GB762685A - Improvements in or relating to television receivers - Google Patents
Improvements in or relating to television receiversInfo
- Publication number
- GB762685A GB762685A GB275654A GB275654A GB762685A GB 762685 A GB762685 A GB 762685A GB 275654 A GB275654 A GB 275654A GB 275654 A GB275654 A GB 275654A GB 762685 A GB762685 A GB 762685A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- positive
- going
- circuit
- anode
- 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
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)
- Picture Signal Circuits (AREA)
Abstract
762,685. Automatic gain control. ENGLISH ELECTRIC CO., Ltd. Dec. 14, 1954 [Jan. 29, 1954], No. 2756/54. Class 40(5) In a television A.G.C. circuit the cathode of a diode 7 is directly connected to the anode of a video amplifier 6 at which the composite signal is such that synch. pulses are positive-going. Positive-going pulses derived from the line timebase transformer are applied to the grid of limiter 3 via a time-delay circuit 2, 4. Positive-going impulses of constant amplitude appear in the anode circuit of the limiter 3, the circuit 2, 4 being such that these impulses occur during the " back-porch period of the signal. Pulses of controllable height, adjustable by means of potentiometer 5 which comprises a contrast control, are applied to the anode of the diode 7 and cause conduction during the " back-porch " period. The tips of the pulses are thereby clamped at the black level and the base of the pulses provides a negative potential which after smoothing by network 9, 10, 11 comprises the A.G.C. potential. As an alternative, positive going impulses occurring during the blanking periods of the frame synchronizing signals may be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB275654A GB762685A (en) | 1954-01-29 | 1954-01-29 | Improvements in or relating to television receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB275654A GB762685A (en) | 1954-01-29 | 1954-01-29 | Improvements in or relating to television receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB762685A true GB762685A (en) | 1956-12-05 |
Family
ID=9745305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB275654A Expired GB762685A (en) | 1954-01-29 | 1954-01-29 | Improvements in or relating to television receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB762685A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3249695A (en) * | 1962-09-13 | 1966-05-03 | Hazeltine Research Inc | Control apparatus for a television receiver |
| DE1222970B (en) * | 1959-09-17 | 1966-08-18 | Blaupunkt Werke Gmbh | Television receiver with a device for keyed control voltage generation |
| US4262812A (en) * | 1978-04-10 | 1981-04-21 | Bremenkamp John P | Tool apparatus for sprinkler systems |
-
1954
- 1954-01-29 GB GB275654A patent/GB762685A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1222970B (en) * | 1959-09-17 | 1966-08-18 | Blaupunkt Werke Gmbh | Television receiver with a device for keyed control voltage generation |
| US3249695A (en) * | 1962-09-13 | 1966-05-03 | Hazeltine Research Inc | Control apparatus for a television receiver |
| DE1269160B (en) * | 1962-09-13 | 1968-05-30 | Aga Ab | TV receiver with keyed gain control |
| US4262812A (en) * | 1978-04-10 | 1981-04-21 | Bremenkamp John P | Tool apparatus for sprinkler systems |
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