JPS56109012A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- JPS56109012A JPS56109012A JP1122180A JP1122180A JPS56109012A JP S56109012 A JPS56109012 A JP S56109012A JP 1122180 A JP1122180 A JP 1122180A JP 1122180 A JP1122180 A JP 1122180A JP S56109012 A JPS56109012 A JP S56109012A
- Authority
- JP
- Japan
- Prior art keywords
- input
- level
- limiter
- increased
- line
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To decrease the return time at steady-state, by limiting the amplitude from the limiter when an input signal is rapidly increased from the limiter and a surge is input to the input. CONSTITUTION:The input signal from the line (a) is amplified by the gain determined with the level of the line (d) with a variable gain control amplifier 1 and becomes the output signal of (b). When the output signal level of (b) is increased than the level of the line (c), a current flows to a resistor 2 and a diode 3, a capacitor 4 is charged with the time constant determined with the resistor 2, and the level of the line (c) is increased, the output (d) of an amplifier 7 is increased and the gain of the amplifier 1 is decreased. In this case, a limiter 8 is provided which makes limit with a slightly higher level than the reference voltage, allowing the limiter 8 to limit the amplitude, if the input signal is rapidly increased and a surge is input to the input. Thus, the capacitor 4 is charged to a slightly higher value than the reference voltage, allowing to reduce the time returned at the steady-state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122180A JPS56109012A (en) | 1980-02-01 | 1980-02-01 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122180A JPS56109012A (en) | 1980-02-01 | 1980-02-01 | Automatic gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56109012A true JPS56109012A (en) | 1981-08-29 |
Family
ID=11771904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1122180A Pending JPS56109012A (en) | 1980-02-01 | 1980-02-01 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56109012A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6165180A (en) * | 1984-09-07 | 1986-04-03 | Tech Res & Dev Inst Of Japan Def Agency | Method for compensating gain variation of radar |
| JPH02126421U (en) * | 1989-03-28 | 1990-10-18 | ||
| CN107925389A (en) * | 2015-08-24 | 2018-04-17 | 雅马哈株式会社 | Signal processing apparatus and speaker unit |
-
1980
- 1980-02-01 JP JP1122180A patent/JPS56109012A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6165180A (en) * | 1984-09-07 | 1986-04-03 | Tech Res & Dev Inst Of Japan Def Agency | Method for compensating gain variation of radar |
| JPH02126421U (en) * | 1989-03-28 | 1990-10-18 | ||
| CN107925389A (en) * | 2015-08-24 | 2018-04-17 | 雅马哈株式会社 | Signal processing apparatus and speaker unit |
| EP3343766A4 (en) * | 2015-08-24 | 2019-07-17 | Yamaha Corporation | Signal processing apparatus and speaker apparatus |
| US10418956B2 (en) | 2015-08-24 | 2019-09-17 | Yamaha Corporation | Signal processing apparatus, speaker apparatus, and signal processing method |
| CN107925389B (en) * | 2015-08-24 | 2021-08-06 | 雅马哈株式会社 | Signal processing device, speaker device, and signal processing method |
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