JP2002076803A - Two-way amplifier - Google Patents
Two-way amplifierInfo
- Publication number
- JP2002076803A JP2002076803A JP2000255902A JP2000255902A JP2002076803A JP 2002076803 A JP2002076803 A JP 2002076803A JP 2000255902 A JP2000255902 A JP 2000255902A JP 2000255902 A JP2000255902 A JP 2000255902A JP 2002076803 A JP2002076803 A JP 2002076803A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- output
- upstream
- amplifier
- signal
- 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
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Amplifiers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、双方向ＣＡＴＶシ
ステムの信号伝送路の途中に介在させて信号を増幅する
双方向増幅器に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a bidirectional amplifier for amplifying a signal by being interposed in a signal transmission line of a bidirectional CATV system.
【０００２】[0002]
【従来の技術】ケーブルテレビ網を利用して双方向通信
を可能とした双方向ＣＡＴＶシステムでは、加入者側で
発生する雑音信号が上り回線を介してセンター局に流れ
込む、いわゆる流合雑音が問題となっている。特に、双
方向増幅器を有する場合、その出力側である加入者宅側
が開放状態にあると大きな上り雑音が発生すると共に更
にその雑音を増幅することになるため、その様な場合に
上り雑音をカット或いは削減する工夫が検討されてい
る。例えば、特開平１０−２０９７７５号公報に記載さ
れた双方向増幅器では、図３の回路ブロック図に示すよ
うに、２つの下り信号出力／上り信号入力端子２０，２
１を設け、一方を下り専用とした場合、その下り専用と
した端子２１に、選択操作子２２の操作に応じて信号経
路にフィルタ２３を介挿させて、流合雑音の原因となる
上り信号周波数帯域のノイズの侵入を遮断して流合雑音
を削減する構成が示されている。2. Description of the Related Art In a two-way CATV system capable of two-way communication using a cable television network, there is a problem of so-called ingress noise in which a noise signal generated on the subscriber side flows into a center station via an uplink. It has become. In particular, when a bidirectional amplifier is provided, if the output side of the subscriber's home is in an open state, a large uplink noise is generated and the noise is further amplified. In such a case, the uplink noise is cut. Alternatively, measures to reduce the amount are being studied. For example, in the bidirectional amplifier described in Japanese Patent Application Laid-Open No. H10-209775, as shown in the circuit block diagram of FIG.
1 is provided, and one is dedicated to downlink. The filter 21 is inserted into the signal path according to the operation of the selection operation element 22 at the terminal 21 dedicated to downlink, so that the upstream signal causing ingress noise is generated. A configuration for blocking intrusion of noise in a frequency band to reduce ingress noise is shown.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記特開平１０
−２０９７７５号公報に記載の技術は、複数の下り信号
出力／上り信号入力端子を設ける際に分配器２４を使用
しているため、そこで上り信号が大きく減衰するため、
場合によっては上り信号増幅器の追加を必要としてい
た。そこで、本発明はこのような問題点に鑑み、端末側
端子が開放されても流合雑音の原因となる雑音の流入が
大きくならず、また上り信号の減衰量が小さい双方向増
幅器を提供することを課題とする。However, Japanese Patent Application Laid-Open No.
According to the technology described in JP-A-209775, the distributor 24 is used when a plurality of downstream signal output / upstream signal input terminals are provided.
In some cases, it was necessary to add an upstream signal amplifier. In view of the above, the present invention provides a bidirectional amplifier in which the inflow of noise causing ingress noise does not increase even when the terminal on the terminal side is opened, and the amount of attenuation of the upstream signal is small. That is the task.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、請求項１の発明は、下り信号を入力する入力端子と
その信号を出力する第１及び第２の出力端子を有し、下
り増幅回路と、各出力端子から入来する上り信号を増幅
する上り増幅回路とを有する双方向増幅器であって、第
２出力端子は下り増幅回路出力に分岐手段を設け、その
分岐出力を更に第２出力端子から入来する上り信号を分
離する分離手段を介して下り信号を出力すると共に、該
分離手段で分離された上り信号を第１切換手段を介して
上り増幅回路の入力部に接続し、第１出力端子は前記分
岐手段の出力部に接続して下り信号を出力すると共に、
第１出力端子から入来する上り信号を第２切換手段を介
して上り増幅器の入力部に接続して成ることを特徴とす
る。In order to solve the above-mentioned problems, a first aspect of the present invention has an input terminal for inputting a downstream signal, and first and second output terminals for outputting the signal. A bidirectional amplifier having a circuit and an upstream amplifying circuit for amplifying an upstream signal coming from each output terminal, wherein a second output terminal is provided with a branching means at an output of the downstream amplifying circuit, and the branch output is further connected to a second output terminal. Outputting a downstream signal through a separating unit that separates an upstream signal coming from an output terminal, and connecting the upstream signal separated by the separating unit to an input unit of the upstream amplifier circuit through a first switching unit; The first output terminal is connected to the output unit of the branching unit to output a downstream signal,
The upstream signal coming from the first output terminal is connected to the input of the upstream amplifier via the second switching means.
【０００５】請求項２の発明は、請求項１の発明におい
て、分離手段が分岐器であって、該分岐器の入力端子を
第２出力端子に接続し、分岐端子を分岐手段の分岐出力
部に接続し、更に分岐器の出力端子を第１切換手段を介
して上り増幅回路の入力部に接続して成ることを特徴と
する。According to a second aspect of the present invention, in the first aspect of the present invention, the separating means is a branching device, the input terminal of the branching device is connected to the second output terminal, and the branching terminal is connected to the branching output section of the branching device. And the output terminal of the branching device is connected to the input of the upstream amplifier circuit via the first switching means.
【０００６】請求項３の発明は、請求項１または２の発
明において、第１切換手段と第２切換手段が連動し、第
１出力端子か第２出力端子の何れか一方の信号線が上り
増幅器に接続されることを特徴とする。According to a third aspect of the present invention, in the first or second aspect of the present invention, the first switching means and the second switching means are interlocked, and one of the first output terminal and the second output terminal rises. It is characterized by being connected to an amplifier.
【０００７】[0007]
【発明の実施の形態】以下、本発明を具体化した実施の
形態を、図面に基づいて詳細に説明する。図１は本発明
に係る双方向増幅器の１例を示す回路ブロック図であ
り、１はＣＡＴＶ幹線側伝送路に接続する入力端子、
２，３は何れも加入者宅の端末機器を接続する出力端子
であり、そのうち２はＣＡＴＶ機器を接続するＣＡＴＶ
端子、３はパーソナルコンピュータ等の通信機器を接続
する通信端子である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an example of a bidirectional amplifier according to the present invention, in which 1 is an input terminal connected to a CATV main transmission line,
Reference numerals 2 and 3 denote output terminals for connecting terminal equipment at the subscriber's home, and 2 of them is a CATV for connecting CATV equipment.
Terminals 3 are communication terminals for connecting communication equipment such as a personal computer.
【０００８】入力端子１とＣＡＴＶ端子２の間は入力側
信号分離回路４により下り信号回路６ａと上り信号回路
６ｂとに分離され、下り信号回路６ａには下り増幅回路
７が設けられ、更にその出力側に通信端子３に信号を分
岐する信号分岐手段として第１分岐器８が設けられ、そ
の出力線が出力側信号分離回路５を介してＣＡＴＶ端子
２に接続されている。尚、信号分離回路はハイパスフィ
ルタとローパスフィルタを組み合わせて形成され、例え
ば下り信号周波数７０ＭＨｚ〜７７０ＭＨｚと上り周波
数１０ＭＨｚ〜５５ＭＨｚを分離している。また、上り
信号回路６ｂは上り増幅回路１０を有し、出力側信号分
離回路５で分離された上り信号を第１切換手段１１ａを
介して入力し、増幅した出力信号を入力側信号分離回路
４を介して入力端子１から出力している。The input terminal 1 and the CATV terminal 2 are separated into a downstream signal circuit 6a and an upstream signal circuit 6b by an input-side signal separation circuit 4, and a downstream amplifier circuit 7 is provided in the downstream signal circuit 6a. A first splitter 8 is provided on the output side as a signal splitting unit for splitting a signal to the communication terminal 3, and an output line thereof is connected to the CATV terminal 2 via an output side signal separation circuit 5. The signal separation circuit is formed by combining a high-pass filter and a low-pass filter, and separates, for example, a downstream signal frequency of 70 MHz to 770 MHz and an upstream frequency of 10 MHz to 55 MHz. The upstream signal circuit 6b has an upstream amplifier circuit 10, inputs the upstream signal separated by the output-side signal separation circuit 5 through the first switching means 11a, and outputs the amplified output signal to the input-side signal separation circuit 4. Is output from the input terminal 1 via the.
【０００９】通信端子３は第１分岐器８、そして分離手
段としての第２分岐器１３を介して接続されている。詳
しく述べると、まず下り増幅回路７の出力側に設けた第
１分岐器８の分岐端子を第２分岐器１３の分岐端子へ接
続し、第２分岐器１３の入力端子を通信端子３に接続
し、第２分岐器１３の出力端子を第２切換手段１１ｂを
介して上り増幅回路１０の入力部に接続している。The communication terminal 3 is connected via a first splitter 8 and a second splitter 13 as a separating means. More specifically, first, the branch terminal of the first branch unit 8 provided on the output side of the downstream amplification circuit 7 is connected to the branch terminal of the second branch unit 13, and the input terminal of the second branch unit 13 is connected to the communication terminal 3. The output terminal of the second splitter 13 is connected to the input of the upstream amplifier circuit 10 via the second switching means 11b.
【００１０】また、第１及び第２切換手段１１ａ，１１
ｂは１個の切換スイッチ１１として一体に形成され、切
換スイッチ１１を図示Ｂ側端子に接続した状態、即ちＣ
ＡＴＶ端子２からの上り信号を上り増幅回路１０に入力
する状態では通信端子３からの上り信号端子は開放状態
となり遮断される。そして、Ａ側端子に接続した状態、
即ち通信端子３からの上り信号が上り増幅回路１０に入
力される状態では、ＣＡＴＶ端子２からの上り端子はダ
ミー抵抗１４を介して接地され、信号が遮断されるよう
に形成されている。The first and second switching means 11a, 11
b denotes a state in which the changeover switch 11 is integrally formed as one changeover switch 11, and the changeover switch 11 is connected to the B-side terminal in the drawing, ie, C
When the upstream signal from the ATV terminal 2 is input to the upstream amplifier circuit 10, the upstream signal terminal from the communication terminal 3 is opened and cut off. And the state connected to the A-side terminal,
That is, when the upstream signal from the communication terminal 3 is input to the upstream amplifier circuit 10, the upstream terminal from the CATV terminal 2 is grounded via the dummy resistor 14, so that the signal is cut off.
【００１１】このように、通信端子３からの上り信号を
分離する分離手段として分岐器１３を使用し、その入出
力端子間を通過させることで、通信端子３からの上り信
号を殆ど減衰させることなくＣＡＴＶ幹線に伝送させる
ことができる。また、ＣＡＴＶ端子２を上り増幅回路１
０から切り離しても、切換スイッチをＡ側に倒すことで
終端されるので、ＣＡＴＶ端子２の上り回路が開放状態
になることが無い。従って、ＣＡＴＶ端子２が開放状態
となっても上り雑音が増加することがない。As described above, the splitter 13 is used as a separating means for separating the upstream signal from the communication terminal 3, and the branch signal is passed between the input and output terminals, whereby the upstream signal from the communication terminal 3 is almost attenuated. And can be transmitted to the CATV trunk line. Further, the CATV terminal 2 is connected to the upstream amplifier circuit 1
Even when the switch is disconnected from 0, the switch is terminated by moving the changeover switch to the A side, so that the upstream circuit of the CATV terminal 2 does not go into an open state. Therefore, even if the CATV terminal 2 is opened, the upward noise does not increase.
【００１２】図２は本発明の他の形態を示し、分離手段
にフィルタ回路を組み合わせた所謂ダイプレクサ１５を
使用している。このようにダイプレクサを使用しても、
使用素子数は増加するが良好な特性を得ることができ
る。FIG. 2 shows another embodiment of the present invention, in which a so-called diplexer 15 in which a filter circuit is combined with a separating means is used. Even when using a diplexer like this,
Although the number of elements used increases, good characteristics can be obtained.
【００１３】[0013]
【発明の効果】以上詳述したように、本発明によれば、
分配器を使用せず、上り信号の減衰は分岐器の入出力間
の減衰量のみであるので、上り信号の減衰量が大きくな
ることがない。また、出力端子が開放状態となっても上
り雑音が増加することが無い。As described in detail above, according to the present invention,
Since the splitter is not used and the attenuation of the upstream signal is only the amount of attenuation between the input and output of the branching device, the amount of attenuation of the upstream signal does not increase. In addition, even if the output terminal is in an open state, the upward noise does not increase.
【図１】本発明の実施の形態の１例を示す双方向増幅器
の回路ブロック図である。FIG. 1 is a circuit block diagram of a bidirectional amplifier showing an example of an embodiment of the present invention.
【図２】本発明の他の形態を示す回路ブロック図であ
る。FIG. 2 is a circuit block diagram showing another embodiment of the present invention.
【図３】従来の双方向増幅器を示す回路ブロック図であ
る。FIG. 3 is a circuit block diagram showing a conventional bidirectional amplifier.
１・・入力端子、２・・ＣＡＴＶ端子（第１出力端
子）、３・・通信端子（第２出力端子）、４，５・・信
号分離回路、７・・下り増幅回路、８・・第１分岐器、
１０・・上り増幅回路、１１・・切換スイッチ、１１ａ
・・第１切換手段、１１ｂ・・第２切換手段、１３・・
第２分岐器、１５・・ダイプレクサ。1 ··· input terminal, 2 ··· CATV terminal (first output terminal), 3 ··· communication terminal (second output terminal), 4, 5 ··· signal separation circuit, 7 ··· down amplifier circuit, 8 ··· 1 turnout,
10 ··· Up-amplifier circuit, 11 ··· Switch, 11a
..First switching means, 11b..Second switching means, 13, ..
Second branch, 15 diplexer.
Claims (3)
を出力する第１及び第２の出力端子を有し、下り増幅回
路と、各出力端子から入来する上り信号を増幅する上り
増幅回路とを有する双方向増幅器であって、第２出力端
子は下り増幅回路出力に分岐手段を設け、その分岐出力
を更に第２出力端子から入来する上り信号を分離する分
離手段を介して下り信号を出力すると共に、該分離手段
で分離された上り信号を第１切換手段を介して上り増幅
回路の入力部に接続し、第１出力端子は前記分岐手段の
出力部に接続して下り信号を出力すると共に、第１出力
端子から入来する上り信号を第２切換手段を介して上り
増幅器の入力部に接続して成ることを特徴とする双方向
増幅器。An input terminal for inputting a downstream signal and first and second output terminals for outputting the signal, a downstream amplifier circuit, and an upstream amplifier circuit for amplifying an upstream signal coming from each output terminal. Wherein the second output terminal is provided with a branching means at the output of the downstream amplifier circuit, and the branched output is further separated through the separating means for separating the upstream signal coming from the second output terminal. And the upstream signal separated by the separating unit is connected to the input of the upstream amplifier circuit via the first switching unit, and the first output terminal is connected to the output of the branching unit to output the downstream signal. A bidirectional amplifier, comprising an output and an upstream signal coming from a first output terminal connected to an input of the upstream amplifier via a second switching means.
入力端子を第２出力端子に接続し、分岐端子を分岐手段
の分岐出力部に接続し、更に分岐器の出力端子を第１切
換手段を介して上り増幅回路の入力部に接続して成る請
求項１記載の双方向増幅器。2. The branching means, wherein the input terminal of the branching device is connected to the second output terminal, the branching terminal is connected to the branching output of the branching device, and the output terminal of the branching device is connected to the second output terminal. 2. The bidirectional amplifier according to claim 1, wherein the bidirectional amplifier is connected to an input section of an up-amplifier circuit via one switching means.
第１出力端子か第２出力端子の何れか一方の信号線が上
り増幅器に接続される請求項１又は２記載の双方向増幅
器。3. The first switching means and the second switching means are linked,
3. The bidirectional amplifier according to claim 1, wherein one of the first output terminal and the second output terminal is connected to an upstream amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255902A JP4536888B2 (en) | 2000-08-25 | 2000-08-25 | Bidirectional amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255902A JP4536888B2 (en) | 2000-08-25 | 2000-08-25 | Bidirectional amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002076803A true JP2002076803A (en) | 2002-03-15 |
| JP4536888B2 JP4536888B2 (en) | 2010-09-01 |
Family
ID=18744610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000255902A Expired - Fee Related JP4536888B2 (en) | 2000-08-25 | 2000-08-25 | Bidirectional amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4536888B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0774559A (en) * | 1993-08-31 | 1995-03-17 | Nippon Antenna Co Ltd | Bidirectional amplifier |
| JPH11122597A (en) * | 1997-10-17 | 1999-04-30 | Miharu Tsushin Kk | Relay amplifier for catv system |
| JP2000050228A (en) * | 1998-07-30 | 2000-02-18 | N Ii C Cable Media Kk | Relay amplifier for two-way catv |
-
2000
- 2000-08-25 JP JP2000255902A patent/JP4536888B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0774559A (en) * | 1993-08-31 | 1995-03-17 | Nippon Antenna Co Ltd | Bidirectional amplifier |
| JPH11122597A (en) * | 1997-10-17 | 1999-04-30 | Miharu Tsushin Kk | Relay amplifier for catv system |
| JP2000050228A (en) * | 1998-07-30 | 2000-02-18 | N Ii C Cable Media Kk | Relay amplifier for two-way catv |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4536888B2 (en) | 2010-09-01 |
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