JPH02143620A - Same frequency of medium wave broadcast system - Google Patents
Same frequency of medium wave broadcast systemInfo
- Publication number
- JPH02143620A JPH02143620A JP29635688A JP29635688A JPH02143620A JP H02143620 A JPH02143620 A JP H02143620A JP 29635688 A JP29635688 A JP 29635688A JP 29635688 A JP29635688 A JP 29635688A JP H02143620 A JPH02143620 A JP H02143620A
- Authority
- JP
- Japan
- Prior art keywords
- station
- medium wave
- television
- broadcast
- transmitting
- 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
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 238000009434 installation Methods 0.000 abstract 1
- 230000005236 sound signal Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、各送信所から同時に同一周波数で同一番組
を放送する中波同一周波放送方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a medium wave same frequency broadcasting system in which the same program is simultaneously broadcast from each transmitting station on the same frequency.
第３図は従来の中波同一周波放送方式が適用された放送
システムのシステム構成図であり、図において、１は演
奏所、２は音声信号を伝送する伝送路、３は第１の送信
所、４は第２の送信所、５．６は中波送信アンテナ、７
はパイロット信号を伝送する伝送路である。Figure 3 is a system configuration diagram of a broadcasting system to which the conventional medium wave same frequency broadcasting system is applied. In the figure, 1 is a performance hall, 2 is a transmission line for transmitting audio signals, and 3 is a first transmitting station. , 4 is the second transmitting station, 5.6 is the medium wave transmitting antenna, 7
is a transmission path for transmitting pilot signals.
次に動作について説明する。演奏所１から伝送路２を介
して第１の送信所３に到達した音声信号は、第１の送信
所３において放送周波に変調され、増幅された後、中波
送信アンテナ５から、電波となって放送される。Next, the operation will be explained. The audio signal that has reached the first transmitting station 3 from the performance hall 1 via the transmission line 2 is modulated to a broadcast frequency at the first transmitting station 3 and amplified, and then transmitted from the medium wave transmitting antenna 5 to a radio wave. It will be broadcast.
一方、第１の送信所３に到達した音声信号と同一の音声
信号が第２の送信所４にも到達し、この第２の送信所４
で第１の送信所３が放送した電波と同一周波数の電波を
放送する。この時に、第１の送信所３および第２の送信
所４で、それぞれ独自の発振器を用いて搬送波を生成す
ると、それぞれの送信所３．４から放送された電波の周
波数がずれる可能性があり、ずれが生じるとラジオ受信
機でうなりを生じ音質が劣化する。On the other hand, the same audio signal as the audio signal that reached the first transmitting station 3 also reaches the second transmitting station 4, and the second transmitting station 4
The first transmitting station 3 broadcasts radio waves of the same frequency as the radio waves broadcast. At this time, if the first transmitting station 3 and the second transmitting station 4 each use their own oscillators to generate carrier waves, the frequencies of the radio waves broadcast from each transmitting station 3.4 may deviate. When a discrepancy occurs, a hum occurs in the radio receiver and the sound quality deteriorates.
そこで、第１の送信所３から有線あるいは無線の伝送路
７を介して第２の送信所４に、第１の送信所３で使用し
た周波数に関する周波数情報を含むパイロット信号を送
り、第２の送信所４ではこのパイロット信号に含まれた
周波数情報を抽出して搬送波を生成した後、この搬送波
を用いて変調、増幅して放送していた。Therefore, a pilot signal containing frequency information regarding the frequency used at the first transmitting station 3 is sent from the first transmitting station 3 to the second transmitting station 4 via a wired or wireless transmission path 7, and The transmitting station 4 extracted the frequency information contained in this pilot signal to generate a carrier wave, and then used this carrier wave to modulate, amplify, and broadcast.
（発明が解決しようとする課題）
従来の中波同一周波放送方式は以上のように構成されて
いるので、パイロット信号の発−生器、周波数情報を抽
出する抽出器等の装置を設けることが必要で、送信所３
．４の設備費が大きくなってしまうなどの課題があった
。(Problems to be Solved by the Invention) Since the conventional medium wave same frequency broadcasting system is configured as described above, it is not necessary to provide devices such as a pilot signal generator and an extractor for extracting frequency information. necessary, transmitting station 3
．． There were issues such as increased equipment costs for 4.
この発明は上記のような課題を解消するためになされた
もので、パイロット信号がなくても複数の送信所から放
送される電波の周波数がずれない中波同一周波放送方式
を得ることを目的とする。This invention was made to solve the above-mentioned problems, and its purpose is to obtain a medium-wave same-frequency broadcasting system in which the frequencies of radio waves broadcast from multiple transmitting stations do not deviate even in the absence of pilot signals. do.
この発明に係る中波同一周波放送方式は、テレビ中継局
受信所に中波受信アンテナを設け、この中波受信アンテ
ナで受信した第１の送信所から放送された信号を、テレ
ビ放送用ケーブルを使用してテレビ中継局送信所に伝送
し、テレビ中継局送信所に設けられた中波送信アンテナ
から信号を再送出するようにしたものである。In the medium wave same frequency broadcasting system according to the present invention, a medium wave receiving antenna is provided at a television relay station receiving station, and a signal broadcast from a first transmitting station received by the medium wave receiving antenna is transmitted to a television broadcasting cable. The signal is then transmitted to a television relay station transmitting station, and the signal is retransmitted from a medium wave transmitting antenna installed at the television relay station transmitting station.
この発明における中波同一周波放送方式は、第１の送信
所から放送された電波を受信して、この受信信号を復調
、変調せずにテレビ中継局送信所に設けられた中波送信
アンテナから放送することにより、周波数ずれかない中
波同一周波放送を可能にする。The medium wave same frequency broadcasting system in this invention receives radio waves broadcast from a first transmitting station, and sends the received signal from a medium wave transmitting antenna installed at a television relay station transmitting station without demodulating or modulating the received signal. By broadcasting, it becomes possible to broadcast medium waves at the same frequency without frequency deviation.
以下、この発明の一実施例を図について説明する。第１
図において、１は演奏所、２は音声信号を伝送する伝送
路、３は第１の送信所、５．６は中波送信アンテナで、
以上のものは従来のものと同一である。ただし、中波送
信アンテナ６は後述するテレビ中継局送信所に設けられ
ている。８は中波受信アンテナ、９．１１はテレビ信号
が通過するバイパス・フィルタ、１０．１２は中波域の
信号が通過するローパス・フィルタ、１３は中波域の信
号を増幅するリニア・アンプ、１４はテレビ中継局受信
所、１５はテレビ用の受信アンテナ、１６は同じく送信
アンテナ、１７はテレビ中継局送信所、１８はテレビ中
継局受信所１４とテレビ中継局送信所１７との間に設け
られたテレビ放送用ケーブルである。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a performance hall, 2 is a transmission line for transmitting audio signals, 3 is a first transmitting station, 5.6 is a medium wave transmitting antenna,
The above is the same as the conventional one. However, the medium wave transmitting antenna 6 is provided at a television relay station transmitting station, which will be described later. 8 is a medium wave receiving antenna, 9.11 is a bypass filter through which television signals pass, 10.12 is a low pass filter through which medium wave signals pass, 13 is a linear amplifier that amplifies medium wave signals. 14 is a TV relay station receiving station, 15 is a TV receiving antenna, 16 is also a transmitting antenna, 17 is a TV relay station transmitting station, and 18 is installed between the TV relay station receiving station 14 and the TV relay station transmitting station 17. This is a cable for television broadcasting.
次に動作について説明する。まず、演奏所１から伝送路
２を介して第１の送信所３に到達した音声信号は、第１
の送信所３において放送周波に変調され、増幅された後
、中波送信アンテナ５から電波となって放送される。Next, the operation will be explained. First, the audio signal that has arrived at the first transmitting station 3 from the performance hall 1 via the transmission line 2 is transmitted to the first transmitting station 3.
After being modulated to a broadcast frequency and amplified at a transmitting station 3, the signal is broadcast as a radio wave from a medium wave transmitting antenna 5.
この電波は、テレビ中継局受信所１４に設けられた中波
受信アンテナ８で受信される。この受信信号はテレビ中
継局受信所１４の内部のローパス・フィルタ１０で取り
出され、テレビ放送用ケーブル１８を通り、テレビ中継
局送信所１７の内部のローパス・フィルタ１２を通過し
た後、リニア・アンプ１３で増幅されて、中波送信アン
テナ６から放送される。This radio wave is received by a medium wave receiving antenna 8 provided at the television relay station receiving station 14. This received signal is extracted by a low-pass filter 10 inside the television relay station receiving station 14, passes through a television broadcasting cable 18, passes through a low-pass filter 12 inside the television relay station transmitting station 17, and then is sent to a linear amplifier. 13 and broadcast from the medium wave transmitting antenna 6.
一方、テレビ用電波はテレビ用の受信アンテナ１５で受
信された後、バイパス・フィルタ９、テレビ放送用ケー
ブル１８、バイパス・フィルタ１１およびテレビ用の送
信アンテナ１６の経路で中継される。On the other hand, the television radio waves are received by the television receiving antenna 15 and then relayed through the bypass filter 9, the television broadcasting cable 18, the bypass filter 11, and the television transmitting antenna 16.
このように、地理的な制約からテレビ中継局がテレビ中
継局受信所１４とテレビ中継局送信所１７とに分離して
いる場合には、これらを利用して第２の中波の送信所を
併設することができる。しかし、テレビ中継局が受信所
と送信所とに分離していない場合には、このテレビ中継
局に第２の送信所を併設すると、第１の送信所３から到
来する中波の電波は、第２の送信所から放送される電波
と干渉して、正確に受信できない場合がある。In this way, if the TV relay station is separated into the TV relay station receiving station 14 and the TV relay station transmitting station 17 due to geographical constraints, the second medium wave transmitting station can be established using these stations. Can be attached. However, if the television relay station is not separated into a receiving station and a transmitting station, and a second transmitting station is attached to this television relay station, the medium wave radio waves arriving from the first transmitting station 3 will be It may interfere with the radio waves broadcast from the second transmitting station, making it impossible to receive them accurately.
なお、上記実施例では、既設のテレビ中継局に第２の送
信所として必要な設備を併設して中波同一周波放送を実
現しているが、第２図に示すように、中波専用の受信所
１４ａを新たに設け、この受信所１４ａで第１の送信所
３から放送された電波を受信し、この受信信号を専用の
ケーブル１８ａを介して第２の送信所４に伝送し、この
第２の送信所４のリニア・アンプ１３で受信信号を増幅
して、中波送信アンテナ６から放送するようにしてもよ
い。In the above embodiment, the equipment required as a second transmitting station is attached to the existing television relay station to realize medium wave same frequency broadcasting, but as shown in Fig. 2, a medium wave dedicated A receiving station 14a is newly installed, and this receiving station 14a receives the radio waves broadcast from the first transmitting station 3, and transmits this received signal to the second transmitting station 4 via a dedicated cable 18a. The received signal may be amplified by the linear amplifier 13 of the second transmitting station 4 and then broadcast from the medium wave transmitting antenna 6.
〔発明の効果）
以上のように、この発明によれば、中波同一周波放送方
式を、テレビ中継局に第２の送信所に必要な設備を設け
て中波同一周波放送を行うようにしたので、第１の送信
所から第２の送信所に至る、周波数ずれを防止するため
のパイロット信号を不要にすることができ、また、設備
費も小さくすることができる効果がある。[Effects of the Invention] As described above, according to the present invention, the medium wave same frequency broadcasting method is implemented by providing the necessary equipment for the second transmitting station at the television relay station to perform medium wave same frequency broadcasting. Therefore, a pilot signal for preventing frequency shift from the first transmitting station to the second transmitting station can be made unnecessary, and the equipment cost can also be reduced.
第１図はこの発明の一実施例による中波同一周波放送方
式が適用された放送システムのシステム構成図、第２図
はこの発明の他の実施例を示すシステム構成図、第３図
は従来の中波同一周波放送方式が適用された放送システ
ムのシステム構成図である。
１は演奏所、３は第１の送信所、４は第２の送信所、５
．６は中波送信アンテナ、８は中波受信アンテナ、１４
はテレビ中継局受信所、１７はテレビ中継局送信所、１
８はテレビ放送用ケーブル。
なお、図中、同一符号は同一、又は相当部分を示す。
（外２名）Fig. 1 is a system configuration diagram of a broadcasting system to which a medium wave same frequency broadcasting system according to an embodiment of the present invention is applied, Fig. 2 is a system configuration diagram showing another embodiment of the invention, and Fig. 3 is a conventional system configuration diagram. 1 is a system configuration diagram of a broadcasting system to which a medium wave same frequency broadcasting system is applied. 1 is a performance hall, 3 is a first transmitting station, 4 is a second transmitting station, 5
．． 6 is a medium wave transmitting antenna, 8 is a medium wave receiving antenna, 14
is a TV relay station receiving station, 17 is a TV relay station transmitting station, 1
8 is a TV broadcasting cable. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others)
Claims (1)
る中波同一周波放送方式において、第１の送信所が放送
した電波をテレビ中継局受信所に設けられた中波受信ア
ンテナを受信し、この受信信号を前記テレビ中継局受信
所とテレビ中継局送信所との間に設けられたテレビ放送
用ケーブルを使用して、前記テレビ中継局送信所に伝送
した後、前記テレビ中継局送信所に設けられた中波送信
アンテナから前記受信信号を放送することを特徴とする
中波同一周波放送方式。In a medium wave same frequency broadcasting system in which multiple transmitting stations simultaneously broadcast the same program on the same frequency, a medium wave receiving antenna installed at a television relay station receiving station receives the radio waves broadcasted by the first transmitting station, This received signal is transmitted to the television relay station transmitting station using a television broadcasting cable installed between the television relay station receiving station and the television relay station transmitting station, and then sent to the television relay station transmitting station. A medium wave same frequency broadcasting system characterized in that the received signal is broadcast from a medium wave transmitting antenna provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29635688A JPH02143620A (en) | 1988-11-25 | 1988-11-25 | Same frequency of medium wave broadcast system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29635688A JPH02143620A (en) | 1988-11-25 | 1988-11-25 | Same frequency of medium wave broadcast system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02143620A true JPH02143620A (en) | 1990-06-01 |
Family
ID=17832491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29635688A Pending JPH02143620A (en) | 1988-11-25 | 1988-11-25 | Same frequency of medium wave broadcast system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02143620A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668695A (en) * | 1995-03-03 | 1997-09-16 | International Business Machines Corp. | Portable computer utilizable by an over head projector and tilting mechanism thereof |
-
1988
- 1988-11-25 JP JP29635688A patent/JPH02143620A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668695A (en) * | 1995-03-03 | 1997-09-16 | International Business Machines Corp. | Portable computer utilizable by an over head projector and tilting mechanism thereof |
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