JPH0344917U - - Google Patents
Info
- Publication number
- JPH0344917U JPH0344917U JP10504989U JP10504989U JPH0344917U JP H0344917 U JPH0344917 U JP H0344917U JP 10504989 U JP10504989 U JP 10504989U JP 10504989 U JP10504989 U JP 10504989U JP H0344917 U JPH0344917 U JP H0344917U
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- agc
- signal
- gain
- voltage
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図は本考案を実施したＡＧＣ回路を示す回
路図である。第２図はテレビジヨン受像機におけ
る一般的なＡＧＣシステムを示すブロツク図であ
る。第３図は従来例の回路図である。
２ａ……ＰＦ増幅器、３……ＩＦ増幅器、５…
…ＡＧＣ電圧生成回路、７……リツプル除去フイ
ルタ、８……強制放電回路。
FIG. 1 is a circuit diagram showing an AGC circuit implementing the present invention. FIG. 2 is a block diagram showing a general AGC system in a television receiver. FIG. 3 is a circuit diagram of a conventional example. 2a...PF amplifier, 3...IF amplifier, 5...
...AGC voltage generation circuit, 7...ripple removal filter, 8...forced discharge circuit.
Claims (1)
よりも後段の回路において得られたＡＧＣ電圧を
印加して前記増幅器の利得を制御するものであつ
て放電時定数の大きいリツプル除去フイルタの作
用を受ける前記ＡＧＣ電圧が前記テレビジヨン信
号の無信号時には前記増幅器の利得を上げるべく
高く、強信号時には前記増幅器の利得を下げるべ
く低くなるＡＧＣ回路において、前記無信号時に
前記リツプル除去フイルタにおけるＡＧＣ電圧を
強制的に低くなす手段を設けたことを特徴とする
ＡＧＣ回路。 The AGC voltage that is obtained in a circuit subsequent to the amplifier is applied to the amplifier that amplifies the television signal to control the gain of the amplifier, and the AGC is subjected to the action of a ripple removal filter having a large discharge time constant. In the AGC circuit, the voltage is high to increase the gain of the amplifier when there is no signal of the television signal, and is low to lower the gain of the amplifier when the signal is strong, and the AGC voltage in the ripple removal filter is forcibly set when there is no signal. An AGC circuit characterized by having a means for lowering the power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10504989U JPH0344917U (en) | 1989-09-07 | 1989-09-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10504989U JPH0344917U (en) | 1989-09-07 | 1989-09-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0344917U true JPH0344917U (en) | 1991-04-25 |
Family
ID=31653822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10504989U Pending JPH0344917U (en) | 1989-09-07 | 1989-09-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0344917U (en) |
-
1989
- 1989-09-07 JP JP10504989U patent/JPH0344917U/ja active Pending
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