GB501349A - - Google Patents
Info
- Publication number
- GB501349A GB501349A GB501349DA GB501349A GB 501349 A GB501349 A GB 501349A GB 501349D A GB501349D A GB 501349DA GB 501349 A GB501349 A GB 501349A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- control
- voltage
- receiver
- impulses
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
- H04N5/53—Keyed automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
501,349. Automatic volume control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., FEWINGS, D. J., and KEMP, R. J. Aug. 25, 1937, No. 23302. [Class 40 (v)] The A.V.C. system of a television receiver is controlled by line or frame synchronizing impulses which are transformed into modified saw-tooth wave form before rectification to produce the control potential. The pulses are applied to a triode 3 whose anode-cathode circuit includes a condenser 4 which is charged through a resistance 5 to substantially the anode voltage in a period slightly less than that between successive impulses. The condenser is rapidly discharged through valve 3 when a pulse is applied to the grid. The voltage across condenser 4 is rectified by a diode 10 and used after smoothing to control the gain of the receiver.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB842474X | 1937-08-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501349A true GB501349A (en) |
Family
ID=10567507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB501349D Active GB501349A (en) | 1937-08-25 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR842474A (en) |
| GB (1) | GB501349A (en) |
-
0
- GB GB501349D patent/GB501349A/en active Active
-
1938
- 1938-08-22 FR FR842474D patent/FR842474A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR842474A (en) | 1939-06-13 |
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