JP2643245B2 - Bidirectional CATV transmission system - Google Patents
Bidirectional CATV transmission systemInfo
- Publication number
- JP2643245B2 JP2643245B2 JP63053145A JP5314588A JP2643245B2 JP 2643245 B2 JP2643245 B2 JP 2643245B2 JP 63053145 A JP63053145 A JP 63053145A JP 5314588 A JP5314588 A JP 5314588A JP 2643245 B2 JP2643245 B2 JP 2643245B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- pass
- bidirectional catv
- frequency
- 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
- 230000002457 bidirectional effect Effects 0.000 title claims description 22
- 230000005540 biological transmission Effects 0.000 title claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は双方向CATV伝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 bidirectional CATV transmission system.
従来、双方向CATV伝送方式は、任意の端末から他の端
末あるいは端末群に信号を伝送する場合、任意の端末か
ら入力された信号は上り回線を使用し、センタへ伝送さ
れる。そして、ヘツドエンドにおいてはその信号を周波
数変換し、下り回線を使用し他の端末あるいは端末群に
伝送する方式となつていた。Conventionally, in the bidirectional CATV transmission method, when a signal is transmitted from an arbitrary terminal to another terminal or a group of terminals, a signal input from an arbitrary terminal is transmitted to a center using an uplink. At the head end, the signal is frequency-converted and transmitted to another terminal or a group of terminals using a downlink.
上述した従来の双方向CATV伝送方式では、任意の端末
から他の端末あるいは端末群に信号を伝送する場合、上
り回線を使用し、端末の位置する場所から遠隔に位置す
るヘツドエンドを介して下り回線へ伝送するので、NFを
劣化させる機器を多く経由することになるので信号のC/
Nが劣化するという課題があつた。In the conventional bidirectional CATV transmission method described above, when transmitting a signal from an arbitrary terminal to another terminal or a group of terminals, an uplink is used, and a downlink is transmitted from a location where the terminal is located via a head end located remotely. Since the signal is transmitted to the
There was a problem that N deteriorated.
本発明の双方向CATVは、上り用低域増幅部の出力が第
１の方向性波器の低域通過端子と接続されるとともに
帯域通過波器の第１端子に接続され、上記帯域通過
波器の第２端子と周波数変換部の入力端子とを接続し、
下り用高域増幅部の出力が第２の方向性波器の高域通
過端子と接続されるとともに上記周波数変換部の出力端
子に接続され、上記周波数変換部の制御端子と制御器と
を接続し構成した双方向CATV中継増幅器を備えてなるも
のである。In the bidirectional CATV of the present invention, the output of the upstream low-pass amplifier is connected to the low-pass terminal of the first directional wave device and to the first terminal of the band-pass wave device. Connecting the second terminal of the device and the input terminal of the frequency converter,
The output of the downstream high-frequency amplification unit is connected to the high-pass terminal of the second directional wave device and connected to the output terminal of the frequency conversion unit, and connects the control terminal of the frequency conversion unit to the controller. It comprises a bidirectional CATV repeater amplifier configured as described above.
本発明においては、任意の端末から他の端末あるいは
端末群に信号を伝送する場合、信号は一度ヘツドエンド
まで上ることなく、双方向CATV中継増幅器にて折り返し
て分配網へ伝送する。In the present invention, when transmitting a signal from an arbitrary terminal to another terminal or a group of terminals, the signal is returned to the distribution network by being returned by the bidirectional CATV repeater amplifier without going up to the head end once.
以下、図面に基づき本発明の実施例を詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例を説明するための双方向CA
TVシステムのブロツク図である。FIG. 1 is a bidirectional CA for explaining an embodiment of the present invention.
It is a block diagram of a TV system.
この第１図において、１はセンタ、2,3……６は双方
向CATV中継増幅装置、7,8……10はタツプオフ、11〜13
は保安器、14〜16は端末機器である。In FIG. 1, 1 is a center, 2, 3,..., 6 are bidirectional CATV repeater amplifiers, 7, 8,.
Is a security device, and 14 to 16 are terminal devices.
第２図は第１図における双方向CATV中継増幅装置に係
る部分を抽出して示したブロツク図である。FIG. 2 is a block diagram showing a portion related to the bidirectional CATV relay amplifying apparatus in FIG.
この第２図において、17,18は入出力端子、19は第１
の方向性波器、20および21はこの第１の方向性波器
19の高域通過端子および低域通過端子、22は第２の方向
性波器、23はこの第２の方向性波器22の高域通過端
子、24は第３の方向性波器、25は高域増幅部、26は低
域増幅部、27は分配器、28〜31は、分岐側入出力端子、
32は帯域通過波器、33,34はこの帯域通過波器32の
端子、35は周波数変換部、36および37はこの周波数変換
部35の入力端子および出力端子、39は周波数変換部35の
制御端子38と接続される制御器である。In FIG. 2, reference numerals 17 and 18 denote input / output terminals, and reference numeral 19 denotes a first
Directional waver, 20 and 21 are the first directional waver
Reference numeral 19 denotes a high-pass terminal and a low-pass terminal; 22, a second directional wave; 23, a high-pass terminal of the second directional wave 22; 24, a third directional wave; Is a high-frequency amplifier, 26 is a low-frequency amplifier, 27 is a distributor, 28 to 31 are branch-side input / output terminals,
32 is a band pass wave device, 33 and 34 are terminals of the band pass wave device 32, 35 is a frequency conversion unit, 36 and 37 are input and output terminals of the frequency conversion unit 35, and 39 is a control of the frequency conversion unit 35. A controller connected to the terminal 38.
そして、双方向CATV中継増幅器は、上り用低域増幅部
26の出力が第１の方向性波器19の低域通過端子21と接
続されるとともに帯域通過波器32の端子33に接続さ
れ、この帯域通過波器32の端子34と周波数変換部35の
入力端子36とを接続し、下り用高域増幅部25の出力が第
２の方向性波器22の高域通過端子23と接続されるとと
もに周波数変換部35の出力端子37に接続され、この周波
数変換部35の制御端子38と制御器39とを接続し構成され
ている。And the bidirectional CATV repeater amplifier is a low-pass amplifier for upstream.
The output of 26 is connected to the low-pass terminal 21 of the first directional wave device 19 and to the terminal 33 of the band-pass wave device 32. The terminal 34 of the band-pass wave device 32 and the frequency conversion unit 35 An input terminal 36 is connected, and an output of the downstream high-frequency amplification unit 25 is connected to the high-pass terminal 23 of the second directional wave device 22 and to an output terminal 37 of the frequency conversion unit 35. The control terminal 38 of the frequency conversion unit 35 and the controller 39 are connected to each other.
つぎに第１図および第２図に示す実施例の動作を説明
する。Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.
まず、第１図に示す端末機器15より端末機器16に信号
を伝送する場合を例にとつて説明する。First, a case where a signal is transmitted from the terminal device 15 to the terminal device 16 shown in FIG. 1 will be described as an example.
端末機器15より入力された信号は上り回線伝送に用い
る低域周波数の信号であり、保安器12およびタツプオフ
９を介して双方向CATV中継増幅器６の分岐側入出力端子
28に入力される。そして、この双方向CATV中継増幅器６
において、その分岐側入出力端子28より入力された信号
は、分配器27と第３の方向性波器24および低域増幅部
26を介して第１の方向性波器19の低域通過端子21に入
力されるとともに帯域通過波器32の端子34より出力さ
れた信号は周波数変換部35の入力端子36に入力され、制
御器39によつて指定される下り回線伝送に用いる高域周
波数に変換される。そして、周波数変換された信号は高
域増幅部25の出力側に供給され、第３の方向性波器24
と分配器27を介し、分岐側入出力端子28により出力され
る。この分岐側入出力端子28からの信号はタツプオフ９
と保安器13を介し端末機器16に到達する。The signal input from the terminal device 15 is a low-frequency signal used for uplink transmission, and is input / output terminal of the bidirectional CATV relay amplifier 6 via the protector 12 and the tap-off 9.
Entered in 28. And this bidirectional CATV relay amplifier 6
, The signal input from the branch-side input / output terminal 28 is divided into a divider 27, a third directional wave 24, and a low-frequency amplifier.
The signal inputted to the low-pass terminal 21 of the first directional wave device 19 via 26 and the signal outputted from the terminal 34 of the band-pass wave device 32 is inputted to the input terminal 36 of the frequency conversion unit 35, The frequency is converted into a higher frequency used for downlink transmission specified by the transmitter 39. Then, the frequency-converted signal is supplied to the output side of the high frequency amplifier 25, and the third directional wave
Is output from the branch-side input / output terminal 28 via the distributor 27. The signal from the branch side input / output terminal 28 is
And reaches the terminal device 16 via the protector 13.
つぎに、端末機器15から端末機器14および端末機器16
に信号を伝送する場合には、双方向CATV中継増幅器２に
て前述の端末機器15より端末機器16に信号を伝送する場
合と同じ動作原理にて行なうことができる。Next, from the terminal device 15 to the terminal device 14 and the terminal device 16
When transmitting a signal to the terminal device 16, the signal can be transmitted by the bidirectional CATV relay amplifier 2 according to the same operation principle as that for transmitting a signal from the terminal device 15 to the terminal device 16.
また、本発明の双方向CATV伝送方式を用いれば、任意
の端末機器から入力した信号を他の端末機器あるいは不
特定多数の端末群に対してより最短のルートで低送する
ことができる。Further, if the bidirectional CATV transmission method of the present invention is used, it is possible to transmit a signal input from an arbitrary terminal device to another terminal device or an unspecified number of terminal groups by a shortest route.
以上説明したように、本発明によれば、任意の端末か
ら他の端末あるいは端末群に信号を伝送する場合、信号
は一度ヘツドエンドまで上ることなく、双方向CATV中継
増幅器にて折り返して下り分配網へ伝送されるので、信
号のC/Nの劣化を小さくすることができる効果がある。As described above, according to the present invention, when a signal is transmitted from an arbitrary terminal to another terminal or a group of terminals, the signal does not go up to the head end once, but is folded back by the bidirectional CATV relay amplifier and transmitted to the downstream distribution network. Therefore, there is an effect that deterioration of C / N of a signal can be reduced.
第１図は本発明の一実施例を説明するための双方向CATV
システムのブロツク図、第２図は第１図における双方向
CATV中継増幅部に係る部分を抽出して示したブロツク図
である。 １……センタ、２〜６……双方向CATV中継増幅装置、７
〜10……タツプオフ、11〜13……保安器、14〜16……端
末機器、17,18……入出力端子、19……第１の方向性
波器、20……第１の方向性波器の高域通過端子、21…
…第１の方向性波器の低域通過端子、22……第２の方
向性波器、23……第２の方向性波器の高域通過端
子、25……高域増幅部、26……低域増幅部、32……帯域
通過波器、33,34……帯域通過波器の端子、35……
周波数変換部、36……周波数変換部の入力端子、37……
周波数変換部の出力端子、38……周波数変換部の制御端
子、39……制御器。FIG. 1 is a bidirectional CATV for explaining an embodiment of the present invention.
The block diagram of the system, FIG. 2 is the bidirectional in FIG.
FIG. 4 is a block diagram illustrating a portion related to a CATV relay amplifying unit extracted and shown. 1 ... Center, 2-6 ... Bidirectional CATV repeater / amplifier, 7
... 10 tap off, 11-13 protector, 14-16 terminal equipment, 17,18 input / output terminal, 19 ... first directional waver, 20 ... first directional High pass terminals of the wave filter, 21 ...
... A low-pass terminal of the first directional wave device, 22... A high-pass terminal of the second directional wave device, 23. …… Low-frequency amplifier, 32… Bandpass wave, 33,34… Bandpass wave terminals, 35…
Frequency converter, 36 ... Input terminal of frequency converter, 37 ...
Output terminal of frequency converter, 38: Control terminal of frequency converter, 39: controller.
Claims (1)
増幅部の出力が第１の方向性波器の低域通過端子と接
続されるとともに帯域通過波器の第１端子に接続さ
れ、前記帯域通過波器の第２端子と周波数変換部の入
力端子とを接続し、下り用高域増幅部の出力が第２の方
向性波器の高域通過端子と接続されるとともに前記周
波数変換部の出力端子に接続され、前記周波数変換部の
制御端子と制御器とを接続し構成した双方向CATV中継増
幅器を備えたことを特徴とする双方向CATV伝送方式。In a bidirectional CATV system, an output of an upstream low-pass amplifier is connected to a low-pass terminal of a first directional wave device and to a first terminal of a band-pass wave device. A second terminal of the band-pass wave is connected to an input terminal of the frequency converter, an output of the downstream high-frequency amplifier is connected to a high-pass terminal of the second directional wave, and the frequency converter is connected. A bidirectional CATV transmission system, comprising: a bidirectional CATV relay amplifier connected to an output terminal of the frequency converter and connected to a control terminal of the frequency conversion unit and a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63053145A JP2643245B2 (en) | 1988-03-07 | 1988-03-07 | Bidirectional CATV transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63053145A JP2643245B2 (en) | 1988-03-07 | 1988-03-07 | Bidirectional CATV transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01227591A JPH01227591A (en) | 1989-09-11 |
| JP2643245B2 true JP2643245B2 (en) | 1997-08-20 |
Family
ID=12934660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63053145A Expired - Lifetime JP2643245B2 (en) | 1988-03-07 | 1988-03-07 | Bidirectional CATV transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2643245B2 (en) |
-
1988
- 1988-03-07 JP JP63053145A patent/JP2643245B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01227591A (en) | 1989-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |