GB790225A - Improvements in or relating to television receivers - Google Patents
Improvements in or relating to television receiversInfo
- Publication number
- GB790225A GB790225A GB3630154A GB3630154A GB790225A GB 790225 A GB790225 A GB 790225A GB 3630154 A GB3630154 A GB 3630154A GB 3630154 A GB3630154 A GB 3630154A GB 790225 A GB790225 A GB 790225A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- resistor
- rectifier
- dec
- 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
- H04N5/50—Tuning indicators; Automatic tuning control
- H04N5/505—Invisible or silent tuning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
790,225. Automatic gain control. PYE, Ltd. Dec. 16, 1955 [Dec. 15, 1954], No. 36301/54. Class 40 (5). In a television receiver with automatic gain control of the " gated " type, the gain of the video channel is reduced until the H.T. efficiency diode comes into operation. In an arrangement as described in Specification 777,801, in which pulses produced by a sampling diode V1 are amplified by a valve V2 and rectified by a diode V3 and form, after smoothing, the A.G.C. potential, a resistor R3 and rectifier M1 are connected in series between the anode of the diode V3 and earth. The anode of rectifier M1 is connected by one resistor R1, to the line output transformer T1 and by another resistor R2 to a source of negative potential; until the efficiency diode V5 becomes operative, the rectifier M1 is biased so as to be non-conductive and a negative bias is applied to the A.G.C. line via resistor R3. Overload before the A.G.C. is operative is thereby prevented. The negative potential may be derived from the grid circuit of the line output valve V4 or alternatively (Fig. 1, not shown) from the sound A.G.C. circuit. Alternatively, or in addition, the screen grids of valves in the video channel may be fed via a potentiometer from the boost voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3630154A GB790225A (en) | 1954-12-15 | 1954-12-15 | Improvements in or relating to television receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3630154A GB790225A (en) | 1954-12-15 | 1954-12-15 | Improvements in or relating to television receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB790225A true GB790225A (en) | 1958-02-05 |
Family
ID=10386874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3630154A Expired GB790225A (en) | 1954-12-15 | 1954-12-15 | Improvements in or relating to television receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB790225A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1214267B (en) * | 1960-12-28 | 1966-04-14 | Blaupunkt Werke Gmbh | TV receiver with two rectifier lines |
| DE1243717B (en) * | 1961-01-20 | 1967-07-06 | Grundig Max | Circuit arrangement for overload protection of the picture intermediate frequency amplifier tubes in a television receiver |
-
1954
- 1954-12-15 GB GB3630154A patent/GB790225A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1214267B (en) * | 1960-12-28 | 1966-04-14 | Blaupunkt Werke Gmbh | TV receiver with two rectifier lines |
| DE1243717B (en) * | 1961-01-20 | 1967-07-06 | Grundig Max | Circuit arrangement for overload protection of the picture intermediate frequency amplifier tubes in a television receiver |
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