioned points, and provides a two-way communication method for the purpose of simplifying a circuit for communication between terminals in a branch distribution two-way communication system having a converter at the head end. It is something to do.
以下、本発明の実施例を図面により詳述する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
尚、基本的な方式及び構成は従来と同様である。Note that the basic method and configuration are the same as the conventional one.
第３図はコーＪバータｔ１）のづロック図を示し、（６
）は分波混合器、（８）は］ｙｔｓ−タ（１）内部の同
波数ｐｏを発振す名局部発振回路、ｆＹｌ ｔｒｉ ８
波数変換回路で、分波混合器（５）からの送出信号同波
数ｆｌ 、 ｆＢと、局部発振局ｗ！ｒ（８１からの局
部発振局波数Ｆｏとを混合して同波数ＦＡ、ＦＢＫ間波
数変換するものである。ここで、ＦＡ＝ Ｆｏ ＋ ｆ
ｌ 、 Ｆｎ ＝＝ Ｆｏ ＋ｆＢの関係を有している
。ｆ６ｔ Ｆｉ混合器で、周波数変換面＠ ｆ７１から
の変換されｆＣ同波数ＦＡＩＦＢと局部発振回路（８）
からの局部発振局波数ＦＯとを混合して、同波数ＦＡＩ
Ｆ ｎ ＋ Ｆ ｏを夫々出力する。（９）は外部接続
端子である。ここで、外部接続端子（９）より端末機（
４ＡＯ又は４Ｂ）より送出信号同波数ｆｈ （ｆＢ ）
を受信すると、送出信５ｊ８波数ｆｈ （ｆＢ）は分波
混合器（５）を介して同波数変換回路（７）に入力され
、局部発振局９ＩＦ＋８１からの局部発振同波数ＦＯに
よシー波数変換回路（７）において同波数ＦＡ ＝ Ｆ
ｏ ＋ｆｈ （ＦＢ ＝ Ｆｏ ＋ｆｓ ）に変換され
る。さらに、混合器（６）でＦｉ同波数ＦＡ 、 Ｆ。Figure 3 shows the co-Jverter t1) nozulock diagram, and (6
) is a branching mixer, (8) is a famous local oscillation circuit that oscillates the same wave number po inside the yts-taper (1), fYl tri 8
In the wave number conversion circuit, the same wave numbers fl and fB of the output signals from the demultiplexing mixer (5) and the local oscillation station w! r (81) is mixed with the local oscillation station wave number Fo to perform wave number conversion between the same wave numbers FA and FBK. Here, FA = Fo + f
l, Fn == Fo + fB. f6t Fi mixer, frequency conversion surface @ converted from f71 fC same wave number FAIFB and local oscillation circuit (8)
The same wave number FAI is obtained by mixing the local oscillator wave number FO from
Output F n + F o, respectively. (9) is an external connection terminal. Here, connect the external connection terminal (9) to the terminal (
4AO or 4B), the same wave number fh (fB) of the transmitted signal
When the transmitted 5j8 wave number fh (fB) is input to the iso-wave number conversion circuit (7) via the demultiplexing mixer (5), it is converted to a sea-wave number by the local oscillation iso-wave number FO from the local oscillation station 9IF+81. In circuit (7), the same wave number FA = F
o + fh (FB = Fo + fs). Furthermore, in the mixer (6), Fi is the same wave number FA, F.
（Ｆ ｎ ｓ Ｆ ｏ ）が出力され、分波混合器（５
）および外部接続端子（９）から同波数ＦＡ、Ｆｏ（Ｆ
ｎ、Ｆｏ）が送出される。そして、同軸ケーづル１２）
、分岐器（３）を介して端末機（４Ｂ）（又け４Ａ）に
伝送される。このように、コンバータｆｉ＋は、端末機
（４Ａ）（４Ｂ）から送出された信号を受信し、同波数
変換して再送出するとともに、同波数変換するときに用
いる局部発振同波数ＦＯを送出するものである〇
第４図は信号同波数ｆＡの信号を送出し、信号筒。(F n s F o ) is output, and the demultiplexer (5
) and external connection terminal (9) to the same wave number FA, Fo (F
n, Fo) are sent. And coaxial cable 12)
, is transmitted to the terminal (4B) (straddle 4A) via the branch (3). In this way, the converter fi+ receives the signals sent out from the terminals (4A) (4B), converts the same wave number, and retransmits it, and also sends out the local oscillation same wave number FO used when performing the same wave number conversion. Figure 4 shows a signal tube that sends out a signal with the same wave number fA.
波数ｆＢの信号を受信する端末機（４Ａ）のプロツク豚
である。（ｌＯ）は外部接続端子、ｆｌｌ＋は変調信号
入力端子、ＩＩＪは復調信号出力端子である。ｆ１３１
は分波混合器、（１４１は同波数ｆＡを発振出力する発
振回路である。（！０は変調回路、ｆｌｌｌＦｉＩＪウ
シコンバータ回路、（１７１け混合回路、（１区は復調
回路である。しかして、発振局＠ｆ１４でｆＡなる同波
数を発振し、混合回路ｆ１７１および変調回路（国へ送
出する。変調口＠ （ｌ荀においては周波数ｆＡが変調
信号入力端子屯１より入力した変調信号により変調（Ａ
Ｍ、ＦＭ等）され、信号局波数ｆＡとして分波混合器ｉ
１３に送出される。分波混合器１１鶏で受けた信号同波
数ｆＡけ外部接′ｆＩｔ端子（ｌＯ）を介して、送出信
号同波数ｆｈとして分岐分配システムに送出される。ま
た、外部接続端子（１０）でコンバータ１ｌｌｈらの信
号を受信した同波数ＦＡ ＊ Ｆｎ 、Ｆ□け分波混合
器（１尋を介してタウンコンバータ回路ｆ＋６１に伝達
される。タウンコンバータ回路（１６）でＦｉＦ。This is a terminal (4A) block that receives a signal with wave number fB. (lO) is an external connection terminal, fll+ is a modulation signal input terminal, and IIJ is a demodulation signal output terminal. f131
is a demultiplexing mixer, (141 is an oscillation circuit that oscillates and outputs the same wave number fA. , the oscillation station @ f14 oscillates the same wave number fA, and sends it to the mixing circuit f171 and the modulation circuit (country). (A
M, FM, etc.), and the signal station wave number fA is set as the branching mixer i.
Sent on 13th. The signal received by the demultiplexing mixer 11 with the same wave number fA is sent to the branch distribution system as the output signal with the same wave number fh via the external connection terminal (lO). In addition, signals from the converter 1llh etc. are received at the external connection terminal (10) and transmitted to the town converter circuit f+61 via the same wave number FA*Fn, F□ division mixer (1 fathom).The town converter circuit (16 ) in FiF.
を局部発振同波数として、同波数ＦＡ ＊ ＦＢを信号
同波数／Ａ （：ＦＡ−ＦＯ）、 ｆｎ （＝＝ＦＢ−
Ｆｏ ） Ｋ問１ 波数変換する。そして、信号同波
数ｆＡ、ｆｎを混１ 金回路９加３漣する。混合回路
ｌＩηでは発振回路１１４）の発振回ｔｉｒｌｆ−ｆＡ
を局部発振局波数として、信号同波数ｆＡ 、 ｆＢ
を同波数変換し、中間周波数１ｆＡ−ｆＢｌをとり出
す。ｌ ｆＡ−ｆＢ ｌの信号は復調回路（１〜で復調
され、復調信号出力端子（１２１よシ復調出力としてと
りだされる。つまり、端末ｌ１ｌ（４Ａ）の機能として
は、ｆＡの同波数で変調された信号同波数を送出すると
ともに、コンバータｆｉ＋からの周波数ＦＢの信号を復
調するために、ヘッドエンドから送出された〕ンバータ
ｉｌｌ内の局部発振局波数を端末機（４Ａ）の局部発振
局波数として、同波数ＦＢを端末機（４Ｂ）から送出さ
れた信号量波数ｆＥＫ問波数変換し、更に、信号同波数
ｆＢを端末機（４Ａ）の送＠問波敦ｆｈを局部発振局波
数として、中間同波数に同波数変換し、復調するもので
ある。is the same wave number of local oscillation, and the same wave number FA * FB is the signal same wave number/A (:FA-FO), fn (==FB-
Fo ) K Question 1 Perform wave number conversion. Then, the signals fA and fn having the same wave numbers are sent to a mixed metal circuit 9 and 3. In the mixing circuit lIη, the oscillation circuit tirlf-fA of the oscillation circuit 114)
As the local oscillation station wave number, the signal same wave numbers fA, fB
is subjected to the same wave number conversion and the intermediate frequency 1fA-fBl is extracted. l fA-fB The signal of l is demodulated by the demodulation circuit (1~) and taken out as the demodulated output from the demodulated signal output terminal (121).In other words, the function of the terminal l1l (4A) is to In order to transmit the same wave number of the modulated signal and demodulate the signal of frequency FB from the converter fi+, the local oscillation frequency in the inverter ill sent from the head end is transmitted to the local oscillation station of the terminal (4A). As a wave number, the same wave number FB is converted to the signal amount wave number fEK sent from the terminal (4B), and further, the signal same wave number fB is converted to the signal amount wave number fH sent by the terminal (4A) as the local oscillation station wave number. , converts the same wave number to an intermediate same wave number, and demodulates it.
第５図は、端末機（４Ａ）と（４Ｂ）、コンバータｆｌ
＋との関係において、それぞれの送信部波数が受信され
て中間同波数まで変換されるのを示すブロック図である
。端末機（４Ａ）の発振回ＦＮｔ（１４Ａ）で発生１
した同波数ｆＡを変調回Ｆｊｌｒ（１５Ａ）で変調
し、コンバータ＋１１に伝送する。コンバータ（１）で
は局部発振局波数ＦｏによってｆＡをＦＡに変換して送
出する。またコンバータｉｌｌけ局部発振同波数ＦＯも
送出する。Figure 5 shows terminals (4A) and (4B), converter fl
FIG. 2 is a block diagram showing how each transmitter wave number is received and converted to an intermediate same wave number in relation to +. Occurrence 1 at the oscillation time FNt (14A) of the terminal (4A)
The same wave number fA obtained is modulated by a modulation circuit Fjlr (15A) and transmitted to converter +11. The converter (1) converts fA into FA using the local oscillation frequency Fo and sends it out. The converter ill also sends out local oscillation of the same wave number FO.
端末機（４Ｂ）ではダウフ〕フバータ回路（国にて周波
数ＦＡを局部発振局波数ＦＯにより、信号同波数ｆＡに
変換し、信号同波数ｆＡは混合回路０７１で喘末＠（４
Ｂ）の発振回Ｆｊｌｒ（１４Ｂ）で発振しｆｃ間同波ｆ
Ｂで中間局波数ｆＩＦ ＝ ｌ ｆＡ−ｆＢｌに変換す
る。In the terminal (4B), the frequency FA is converted into the signal same wave number fA by the Dauf] Fuverter circuit (in the country) by the local oscillation station wave number FO, and the signal same wave number fA is converted to the signal same wave number fA by the mixing circuit 071.
B) oscillates at the oscillation time Fjlr (14B) and the same wave f between fc
The intermediate station wave number fIF = l fA - fBl is converted at B.
本発明は上述のように双方向通信方式において、相手側
の端末機より伝送された送出信号同波数をコンバータに
てコンバータ内部の局部発振同波数と混合して同波数変
換し、この変換されｆｃ信号周波数とコンバータの局部
発振周波数とを同軸ケーづル及び分岐器を介して受信し
、この受信したコンバータの局部発振局波数を自局の局
部発振同波数として変換された信号同波数と混合して相
手側の送出信号同波数に再変換し、再変換された相手側
の送出信号同波数と自局の送出信号同波数とを混合して
中間周波数に変換し、該中間同波数を復調するようにし
たものであるから、コンバータの局部発振同波数を端末
製画へ送出し、該端末機Ｃすては受信同波数をコンバー
タの局部発振同波数で相手側の端末機の送出信号同波数
に再変換し、自局の端末機の送出信号同波数を局部発振
局波数として中間局波数に変換することにより、端末機
の発振回路が送出信号同波数だけでよく、従来のように
別個に局部発振回路を設ける必要がなく、回路の簡略化
、コストの低減を図るこ七ができる効果を奏する。また
、多局化としてＰＬＬ回路を採用した場合、ＰＬＬ回路
が局部発振回路と送信同波数発生用に兼用できるもので
ある。As described above, in the two-way communication system, the present invention converts the same wave number of the output signal transmitted from the terminal on the other end by mixing it with the same wave number of the local oscillation inside the converter in the converter, The signal frequency and the local oscillation frequency of the converter are received via a coaxial cable and a brancher, and the received local oscillation frequency of the converter is mixed with the converted signal same frequency as the local oscillation frequency of the own station. The reconverted transmission signal of the other party's transmission signal with the same wave number is mixed with the same wave number of the transmission signal of the local station, which is then converted to an intermediate frequency, and the intermediate frequency is demodulated. Therefore, the local oscillation frequency of the converter is sent to the terminal device, and the terminal device C converts the reception frequency to the local oscillation frequency of the converter and the transmission signal frequency of the other terminal. By reconverting the same wave number of the sending signal of the own terminal to the intermediate station wave number as the local oscillation station wave number, the oscillation circuit of the terminal only needs to use the same wave number of the sending signal, and it can be used separately as in the past. There is no need to provide a local oscillation circuit, and the advantage is that the circuit can be simplified and costs can be reduced. Furthermore, when a PLL circuit is adopted for multi-stationing, the PLL circuit can be used both as a local oscillation circuit and for generating the same wave number for transmission.
第１図は双方向多重通信システムのブロック図、第２図
は同上の同波数配置図、第３図は本発明の実施例のコン
バータのづロック図、＠４図は同上の端末機のづＤ・リ
フ図、第５図は同との同波数変換の経路を示すブロック
図である。
＋１１はコンバータ、（２）は同軸ケーづル、（３）は
分岐器、（４）は端末機、ｆＡｆｓは送出信号同波数、
Ｆ。
は局部発振局波数、ＦＡ ＦＢは変換された同波数を示
す。Fig. 1 is a block diagram of a two-way multiplex communication system, Fig. 2 is a wave number arrangement diagram of the same as above, Fig. 3 is a lock diagram of a converter according to an embodiment of the present invention, and Fig. 4 is a diagram of a terminal equipment as above. D. Riff diagram, FIG. 5 is a block diagram showing the same wave number conversion path. +11 is the converter, (2) is the coaxial cable, (3) is the branch, (4) is the terminal, fAfs is the same wave number of the sending signal,
F. is the local oscillation station wave number, and FA FB is the converted same wave number.
Claims (1)
端末機を夫々接続すると共に、該同軸ケーづルの端部に
コシバータを設け、各端末機より同軸ケーづルを介して
伝送された相異なる信号局波数をコシバータにて周波数
変換し、同軸ケーブルおよび分岐器を介して同波数変換
された信号同波数を各端末機で再変換し、コシバータを
介して各端末機間で双方向通信を行なうようにした双方
向通信方式において、相手側の端末機より伝送された送
出信号局波数をコシバータにてコンバータ内部の局部発
振同波数と混合して同波数変換し、この変換された信号
局波数とコシバータの局部発振同波数とを同軸ケーづル
及び分岐器を介して受信し、この受信したつシバータの
局部発振局波数を自局の局部発振局波数として変換され
た信号同波数と混合して相手側の送出信８間波数に再変
換し、再変換された相手側の送出信号同波数と自局の送
出信号同波数とを混合して中間同波数に変換し、該中間
同波数を復調することを特徴とする双方向通信方式。Each terminal is connected to a plurality of branching switches provided in the middle of the 111 coaxial cable, and a converter is provided at the end of the coaxial cable, so that the phase transmitted from each terminal via the coaxial cable is Different signal station wave numbers are frequency-converted by a cosivater, and the same wave number converted signals are reconverted at each terminal via a coaxial cable and a brancher, and bidirectional communication is established between each terminal via the cosivater. In the two-way communication method, the transmitting signal station wave number transmitted from the other party's terminal is mixed with the local oscillation same wave number inside the converter in a converter and converted into the same wave number, and the converted signal station wave number is converted into the same wave number. and the same frequency of the local oscillation of the shivater via a coaxial cable and a brancher, and mixes the received local oscillation frequency of the shivater with the converted signal same frequency as the local oscillation frequency of its own station. The reconverted same wave number of the transmitted signal of the other side is mixed with the same wave number of the transmitted signal of the own station, and converted to an intermediate same wave number, and the intermediate same wave number is mixed. A two-way communication method characterized by demodulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10690683A JPS59231934A (en) | 1983-06-15 | 1983-06-15 | Two-way communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10690683A JPS59231934A (en) | 1983-06-15 | 1983-06-15 | Two-way communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59231934A true JPS59231934A (en) | 1984-12-26 |
| JPH023334B2 JPH023334B2 (en) | 1990-01-23 |
Family
ID=14445491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10690683A Granted JPS59231934A (en) | 1983-06-15 | 1983-06-15 | Two-way communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59231934A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997018642A1 (en) * | 1995-11-14 | 1997-05-22 | Allen Telecom Inc. | Bi-directional amplifiers and signal channels for frequency division duplex communications |
-
1983
- 1983-06-15 JP JP10690683A patent/JPS59231934A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997018642A1 (en) * | 1995-11-14 | 1997-05-22 | Allen Telecom Inc. | Bi-directional amplifiers and signal channels for frequency division duplex communications |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH023334B2 (en) | 1990-01-23 |
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