GB715331A - Improvements in or relating to television receivers - Google Patents
Improvements in or relating to television receiversInfo
- Publication number
- GB715331A GB715331A GB1862451A GB1862451A GB715331A GB 715331 A GB715331 A GB 715331A GB 1862451 A GB1862451 A GB 1862451A GB 1862451 A GB1862451 A GB 1862451A GB 715331 A GB715331 A GB 715331A
- Authority
- GB
- United Kingdom
- Prior art keywords
- potential
- derived
- black level
- pulses
- stabilized
- 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
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000004804 winding 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
- H04N5/53—Keyed automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Picture Signal Circuits (AREA)
Abstract
715,331. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 20, 1952 [Aug. 7, 1951], No. 18624/51. Class 40 (3). [Also in Group XL(c)] In a television receiver automatic gain control (A.G.C.) is obtained by clamping the black level at a pre-determined value and deriving an A.G.C. potential dependent upon the amplitude of the synchronizing pulses in the clamped signal. The composite demodulated signal is applied over an amplifier to the grid E of the picture-tube, via a blocking condenser C1. The black level is stabilized at earth potential by means of diodes D1, 2, which are biased to be non-conductive save during the " back-porch " period, the gating means comprising negative-going pulses derived from a winding L1 on the line output transformer. The gating pulses are suitably delayed by means of a time-delay network comprising inductance L2, condensers C2, 3 and terminating resistances R5, 6. The A.G.C. potential is derived in accordance with the synch. signal amplitude by means of a peak-rectifying diode D3, part only of the D.C. output being utilized by means of a potentiometer R7, 8. In an alternative embodiment, Fig. 2 (not shown) in which the picture tube is cathode modulated, the black level is stabilized at the grid of the video amplifier and the A.G.C. potential derived at this point.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1862451A GB715331A (en) | 1951-08-07 | 1951-08-07 | Improvements in or relating to television receivers |
| DEM14969A DE958121C (en) | 1951-08-07 | 1952-07-31 | Circuit for generating a fading control voltage in television receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1862451A GB715331A (en) | 1951-08-07 | 1951-08-07 | Improvements in or relating to television receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB715331A true GB715331A (en) | 1954-09-15 |
Family
ID=10115656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1862451A Expired GB715331A (en) | 1951-08-07 | 1951-08-07 | Improvements in or relating to television receivers |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE958121C (en) |
| GB (1) | GB715331A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE535502A (en) * | 1954-02-09 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE486285A (en) * | 1947-12-13 | |||
| NL150569B (en) * | 1948-12-18 | Bestobell Establishment | CONDENSATION TRAY WITH BIMETAL CONTROLLED VALVE. |
-
1951
- 1951-08-07 GB GB1862451A patent/GB715331A/en not_active Expired
-
1952
- 1952-07-31 DE DEM14969A patent/DE958121C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE958121C (en) | 1957-02-14 |
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