GB856016A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB856016A
GB856016A GB1319557A GB1319557A GB856016A GB 856016 A GB856016 A GB 856016A GB 1319557 A GB1319557 A GB 1319557A GB 1319557 A GB1319557 A GB 1319557A GB 856016 A GB856016 A GB 856016A
Authority
GB
United Kingdom
Prior art keywords
valve
voltage
gain
potentiometer
varying
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
Application number
GB1319557A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken AG
Original Assignee
Telefunken AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
Publication of GB856016A publication Critical patent/GB856016A/en
Expired legal-status Critical Current

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
    • H04N5/57—Control of contrast or brightness

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)

Abstract

856,016. Television. TELEFUNKEN G.m.b.H. April 25, 1957 [April 25, 1956], No. 13195/57. Class 40(3). [Also in Group XL(c)] The gain of the video amplifier valve of a television receiver is varied by adjusting the potential of an electrode of a further valve connected in series with an electrode of the amplifier valve and consequent changes in picture brightness are compensated by applying a voltage derived from the anode circuit of the futher valve to an electrode of the cathode-ray tube. In Fig. 2 the gain of the video amplifier 1 of a television receiver is controlled by varying a potentiometer 15 so as to vary the impedance of a valve 12 connected in the screen grid circuit of the video amplifier valve 1. Variation of potentiometer 15 also varies the voltage across a potentiometer 16 so as to maintain the brightness constant as the contrast is adjusted. Synchronizing pulses developed across resistor 5 are applied to the cathode of a valve 6, the anode of which receives keying pulses so that a voltage is developed across a capacitor 8 for automatic gain control. The maximum amplitude of the video signal from valve 1 depends upon the screen potential of the valve so that varying the gain by varying the screen voltage also varies the level at which the valve limits interference.
GB1319557A 1956-04-25 1957-04-25 Improvements in or relating to television receivers Expired GB856016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET12148A DE1014159B (en) 1956-04-25 1956-04-25 Circuit arrangement for contrast control in television receivers

Publications (1)

Publication Number Publication Date
GB856016A true GB856016A (en) 1960-12-14

Family

ID=7546926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1319557A Expired GB856016A (en) 1956-04-25 1957-04-25 Improvements in or relating to television receivers

Country Status (2)

Country Link
DE (1) DE1014159B (en)
GB (1) GB856016A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644231A (en) * 1984-11-29 1987-02-17 Rca Corporation Video data display driver stage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259934B (en) * 1958-06-14 1968-02-01 Philips Patentverwaltung Television receiver circuit arrangement for the simultaneous control of contrast and basic brightness

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE476128A (en) * 1939-02-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644231A (en) * 1984-11-29 1987-02-17 Rca Corporation Video data display driver stage

Also Published As

Publication number Publication date
DE1014159B (en) 1957-08-22

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