JPS6416111A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- JPS6416111A JPS6416111A JP17112287A JP17112287A JPS6416111A JP S6416111 A JPS6416111 A JP S6416111A JP 17112287 A JP17112287 A JP 17112287A JP 17112287 A JP17112287 A JP 17112287A JP S6416111 A JPS6416111 A JP S6416111A
- Authority
- JP
- Japan
- Prior art keywords
- level
- output
- circuit
- reference voltage
- voltage setting
- 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
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To always obtain a stable output in a prescribed level by providing a first detecting means which detects the output level and a second detecting means which detects the presence or the absence of an input signal and changing the output level from a reference voltage setting means and the frequency characteristic of a two-wave means in accordance with the output from the second detecting means. CONSTITUTION:When a video signal having a normal amplitude is inputted, the reference level of a reference voltage setting circuit 3 is fixed to the first level because an input detecting circuit 6 outputs the high level which indicates the presence of the input signal. When disappearance of the input signal is discriminated, the output of the input detecting circuit 6 goes to the low level and the reference level of the reference voltage setting circuit 3 is changed to the second level. Since the output of an AGC amplifier 1 is suppressed by this change, the noise whose amplification is started on the side of an output terminal 202 is reduced. Thereafter, the frequency band of an LPF 5 is changed and fixed to the second frequency characteristic, and the time constant of operation is shorter. Consequently, this circuit is operated to amplify the signal to a steady level with quick response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17112287A JPS6416111A (en) | 1987-07-10 | 1987-07-10 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17112287A JPS6416111A (en) | 1987-07-10 | 1987-07-10 | Automatic gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6416111A true JPS6416111A (en) | 1989-01-19 |
Family
ID=15917393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17112287A Pending JPS6416111A (en) | 1987-07-10 | 1987-07-10 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6416111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0804023A2 (en) * | 1996-04-24 | 1997-10-29 | Lg Electronics Inc. | High speed channel detection, storing, and switching apparatus and method thereof |
-
1987
- 1987-07-10 JP JP17112287A patent/JPS6416111A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0804023A2 (en) * | 1996-04-24 | 1997-10-29 | Lg Electronics Inc. | High speed channel detection, storing, and switching apparatus and method thereof |
| EP0804023A3 (en) * | 1996-04-24 | 1998-09-02 | Lg Electronics Inc. | High speed channel detection, storing, and switching apparatus and method thereof |
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