GB529319A - Television automatic amplification control system - Google Patents
Television automatic amplification control systemInfo
- Publication number
- GB529319A GB529319A GB15759/39A GB1575939A GB529319A GB 529319 A GB529319 A GB 529319A GB 15759/39 A GB15759/39 A GB 15759/39A GB 1575939 A GB1575939 A GB 1575939A GB 529319 A GB529319 A GB 529319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control
- transformer
- slope
- variation
- developed
- 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
- 230000003321 amplification Effects 0.000 title 1
- 238000003199 nucleic acid amplification method Methods 0.000 title 1
- 238000005286 illumination Methods 0.000 abstract 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
529,319. Automatic volume control. HAZELTINE CORPORATION. May 26, 1939, No. 15759. Convention date, June 21, 1938. [Classes 40 (iii) and 40 (v)] Bias for automatic gain control in a television receiver is developed from the slope of the trailing edge of the synchronizing signals, and is thus not affected by variation of the average intensity of the carrier due to variation of background illumination. An output from the detector 15 is applied to a limiter tube 21, which only passes a portion of the synchronizing pulses to a transformer 26. The output from the transformer 26, being the time differential of the input, is a measure of the slope of the synchronizing pulse and is rectified by a diode 27 and developed as a control voltage across a circuit 28. 29. This voltage is applied to the control electrodes in one or more of the units 12, 13, 14. The time constant of the circuit 28, 29 is long compared with the fieldscanning period, it may be 1/10 second.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US214880A US2214846A (en) | 1938-06-21 | 1938-06-21 | Television automatic amplification control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB529319A true GB529319A (en) | 1940-11-19 |
Family
ID=22800768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15759/39A Expired GB529319A (en) | 1938-06-21 | 1939-05-26 | Television automatic amplification control system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2214846A (en) |
| FR (1) | FR856661A (en) |
| GB (1) | GB529319A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965907C (en) * | 1953-11-27 | 1957-06-27 | Emi Ltd | Circuit arrangement for determining the amplitude of pulses |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL74843C (en) * | 1941-10-31 | |||
| BE469699A (en) * | 1945-09-27 | |||
| US2543015A (en) * | 1945-09-27 | 1951-02-27 | Standard Telephones Cables Ltd | Receiver circuit |
| GB840842A (en) * | 1955-08-03 | 1960-07-13 | Emi Ltd | Improvements in or relating to automatic gain control circuits in television receivers |
-
1938
- 1938-06-21 US US214880A patent/US2214846A/en not_active Expired - Lifetime
-
1939
- 1939-05-26 GB GB15759/39A patent/GB529319A/en not_active Expired
- 1939-06-20 FR FR856661D patent/FR856661A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965907C (en) * | 1953-11-27 | 1957-06-27 | Emi Ltd | Circuit arrangement for determining the amplitude of pulses |
Also Published As
| Publication number | Publication date |
|---|---|
| FR856661A (en) | 1940-08-01 |
| US2214846A (en) | 1940-09-17 |
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