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GB693895A - Improvements relating to electronic switching circuits - Google Patents

Improvements relating to electronic switching circuits

Info

Publication number
GB693895A
GB693895A GB2678649A GB2678649A GB693895A GB 693895 A GB693895 A GB 693895A GB 2678649 A GB2678649 A GB 2678649A GB 2678649 A GB2678649 A GB 2678649A GB 693895 A GB693895 A GB 693895A
Authority
GB
United Kingdom
Prior art keywords
conducting
diode
valve
pulses
signals
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
GB2678649A
Inventor
Ronald Thomas Clayden
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
Priority to NL74481D priority Critical patent/NL74481C/xx
Priority to NL7112326.A priority patent/NL156609B/en
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2678649A priority patent/GB693895A/en
Priority to DEE2797A priority patent/DE944798C/en
Priority to FR1026106D priority patent/FR1026106A/en
Publication of GB693895A publication Critical patent/GB693895A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/54—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements of vacuum tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/268—Signal distribution or switching

Landscapes

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

Abstract

693,895. Television. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Sept. 27, 1950 [Oct. 19, 1949], No. 26786/49. Class 40 (vi). In an electronic switching circuit, particularly for inserting blanking pulses or other suppression pulses into a television waveform and comprising a diode valve which may be switched selectively to a conducting or to a non-conducting condition, means are provided for supplying a biasing current to the diode when in its conducting condition so that the application thereto of zero-amplitude signals, i.e. signals giving rise to an output equal to that obtained when the diode is non-conducting, does not cause the diode to operate at or near its cut-off point. In the arrangement shown, television picture signals from a source 4 are fed to a load comprising two equal resistances 3, 14 by transmission through diodes 5 and 6 which are periodically rendered non-conducting (e.g. at blanking intervals) under the control of switching pulses from source 13, which pulses render valve 9 conducting and thus the diodes 5, 6 non- conducting by causing the potential of the diode anodes to fall below that of earth (the line 12 being negative with respect to earth). To ensure that the diode 6 operates over a linear portion of its characteristic when the potential of the signals at the cathode of valve 2 falls to zero or lower, a further valve 11 is arranged to conduct when valve 9 is non-conducting (and vice versa), whereby its anode current, dividing between the equal resistances 3, 14, supplies a biasing current for diode 6 which causes it to operate on a linear portion of its characteristic. Specifications 682,159, [Group XL (b)], and 693,893 are referred to.
GB2678649A 1949-10-19 1949-10-19 Improvements relating to electronic switching circuits Expired GB693895A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL74481D NL74481C (en) 1949-10-19
NL7112326.A NL156609B (en) 1949-10-19 PROCESS FOR THE REMOVAL OF POLLUTANTS FROM A MIXTURE CONTAINING PRECIOUSLY OF HYDROCARBONS.
GB2678649A GB693895A (en) 1949-10-19 1949-10-19 Improvements relating to electronic switching circuits
DEE2797A DE944798C (en) 1949-10-19 1950-10-11 Arrangement for controlling circuits through electron tubes
FR1026106D FR1026106A (en) 1949-10-19 1950-10-18 Electronic switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2678649A GB693895A (en) 1949-10-19 1949-10-19 Improvements relating to electronic switching circuits

Publications (1)

Publication Number Publication Date
GB693895A true GB693895A (en) 1953-07-08

Family

ID=10249174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2678649A Expired GB693895A (en) 1949-10-19 1949-10-19 Improvements relating to electronic switching circuits

Country Status (4)

Country Link
DE (1) DE944798C (en)
FR (1) FR1026106A (en)
GB (1) GB693895A (en)
NL (2) NL156609B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2356141A (en) * 1942-07-31 1944-08-22 Philco Radio & Television Corp Synchronizing circuit
US2548436A (en) * 1946-01-25 1951-04-10 Hazeltine Corp Television receiver background control circuit

Also Published As

Publication number Publication date
DE944798C (en) 1956-06-21
NL74481C (en)
FR1026106A (en) 1953-04-23
NL156609B (en)

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