JPH0217776A - Community receiving system - Google Patents
Community receiving systemInfo
- Publication number
- JPH0217776A JPH0217776A JP63167615A JP16761588A JPH0217776A JP H0217776 A JPH0217776 A JP H0217776A JP 63167615 A JP63167615 A JP 63167615A JP 16761588 A JP16761588 A JP 16761588A JP H0217776 A JPH0217776 A JP H0217776A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- satellite broadcast
- branch
- main line
- 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
- 239000000203 mixture Substances 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、ヘッドエンドからＶＨＦ帯の信号が伝送され
る幹線路上に幹線分岐増幅器を介在し、幹線分岐増幅器
で分岐した信号を分配系ネットワークを介し分配供給す
る、例えばＣＡＴＶシステム等の共聴システムに係るも
ので、特にＶ ＨＦ ’＋４Ｆの受信信号に衛星放送の
受信信号を重畳し伝送分配する共聴システムに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a main branch amplifier on the main line through which VHF band signals are transmitted from the head end, and the signals branched by the main branch amplifier are transmitted to the distribution network. The present invention relates to a public listening system such as a CATV system, in which a received signal of VHF'+4F is superimposed with a received signal of satellite broadcasting, and transmitted and distributed.
［従来の技術］
ＣＡＴＶシステムは、特殊な形態（例えば集合住宅等）
を除き、長距離に亙り伝送する同軸ケーブルのネットワ
ークを有することから、同軸ケーブルの減衰量が問題と
なり、特に、周波数が高くなる程、減衰量が大きくなる
。このため、一般にはＶＨＦ帯での伝送が基本になって
いる。[Conventional technology] CATV systems are used in special formats (for example, apartment complexes, etc.)
Except for the above, because a coaxial cable network is used for transmission over long distances, the amount of attenuation of the coaxial cable becomes a problem, and in particular, the higher the frequency, the greater the amount of attenuation. For this reason, transmission in the VHF band is generally the norm.
又、衛星放送の受信信号は衛星放送受信アンテナに設け
たコンバータにより、受信したＳＨＦ帯の電波を１０３
５〜１３３５ＭＩＩＺ（通常、これを−括して、１．３
ＧｌｌＺ帯、或いはＢＳ−ＩＦ（衛星中間周波数）と称
している）に周波数変換して伝送することが、集合住宅
等の小規模なシステムには実施されている。In addition, the received signal of satellite broadcasting is converted into 103.
5 to 1335 MIIZ (Usually, this is grouped together as 1.3
Frequency conversion and transmission to the GLLZ band or BS-IF (satellite intermediate frequency) is implemented in small-scale systems such as apartment complexes.
しかしながらＶＨＦ帯での伝送を主体とした規模の大き
なＣＡＴＶシステムでは、幹線路に於ける同軸ケーブル
の減衰量が１．３０ＩＩＺ帯では大きく、この減衰を補
うためには、幹線増幅器を多数接続して対応する必要が
あり、このためＶＨＦ帯に比較して接続段数が大幅に増
加して増幅器内部で発生する雑音の累積等のためにＳＮ
比が低下してしまうという問題が生じる。又、高い周波
数を扱うことから、増幅器が高価となり、経済性の面で
も問題が生じる。However, in a large-scale CATV system that mainly transmits in the VHF band, the attenuation of the coaxial cable in the main line is large in the 1.30IIZ band, and in order to compensate for this attenuation, many main line amplifiers are connected. For this reason, the number of connection stages has increased significantly compared to the VHF band, and the SN
A problem arises in that the ratio decreases. Furthermore, since high frequencies are handled, amplifiers become expensive, which also poses a problem in terms of economic efficiency.
［発明が解決しようとする課題］
そこで、従来では、ヘッドエンドに於いて、衛星放送を
受信し復調して、従来の地上放送で行なっている方式と
同様の６Ｍ１ｌＺ帯のテレビジョン信号に再度復調し、
空チャネルに送出している。[Problems to be Solved by the Invention] Conventionally, the head end receives and demodulates satellite broadcasting, and demodulates it again into a television signal in the 6M11Z band, which is the same method used in conventional terrestrial broadcasting. death,
Sending to an empty channel.
しかし、このような従来の方式では、衛星放送の特徴の
一つであるＰＣＭ信号をそのまま伝送して直接デコード
する高忠実度な音声信号の再生ができないという問題が
あった。However, such conventional systems have a problem in that they cannot reproduce high-fidelity audio signals by directly transmitting and directly decoding PCM signals, which is one of the characteristics of satellite broadcasting.
本発明は上記実情に鑑みなされたもので、ＶＨＦ帯の受
信信号に衛星放送の受信信号を重畳し伝送分配する共聴
システムに於いて、経済的に有利な構成で各分配供給先
にてＰＣＭ音声による衛星放送を高忠実度再生できる共
聴システム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 circumstances, and provides PCM at each distribution destination using an economically advantageous configuration in a communal listening system that superimposes a received signal of a satellite broadcast on a received signal of the VHF band and transmits and distributes the signal. The purpose of the present invention is to provide a communal listening system that can reproduce audio satellite broadcasts with high fidelity.
［課題を解決するための手段及び作用］本発明は、ヘッ
ドエンドからＶＨＦ帯の信号が伝送される幹線路上に幹
線分岐増幅器を介在し、幹線分岐増幅器で分岐した信号
を分配系ネットワークを介し分配供給する共聴システム
に於いて、上記幹線分岐増幅器に対応して衛星放送受信
アンテナを設け、上記幹線分岐増幅器に、上記衛星放送
受信アンテナのコンバータ出力信号を増幅する専用増幅
器と、同増幅器の出力信号と上記幹線路上のＶＨＦ帯の
信号とを混合し上記分配系ネットワークに出力する混合
器とを設けて、伝送距離の長い幹線路には特に手を付け
ず、伝送距離の短い分配系ネットワークにのみ、既存Ｖ
ＨＦ帯の信号に１．３ＧＩＺ帯のＢＳ−ＩＦ倍信号混合
し伝送する構成としたもので、これにより各分配供給先
（受信者宅） ＋、：テ１． ３ＧＩＩＺ帯（７）ＢＳ
−ＩＦ倍信号受信し、ＢＳチューナを用いてＰＣＭ音声
による衛星放送を高忠実度再生できる。[Means and effects for solving the problem] The present invention provides a main branch amplifier on the main line through which VHF band signals are transmitted from the head end, and distributes the signal branched by the main branch amplifier through a distribution network. In the public listening system to be supplied, a satellite broadcast receiving antenna is provided corresponding to the main branch amplifier, and the main branch amplifier includes a dedicated amplifier for amplifying the converter output signal of the satellite broadcast receiving antenna, and the output of the amplifier. A mixer is installed to mix the signal and the VHF band signal on the main line and output it to the distribution network, so that the main line with a long transmission distance is not touched, and the distribution network with a short transmission distance is used. only, existing V
The configuration is such that the HF band signal is mixed with the BS-IF signal of the 1.3 GIZ band and transmitted, and thereby each distribution supply destination (receiver's home) +, :Te1. 3GIIZ band (7) BS
- It is possible to receive IF multiplied signals and reproduce satellite broadcasts with PCM audio with high fidelity using a BS tuner.
［実施例］ 以下図面を参照して本発明の一実施例を説明する。[Example] An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明をＣＡＴＶシステムに適用した本発明の
一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention in which the present invention is applied to a CATV system.
図中、１１はＶＨＦ帯及びＵＨＦ帯の受信アンテナ、１
２は受信アンテナ１１の受信電波をＶＨＦ帯のテレビジ
ョン信号として幹線路１３上に送出するヘッドエンド、
１３はヘッドエンド１２から送出されたＶＨＦ帯のテレ
ビジョン信号を伝送する幹線路である。In the figure, 11 is a VHF band and UHF band receiving antenna;
2 is a head end that transmits radio waves received by the receiving antenna 11 onto the main line 13 as a VHF band television signal;
Reference numeral 13 denotes a main line for transmitting VHF band television signals sent from the head end 12.
１４、１４．・・・は幹線路１３上に設けられた幹線分
岐増幅器、１５．１５．・・・は幹線分岐増幅器１４．
１４．・・・に対応して設けられた衛星放送受信アンテ
ナ、１５ａは同アンテナのコンバータである。上記幹線
分岐増幅器１４には、上記衛星放送受信アンテナ１５の
コンバータ１５ａより出力される１、３ＧＩ−１２帯の
ＢＳ−ＩＦ倍信号増幅する専用増幅器、及び同増幅器の
出力信号と上記幹線路上のＶＨＦ帯の信号とを混合し上
記分配系ネットワークに出力する混合器等を設けてなる
もので、この幹線分岐増幅器１４の構成は第２図を用い
て後に説明する。14, 14. ... are main line branch amplifiers provided on the main line 13, 15.15. . . . is the trunk branch amplifier 14.
14. . . . A satellite broadcast receiving antenna is provided corresponding to the antenna, and 15a is a converter of the antenna. The main line branch amplifier 14 includes a dedicated amplifier for amplifying the BS-IF signal of the 1st and 3GI-12 bands output from the converter 15a of the satellite broadcast receiving antenna 15, and the output signal of the amplifier and the VHF on the main line. The configuration of the trunk branch amplifier 14 will be explained later with reference to FIG. 2.
１６は幹線分岐増幅器１４の分岐出力を各受信者宅に分
配するための分配系ネットワークであり、１７は分岐増
幅器、１８はタップオフ、１９は延長増幅器である。２
１は受信者宅に設けられた衛星放送受信チューナ、２２
は同テレビジョン受像機であり、ここでは保安器２３及
び分配器２４を介して分配系ネットワーク１Ｂの分配出
力を受信している。16 is a distribution network for distributing the branch output of the trunk branch amplifier 14 to each receiver's home, 17 is a branch amplifier, 18 is a tap-off, and 19 is an extension amplifier. 2
1 is a satellite broadcast reception tuner installed at the recipient's home; 22
is the same television receiver, and here receives the distribution output of the distribution network 1B via the protector 23 and the distributor 24.
第２図は上記幹線分岐増幅器１４の内部構成要素を示す
ブロック図である。FIG. 2 is a block diagram showing the internal components of the trunk branch amplifier 14.
図中、１４１は幹線路１３に接続される幹線入力端ＶＩ
ＩＰ−ＩＮと幹線出力端ＶＩＩＰ−ＯＵＴとの間に於イ
テ、幹線入力端ＶＩＩＰ−ＩＮで受けたたＶＨＦ帯の信
号を増幅し幹線出力端ＶＩＩＰ−ＯＵＴに送出する幹線
増幅部、１４２は上記幹線増幅部１４１を経たＶＨＦ帯
の信号を分岐出力するための分配増゛幅部である。１４
３は自己の幹線分岐増幅器Ｉ４に対応して設けられた衛
星放送受信アンテナ１５のコンバータ出力、即ちＢＳ−
ＩＦ倍信号専用の入力端ＢＳ−Ｉ Ｐ−Ｉ Ｎより受け
て増幅するＢＳ−ＩＦ増幅部、１４４はコンバータ駆動
電源（例えば１５ｖ／４ｖ）を得る直流電源部である。In the figure, 141 is the main line input terminal VI connected to the main line 13.
Between IP-IN and the main line output terminal VIIP-OUT, a main line amplifying section 142 amplifies the VHF band signal received at the main line input terminal VIIP-IN and sends it to the main line output terminal VIIP-OUT. This is a distribution amplification section for branching out the VHF band signal that has passed through the main amplification section 141. 14
3 is the converter output of the satellite broadcast receiving antenna 15 provided corresponding to its own trunk branch amplifier I4, that is, BS-
A BS-IF amplifying section 144 receives and amplifies the IF multiplied signal from an input terminal BS-IP-I N, and is a DC power supply section that obtains a converter drive power source (for example, 15v/4v).
１４５は上記分配増幅部１４２より出力されるＶ ＨＦ
帯の信号と上記ＢＳ−ＩＦ増幅部１４３より出力される
１、３０ＩＩＺ帯のＢＳ−ＩＦ倍信号を混合する混合器
である。１４６は混合器１４５で混合された信号を分岐
端子Ｓ、・・・に分配出力する分配器である。145 is the VHF output from the distribution amplification section 142.
This is a mixer that mixes the band signal and the BS-IF multiplied signal of the 1 and 30 IIZ band output from the BS-IF amplifier section 143. 146 is a distributor that distributes and outputs the signal mixed by the mixer 145 to branch terminals S, .
ここで上記第１図及び第２図を参照して本発明の一実施
例に於ける動作を説明する。The operation of an embodiment of the present invention will now be described with reference to FIGS. 1 and 2.
受信アンテナ１１で受信したＶＨＦ帯及びＵＨＦ帯の受
信電波はヘッドエンド１２を介しＶＨＦ帯のテレビジョ
ン信号として幹線路１３に介在された幹線分岐増幅器１
４に伝送される。この幹線分岐増幅器１４に人力された
ＶＨＦ帯のテレビジョン信号は幹線路１３での減衰を補
うべく幹線増幅部１４１により中継増幅された後、幹線
路１３を介して次の幹線分岐増幅器１４に伝送されると
ともに、分配増幅部１４２により、分岐端子側に必要な
信号を供給すべく増幅される。The received radio waves in the VHF band and UHF band received by the receiving antenna 11 are transmitted through the head end 12 to the main line branch amplifier 1 interposed in the main line 13 as a television signal in the VHF band.
4. The VHF band television signal inputted to the main line branch amplifier 14 is relayed and amplified by the main line amplifier 141 to compensate for attenuation on the main line 13, and then transmitted to the next main line branch amplifier 14 via the main line 13. At the same time, the signal is amplified by the distribution amplification section 142 to supply a necessary signal to the branch terminal side.
一方、衛星受信アンテナ１５で受信したＳＨＦ帯の衛星
放送電波は、同アンテナのコンバータ１５ａにより、１
．３０ＩＩＺ帯のＢＳ−ＩＦ倍信号変換された後、幹線
分岐増幅器１４の専用の入力端ＢＳ−１［’−ＩＮに供
給され、ＢＳ−ＩＦ増幅部１４３により増幅される。On the other hand, the SHF band satellite broadcast radio waves received by the satellite receiving antenna 15 are converted to 1 by the converter 15a of the antenna.
．． After being converted into a BS-IF signal of the 30IIZ band, the signal is supplied to the dedicated input terminal BS-1['-IN of the trunk branch amplifier 14 and amplified by the BS-IF amplifying section 143.
上記分配増幅部１４２より出力されたＶＩ（Ｆ帯の信号
とＢＳ−ＩＦ増幅部１４３より出力された１、ｑ３ｃｏ
ｚ帯（７）ＢＳ−ＩＦ倍信号、混合器１４５１．：より
混合された後、分配器１４０により複数の分岐端子Ｓ、
・・・に分配供給される。VI (F band signal outputted from the distribution amplification section 142 and 1, q3co outputted from the BS-IF amplification section 143)
Z band (7) BS-IF double signal, mixer 1451. : After being mixed, a plurality of branch terminals S,
It will be distributed and supplied to...
上記分岐端子Ｓ、・・・より出力された信号は同軸ケー
ブルを介して分岐増幅器１７に供給され増幅された後、
分配系ネットワーク１６の一部を構成するタップオフ１
８、及び保安器２３等を介して受信者宅へ分配供給され
る。この際、分配系ネットワーク１６の伝送路となる同
軸ケーブル長は比較的短いため、１．３０ＩＩＺ帯のＢ
Ｓ−ＩＦ倍信号ＶＨＦ帯の信号と同様に殆ど減衰するこ
となく受信者宅へ分配供給される。The signals output from the branch terminals S, . . . are supplied to the branch amplifier 17 via the coaxial cable and amplified, and then
Tap-off 1 forming part of distribution network 16
8 and the protector 23, etc., to the recipient's home. At this time, since the length of the coaxial cable serving as the transmission path of the distribution network 16 is relatively short, the B of the 1.30IIZ band
Similar to the S-IF multiplied signal VHF band signal, the signal is distributed to the recipient's home with almost no attenuation.
受信者宅へ分配供給された信号は分配器２４によりＶＨ
Ｆ帯の信号とＢＳ−ＩＦ倍信号に分岐され、ＶＨＦ帯の
信号が直接テレビジョン受像機２２に、又、ＢＳ−ＩＦ
倍信号衛星放送受信チューナ２１に供給される。The signal distributed to the receiver's house is sent to VH by the distributor 24.
The VHF band signal is branched into an F band signal and a BS-IF double signal, and the VHF band signal is sent directly to the television receiver 22 and also to the BS-IF signal.
The signal is supplied to the double signal satellite broadcast reception tuner 21.
これにより各受信者宅に於いてＰＣＭ音声による衛星放
送の受信が可能となる。This makes it possible to receive satellite broadcasting using PCM audio at each recipient's home.
又、上記した実施例の構成を採ることにより、既存のＣ
ＡＴＶシステムに大きな負担をかけることなく、既存の
Ｖ ＨＦ ｔｆ倍信号よるテレビジョン放送に加えて、
ＰＣＭ音声による衛星放送の受信が可能となる。Also, by adopting the configuration of the above embodiment, the existing C
In addition to television broadcasting using the existing VHF tf signal, without placing a large burden on the ATV system,
It becomes possible to receive satellite broadcasting using PCM audio.
又、上記した実施例のシステム構成に於いて、雨足放送
受信チューナ２１を使用しない場合は、既存のＶＨＦ帯
に於けるＣＡＴＶシステムと全く同様の機能をもつこと
になる。Furthermore, in the system configuration of the above-described embodiment, if the rain broadcast reception tuner 21 is not used, the system has exactly the same functions as the existing CATV system in the VHF band.
又、衛星放送受信信号をＢＳ−ＩＦ帯のままで受信者宅
へ伝送できるので、将来の例えばハイビジョン等の導入
に際しても大きなシステム変更を伴うことなく容易に実
現可能である。Furthermore, since the satellite broadcasting reception signal can be transmitted to the recipient's home in the BS-IF band, it is possible to easily implement high-definition systems in the future without making any major system changes.
更に、上記した実施例のシステム構成に於いては分配系
ネットワーク単位でのシステムのバックアップ機能をも
つ。即ち、幹線路１３に何らかの障害が発生して、ヘッ
ドエンド１２からの信号伝送が停止した場合でも、衛星
放送信号は分配系ネットワーク１６に接続されている受
信者宅で受信可能である。これはＶ ＨＦ帯に於いても
同様のことが言える。Furthermore, the system configuration of the embodiment described above has a system backup function for each distribution network. That is, even if some failure occurs in the main line 13 and signal transmission from the head end 12 is stopped, the satellite broadcast signal can be received at the receiver's home connected to the distribution network 16. The same can be said for the VHF band.
〔発明の効果］
以上詳記したように本発明によれば、ヘッドエンドから
ＶＨＦ帯の信号が伝送される幹線路上に幹線分岐増幅器
を介在し、幹線分岐増幅器で分岐した信号を分配系ネッ
トワークを介し分配供給する共聴システムに於いて、上
記幹線分岐増幅器に対応して衛星放送受信アンテナを設
け、上記幹線分岐増幅器に、上記衛星放送受信アンテナ
のコンバータ出力信号を増幅する専用増幅器と、同増幅
器の出力信号と上記幹線路上のＶＨＦ帯の信号とを混合
し上記分配系ネットワークに出力する混合器とを設けて
なる構成としたことにより、経済的に有利な構成で各分
配供給先（受信者名）に１゜３Ｇ）＋２帯のＢＳ−ＩＦ
倍信号伝送でき、各分配供給先にてＢＳチューナを用い
てＰＣＭ音声による衛星放送を高忠実度再生できる。[Effects of the Invention] As described in detail above, according to the present invention, a trunk branch amplifier is interposed on the trunk line through which VHF band signals are transmitted from the head end, and the signals branched by the trunk branch amplifier are sent to the distribution network. In the public listening system, a satellite broadcast reception antenna is provided corresponding to the main branch amplifier, and the main branch amplifier includes a dedicated amplifier for amplifying the converter output signal of the satellite broadcast reception antenna, and the same amplifier. This configuration includes a mixer that mixes the output signal of the VHF band signal on the main line with the VHF band signal on the main line and outputs it to the distribution network. name) to 1°3G) + 2 band BS-IF
Double signal transmission is possible, and satellite broadcasting with PCM audio can be reproduced with high fidelity using a BS tuner at each distribution destination.
第１図は本発明の一実施例によるシステム構成を示すブ
ロック図、第２図は上記実施例に於ける幹線分岐増幅器
の構成を示すブロック図である。
１１・・・受信アンテナ、１２・・・ヘッドエンド、１
３・・・幹線路、１４．１４．・・・幹線分岐増幅器、
１５．１５．・・・衛星放送受信アンテナ、１５ａ・・
・コンバータ、１Ｇ・・・分配系ネットワーク、１７・
・・分岐増幅器、１８・・・タップオフ、１９・・・延
長増幅器、２１・・・衛星放送受信チューナ、２２・・
・テレビジョン受像機、２３・・・保安器、２４・・・
分配器、１４１・・・幹線増幅部、１４２・・・分配増
幅部、１４３・・・ＢＳ−ＩＦ増幅部、１４４・・・コ
ンバータ駆動電源、１４５・・・混合器、１４［ｆ・・
・分配器、ＶｌｌＦ−ＩＮ・・・幹線入力端、■肝−０
ＵＴ・・・幹線出力端、ＢＳ−Ｉ Ｐ−Ｉ Ｎ・・・Ｂ
Ｓ−ＩＦ信号専用入力端、Ｓ、・・・分岐端子。FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a trunk branch amplifier in the above embodiment. 11... Receiving antenna, 12... Head end, 1
3...Main road, 14.14. ...main branch amplifier,
15.15. ...Satellite broadcasting antenna, 15a...
・Converter, 1G...Distribution network, 17・
...Branch amplifier, 18...Tap-off, 19...Extension amplifier, 21...Satellite broadcast reception tuner, 22...
・Television receiver, 23...Safety device, 24...
Distributor, 141... Main line amplifier section, 142... Distribution amplifier section, 143... BS-IF amplifier section, 144... Converter drive power supply, 145... Mixer, 14 [f...
・Distributor, VllF-IN...Main line input terminal, ■Liver-0
UT...Main line output end, BS-I P-I N...B
S-IF signal dedicated input terminal, S,...branch terminal.
Claims (2)
幹線路上に幹線分岐増幅器を介在し、幹線分岐増幅器で
分岐した信号を分配系ネットワークを介し分配供給する
共聴システムに於いて、上記幹線分岐増幅器に対応して
衛星放送受信アンテナを設け、上記幹線分岐増幅器に、
上記衛星放送受信アンテナのコンバータ出力信号を増幅
する専用増幅器と、同増幅器の出力信号と上記幹線路上
のＶＨＦ帯の信号とを混合し上記分配系ネットワークに
出力する混合器とを設けてなることを特徴とする共聴シ
ステム。(1) In a public listening system, a trunk branch amplifier is interposed on the trunk line through which VHF band signals are transmitted from the head end, and the signals branched by the trunk branch amplifier are distributed and supplied via a distribution network. A satellite broadcast receiving antenna is provided corresponding to the branch amplifier, and the main branch amplifier is
A dedicated amplifier for amplifying the converter output signal of the satellite broadcast receiving antenna, and a mixer for mixing the output signal of the amplifier with the VHF band signal on the main line and outputting the mixture to the distribution network. Features a communal listening system.
記混合器で混合された信号を全帯域用の分岐又は延長増
幅器を介して分配供給する共聴システム。(2) A public listening system according to claim (1), in which the signal mixed by the mixer is distributed and supplied via a branch or extension amplifier for all bands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63167615A JP2573659B2 (en) | 1988-07-05 | 1988-07-05 | Shared listening system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63167615A JP2573659B2 (en) | 1988-07-05 | 1988-07-05 | Shared listening system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0217776A true JPH0217776A (en) | 1990-01-22 |
| JP2573659B2 JP2573659B2 (en) | 1997-01-22 |
Family
ID=15853069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63167615A Expired - Lifetime JP2573659B2 (en) | 1988-07-05 | 1988-07-05 | Shared listening system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573659B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526034A (en) * | 1990-09-28 | 1996-06-11 | Ictv, Inc. | Interactive home information system with signal assignment |
| US5530471A (en) * | 1993-10-30 | 1996-06-25 | Ant Nachrichtentechnik Gmbh | Radio and television distribution system |
| US5557316A (en) * | 1990-09-28 | 1996-09-17 | Ictv, Inc. | System for distributing broadcast television services identically on a first bandwidth portion of a plurality of express trunks and interactive services over a second bandwidth portion of each express trunk on a subscriber demand basis |
| US5680183A (en) * | 1992-03-12 | 1997-10-21 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US6205582B1 (en) | 1997-12-09 | 2001-03-20 | Ictv, Inc. | Interactive cable television system with frame server |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62159082U (en) * | 1986-03-31 | 1987-10-08 |
-
1988
- 1988-07-05 JP JP63167615A patent/JP2573659B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62159082U (en) * | 1986-03-31 | 1987-10-08 |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526034A (en) * | 1990-09-28 | 1996-06-11 | Ictv, Inc. | Interactive home information system with signal assignment |
| US5550578A (en) * | 1990-09-28 | 1996-08-27 | Ictv, Inc. | Interactive and conventional television information system |
| US5557316A (en) * | 1990-09-28 | 1996-09-17 | Ictv, Inc. | System for distributing broadcast television services identically on a first bandwidth portion of a plurality of express trunks and interactive services over a second bandwidth portion of each express trunk on a subscriber demand basis |
| US5680183A (en) * | 1992-03-12 | 1997-10-21 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US5897188A (en) * | 1992-03-12 | 1999-04-27 | Hitachi, Ltd. | Structure of liquid crystal display device with two driver circuit substrates partially superposed and connected by a flexible cable |
| US6195148B1 (en) | 1992-03-12 | 2001-02-27 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and easy disassembly |
| US6466282B2 (en) | 1992-03-12 | 2002-10-15 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US6856362B2 (en) | 1992-03-12 | 2005-02-15 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US7262822B2 (en) | 1992-03-12 | 2007-08-28 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US7359024B2 (en) | 1992-03-12 | 2008-04-15 | Hitachi, Ltd. | Structure of liquid crystal display device for easy assembly and disassembly |
| US5530471A (en) * | 1993-10-30 | 1996-06-25 | Ant Nachrichtentechnik Gmbh | Radio and television distribution system |
| US6205582B1 (en) | 1997-12-09 | 2001-03-20 | Ictv, Inc. | Interactive cable television system with frame server |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2573659B2 (en) | 1997-01-22 |
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