GB692543A - Improvements relating to non-linear electrical circuits - Google Patents

Improvements relating to non-linear electrical circuits

Info

Publication number
GB692543A
GB692543A GB10954/48A GB1095448A GB692543A GB 692543 A GB692543 A GB 692543A GB 10954/48 A GB10954/48 A GB 10954/48A GB 1095448 A GB1095448 A GB 1095448A GB 692543 A GB692543 A GB 692543A
Authority
GB
United Kingdom
Prior art keywords
resistor
output
valve
circuit
linear
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
GB10954/48A
Inventor
Eric Lawrence Casling White
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB10954/48A priority Critical patent/GB692543A/en
Priority to FR984893D priority patent/FR984893A/en
Publication of GB692543A publication Critical patent/GB692543A/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
    • H04N5/202—Gamma control
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Picture Signal Circuits (AREA)

Abstract

692,543. Electric analogue calculating systems. ELECTRIC & MUSICAL INDUSTRIES, Ltd. April 5, 1949 [April 21, 1948], No. 10954/48. Class 37. [Also in Group XL (c)] In a circuit of adjustable non-linearity for " gamma " correction in television equipment, following a variable fractional power law, the video signal is fed to an impedance network comprising a linear and a non-linear impedance and means are provided for adjustably weighting the output in favour of one or the other response to obtain the desired law. The output of a cathode follower circuit 1, 6 following the head amplifier of a television camera is fed to the input of the succeeding valve 11 through a circuit comprising a resistor 9, an adjustable portion of which is shunted to earth through a diode or a tetrode valve 20 acting as a non- linear resistor. The output from the circuit is applied to the following circuit 19 through resistor 15 and capacitor 17 which also applies negative feed-back to the grid of valve 11 to reduce the input impedance. Resistance 7 is adjusted conjointly with the tapping on resistor 9 to maintain a constance peak-to-peak output amplitude. The output valve may be dispensed with in which case the output is derived from the junction of resistors 8 and 9 and the other end of resistor 9 is earthed. In an alternative arrangement similar to that described in Specification 536,089, Fig. 2 (not shown), the non-linear resistor is connected across an adjustable portion of the load resistor of a high impedance valve and the output is derived from a potentiometer connected across the whole of the anode load adjusted conjointly with the adjustment of the load resistor tap.
GB10954/48A 1948-04-21 1948-04-21 Improvements relating to non-linear electrical circuits Expired GB692543A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB10954/48A GB692543A (en) 1948-04-21 1948-04-21 Improvements relating to non-linear electrical circuits
FR984893D FR984893A (en) 1948-04-21 1949-04-21 Electric regulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10954/48A GB692543A (en) 1948-04-21 1948-04-21 Improvements relating to non-linear electrical circuits

Publications (1)

Publication Number Publication Date
GB692543A true GB692543A (en) 1953-06-10

Family

ID=9977365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10954/48A Expired GB692543A (en) 1948-04-21 1948-04-21 Improvements relating to non-linear electrical circuits

Country Status (2)

Country Link
FR (1) FR984893A (en)
GB (1) GB692543A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248095B (en) * 1959-04-07 1967-08-24 Standard Elektrik Lorenz Ag Process for influencing the course of contrast when reproducing television images

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248095B (en) * 1959-04-07 1967-08-24 Standard Elektrik Lorenz Ag Process for influencing the course of contrast when reproducing television images

Also Published As

Publication number Publication date
FR984893A (en) 1951-07-11

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