GB533275A - Means for deriving a voltage dependent upon the mean voltage of a modulated carrier wave, for example for automatic gain control purposes - Google Patents
Means for deriving a voltage dependent upon the mean voltage of a modulated carrier wave, for example for automatic gain control purposesInfo
- Publication number
- GB533275A GB533275A GB2876939A GB2876939A GB533275A GB 533275 A GB533275 A GB 533275A GB 2876939 A GB2876939 A GB 2876939A GB 2876939 A GB2876939 A GB 2876939A GB 533275 A GB533275 A GB 533275A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- carrier wave
- modulated carrier
- deriving
- rectifiers
- 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
Links
- 230000001419 dependent effect Effects 0.000 title abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Amplitude Modulation (AREA)
Abstract
533,275. Automatic volume control. HILL, C. J. W., and SMITH, J. W. Oct. 26, 1939, No. 28769. [Class 40 (v)] A circuit for deriving a voltage dependent upon the mean voltage of a modulated carrier wave comprises two rectifiers connected in opposition such that the modulation components cancel one another, the desired voltage being derived from only one of the rectifiers. The modulated carrier wave is applied through condensers Cl, C2 to the rectifiers D1, D2, which are connected in opposition and are provided with load resistances R1, R2 the outputs from which are combined through high resistances R3, R4 and an isolating condenser C3. In the circuit the audio-frequency components are cancelled out and, due to condenser C3, only the D.C. output from diode D2 is passed through a filter C4, C5, R5, R6 to remove radio frequencies and then to the grid of a D.C. amplifier T, from the anode of which the desired A.G.C. voltage is taken. A negative grid bias for the triode T is obtained from the resistance R9 and this serves as a delay voltage for the A.G.C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2876939A GB533275A (en) | 1939-10-26 | 1939-10-26 | Means for deriving a voltage dependent upon the mean voltage of a modulated carrier wave, for example for automatic gain control purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2876939A GB533275A (en) | 1939-10-26 | 1939-10-26 | Means for deriving a voltage dependent upon the mean voltage of a modulated carrier wave, for example for automatic gain control purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB533275A true GB533275A (en) | 1941-02-10 |
Family
ID=10280850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2876939A Expired GB533275A (en) | 1939-10-26 | 1939-10-26 | Means for deriving a voltage dependent upon the mean voltage of a modulated carrier wave, for example for automatic gain control purposes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB533275A (en) |
-
1939
- 1939-10-26 GB GB2876939A patent/GB533275A/en not_active Expired
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