JPS61141287A - Information transmission system utilizing polot signal in catv system - Google Patents
Information transmission system utilizing polot signal in catv systemInfo
- Publication number
- JPS61141287A JPS61141287A JP59263048A JP26304884A JPS61141287A JP S61141287 A JPS61141287 A JP S61141287A JP 59263048 A JP59263048 A JP 59263048A JP 26304884 A JP26304884 A JP 26304884A JP S61141287 A JPS61141287 A JP S61141287A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pilot signal
- pilot
- level
- information
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はＣＡＴＶシステムにおけるパイロット信号を搬
送波として利用して情報信号を伝送するようにした情報
伝送方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information transmission method in which an information signal is transmitted using a pilot signal as a carrier wave in a CATV system.
（従来の技術）
ＣＡＴＶシステムでは伝送損失を補償するためヘッドエ
ンドから一定レベルでパイロット信号を送り、この信号
により幹線増幅器のＡＧＣを動作させて出力を一定に保
つようにしている。(Prior Art) In a CATV system, in order to compensate for transmission loss, a pilot signal is sent from the head end at a constant level, and this signal operates the AGC of the main amplifier to keep the output constant.
（発明が解決しようとする問題点）
従来のＣＡＴＶシステムではパイロット信号は単にＡＧ
Ｃ動作にしか使用されていないため、せっかくの信号が
有効に活用し切れていないきらいがあった。(Problem to be solved by the invention) In the conventional CATV system, the pilot signal is simply an AG signal.
Since it was only used for C operation, there was a feeling that the precious signal was not fully utilized.
（問題点を解決するための手段）
本発明はパイロット信号を単にＡＧＣ動作に使用するだ
けでなく、情報信号伝送用の搬送波としても使用するよ
うにしたものである。(Means for Solving the Problems) According to the present invention, a pilot signal is not only used for AGC operation, but also used as a carrier wave for information signal transmission.
そのため本発明型は例えば、緊急放送用信号、ＢＧＭ用
信号、増幅器制御用信号といった客積の情報信号を、パ
イロット信号にのせて伝送するようにしたものである。Therefore, the type of the present invention transmits customer information signals, such as emergency broadcast signals, BGM signals, and amplifier control signals, on top of pilot signals.
（作 用）
パイロット信号にのせられた情報信号は各加入者宅まで
伝送され、夫々の加入者宅の端末機で復調されて受信さ
れる。(Operation) The information signal carried on the pilot signal is transmitted to each subscriber's house, demodulated and received by the terminal at each subscriber's house.
なお、パイロット信号は従来通りＡＧＣ増幅器で取り出
されて使用される。Note that the pilot signal is extracted by the AGC amplifier and used as before.
（実 施 例）
情報信号をパイロット信号にのせるには１例えば図に示
すヘッドエンド１内の信号発生器の代りにパイロット信
号と同じ周波数（２４６ＭＨｚ）のＦＭ変調器を使用し
、これによりパイロット信−号をＦＭ変調する。ＦＭ変
調の場合はパイロット信号がレベル変動しないため、パ
イロット信号はＡＧＣ信号として使用するのに支障がな
い。(Example) To put an information signal on a pilot signal 1. For example, instead of the signal generator in the head end 1 shown in the figure, an FM modulator with the same frequency as the pilot signal (246 MHz) is used. FM modulates the signal. In the case of FM modulation, the level of the pilot signal does not change, so there is no problem in using the pilot signal as an AGC signal.
なお、図において２は幹線増幅器、３は端末器である。In the figure, 2 is a trunk amplifier, and 3 is a terminal device.
（発明の効果）
本発明は以上のように、情報信号をパイロット信号にの
せて伝送するようにしたものであるため次のような各種
効果がある。(Effects of the Invention) As described above, the present invention is configured to transmit an information signal on a pilot signal, and therefore has the following various effects.
（１）パイロット信号を有効に活用することができる。(1) Pilot signals can be used effectively.
（２）通常であれば情報信号を伝送するにはパイロット
信号の他に別途搬送波が必要となるが、本発明ではその
必要がないため、その分だけ送信設備が簡潔になる。(2) Normally, in order to transmit an information signal, a separate carrier wave is required in addition to the pilot signal, but in the present invention, this is not necessary, so the transmission equipment becomes simpler.
（３）パイロット信号にのせて伝送する情報信号の内容
を必要に応じて適宜選定すれば、その情報を各種用途に
使用することができる。(3) If the content of the information signal to be transmitted on the pilot signal is appropriately selected as necessary, the information can be used for various purposes.
（４）各加入者の受信機塁も格別なものを必要とせず、
従来の告知放送受信用端末機の受信周波数を変えるだけ
で使用することができる。(4) Each subscriber's receiver base does not require anything special;
It can be used by simply changing the receiving frequency of a conventional announcement broadcast receiving terminal.
（５）システムの構成が簡潔であるため実用化が容易で
ある。(5) Since the system configuration is simple, it is easy to put it into practical use.
図は本発明を実施化する場合の概略説明図である。 １はヘッドエンド ２は幹線増幅器 ３は端末器 The figure is a schematic explanatory diagram for implementing the present invention. 1 is the head end 2 is the main amplifier 3 is the terminal
Claims (1)
ロット信号にのせて伝送するようにしたことを特徴とす
るＣＡＴＶシステムにおけるパイロット信号利用の情報
伝送方法。An information transmission method using a pilot signal in a CATV system, characterized in that the information signal is transmitted on top of the pilot signal so that the pilot signal does not fluctuate in level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59263048A JPS61141287A (en) | 1984-12-14 | 1984-12-14 | Information transmission system utilizing polot signal in catv system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59263048A JPS61141287A (en) | 1984-12-14 | 1984-12-14 | Information transmission system utilizing polot signal in catv system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61141287A true JPS61141287A (en) | 1986-06-28 |
Family
ID=17384134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59263048A Pending JPS61141287A (en) | 1984-12-14 | 1984-12-14 | Information transmission system utilizing polot signal in catv system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61141287A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5310917A (en) * | 1976-07-19 | 1978-01-31 | Hitachi Ltd | Picture and sound transmission system |
-
1984
- 1984-12-14 JP JP59263048A patent/JPS61141287A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5310917A (en) * | 1976-07-19 | 1978-01-31 | Hitachi Ltd | Picture and sound transmission system |
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