GB525049A - Improvements in time-bases for television receivers and like purposes - Google Patents

Improvements in time-bases for television receivers and like purposes

Info

Publication number
GB525049A
GB525049A GB467239A GB467239A GB525049A GB 525049 A GB525049 A GB 525049A GB 467239 A GB467239 A GB 467239A GB 467239 A GB467239 A GB 467239A GB 525049 A GB525049 A GB 525049A
Authority
GB
United Kingdom
Prior art keywords
grid
control grid
secondary winding
cathode
anode
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
GB467239A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB467239A priority Critical patent/GB525049A/en
Publication of GB525049A publication Critical patent/GB525049A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
    • H03K4/32—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
    • H03K4/34—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses using a single tube with positive feedback through a transformer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

525,049. Television. GENERAL ELECTRIC CO., Ltd., CLAYTON, R. J., and EDWARDS, G. W. Feb. 13, 1939, No. 4672. [Classes 40 (iii) and 40 (v)] Disturbance between the line and frame time bases due to capacity coupling between the electrodes of a valve generating saw-tooth oscillations is compensated for by connecting the control grid to some other point in such a way that a voltage is applied to the control grid equal and opposite to the disturbing voltage. In the arrangement shown line-frequency saw-tooth oscillations are generated by means of a tetrode valve 1, of which the anode 3 is connected through the primary winding 6 of a transformer and a variable resistance 7 to the positive H.T. supply. A tapping on the secondary winding 8 of the transformer is connected in series with the biassing circuit 9 to the cathode 2, one end of the winding 8 being connected to the grid 5. The output circuit 10 is connected across part of the secondary winding 8. The control grid 4 is connected to the cathode 2 by a grid leak 11 and by a lead 12 to the common source of synchronizing signals. To prevent oscillations from reaching the lead 12 through the capacity 13 between the grids 5, 4, a condenser 15 is connected between the control grid 4 and the end of the secondary winding 8 remote from the grid 5. By varying the portion of the secondary winding 8 included in series with the compensating condenser 15, the magnitude and phase of the voltage applied to the grid 4 may be adjusted. In a modification the cathode 2 is connected through the biassing circuit 9 to the upper end of the secondary winding 8, and the compensating condenser 15 is connected directly between the control grid 4 and anode 3. In another arrangement the saw-tooth oscillations generated in the valve 1 are applied to an amplifier and the compensating condenser is connected between the control grid 4 and a point in the anode circuit of the amplifier. Specification 494,677 is referred to.
GB467239A 1939-02-13 1939-02-13 Improvements in time-bases for television receivers and like purposes Expired GB525049A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB467239A GB525049A (en) 1939-02-13 1939-02-13 Improvements in time-bases for television receivers and like purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB467239A GB525049A (en) 1939-02-13 1939-02-13 Improvements in time-bases for television receivers and like purposes

Publications (1)

Publication Number Publication Date
GB525049A true GB525049A (en) 1940-08-21

Family

ID=9781599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB467239A Expired GB525049A (en) 1939-02-13 1939-02-13 Improvements in time-bases for television receivers and like purposes

Country Status (1)

Country Link
GB (1) GB525049A (en)

Similar Documents

Publication Publication Date Title
GB515362A (en) Improvements in or relating to the transmission of electrical signals having a direct current component
GB558884A (en) High-voltage direct current supply system
GB694835A (en) Improvements in or relating to circuit-arrangements in which a signal is supplied toa control device
GB505490A (en) Improvements in or relating to cathode ray tube television and like apparatus
US2944186A (en) Circuit arrangement for producing a sawtooth current in a coil
GB441761A (en) Improvements in or relating to the method and means for the synchronisation of television receivers by the transmitter
GB524039A (en) Improvements in arrangements for generating electric currents of saw-tooth wave form
GB468905A (en) Level-maintenance for television amplifiers
GB525049A (en) Improvements in time-bases for television receivers and like purposes
US2178012A (en) Thermionic valve circuits
US2175335A (en) Television synchronizing circuits
US2282130A (en) Thermionic generator of alternating current
US2646532A (en) System for generating a periodic scanning current
GB545756A (en) Video-frequency signal-translating system for television receivers
GB423394A (en) Improvements in relaxation oscillation generators
US2460601A (en) Cathode-ray tube deflecting system
US2917659A (en) Television receiver apparatus
US3740472A (en) Width control circuit for a television receiver
US2566056A (en) Keystone correction circuit
GB380144A (en) Improvements in and relating to thermionic valves and circuits for the generation, modulation and controlling of electric oscillations
US2254025A (en) Saw-tooth wave generator
GB564250A (en) Improvements in or relating to thermionic valve amplifier circuit arrangements
US2809327A (en) Horizontal magnetic deflection system for television receivers
GB639531A (en) Improvements in scanning circuits for television receivers
GB425685A (en) Method of producing relaxation oscillations, more particularly for television purposes