GB420727A - Improvements in or relating to television and like systems - Google Patents

Improvements in or relating to television and like systems

Info

Publication number
GB420727A
GB420727A GB34273/33A GB3427333A GB420727A GB 420727 A GB420727 A GB 420727A GB 34273/33 A GB34273/33 A GB 34273/33A GB 3427333 A GB3427333 A GB 3427333A GB 420727 A GB420727 A GB 420727A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
rectifier
dec
television
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
GB34273/33A
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Publication of GB420727A publication Critical patent/GB420727A/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
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

Abstract

420,727. Television; valve amplifying circuits. FERNSEH AKT.-GES., Goerzallee, Zehlendorf, Berlin. Dec. 6, 1933, No. 34273. Convention date, Dec. 6, 1932. [Classes 40 (iii) and 40 (v)] A correct mean brightness of a reproduced picture, relative to the brightest and darkest tones is maintained automatically. The mean brightness of a light source or relay 11 is regulated by automatically regulating the grid bias of the valve 10 feeding the source by a voltage derived from a previous valve 4 amplifying the received signals. The output of this valve passes through a rectifier 14 to develop a potential on the grid of an extra valve 19 and thus vary its anode current. The anode circuit contains a resistance 21 which also lies in the grid circuit of the valve 10. The rectifier is associated with a leaky condenser 18, 17 with a time constant such that variations in the mean value of the signal are not operative until they have lasted for a small plurality of pictures.
GB34273/33A 1932-12-06 1933-12-06 Improvements in or relating to television and like systems Expired GB420727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE420727X 1932-12-06

Publications (1)

Publication Number Publication Date
GB420727A true GB420727A (en) 1934-12-06

Family

ID=6453484

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34273/33A Expired GB420727A (en) 1932-12-06 1933-12-06 Improvements in or relating to television and like systems

Country Status (2)

Country Link
FR (1) FR764998A (en)
GB (1) GB420727A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753789C (en) * 1935-03-09 1952-11-17 Siemens & Halske A G Circuit arrangement for influencing the settling and decay times of an electrical circuit

Also Published As

Publication number Publication date
FR764998A (en) 1934-05-31

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