JPH0163216U - - Google Patents
Info
- Publication number
- JPH0163216U JPH0163216U JP1988134159U JP13415988U JPH0163216U JP H0163216 U JPH0163216 U JP H0163216U JP 1988134159 U JP1988134159 U JP 1988134159U JP 13415988 U JP13415988 U JP 13415988U JP H0163216 U JPH0163216 U JP H0163216U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- filter
- directional coupler
- circuit
- intermediate frequency
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第１図は従来技術による同軸線路用中継増幅器
の自動利得制御手段を説明するための回路ブロツ
ク図、第２図は本考案の一実施例を示す回路ブロ
ツク図、第３図は選択増幅回路のフイルタによる
選択特性を上記第１図に示す回路方式の場合と、
上記第２図に示す本考案の一実施例における回路
方式の場合とで対比して示す図である。
１……主増幅器、２……電圧制御可変減衰器、
３……方向性結合器、６……検波器、７……直流
増幅器、１１……入力フイルタ、１２……混合器
、１３……局部発振器、１４……中間周波フイル
タ、１５……中間周波増幅器、２０……選択増幅
回路、２１……周波数変換回路。
Fig. 1 is a circuit block diagram for explaining automatic gain control means for a relay amplifier for coaxial lines according to the prior art, Fig. 2 is a circuit block diagram showing an embodiment of the present invention, and Fig. 3 is a circuit block diagram of a selective amplifier circuit. The selection characteristics by the filter are shown in the case of the circuit system shown in Fig. 1 above, and
FIG. 2 is a diagram showing a comparison between the circuit system according to the embodiment of the present invention shown in FIG. 2 above; 1... Main amplifier, 2... Voltage controlled variable attenuator,
3... Directional coupler, 6... Detector, 7... DC amplifier, 11... Input filter, 12... Mixer, 13... Local oscillator, 14... Intermediate frequency filter, 15... Intermediate frequency Amplifier, 20... selection amplification circuit, 21... frequency conversion circuit.
Claims (1)
て自動利得制御を行なう有線テレビジヨン用中継
増幅器に於いて、方向性結合器と、同方向性結合
器の前段に設けられた電圧制御可変減衰器と、上
記方向性結合器より伝送信号の一部を取出し、自
動利得制御の対象となる信号を予備選択するフイ
ルタと、このフイルタを経た信号を中間周波数信
号に変換し、上記パイロツト信号のみを選択する
中間周波フイルタと、この信号を増幅し検波する
回路と、同検波信号を上記電圧制御可変減衰器に
帰還する回路とを具備してなることを特徴とする
有線テレビジヨン用中継増幅器。 A relay amplifier for cable television that detects transmission level fluctuations using a pilot signal and performs automatic gain control includes a directional coupler, a voltage-controlled variable attenuator provided before the co-directional coupler, and the above-mentioned components. A filter that takes out a part of the transmission signal from the directional coupler and pre-selects the signal to be subjected to automatic gain control, and an intermediate frequency signal that converts the signal that has passed through this filter into an intermediate frequency signal and selects only the pilot signal. A relay amplifier for cable television, comprising a filter, a circuit for amplifying and detecting this signal, and a circuit for feeding back the detected signal to the voltage-controlled variable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13415988U JPH0230904Y2 (en) | 1988-10-14 | 1988-10-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13415988U JPH0230904Y2 (en) | 1988-10-14 | 1988-10-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0163216U true JPH0163216U (en) | 1989-04-24 |
| JPH0230904Y2 JPH0230904Y2 (en) | 1990-08-21 |
Family
ID=31392662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13415988U Expired JPH0230904Y2 (en) | 1988-10-14 | 1988-10-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0230904Y2 (en) |
-
1988
- 1988-10-14 JP JP13415988U patent/JPH0230904Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0230904Y2 (en) | 1990-08-21 |
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