JPH04213986A - Amplifier for catv system - Google Patents
Amplifier for catv systemInfo
- Publication number
- JPH04213986A JPH04213986A JP2410293A JP41029390A JPH04213986A JP H04213986 A JPH04213986 A JP H04213986A JP 2410293 A JP2410293 A JP 2410293A JP 41029390 A JP41029390 A JP 41029390A JP H04213986 A JPH04213986 A JP H04213986A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- circuit
- amplifier circuit
- line
- bypass
- 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
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Details Of Television Systems (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ＣＡＴＶシステムに関
し、特に停電が発生した場合でも後段のシステムに対し
て情報の伝送を行うことができるＣＡＴＶシステム用増
幅器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV system, and more particularly to an amplifier for a CATV system that can transmit information to a subsequent system even in the event of a power outage.
【０００２】0002
【従来の技術】従来の大規模ＣＡＴＶシステムの全体構
成を第３図に示す。４１はＶＨＦ，ＵＨＦ，ＢＳ等の各
種アンテナ、４２はヘッドエンド装置、４３は通信線路
の幹線、４４は双方向幹線分配増幅器（ＴＤＡ）、４５
は双方向幹線分岐増幅器（ＴＢＡ）、４６は双方向幹線
増幅器（ＴＡ）、４７は双方向分岐増幅器（ＢＡ）、４
８は双方向延長増幅器（ＥＡ）、４９は端末である。ま
た、５０は停電時に使用する予備電源装置である。2. Description of the Related Art FIG. 3 shows the overall configuration of a conventional large-scale CATV system. 41 is various antennas such as VHF, UHF, BS, etc.; 42 is a head-end device; 43 is a communication line trunk line; 44 is a bidirectional trunk distribution amplifier (TDA); 45
is a bidirectional trunk amplifier (TBA), 46 is a bidirectional trunk amplifier (TA), 47 is a bidirectional branch amplifier (BA), 4
8 is a bidirectional extension amplifier (EA), and 49 is a terminal. Further, 50 is a standby power supply device used in the event of a power outage.
【０００３】各種アンテナ４１からの情報は、ヘッドエ
ンド装置４２を介して幹線４３に送り出される。幹線４
３に送り出された情報は、上記各増幅器４４〜４８によ
り増幅分岐され、各家庭に設置された端末４９に分配器
を介して提供される。上記のようなＣＡＴＶシステムに
あっては、例えば停電時には各増幅器４４〜４８に対し
て予備電源装置５０により約４時間電源が補償されるよ
うになっている。[0003] Information from various antennas 41 is sent to a main line 43 via a headend device 42 . Main line 4
The information sent to the terminal 3 is amplified and branched by each of the amplifiers 44 to 48, and provided to a terminal 49 installed in each home via a distributor. In the above-mentioned CATV system, for example, in the event of a power outage, each of the amplifiers 44 to 48 is compensated for by the backup power supply unit 50 for about four hours.
【０００４】0004
【発明が解決しようとする課題】しかしながら、停電時
において予備電源装置５０による電源補償時間内に停電
の処理が終了すれば、通常の電源による動作に戻るが、
ある幹線４３の途中で停電が生じ、復旧に時間がかかる
と予備電源装置５０では補償できなくなり、その幹線４
３を含むそれ以降の幹線系に対し情報の提供ができなく
なるという問題があった。However, in the event of a power outage, if the power outage processing is completed within the power supply compensation time by the standby power supply device 50, the operation returns to normal power supply.
If a power outage occurs in the middle of a certain main line 43 and it takes time to recover, the backup power supply unit 50 will not be able to compensate, and the main line 4
There was a problem in that information could no longer be provided to the trunk lines after that including 3.
【０００５】本発明は上記従来の課題を解決し、通信線
路の途中で停電が生じ、復旧作業に時間がかかって予備
電源装置による補償ができない事態が生じても、停電が
生じた通信線路以降の通信線路系に対し情報の提供を行
うことができるＣＡＴＶシステム用増幅器を提供するこ
とを目的とする。The present invention solves the above-mentioned conventional problems, and even if a power outage occurs in the middle of a communication line and restoration work takes time and compensation cannot be performed by a standby power supply device, the power supply from the communication line where the power outage occurred An object of the present invention is to provide an amplifier for a CATV system that can provide information to a communication line system.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する本発
明は、ＣＡＴＶシステムの通信線路に設置され、該通信
線路を介して伝送される信号の増幅を行う増幅回路を備
えるＣＡＴＶシステム用増幅器において、信号を上記増
幅回路を介さずそのまま通過させるバイパス回路を設け
、該バイパス回路は、入力側と出力側を短絡するパス線
路と、信号の経路を上記増幅回路側あるいはパス線路側
に切替える切替え手段を設けてなることを特徴とする。
また、第２項の発明は、上記バイパス回路を、幹線用の
増幅回路と分岐用の増幅回路の双方に設けたことを特徴
とする。[Means for Solving the Problems] The present invention achieves the above object, and provides an amplifier for a CATV system that is installed in a communication line of a CATV system and includes an amplifier circuit that amplifies a signal transmitted via the communication line. , a bypass circuit is provided that allows the signal to pass through without going through the amplifier circuit, and the bypass circuit includes a path line that shorts the input side and the output side, and a switching means that switches the signal path to the amplifier circuit side or the path line side. It is characterized by having the following. Furthermore, the invention according to item 2 is characterized in that the bypass circuit is provided in both the main amplifier circuit and the branch amplifier circuit.
【０００７】[0007]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。第１図に本発明の一実施例によるＣＡＴＶ
システム用増幅器の基本構成を示す。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a CATV according to an embodiment of the present invention.
The basic configuration of the system amplifier is shown.
【０００８】本ＣＡＴＶシステム用増幅器は、情報信号
の伝送を行う通信線路に接続することにより、通信線路
を伝送中に減衰する情報信号を増幅して伝えるものであ
り、信号の増幅を行う増幅回路１と、増幅部を介さずに
信号をそのまま次段に伝えるバイパス回路２とで構成さ
れている。[0008] This CATV system amplifier is connected to a communication line that transmits information signals to amplify and transmit information signals that are attenuated during transmission on the communication line, and is an amplifier circuit that amplifies the signal. 1, and a bypass circuit 2 that directly transmits the signal to the next stage without going through an amplification section.
【０００９】そして、上記バイパス回路２は、増幅器の
入力端子７と出力端子８を短絡するパス線路５と、信号
の経路を上記増幅回路１側あるいはパス線路５側に切替
える切替え手段であるバイパスリレー６とで構成されて
いる。The bypass circuit 2 includes a path line 5 that short-circuits the input terminal 7 and output terminal 8 of the amplifier, and a bypass relay that is a switching means for switching the signal path to the amplifier circuit 1 side or the path line 5 side. It consists of 6.
【００１０】通常の電源供給状態では、バイパスリレー
６が、増幅回路１側に接続されており、通信線路を伝送
される情報信号の増幅が行われている。[0010] In a normal power supply state, the bypass relay 6 is connected to the amplifier circuit 1 side, and the information signal transmitted through the communication line is amplified.
【００１１】停電が発生した場合、当初は予備電源によ
り電源が供給されるので、バイパスリレー６は増幅回路
１側に接続されたままである。しかし、予備電源の補償
時間内に復旧処理が終了せず、電源の供給がなされなく
なると、バイパスリレー６がパス線路５側に切替えられ
る。この場合、信号は増幅回路１により増幅されないの
で、増幅器以降の通信線路に対し出力が減衰した状態で
伝送されることになる。しかし、この場合の信号の減衰
は一つの増幅器に対し約２０ｄｂであるので、多少質は
落ちるが実用上差し支えない程度で済む。When a power outage occurs, the bypass relay 6 remains connected to the amplifier circuit 1 because power is initially supplied from the standby power source. However, if the restoration process is not completed within the compensation time of the standby power source and power is no longer supplied, the bypass relay 6 is switched to the path line 5 side. In this case, since the signal is not amplified by the amplifier circuit 1, the signal is transmitted to the communication line after the amplifier with an attenuated output. However, since the signal attenuation in this case is about 20 dB for one amplifier, the quality is somewhat degraded, but it is sufficient for practical purposes.
【００１２】次に、本発明をＣＡＴＶシステムの双方向
増幅器に適用した実施例を第２図に示す。Next, FIG. 2 shows an embodiment in which the present invention is applied to a bidirectional amplifier for a CATV system.
【００１３】図において、１０は入力端子、１１はハイ
パスフィルター、１２はローパスフィルター、１３は下
り幹線用増幅回路（ＦＴＡ）、１４は下り幹線用バイパ
ス回路、１６は下り幹線用バイパス回路１３を構成する
パス線路、１７，１７はバイパスリレー、１８は下り幹
線用増幅回路１３の入力側に設けられた下り疑似線路（
ＢＯＮ）、１９はハイパスフィルター、２０はローパス
フィルター、２１は出力端子、２２は下り分岐用増幅回
路（ＦＢＡ）、２３は下り分岐用バイパス回路、２４は
パス線路、２５，２５はバイパスリレー、２６はハイパ
スフィルター、２７はローパスフィルター、２８は分配
器、２８ａは分配器の出力端子、３１は上り幹線分岐用
増幅回路（ＲＴＡ−Ｂ）、３２は上り幹線分岐増幅回路
３１の出力側に設けられた上り疑似線路（ＢＯＮ）であ
る。また、３４は下り幹線の入力モニタ端子、３５は下
り幹線の出力モニタ端子、３６は上り幹線の入力モニタ
端子、３７は上り幹線の出力モニタ端子、３８は上り分
岐入力モニタ端子、３９は下り分岐出力モニタ端子であ
る。In the figure, 10 is an input terminal, 11 is a high-pass filter, 12 is a low-pass filter, 13 is an amplifier circuit for downlink trunks (FTA), 14 is a bypass circuit for downlink trunks, and 16 is a bypass circuit 13 for downlink trunks. 17, 17 are bypass relays, 18 is a downlink pseudo line (
BON), 19 is a high-pass filter, 20 is a low-pass filter, 21 is an output terminal, 22 is a downstream branch amplifier circuit (FBA), 23 is a downstream bypass circuit, 24 is a path line, 25, 25 is a bypass relay, 26 is a high-pass filter, 27 is a low-pass filter, 28 is a distributor, 28a is an output terminal of the distributor, 31 is an upstream trunk branching amplifier circuit (RTA-B), and 32 is provided on the output side of the upstream trunk branching amplifier circuit 31. This is an upstream pseudo-line (BON). Further, 34 is an input monitor terminal of the down trunk line, 35 is an output monitor terminal of the down trunk line, 36 is an input monitor terminal of the up trunk line, 37 is an output monitor terminal of the up trunk line, 38 is an up branch input monitor terminal, and 39 is a down branch This is an output monitor terminal.
【００１４】下りの入力端子１０と出力端子２１及び上
りの入力端子３６は通信線路の幹線に接続され、出力端
子２８ａは次段の分岐増幅器に接続される。The downstream input terminal 10 and output terminal 21 and the upstream input terminal 36 are connected to the main line of the communication line, and the output terminal 28a is connected to the next stage branch amplifier.
【００１５】入力端子１０から入力された下り信号は、
ハイパスフィルター１１を介して下り幹線用増幅回路１
３に入力し、増幅されて出力端子２１から出力される。
下り幹線用増幅回路１３で増幅された入力信号の一部は
、分岐されて下り分岐用増幅回路２２で増幅されハイパ
スフィルター２６を介して伝送され、分配器２８で４分
配され各出力端子２８ａから次段の分岐増幅器に出力さ
れる。また、上り信号は、出力端子２１から入力されて
ローパスフィルター２０を介して上り幹線分岐増幅回路
３１に入力され、上り幹線分岐増幅回路３１で増幅され
てローパスフィルター１２を介して入力端子１０から出
力される。ここで、ハイパスフィルター１１，１９，２
６は７０ＭＨｚ から４５０ ＭＨｚの周波数帯域を使
い下り方向の情報を伝送している。また、ローパスフィ
ルター１２，２０，２７は１０ＭＨｚ から５０ＭＨｚ
の周波数帯域を使用して上り方向の情報を伝送してい
る。The downlink signal input from the input terminal 10 is
Downlink trunk amplifier circuit 1 via high-pass filter 11
3, is amplified and output from the output terminal 21. A part of the input signal amplified by the downlink trunk amplifier circuit 13 is branched, amplified by the downlink branch amplifier circuit 22, transmitted through the high-pass filter 26, and divided into four parts by the divider 28 from each output terminal 28a. It is output to the next stage branch amplifier. Further, the upstream signal is inputted from the output terminal 21 and inputted to the upstream trunk branch amplifier circuit 31 via the low-pass filter 20, amplified by the upstream trunk branch amplifier circuit 31, and outputted from the input terminal 10 via the low-pass filter 12. be done. Here, high pass filters 11, 19, 2
6 uses a frequency band from 70 MHz to 450 MHz to transmit downstream information. In addition, the low pass filters 12, 20, 27 have a frequency range of 10MHz to 50MHz.
The frequency band is used to transmit upstream information.
【００１６】下り幹線用バイパス回路１４及び下り分岐
用バイパス回路２３のバイパスリレー１７，１７と２５
，２５は、通常の電源供給状態では、それぞれ下り幹線
用増幅回路１３と下り分岐用増幅回路２２側に接続され
ている。停電が発生した場合、当初は予備電源が供給さ
れることから、予備電源の補償時間の間はバイパスリレ
ー１７，１７と２５，２５はそのまま下り幹線用増幅回
路１３と下り分岐用増幅回路２２に接続されたままであ
る。Bypass relays 17, 17 and 25 of the down trunk bypass circuit 14 and the down branch bypass circuit 23
, 25 are connected to the downstream trunk amplifier circuit 13 and the downstream branch amplifier circuit 22, respectively, in a normal power supply state. When a power outage occurs, backup power is initially supplied, so the bypass relays 17, 17 and 25, 25 remain connected to the downlink trunk amplifier circuit 13 and downlink branch amplifier circuit 22 during the backup power supply compensation time. Stay connected.
【００１７】停電の復旧作業が遅れ予備電源の補償時間
が過ぎて電源の供給が行われなくなると、バイパスリレ
ー１７，１７と２５，２５はパス線路１６、２４側に切
替わり、信号はパス線路１６、２４を介して出力される
。この場合、信号は、下り幹線用増幅回路１３、下り分
岐用増幅回路２２で増幅されることなく当該増幅器以降
の幹線系に対し減衰した状態で出力されるようになる。
しかし、上述したように出力の減衰は、一つの増幅器に
対し約２０ｄｂ程度であり、ＴＶ信号では実用上問題は
生じない。When the restoration work from the power outage is delayed and the compensation time of the standby power source has passed and power is no longer supplied, the bypass relays 17, 17 and 25, 25 are switched to the path lines 16, 24, and the signal is transferred to the path line. 16 and 24. In this case, the signal is not amplified by the downstream trunk amplifier circuit 13 or the downstream branch amplifier circuit 22, but is output in an attenuated state to the trunk system after the amplifier. However, as mentioned above, the output attenuation is about 20 db for one amplifier, and there is no practical problem with TV signals.
【００１８】[0018]
【発明の効果】以上説明したように本発明のＣＡＴＶシ
ステム用増幅器によれば、信号を増幅回路を介さずその
まま通過させるバイパス回路を設けたことにより、幹線
の途中で停電が生じ、復旧作業に時間がかかって予備電
源装置による補償ができない事態が生じても、停電が生
じた通信線路以降の通信線路系に対し情報の提供を行う
ことができるようになる。第２項の発明によれば、上記
バイパス回路を、幹線用の増幅回路と分岐用の増幅回路
の双方に設けたことにより、幹線側と分岐側双方に対し
情報の提供が行える。[Effects of the Invention] As explained above, according to the CATV system amplifier of the present invention, by providing a bypass circuit that allows the signal to pass through as it is without going through the amplifier circuit, power outage occurs in the middle of the main line, and restoration work is required. Even if a situation arises in which compensation cannot be performed by the standby power supply device due to a long time, it becomes possible to provide information to the communication line system after the communication line where the power outage occurred. According to the second aspect of the invention, by providing the bypass circuit in both the main line amplifier circuit and the branch amplifier circuit, information can be provided to both the main line side and the branch side.
【図１】本発明のＣＡＴＶシステム用増幅器の基本構成
を示す回路図である。FIG. 1 is a circuit diagram showing the basic configuration of an amplifier for a CATV system according to the present invention.
【図２】本発明を双方向増幅器に適用した実施例の回路
図である。FIG. 2 is a circuit diagram of an embodiment in which the present invention is applied to a bidirectional amplifier.
【図３】従来の大規模ＣＡＴＶシステムの全体構成を示
すブロック図である。FIG. 3 is a block diagram showing the overall configuration of a conventional large-scale CATV system.
１ 増幅回路 ２ バイパス回路 ５ パス線路 ６ バイパスリレー ７ 入力端子 ８ 出力端子 １０ 入力端子 １３ 下り幹線用増幅回路 １４ 下り幹線用バイパス回路 １６ パス線路 １７ バイパスリレー ２１ 出力端子 ２２ 下り分岐用増幅回路 ２３ 下り分岐用バイパス回路 ２４ パス線路 ２５ バイパスリレー ２８ 分配器 ３１ 上り幹線分岐増幅回路 1 Amplifier circuit 2 Bypass circuit 5 Path line 6 Bypass relay 7 Input terminal 8 Output terminal 10 Input terminal 13 Downlink trunk amplifier circuit 14 Downlink trunk bypass circuit 16 Path line 17 Bypass relay 21 Output terminal 22 Downward branch amplifier circuit 23 Downward branch bypass circuit 24 Path line 25 Bypass relay 28 Distributor 31 Upstream trunk branch amplifier circuit
Claims (2)
れ、該通信線路を介して伝送される信号の増幅を行う増
幅回路を備えるＣＡＴＶシステム用増幅器において、信
号を上記増幅回路を介さずそのまま通過させるバイパス
回路を設け、該バイパス回路は、入力側と出力側を短絡
するパス線路と、信号の経路を上記増幅回路側あるいは
パス線路側に切替える切替え手段を設けてなることを特
徴とするＣＡＴＶシステム用増幅器。1. A bypass for a CATV system that is installed in a communication line of a CATV system and includes an amplifier circuit that amplifies a signal transmitted via the communication line, which allows the signal to pass through as it is without going through the amplification circuit. An amplifier for a CATV system, characterized in that the bypass circuit is provided with a path line that short-circuits the input side and the output side, and a switching means that switches the signal path to the amplifier circuit side or the path line side. .
路と分岐用の増幅回路の双方に設けたことを特徴とする
請求項第１項に記載のＣＡＴＶシステム用増幅器。2. The amplifier for a CATV system according to claim 1, wherein the bypass circuit is provided in both a main amplifier circuit and a branch amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2410293A JPH04213986A (en) | 1990-12-12 | 1990-12-12 | Amplifier for catv system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2410293A JPH04213986A (en) | 1990-12-12 | 1990-12-12 | Amplifier for catv system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04213986A true JPH04213986A (en) | 1992-08-05 |
Family
ID=18519477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2410293A Pending JPH04213986A (en) | 1990-12-12 | 1990-12-12 | Amplifier for catv system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04213986A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5747888A (en) * | 1995-10-17 | 1998-05-05 | Zilberberg; David | Back up system for the supply of voltage in television cable systems |
| JP2012235345A (en) * | 2011-05-02 | 2012-11-29 | Hochiki Corp | Booster |
| EP2736266A1 (en) * | 2012-11-21 | 2014-05-28 | ams AG | Signal processing device and active headphone with such a signal processing device |
| CN107204754A (en) * | 2016-03-18 | 2017-09-26 | 立积电子股份有限公司 | Active circuit |
-
1990
- 1990-12-12 JP JP2410293A patent/JPH04213986A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5747888A (en) * | 1995-10-17 | 1998-05-05 | Zilberberg; David | Back up system for the supply of voltage in television cable systems |
| JP2012235345A (en) * | 2011-05-02 | 2012-11-29 | Hochiki Corp | Booster |
| EP2736266A1 (en) * | 2012-11-21 | 2014-05-28 | ams AG | Signal processing device and active headphone with such a signal processing device |
| CN107204754A (en) * | 2016-03-18 | 2017-09-26 | 立积电子股份有限公司 | Active circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU595560B2 (en) | Channel switching system | |
| JP3285288B2 (en) | Amplifying device for adjusting main line amplifier of CATV system | |
| JP3233511B2 (en) | Adjustment method of main amplifier in CATV system | |
| JP3335920B2 (en) | Relay amplifier for bidirectional CATV | |
| WO1996012354A3 (en) | Communication network comprising a transceiver | |
| JPH11252528A (en) | Noise detection control device in CATV system | |
| JPH05219507A (en) | Backup method for amplifier in two-way catv system | |
| JP3233512B2 (en) | Adjustment method of main amplifier in CATV system | |
| JPH0382272A (en) | High frequency signal switch and its operating method | |
| JP2600973B2 (en) | Bidirectional CATV repeater | |
| JP3281501B2 (en) | Amplifying device for adjusting main line amplifier of CATV system | |
| JP3222690B2 (en) | Cross-polarization interference compensator and radio receiver | |
| JP3494957B2 (en) | Feedforward amplifier | |
| JP3400113B2 (en) | Feedforward amplifier | |
| JP3553308B2 (en) | Distortion compensation amplifier | |
| JPS62307Y2 (en) | ||
| JPS62286326A (en) | Switching system for television transmitter without stopping radio wave | |
| JP2605935Y2 (en) | Amplifier for joint hearing facilities | |
| JP2917692B2 (en) | CATV transmission line switch monitoring system | |
| JP3056779B2 (en) | Optical transmission system | |
| JPH0735499Y2 (en) | CATV bidirectional relay amplifier | |
| JPH04282921A (en) | Line changeover device | |
| JP2531131Y2 (en) | CATV repeater | |
| JP5154025B2 (en) | Relay amplifier | |
| AU661381B2 (en) | A packet data processor |