JPS62237874A - Voice transmission system - Google Patents
Voice transmission systemInfo
- Publication number
- JPS62237874A JPS62237874A JP61081289A JP8128986A JPS62237874A JP S62237874 A JPS62237874 A JP S62237874A JP 61081289 A JP61081289 A JP 61081289A JP 8128986 A JP8128986 A JP 8128986A JP S62237874 A JPS62237874 A JP S62237874A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- ssb
- subcarrier
- video
- audio
- 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 title claims description 9
- 230000005236 sound signal Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000010356 wave oscillation Effects 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はテレビジョン中継装置における音声信号伝送方
式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio signal transmission system in a television relay device.
［従来の技術］
従来、１つの映像信号と２以上の音声信号（データ信号
をＳむ）とを伝送するマイクロ波を用いたテレビジョン
信号伝送機器において、音声信号は副搬送波をもうけ、
音声信号にてその副搬送波をＦＭ変調しＦＭ変調された
副搬送波を映像信号に多重し、映像十副搬送波でマイク
ロ波を変調することにより信号の伝送を行っていた。こ
の場合、通常は一つの副搬送波に対し一つの音声プログ
ラムであるが、複数の音声プログラム又はデータ信号を
伝送する場合は次のような方法がとられていた。[Prior Art] Conventionally, in television signal transmission equipment using microwaves to transmit one video signal and two or more audio signals (including data signals), the audio signal has a subcarrier,
The signal was transmitted by FM modulating the subcarrier with the audio signal, multiplexing the FM modulated subcarrier onto the video signal, and modulating the microwave with the video subcarrier. In this case, normally one audio program is transmitted to one subcarrier, but when transmitting multiple audio programs or data signals, the following method has been used.
［発明が解決しようとする問題点コ
主音声プログラムは少くとも１０に１１２〜１２ ＫＩ
ＩＺの帯域を必要とする。そこで、送信側では第２のプ
ログラム、又はデータ信号はこの上側の帯域を使って伝
送する方法がとられていた。即ち第２図（ａ）に示すよ
うに２０に１１２〜３０ ＫＩＩＺの帯域を使用し、３
３Ｂ変調のためのクリスタル搬送波発振５５ａを用い、
ＳＳＢ変調器４に第２の音声信号を入力してＳＳＢ変調
（単側波帯変調〉信号を得て、そのＳＳＢ変調信号及び
第１音声信号により副搬送波変調″Ｂ３にて変調し副搬
送波を変調する方式がとられている。１は映像＋副搬送
波の変調器、２はマイクロ波増巾器である。この方式の
場合、中継装置の非直線性のためテレビ同期信号１５．
７５ＫｌｌＺ及びその高調波成分が歪として音声帯域内
におちこんでくるため、１５．７５Ｋｔｌｚとその整数
倍と、その近傍は第２音声又はデータのプログラム伝送
には使用できなかった。したがって、この従来方式の場
合は上述の如＜２０にＨ２〜３０にＨ２程度の帯域しか
使用されなかった。[Problems to be solved by the invention The main audio program must be at least 10 to 112 to 12 KI
Requires IZ band. Therefore, on the transmitting side, a method has been adopted in which the second program or data signal is transmitted using this upper band. That is, as shown in Fig. 2(a), the band of 112 to 30 KIIZ is used for 20,
Using crystal carrier wave oscillation 55a for 3B modulation,
A second audio signal is input to the SSB modulator 4 to obtain an SSB modulation (single sideband modulation) signal, and the SSB modulation signal and the first audio signal are used to modulate the subcarrier modulation "B3" to generate a subcarrier. A modulation method is used. 1 is a video + subcarrier modulator, and 2 is a microwave amplifier. In this method, due to the nonlinearity of the repeater, the TV synchronization signal 15.
Since 75KllZ and its harmonic components fall into the audio band as distortion, 15.75Ktlz, integral multiples thereof, and their vicinity could not be used for program transmission of second audio or data. Therefore, in the case of this conventional method, only a band of about H2 was used for H2 to H30, as described above.
又第２図（ｂ）に示すように受信側は映像士副搬送波復
調器６．音声十ＳＳＢ信号復調器７．第１音声信号のみ
を通過させるローパスフィルタ８゜ＳＳＢ復調器１０と
ＳＳＢ信号の復調用として送信側のＳＳＢのためのキャ
リアと同じキャリアを発生させるための発振器９ａとを
有する。この発振器９ａとしては一般的には水晶（クリ
スタル）発振器が用いられるため、復調側Ｃの歪を少く
する上で安定度の高い高価な水晶発振器を使用しなけれ
ばならなかった。Further, as shown in FIG. 2(b), the receiving side includes a video subcarrier demodulator 6. Audio SSB signal demodulator7. It has a low-pass filter 8° SSB demodulator 10 that allows only the first audio signal to pass through, and an oscillator 9a that generates the same carrier as the carrier for SSB on the transmitting side for demodulating the SSB signal. Since a crystal oscillator is generally used as the oscillator 9a, it is necessary to use an expensive crystal oscillator with high stability in order to reduce distortion on the demodulation side C.
本発明の目的は水晶発振器を用いずに安定した第２の音
声信号を得る音声伝送方式を提供することにある。An object of the present invention is to provide an audio transmission system that obtains a stable second audio signal without using a crystal oscillator.
［問題点を解決するための手段］
本発明はデータ信号を含めた２以上の音声信号のうら第
１番目の音声信号に、第２番目以下の音声又はデータ信
号をＳＳＢ方式にて変調して重畳し、重畳した信号で副
搬送波を変調し、副搬送波を映像信号に多重して伝送す
る音声伝送方式において、ＳＳＢ方式の変調或いは復調
に必要な搬送波を、映像信号のうちの映像同期信号に同
期させることを特徴とする音声伝送方式である。[Means for Solving the Problems] The present invention modulates the second and subsequent audio or data signals into the first audio signal of two or more audio signals including a data signal using the SSB method. In an audio transmission method that modulates a subcarrier with the superimposed signal and multiplexes the subcarrier with a video signal and transmits it, the carrier wave required for modulation or demodulation of the SSB method is added to the video synchronization signal of the video signal. This is an audio transmission method characterized by synchronization.
［原理・作用］
ＳＳＢ変調のため必要なキャリア（搬送波）の発振器は
ＬＣ又はＲＣのフリーランニング発振器とし、これに外
部より映像の同期信号にて注入同期をかＣノ、全く同一
の周波数とする。一方、復調側では映像復調器にて復調
された映像信号より同期信号のみをとり出し、送信側と
同じくこの同期信号にてフリーランニング発振器を注入
同期する。[Principle/Function] The carrier (carrier wave) oscillator required for SSB modulation is an LC or RC free-running oscillator, and injection locking is applied to this using an external video synchronization signal. . On the demodulation side, on the other hand, only the synchronization signal is extracted from the video signal demodulated by the video demodulator, and the free-running oscillator is injection-locked with this synchronization signal in the same way as on the transmission side.
これにより送信側と全く同一のキャリアを再現すること
が可能となる。このキャリアを用いＳＳＢ信号を復調し
、第２の音声信号を得る。This makes it possible to reproduce exactly the same carrier as on the transmitting side. The SSB signal is demodulated using this carrier to obtain a second audio signal.
以上に説明した同期信号、とは音声信号と共に伝送され
る映像信号の内の同期信号で、同期分離回路により映像
信号より得なければならない。The synchronization signal described above is a synchronization signal of the video signal transmitted together with the audio signal, and must be obtained from the video signal by a synchronization separation circuit.
［実施例］
次に、本発明の一実施例について図面を参照して説明す
る。第１図（ａ）、 （ｂ）は本発明の一実施例の系統
図である。第１図（ａ）は送信側の構成を示すもので、
１は映像十副搬送波のＦＭ変調器である。そのＦＭ変調
器１の出力はマイクロ波電力増巾器２を経て出力される
。入力の映像信号の一部は同期分離器１１に供給され、
入ノコの同期信号に同期した１５．７５ＫＩＩＺの信号
を得ることが出来、この同期信号にて発振器５ｂを同期
させる。このＳＳＢ変調のために必要なキャリア（搬送
波）の発振器５ｂはＬＣ又はＲＣのフリーランニング発
振器として構成しである。第２番目の音声信号はＳＳＢ
変調器４に加えられ、上側の側波帯を使用したＳＳＢ変
調信号を１９る。ただし、１５．７５にＩＩＺの２倍に
同期させる場合は下側の側波帯を使用する。こうして得
られたＳＳＢ信号は第１番目の音声信号とともに副搬送
波変調器３にてＦＭ変調する。このようにして送信側は
第２音声信号を変調する。第１図（ｂ）に示すように、
受信側は映像＋副搬送波復調器６より映像信号と副搬送
波とを得る。一方、副搬送波を音声＋ＳＳＢ信号復調器
７にて復調することにより第１番目の音声信号と、第２
番目の音声信号によりＳＳＢ変調されたＳＳＢ信号とを
得る。[Example] Next, an example of the present invention will be described with reference to the drawings. FIGS. 1(a) and 1(b) are system diagrams of an embodiment of the present invention. Figure 1(a) shows the configuration of the transmitting side.
1 is an FM modulator with ten video subcarriers. The output of the FM modulator 1 is outputted via a microwave power amplifier 2. A part of the input video signal is supplied to the sync separator 11,
A signal of 15.75KIIZ synchronized with the synchronization signal of the input saw can be obtained, and the oscillator 5b is synchronized with this synchronization signal. The carrier oscillator 5b necessary for this SSB modulation is configured as an LC or RC free running oscillator. The second audio signal is SSB
The SSB modulation signal 19 is applied to the modulator 4 and uses the upper sideband. However, when synchronizing to 15.75 and twice IIZ, the lower sideband is used. The SSB signal thus obtained is FM-modulated by the subcarrier modulator 3 together with the first audio signal. In this way, the transmitter modulates the second audio signal. As shown in Figure 1(b),
The receiving side obtains a video signal and a subcarrier from a video+subcarrier demodulator 6. On the other hand, by demodulating the subcarrier in the audio+SSB signal demodulator 7, the first audio signal and the second
An SSB signal modulated by the second audio signal is obtained.
復調器７の出力を第１番目の音声信号（主信号）のみを
通過させるローパスフィルタ８に通ずことにより、第１
番目の音声信号を１ｑる。次に映像信号より同期分離器
１２を用いて取り出された同期信号をもとにフリーラン
ニングの発振器９ｂをこの同期信号に同期させ、これを
キャリアとしＳＳＢ復調器１０によりＳＳＢ復調するこ
とによりＳＳＢ変調信号を得る。これにより復調する側
のキャリアは送信側のＳＳＢ変調用のキャリアに１００
％同期し、高品質なＳＳ［３の復調を行うことができる
。By passing the output of the demodulator 7 through a low-pass filter 8 that passes only the first audio signal (main signal), the first
The th audio signal is 1q. Next, based on the synchronization signal extracted from the video signal using the synchronization separator 12, the free running oscillator 9b is synchronized with this synchronization signal, and SSB demodulation is performed by the SSB demodulator 10 using this as a carrier, thereby performing SSB modulation. Get a signal. As a result, the carrier on the demodulating side is 100 times the carrier for SSB modulation on the transmitting side.
% synchronization and can perform high-quality demodulation of SS[3.
［発明の効果］
以上説明したように本発明はＳＳＢ変調のためのキャリ
アとして映像同期信号に同期した信号を用いることによ
り、水晶を用いた場合に比べて低価格で、安定した第２
音声信号の伝送を行うことができる効果を有するもので
ある。[Effects of the Invention] As explained above, the present invention uses a signal synchronized with a video synchronization signal as a carrier for SSB modulation, thereby achieving a stable secondary signal at a lower cost than when using a crystal.
This has the effect of making it possible to transmit audio signals.
第１図（ａ）は本発明の一実施例における送信側の系統
図、（ｂ）は同受信側の系統図、第２図（ａ）は従来例
における送信側の系統図、（ｂ）は同受信側の系統図で
ある。
１・・・映像士副搬送波変調器
２・・・マイクロ波増巾器 ３・・・副搬送波変調器４
・・・ＳＳＢ変調器 ５ｂ、 ９ｂ・・・搬送波発
振器６・・・映像士副搬送波復調器FIG. 1(a) is a system diagram of the transmitting side in an embodiment of the present invention, (b) is a system diagram of the receiving side, FIG. 2(a) is a system diagram of the transmitting side in the conventional example, (b) is a system diagram on the receiving side. 1... Imager subcarrier modulator 2... Microwave amplifier 3... Subcarrier modulator 4
...SSB modulator 5b, 9b...carrier wave oscillator 6...videographer subcarrier demodulator
Claims (1)
番目の音声信号に、第２番目以下の音声又はデータ信号
をＳＳＢ方式にて変調して重畳し、重畳した信号で副搬
送波を変調し、副搬送波を映像信号に多重して伝送する
音声伝送方式において、ＳＳＢ方式の変調或いは復調に
必要な搬送波を、映像信号のうちの映像同期信号に同期
させることを特徴とする音声伝送方式。(1) The first of two or more audio signals including data signals
An audio transmission method in which the second and subsequent audio or data signals are modulated and superimposed on the second audio signal using the SSB method, the subcarrier is modulated with the superimposed signal, and the subcarrier is multiplexed onto the video signal and transmitted. An audio transmission system characterized in that a carrier wave required for modulation or demodulation of the SSB system is synchronized with a video synchronization signal of a video signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61081289A JPS62237874A (en) | 1986-04-09 | 1986-04-09 | Voice transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61081289A JPS62237874A (en) | 1986-04-09 | 1986-04-09 | Voice transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62237874A true JPS62237874A (en) | 1987-10-17 |
Family
ID=13742220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61081289A Pending JPS62237874A (en) | 1986-04-09 | 1986-04-09 | Voice transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62237874A (en) |
-
1986
- 1986-04-09 JP JP61081289A patent/JPS62237874A/en active Pending
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