GB909791A - Improvements in television receivers - Google Patents
Improvements in television receiversInfo
- Publication number
- GB909791A GB909791A GB2897/61A GB289761A GB909791A GB 909791 A GB909791 A GB 909791A GB 2897/61 A GB2897/61 A GB 2897/61A GB 289761 A GB289761 A GB 289761A GB 909791 A GB909791 A GB 909791A
- Authority
- GB
- United Kingdom
- Prior art keywords
- automatic gain
- gain control
- valve
- cathode
- 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
-
- 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)
- Details Of Television Systems (AREA)
- Control Of Amplification And Gain Control (AREA)
- Television Receiver Circuits (AREA)
Abstract
909,791. Automatic gain control. LOEWE OPTA A.G. Jan. 25, 1961 [Jan. 26, 1960], No. 2897/61. Class 40 (5). The invention relates to a television automatic gain control circuit of the " gated " type, in which positive-going pulses from the line output transformer are applied over condenser 12 to the anode circuit of an automatic gain control valve 8, the cathode of which is coupled by common resistor 9 to the cathode of video stage 5 and an automatic gain control voltage is taken from the anode of the valve 8. Such an arrangement is liable to overload during the initial starting period, since the line output is the last part of the receiver to become operative, and once overloaded cannot function since the modulation from which the automatic gain control is derived is removed in the overloaded stages. To prevent this, the grid of the control valve 8 is connected by lead 13 to the cathode of the last intermediate frequency stage 1. The cathode circuit of this valve includes decoupled resistor 15, and if the valve overloads its cathode current rises, applying a positive bias to the grid of control valve 8 which makes this valve conductive to generate an automatic gain control voltage as soon as the line output is present at its anode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL35205A DE1184792B (en) | 1960-01-26 | 1960-01-26 | Circuit arrangement for generating control voltage in television receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB909791A true GB909791A (en) | 1962-11-07 |
Family
ID=7266978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2897/61A Expired GB909791A (en) | 1960-01-26 | 1961-01-25 | Improvements in television receivers |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1184792B (en) |
| FR (1) | FR1280215A (en) |
| GB (1) | GB909791A (en) |
| NL (1) | NL260424A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2735002A (en) * | 1952-08-23 | 1956-02-14 | Sync separator and ago circuits for tv receivers | |
| US2889400A (en) * | 1955-05-13 | 1959-06-02 | Rca Corp | Strong signal lock-out prevention |
| FR1114362A (en) * | 1956-05-25 | 1956-04-11 | Int Standard Electric Corp | Television signal control device |
-
1960
- 1960-01-26 DE DEL35205A patent/DE1184792B/en active Pending
-
1961
- 1961-01-24 NL NL260424A patent/NL260424A/xx unknown
- 1961-01-25 FR FR850671A patent/FR1280215A/en not_active Expired
- 1961-01-25 GB GB2897/61A patent/GB909791A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1280215A (en) | 1961-12-29 |
| NL260424A (en) | 1964-04-27 |
| DE1184792B (en) | 1965-01-07 |
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