GB781893A - Switching circuit for a two-mode synchronizing system in a color-television receiver - Google Patents

Switching circuit for a two-mode synchronizing system in a color-television receiver

Info

Publication number
GB781893A
GB781893A GB22940/55A GB2294055A GB781893A GB 781893 A GB781893 A GB 781893A GB 22940/55 A GB22940/55 A GB 22940/55A GB 2294055 A GB2294055 A GB 2294055A GB 781893 A GB781893 A GB 781893A
Authority
GB
United Kingdom
Prior art keywords
synchronism
detector
tube
phase
filter
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
GB22940/55A
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine Corp
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 Hazeltine Corp filed Critical Hazeltine Corp
Publication of GB781893A publication Critical patent/GB781893A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/027—Scoring tool holders; Driving mechanisms therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/033—Apparatus for opening score lines in glass sheets
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

781,893. Television. HAZELTINE CORPORATION. Aug. 9, 1955 [Aug. 10, 1954], No. 22940/55. Class 40 (3). [Also in Group XXXV] In a colour television system a single switching tube 30 changes over the action of the lowpass filter 27 of the automatic frequency and phase-control system for the colour reference oscillator 21 from rapid pull-in to relatively noise-free hold-in condition and in the former condition simultaneously disables the chrominance channel amplifier 19. As shown, quadrature and in-phase signals are applied from the reference colour generator 21 respectively to an A.P.C. phase detector 26 with output filter 37, 38, 39, and to a synchronism detector 29. During out of synchronism condition a voltage is derived from synchronism detector 29 to render conducting a normally blocked switching tube 30 forming part of a low-impedance alternating current path 40, 42, 43, partly shunting the A.P.C. filter 37, 38, 39, to increase the control sensitivity of the retroactive loop acting on the oscillator 21 through a reactance circuit 28 and, at the same time, anode current of the tube 30 applies negative bias to an R-C circuit 45, 46 in the grid circuit of the chrominance amplifier 19 to disable it so that only a monochrome picture is displayed. During synchronism a negative voltage from detector 19 blocks the tube 19 so that the A.P.C. filter 37-39 is not shunted and the chrominance amplifier again is operative. In a modification the H.T. operating voltage for the tube 30 is derived, not from the cathode of the amplifier 19, but from a rectifier, energized by line flyback pulses, deriving a negative voltage applied to the cathode of the tube 30. The synchronism detector 29 may be a phase detector of the balanced diode type, energized at burst repetition frequency, but producing a D.C. output only at phase quadrature synchronism.
GB22940/55A 1954-08-10 1955-08-09 Switching circuit for a two-mode synchronizing system in a color-television receiver Expired GB781893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US781893XA 1954-08-10 1954-08-10

Publications (1)

Publication Number Publication Date
GB781893A true GB781893A (en) 1957-08-28

Family

ID=22142491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22940/55A Expired GB781893A (en) 1954-08-10 1955-08-09 Switching circuit for a two-mode synchronizing system in a color-television receiver

Country Status (3)

Country Link
DE (1) DE1008353B (en)
FR (1) FR1135823A (en)
GB (1) GB781893A (en)

Also Published As

Publication number Publication date
FR1135823A (en) 1957-05-03
DE1008353B (en) 1957-05-16

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