GB894718A - Improvements in or relating to electrical voltage modifying networks - Google Patents

Improvements in or relating to electrical voltage modifying networks

Info

Publication number
GB894718A
GB894718A GB32893/57A GB3289357A GB894718A GB 894718 A GB894718 A GB 894718A GB 32893/57 A GB32893/57 A GB 32893/57A GB 3289357 A GB3289357 A GB 3289357A GB 894718 A GB894718 A GB 894718A
Authority
GB
United Kingdom
Prior art keywords
output
potentiometer
discriminator
input
adding device
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
GB32893/57A
Inventor
John Charles Oliver Rochester
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB32893/57A priority Critical patent/GB894718A/en
Priority to US767990A priority patent/US3089093A/en
Publication of GB894718A publication Critical patent/GB894718A/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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/26—Arbitrary function generators
    • G06G7/28—Arbitrary function generators for synthesising functions by piecewise approximation
    • 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)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Adjustable Resistors (AREA)

Abstract

894,718. Non-linear circuits. PLESSEY CO. Ltd. Oct. 17, 1958 [Oct. 22, 1957], No.32893/57. Class 40(6). Fig. 2 shows in schematic form a non-linear circuit for producing from an input signal applied at 1 an output signal which varies according to the function a, b, c shown in Fig. 1. The potentiometers P1, P2, P3 are set to produce three outputs having the slopes required for the parts a, b, c of the curves shown in Fig. T. The output from potentiometer P2 is supplied to an adding device Al to which is also applied a variable bias source from potentiometer P4 and the output from the adding device is applied to one input of a double diode discriminator tube V5 to the other input of which is applied the output from potentiometer P1. The discriminator V5 passes anode current only from that cathode which has the lower voltage applied to it. The third voltage derived from potentiometer P3 is applied to an adding device A2 to which a bias voltage derived from potentiometer P5 is also applied and the output of adder A2 is applied to one input of the double triode discriminator V6 to the other input of which is applied the output from discriminator V5. The output from the discriminator V6 will follow the more positive of the two inputs applied to it. In the circuit described, Fig. 3, for carrying this into effect, cathode follower isolater stages are provided between the various inputs and resistor networks provide the function of the adding circuits Al, A2 (Fig. 2).
GB32893/57A 1957-10-22 1957-10-27 Improvements in or relating to electrical voltage modifying networks Expired GB894718A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB32893/57A GB894718A (en) 1957-10-27 1957-10-27 Improvements in or relating to electrical voltage modifying networks
US767990A US3089093A (en) 1957-10-22 1958-10-17 Circuit for producing output signal as a function of plural, varied-sloped inputs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32893/57A GB894718A (en) 1957-10-27 1957-10-27 Improvements in or relating to electrical voltage modifying networks

Publications (1)

Publication Number Publication Date
GB894718A true GB894718A (en) 1962-04-26

Family

ID=10345614

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32893/57A Expired GB894718A (en) 1957-10-22 1957-10-27 Improvements in or relating to electrical voltage modifying networks

Country Status (1)

Country Link
GB (1) GB894718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5384322U (en) * 1976-12-13 1978-07-12

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5384322U (en) * 1976-12-13 1978-07-12

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