JPH027230B2 - - Google Patents
Info
- Publication number
- JPH027230B2 JPH027230B2 JP55079783A JP7978380A JPH027230B2 JP H027230 B2 JPH027230 B2 JP H027230B2 JP 55079783 A JP55079783 A JP 55079783A JP 7978380 A JP7978380 A JP 7978380A JP H027230 B2 JPH027230 B2 JP H027230B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- converter
- audio
- video
- output
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Television Receiver Circuits (AREA)
- Television Systems (AREA)
Description
【発明の詳細な説明】
この発明は例えば音声が多重化されたテレビジ
ヨン放送装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in television broadcasting equipment in which audio is multiplexed, for example.
第１図は周知のテレビジヨン放送装置の一例で
ある。映像信号fpは映像変調器１１で所定の映像
搬送波fcpによつて振幅変調され、混合器１２に
供給される。この混合器１２には水晶発振器１３
より搬送波fcが供給されており、この搬送波fcと
前記振幅変調波が混合される。この混合出力信号
は電力増幅器１４において増幅される。また、左
(L)、右（Ｒ）の映像信号は多重変調器１５に供給
され多重化される。この信号はアイソレーシヨン
トランス１６を介して音声変調部１７に供給さ
れ、音声搬送波fcAによつて周波数変調される。
この変調波は前記水晶発振器１３より出力される
搬送波fcとともに混合器１８に供給され混合され
る。この混合出力信号は電力増幅器１９に供給さ
れ増幅される。 FIG. 1 shows an example of a well-known television broadcasting device. The video signal fp is amplitude-modulated by a predetermined video carrier wave fcp in a video modulator 11 and is supplied to a mixer 12. This mixer 12 has a crystal oscillator 13
A carrier wave fc is supplied from the carrier wave fc, and this carrier wave fc and the amplitude modulated wave are mixed. This mixed output signal is amplified in power amplifier 14. Also, the left
The (L) and right (R) video signals are supplied to a multiplex modulator 15 and multiplexed. This signal is supplied to the audio modulation section 17 via the isolation transformer 16, and is frequency modulated by the audio carrier wave fcA .
This modulated wave is supplied to the mixer 18 together with the carrier wave fc output from the crystal oscillator 13 and mixed therein. This mixed output signal is supplied to a power amplifier 19 and amplified.
上記構成において、音声多重信号として第２図
に示すようなスペクトルの信号を供給すると左右
の分離度が低域周波数帯と高域周波数帯とで劣化
する。これはアイソレーシヨントランス１６が原
因するものであるが、このトランス１６を使用し
ない場合、Ｓ／Ｎ比が劣化するために、これを省
略することは難しい。また、多重変調器１５と音
声変調部１７とをアイソレーシヨントランス１６
を含めて長い伝送線路で接続すると、温度変化等
によつて主チヤンネルCH1と副チヤンネルCH2に
レベル差が生じ分離劣化を生ずることがある。さ
らに、映像信号変調器１１や音声変調器１７等の
小信号部は電力増幅器１４，１９等の大信号部の
近傍にあると、例えば電源トランスの磁束による
ハム等の雑音の影響を受けてＳ／Ｎ比が劣化する
こともある。 In the above configuration, if a signal having a spectrum as shown in FIG. 2 is supplied as an audio multiplexed signal, the left and right separation degree will deteriorate in the low frequency band and the high frequency band. This is caused by the isolation transformer 16, but if this transformer 16 is not used, the S/N ratio will deteriorate, so it is difficult to omit it. Further, the multiplex modulator 15 and the audio modulator 17 are connected to an isolation transformer 16.
If a long transmission line is used to connect the main channel CH 1 and the sub channel CH 2 due to temperature changes, etc., a level difference may occur between the main channel CH 1 and the sub channel CH 2 , resulting in separation deterioration. Furthermore, if small signal sections such as the video signal modulator 11 and audio modulator 17 are located near large signal sections such as the power amplifiers 14 and 19, they will be affected by noise such as hum caused by the magnetic flux of the power transformer. /N ratio may deteriorate.
この発明は上記事情に基づいてなされたもの
で、映像信号や多重化された音声信号等の小信号
部とこれらを電力増幅する大信号部とを光電変換
手段を介して接続することにより、大信号部から
の雑音の影響を除去してＳ／Ｎ比を良好にするこ
とが可能であり、しかも、アイソレーシヨントラ
ンス１６を省略して多重化された音声信号の分離
度を劣化することが少ないテレビジヨン放送装置
を提供しようとするものである。 This invention has been made based on the above circumstances, and is capable of generating large signals by connecting small signal parts such as video signals and multiplexed audio signals to large signal parts for power amplifying these signals via photoelectric conversion means. It is possible to improve the S/N ratio by removing the influence of noise from the signal section, and moreover, it is possible to omit the isolation transformer 16 and to reduce the degree of separation of multiplexed audio signals. It is an attempt to provide a television broadcasting device with a small number of units.
以下、この発明の一実施例について図面を参照
して説明する。尚、第１図と同一部分には同一符
号を付し説明は省略する。 An embodiment of the present invention will be described below with reference to the drawings. Incidentally, the same parts as in FIG. 1 are given the same reference numerals, and the description thereof will be omitted.
第３図において、３１は電気信号を光に変換す
るＥ／Ｏ変換器である。この変換器３１には映像
変調器１１、音声変調器１７の出力信号が供給さ
れており、この両信号はそれぞれ異なる波長の光
に変換される。この光は光学的に合成され光フア
イバー３２によつてＯ／Ｅ変換器３３に伝送され
る。このＯ／Ｅ変換器３３は伝送された光を分波
し、各波長毎に電気信号に変換するものである。
この変換出力信号はそれぞれ混合器１２，１８に
供給される。 In FIG. 3, 31 is an E/O converter that converts electrical signals into light. This converter 31 is supplied with the output signals of the video modulator 11 and the audio modulator 17, and these two signals are converted into light having different wavelengths. This light is optically combined and transmitted to an O/E converter 33 via an optical fiber 32. This O/E converter 33 demultiplexes the transmitted light and converts it into electrical signals for each wavelength.
The converted output signals are supplied to mixers 12 and 18, respectively.
上記構成によれば、映像、音声変調器１１，１
７、多重変調器１５からなる小信号部と、電力増
幅器１４，１９等からなる大信号部とをＥ／Ｏ変
換器３１、Ｏ／Ｅ変換器３３、光フアイバ３２か
らなる光電変換部によつて分離している。したが
つて、大信号部の電源ハム等が小信号部に影響を
及ぼすことがないためＳ／Ｎ比の劣化を抑えるこ
とが可能である。 According to the above configuration, the video and audio modulators 11, 1
7. A small signal section consisting of the multiplex modulator 15 and a large signal section consisting of the power amplifiers 14, 19, etc. are connected by a photoelectric conversion section consisting of an E/O converter 31, an O/E converter 33, and an optical fiber 32. It is separated. Therefore, since power supply hum or the like in the large signal section does not affect the small signal section, it is possible to suppress deterioration of the S/N ratio.
また、Ｓ／Ｎ比が良好であるためアイソレーシ
ヨントランス１６を省略することができ、多重化
された音声信号の分離度劣化を抑え得て良好な放
送を行なうことができる。 In addition, since the S/N ratio is good, the isolation transformer 16 can be omitted, and deterioration in the degree of separation of multiplexed audio signals can be suppressed, making it possible to perform good broadcasting.
さらに、多重変調器１５と音声変調器１７とを
接続する線路を短縮し得るため温度等による音声
信号の主チヤンネル、副チヤンネルのレベル差を
少なくすることが可能である。 Furthermore, since the line connecting the multiplex modulator 15 and the audio modulator 17 can be shortened, it is possible to reduce the level difference between the main channel and the sub-channel of the audio signal due to temperature or the like.
なお、第３図において音声信号のみを光に変換
し映像信号は光に変換せず伝送してもよい。 In addition, in FIG. 3, only the audio signal may be converted into light, and the video signal may be transmitted without being converted into light.
以上、詳述したようにこの発明によれば、大信
号部からの雑音の影響を受けないためＳ／Ｎ比が
良好であり、しかも、アイソレーシヨントランス
を省略できるため多重化された音声信号の分離度
を劣化することが少ないテレビジヨン放送装置を
提供できる。 As described in detail above, according to the present invention, the S/N ratio is good because it is not affected by noise from the large signal section, and furthermore, since the isolation transformer can be omitted, the multiplexed audio signal It is possible to provide a television broadcasting device in which the degree of separation is less likely to deteriorate.
第１図は従来のテレビジヨン放送装置の一例を
示す構成図、第２図は第１図を説明するために示
す図、第３図はこの発明に係わるテレビジヨン放
送装置の一実施例を示す構成図である。
１１……映像変調器、１４，１９……電力増幅
器、１５……多重変調器、１７……音声変調器、
３１……Ｅ／Ｏ変換器、３２……光フアイバ、３
３……Ｏ／Ｅ変換器。
FIG. 1 is a block diagram showing an example of a conventional television broadcasting device, FIG. 2 is a diagram shown to explain FIG. 1, and FIG. 3 is a diagram showing an embodiment of a television broadcasting device according to the present invention. FIG. 11...Video modulator, 14, 19...Power amplifier, 15...Multiple modulator, 17...Audio modulator,
31... E/O converter, 32... Optical fiber, 3
3...O/E converter.
Claims (1)
声変調部と、映像信号を振幅変調する映像変調部
と、前記音声変調部の出力と前記映像変調部の出
力がそれぞれ入力され、それぞれ異なる波長の光
信号に変換する電気信号−光信号変換器と、この
変換器の出力を伝送する光伝送路と、この光伝送
路の伝送光を分波し、各波長毎に電気信号に変換
する光信号−電気信号変換器と、この変換器の各
変換出力に搬送波を混合した後、電力増幅する電
力増幅部とを具備したテレビジヨン放送装置。1. An audio modulation section that multiplexes and frequency modulates left and right audio signals, a video modulation section that amplitude modulates a video signal, the output of the audio modulation section and the output of the video modulation section are respectively inputted, and light of different wavelengths is input. An electrical signal that is converted into a signal - an optical signal converter, an optical transmission line that transmits the output of this converter, and an optical signal that demultiplexes the transmitted light of this optical transmission line and converts it into an electrical signal for each wavelength - A television broadcasting device comprising an electrical signal converter and a power amplification unit that amplifies the power after mixing a carrier wave with each conversion output of the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7978380A JPS575484A (en) | 1980-06-13 | 1980-06-13 | Television broadcast device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7978380A JPS575484A (en) | 1980-06-13 | 1980-06-13 | Television broadcast device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS575484A JPS575484A (en) | 1982-01-12 |
| JPH027230B2 true JPH027230B2 (en) | 1990-02-16 |
Family
ID=13699800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7978380A Granted JPS575484A (en) | 1980-06-13 | 1980-06-13 | Television broadcast device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS575484A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03284542A (en) * | 1990-03-30 | 1991-12-16 | Ngk Insulators Ltd | Palletizing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53149525U (en) * | 1977-04-30 | 1978-11-25 |
-
1980
- 1980-06-13 JP JP7978380A patent/JPS575484A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03284542A (en) * | 1990-03-30 | 1991-12-16 | Ngk Insulators Ltd | Palletizing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS575484A (en) | 1982-01-12 |
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