JPS6113431B2 - - Google Patents
Info
- Publication number
- JPS6113431B2 JPS6113431B2 JP53078634A JP7863478A JPS6113431B2 JP S6113431 B2 JPS6113431 B2 JP S6113431B2 JP 53078634 A JP53078634 A JP 53078634A JP 7863478 A JP7863478 A JP 7863478A JP S6113431 B2 JPS6113431 B2 JP S6113431B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- television
- signal
- channel
- microwave band
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 230000005236 sound signal Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/10—Intermediate station arrangements, e.g. for branching, for tapping-off
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Details Of Television Systems (AREA)
Description
【発明の詳細な説明】
本発明はマイクロ波帯チヤネルを介してテレビ
ジヨン信号を中継伝送するテレビジヨン信号中継
伝送方式に関し、特に周波数変調されたテレビジ
ヨン信号を中継伝送するテレビジヨン信号中継伝
送方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television signal relay transmission system that relays and transmits television signals via a microwave band channel, and particularly relates to a television signal relay transmission system that relays and transmits frequency-modulated television signals. Regarding.
現在、テレビジヨン信号をマイクロ波帯におい
て中継伝送するために割り当てられている周波数
多重分割による１チヤネルは、電波法の規定する
ところに従い、25MHzである。ただし6GHzのマ
イクロ波帯では24MHz、3.5GHzのマイクロ波帯
では20MHzである。 Currently, one frequency multiplexing channel allocated for relay transmission of television signals in the microwave band is 25 MHz, as stipulated by the Radio Law. However, it is 24MHz in the 6GHz microwave band and 20MHz in the 3.5GHz microwave band.
従来のマイクロ波帯チヤネルを介するテレビジ
ヨン信号の中継伝送は、伝送されるべきテレビジ
ヨン信号のＳ／Ｎ比、微分利得（DG）、微分位相
（DP）等の伝送特性を劣化させないようにするた
め、第１図ａに示すような周波数配置図に従つて
いる。即ち周波数変調されたテレビジヨン信号が
第３チヤネル３全領域を占有するように挿入さ
れ、しかもその下の第２チヤネル２及びその上の
第４チヤネル４はガード用として空チヤネルにさ
れる。 Relay transmission of television signals via conventional microwave band channels must be done in such a way that transmission characteristics such as S/N ratio, differential gain (DG), differential phase (DP), etc. of the television signals to be transmitted are not degraded. Therefore, the frequency map shown in FIG. 1a is followed. That is, a frequency-modulated television signal is inserted so as to occupy the entire area of the third channel 3, and the second channel 2 below it and the fourth channel 4 above it are made empty channels for guard purposes.
この場合、音声信号搬送波は例えば周波数
7.5MHzで伝送されるため、マイクロ波中継局か
らサテライトテレビジヨン局への受渡しは、一旦
周波数7.5MHzの音声信号搬送波を音声信号に変
換し、再度標準方式の4.5MHz音声信号搬送波に
変換する処理がなされる。 In this case, the audio signal carrier is e.g.
Since it is transmitted at 7.5MHz, the transmission from the microwave relay station to the satellite television station requires the process of first converting the 7.5MHz audio signal carrier into an audio signal, and then converting it back to the standard 4.5MHz audio signal carrier. will be done.
このことから明らかなように、従来のテレビジ
ヨン信号伝送方式によれば、マイクロ波帯のチヤ
ネル利用効率が低く、音声信号にあつては伝送途
上においての品質の劣化が大きいという欠点があ
つた。 As is clear from this, the conventional television signal transmission system has the drawbacks of low channel utilization efficiency in the microwave band and large deterioration of quality during transmission of audio signals.
本発明は、前述したような従来の欠点を除去す
るためになされたものであり、マイクロ波帯チヤ
ネルの利用効率が高く、かつ改善された伝送特性
を有すると共に低価格で実現され得るテレビジヨ
ン信号中継伝送方式を提供することを目的とす
る。 The present invention has been made in order to eliminate the conventional drawbacks as described above, and provides a television signal that has high utilization efficiency of a microwave band channel, has improved transmission characteristics, and can be realized at a low cost. The purpose is to provide a relay transmission method.
本発明のテレビジヨン信号中継伝送方式は、標
準方式による複数のテレビジヨン信号が挿入され
るマイクロ波帯１チヤネルにおいて周波数分割多
重に対応して選択された中心周波数を有する中間
周波数でそれぞれ周波数変調され、周波数変調さ
れた複数のテレビジヨン信号はそれぞれ帯域波
器で定められた帯域内の信号にされた後一つの合
成器に入力され、中間周波数において合成された
一つの周波数分割多重信号にされ、更に与えられ
たマイクロ波帯チヤネルの周波数に変換されてこ
のチヤネルに挿入、即ち送出される。受信は前述
と逆の処理となる。即ち、あるマイクロ波帯チヤ
ネルに挿入された複数のテレビジヨン信号は受信
されると、まず中間周波数に変換される。この中
間周波数における周波数分割多重化された複数の
テレビジヨン信号は分配器に入力され、その出力
はそれぞれ中心周波数を異にする二つの帯域波
器に入力される。ここで選択された各中間周波数
のテレビジヨン信号は次に周波数復調器にそれぞ
れ入力されて標準方式の二つのテレビジヨン信号
に変換される。 In the television signal relay transmission system of the present invention, in one microwave band channel into which a plurality of standard television signals are inserted, each channel is frequency-modulated with an intermediate frequency having a center frequency selected in accordance with frequency division multiplexing. A plurality of frequency-modulated television signals are each converted into a signal within a predetermined band by a band waver, and then inputted into a single synthesizer to form one frequency division multiplexed signal synthesized at an intermediate frequency, Furthermore, it is converted to the frequency of a given microwave band channel and inserted into this channel, that is, sent out. Reception is the reverse process to the above. That is, when a plurality of television signals inserted into a certain microwave band channel are received, they are first converted to an intermediate frequency. A plurality of frequency division multiplexed television signals at this intermediate frequency are input to a distributor, and the output thereof is input to two band wavers having different center frequencies. The television signals of each intermediate frequency selected here are then respectively input to a frequency demodulator and converted into two standard television signals.
以下、第２図に示す本発明によるテレビジヨン
信号中継伝送方式の一実施例である中継伝送装置
のブロツク図及び第３図に示す本発明のマイクロ
波帯チヤネルにおける周波数配置図を参照して説
明する。 The following description will be made with reference to a block diagram of a relay transmission device, which is an embodiment of the television signal relay transmission system according to the present invention, shown in FIG. 2, and a frequency allocation diagram in a microwave band channel of the present invention shown in FIG. do.
音声信号A1は音声FM変調器１ａに入力され、
その出力は周波数変調された音声信号搬送波ＦA1
となり、振幅変調された映像信号ｆV1と共に標準
方式のベースバンドテレビジヨン信号としてFM
変調器２ａに入力される。FM変調器２ａはテレ
ビジヨン信号をFM変調された中間周波数に変換
し、その出力は帯域波器３ａに入力される。テ
レビジヨン信号が中間周波数において必要とする
帯域幅Ｂは次の式で与えられる。 The audio signal A 1 is input to the audio FM modulator 1a,
Its output is a frequency modulated audio signal carrier F A1
FM as a standard baseband television signal together with the amplitude modulated video signal fV1 .
The signal is input to the modulator 2a. The FM modulator 2a converts the television signal into an FM modulated intermediate frequency, and its output is input to the bandpass filter 3a. The bandwidth B required by the television signal at the intermediate frequency is given by the following equation.
Ｂ＝２（Δｆ＋fm） ……(1)
ただし、Δｆは周波数偏多、fmは最高被変調
周波数である。この場合、映像信号ｆV1及び音声
信号搬送波ｆA1は標準方式によるものであり、そ
の最高被変調周波数は4.5MHzである。また第３
図に示すようにマイクロ波帯における１チヤネル
当りの帯域幅を24MHzとし、第３チヤネル３に
テレビジヨン信号が２チヤネル挿入される場合を
説明すると、テレビジヨン信号の中心周波数F1
及びF2の間隔は12MHzで、これらテレビジヨン
信号はそれぞれ11MHzの帯域を有している。従
つて、第１式によつて周波数偏移Δｆは
2MHzP-Pである。 B=2(Δf+fm)...(1) However, Δf is the frequency deviation, and fm is the highest modulated frequency. In this case, the video signal f V1 and the audio signal carrier f A1 are based on the standard method, and their highest modulated frequency is 4.5 MHz. Also the third
As shown in the figure, the bandwidth per channel in the microwave band is 24 MHz, and two channels of television signals are inserted into the third channel 3. The center frequency of the television signal F 1
and F 2 are spaced at 12 MHz, and each of these television signals has a band of 11 MHz. Therefore, according to the first equation, the frequency deviation Δf is
2MHz PP .
波器３ａは周波数変調された中間周波数で、
帯域幅11MHzのテレビジヨン信号を出力し、こ
の信号を合成器４に入力する。合成器４は二つの
入力を有し、他方の入力は前述の第１のテレビジ
ヨン信号と同じように処理された第２のテレビジ
ヨン信号であり、このために音声FM変調器１
ａ、FM変調器２ａより周波数12MHzだけ高い周
波数で周波数変調するFM変調器１ｂ及びFM変
調器２ｂの周波数に対応した11MHzの帯域を有
する帯域波器３ｂを備えている。 The wave generator 3a is a frequency modulated intermediate frequency,
A television signal with a bandwidth of 11 MHz is output, and this signal is input to the synthesizer 4. The synthesizer 4 has two inputs, the other input being a second television signal processed in the same way as the first television signal described above, for which the audio FM modulator 1
a, an FM modulator 1b that performs frequency modulation at a frequency 12 MHz higher than that of the FM modulator 2a, and a band waver 3b having a band of 11 MHz corresponding to the frequency of the FM modulator 2b.
合成器４は中間周波数において周波数分割多重
された第１及び第２のテレビジヨン信号を出力
し、これら信号は送信周波数変換器５に入力さ
れ、第３図に示すマイクロ波帯の第３チヤネルの
信号に変換されてアンテナ６より送出される。 The synthesizer 4 outputs first and second television signals that are frequency division multiplexed at the intermediate frequency, and these signals are input to the transmission frequency converter 5, which converts the third channel of the microwave band shown in FIG. The signal is converted into a signal and sent from the antenna 6.
送出されたマイクロ波帯のテレビジヨン信号は
アンテナ７によつて受信され、その出力は受信周
波数変換器８に入力され、ここで中間周波数のテ
レビジヨン信号に変換される。受信周波数変換器
８の出力は分配器９に入力され、分配器９は同一
の二つの出力をそれぞれ帯域波器１０ａ及び１
０ｂに与える。帯域波器１０ａは中間周波数に
ある第１のテレビジヨン信号を選択出力し、同様
に帯域波器１０ｂは中間周波数にある第２のテ
レビジヨン信号を選択出力する。これら第１及び
第２のテレビジヨン信号はそれぞれFM復調器１
１ａ及び１１ｂに入力され、こで標準方式のテレ
ビジヨン信号を得て、FM復調器１１ａは映像信
号搬送波ｆA1及び音声信号搬送波ｆV1、またFM
変調器１１ｂは映像信号搬送波ｆA2及び音声信号
搬送波ｆV2をそれぞれ出力する。 The transmitted microwave band television signal is received by antenna 7, and its output is input to reception frequency converter 8, where it is converted into an intermediate frequency television signal. The output of the reception frequency converter 8 is input to a distributor 9, and the distributor 9 sends the same two outputs to bandpass filters 10a and 1, respectively.
Give to 0b. Bandwidth converter 10a selectively outputs a first television signal at an intermediate frequency, and similarly bandpass converter 10b selectively outputs a second television signal at an intermediate frequency. These first and second television signals are sent to an FM demodulator 1, respectively.
1a and 11b, where a standard television signal is obtained, and the FM demodulator 11a outputs a video signal carrier f A1 and an audio signal carrier f V1 , as well as an FM
The modulator 11b outputs a video signal carrier wave f A2 and an audio signal carrier wave f V2 , respectively.
本発明におけるテレビジヨン信号伝送方式で得
られるＳ／Ｎ比の改善度ＩFMは次式で与えられ
る。 The degree of improvement in the S/N ratio I FM obtained by the television signal transmission system according to the present invention is given by the following equation.
ＩFM＝３（Δｆ／ｆｍ）２Ｂ／ｆｍ……(2
)
周波数偏移Δｆを2MHzとすれば、改善度ＩFM
は約−1dBとなる。 I FM = 3 (Δf/fm) 2 B/fm...(2
) If the frequency deviation Δf is 2MHz, the degree of improvement I FM
is approximately -1dB.
マイクロ波帯チヤネルが周波数変調された本発
明によれば、同様な周波数配置による従来の振幅
変調によるものとを比較しても6dBの改善が得ら
れる。 According to the present invention, in which the microwave band channel is frequency modulated, an improvement of 6 dB can be obtained compared to conventional amplitude modulation using a similar frequency arrangement.
以上説明したごとく、本発明によれば、テレビ
ジヨン信号のマイクロ波帯チヤネルを介しての中
継伝送は、まず送信において二つの標準方式のテ
レビジヨン信号をそれぞれ中間周波帯において周
波数変調した後、周波数分割多重化し、更に所望
のマイクロ波帯チヤネルの周波数に変換して送出
され、次に受信において送信と逆の処理、即ちマ
イクロ波帯チヤネルの周波数から中間周波数、そ
して標準の二つのテレビジヨン信号へ変換される
ように行なわれることから明らかなように、本発
明は次の効果を有する。 As explained above, according to the present invention, relay transmission of television signals via a microwave band channel is achieved by first frequency modulating the two standard television signals in the intermediate frequency band, and then frequency modulating the television signals in the intermediate frequency band. The signals are divided and multiplexed, further converted to the frequency of the desired microwave band channel, and then sent out.Then, at reception, the processing is the reverse of that of transmission, that is, from the microwave band channel frequency to an intermediate frequency, and then to two standard television signals. As is clear from the conversion, the present invention has the following effects.
即ち、マイクロ波中継局からテレビジヨンサテ
ライト中継局への接続の際、音声信号搬送波の変
換装置を必要とすることなく接続ができ、中継伝
送装置の構成が簡単にできる。 That is, when connecting a microwave relay station to a television satellite relay station, the connection can be made without requiring an audio signal carrier conversion device, and the structure of the relay transmission device can be simplified.
また、マイクロ波帯チヤネルへテレビジヨン信
号を挿入するための処理及び分波するための処理
はいずれも取り扱いの容易な中間周波帯で行なわ
れるため、損失が小さく、かつ、増幅も容易であ
る。 Further, since the processing for inserting the television signal into the microwave band channel and the processing for demultiplexing the television signal are both performed in an easily handled intermediate frequency band, loss is small and amplification is easy.
更に、マイクロ波帯における周波数変換器は送
受信共に一系統で二つのテレビジヨン信号が処理
でき、中継伝送装置の構成が簡単にでき、このた
め、この処理におけるマイクロ波電力の損失を小
さくすることができる。 Furthermore, the frequency converter in the microwave band can process two television signals in one system for both transmission and reception, making it possible to easily configure the relay transmission equipment, and thus reducing the loss of microwave power during this processing. can.
更に、マイクロ波帯チヤネルの利用効率を高め
ることができ、しかも高品質の周波数変調による
中継伝送ができる。 Furthermore, it is possible to increase the utilization efficiency of the microwave band channel, and moreover, it is possible to perform relay transmission using high-quality frequency modulation.
従つて、前述のことから、本発明は簡単にして
低価格の中継伝送装置を構成することができる。 Therefore, from the foregoing, the present invention allows a simple and low-cost relay transmission device to be constructed.
第１図は従来の周波数変調によるテレビジヨン
信号をマイクロ波帯チヤネルに挿入した周波数配
置図、第２図は本発明のテレビジヨン信号伝送方
式による一実施例である中継伝送装置のブロツク
図、第３図は本発明の第１図に対応する周波数配
置図。
１ａ，１ｂ……音声FM変調器、２ａ，２ｂ…
…FM変調器、３ａ，３ｂ，１０ａ，１０ｂ……
帯域波器、４……合成器、５……送信周波数変
換器、６，７……アンテナ、８……受信周波数変
換器、９……分配器、１１ａ，１１ｂ……FM復
調器。
FIG. 1 is a frequency allocation diagram in which a television signal based on conventional frequency modulation is inserted into a microwave band channel, FIG. FIG. 3 is a frequency allocation diagram corresponding to FIG. 1 of the present invention. 1a, 1b...Audio FM modulator, 2a, 2b...
...FM modulator, 3a, 3b, 10a, 10b...
Bandwidth wave device, 4...Synthesizer, 5...Transmission frequency converter, 6, 7...Antenna, 8...Reception frequency converter, 9...Distributor, 11a, 11b...FM demodulator.
Claims (1)
された信号としてテレビジヨン信号が中継伝送さ
れるテレビジヨン中継伝送方式において、与えら
れた１つの前記チヤネルに対する周波数分割多重
による複数のテレビジヨン信号の挿入が、前記テ
レビジヨン信号をそれぞれ前記周波数分割多重に
対応して選択された中心周波数を有する中間周波
数でそれぞれ周波数変調された後合成され、次い
で前記チヤネルの周波数に変換されてなされるこ
とを特徴とするテレビジヨン信号中継伝送方式。1. In a television relay transmission system in which a television signal is relay-transmitted as a frequency-modulated signal in a microwave band channel, insertion of a plurality of television signals by frequency division multiplexing into a given channel is performed as described above. A television characterized in that the television signals are each frequency-modulated with an intermediate frequency having a center frequency selected corresponding to the frequency division multiplexing, then combined, and then converted to the frequency of the channel. Signal relay transmission method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7863478A JPS556910A (en) | 1978-06-30 | 1978-06-30 | Repeating transmission system for television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7863478A JPS556910A (en) | 1978-06-30 | 1978-06-30 | Repeating transmission system for television signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS556910A JPS556910A (en) | 1980-01-18 |
| JPS6113431B2 true JPS6113431B2 (en) | 1986-04-14 |
Family
ID=13667293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7863478A Granted JPS556910A (en) | 1978-06-30 | 1978-06-30 | Repeating transmission system for television signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS556910A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03104920U (en) * | 1990-02-15 | 1991-10-30 |
-
1978
- 1978-06-30 JP JP7863478A patent/JPS556910A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03104920U (en) * | 1990-02-15 | 1991-10-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS556910A (en) | 1980-01-18 |
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