GB726134A - Gamma correcting and frequency compensating circuit - Google Patents

Gamma correcting and frequency compensating circuit

Info

Publication number
GB726134A
GB726134A GB15567/53A GB1556753A GB726134A GB 726134 A GB726134 A GB 726134A GB 15567/53 A GB15567/53 A GB 15567/53A GB 1556753 A GB1556753 A GB 1556753A GB 726134 A GB726134 A GB 726134A
Authority
GB
United Kingdom
Prior art keywords
gamma
resistor
compensating circuit
effected
gamma correcting
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
GB15567/53A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB726134A publication Critical patent/GB726134A/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
    • H04N5/20—Circuitry for controlling amplitude response
    • 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
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

726,134. Non-linear valve circuits. STANDARD TELEPHONES & CABLES, Ltd. June 5, 1953 [July 26, 1952], No. 15567/53. Class 40 (6). In a gamma correction circuit as used in a television system, correction is effected in the lower and middle frequencies and frequency compensation effected at the higher frequencies. A negative-going sawtooth 9 from a pick-up device 10, Fig. 5, D.C. restored by valve 8, is applied over cathode follower 7 to an attenuator comprising resistor 4 and a germanium diode 1 which is biased by the voltage drop over resistors 14, 15 to give an output waveform 12. At the higher frequencies, capacitor 5 reduces the attenuation caused by resistor 4. The gamma of the circuit may be changed by varying resistors 15, 4.
GB15567/53A 1952-07-26 1953-06-05 Gamma correcting and frequency compensating circuit Expired GB726134A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US324096XA 1952-07-26 1952-07-26

Publications (1)

Publication Number Publication Date
GB726134A true GB726134A (en) 1955-03-16

Family

ID=21864816

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15567/53A Expired GB726134A (en) 1952-07-26 1953-06-05 Gamma correcting and frequency compensating circuit

Country Status (4)

Country Link
CH (1) CH324096A (en)
DE (1) DE955778C (en)
FR (1) FR1087866A (en)
GB (1) GB726134A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160494B (en) * 1962-09-01 1964-01-02 Fernseh Gmbh Circuit arrangement for changing the transmission characteristics of a transistor video amplifier
US3655916A (en) * 1970-01-15 1972-04-11 Sylvania Electric Prod Gamma correcting photoelectric transducer circuitry

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514401A (en) * 1938-05-04 1939-11-07 Baird Television Ltd Improvements in or relating to television and like systems
GB683605A (en) * 1948-04-21 1952-12-03 Emi Ltd Improvements relating to television apparatus employing non-linear circuits

Also Published As

Publication number Publication date
DE955778C (en) 1957-01-10
FR1087866A (en) 1955-03-01
CH324096A (en) 1957-08-31

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