GB630871A - Improvements in oscillation generator systems - Google Patents

Improvements in oscillation generator systems

Info

Publication number
GB630871A
GB630871A GB25978/46A GB2597846A GB630871A GB 630871 A GB630871 A GB 630871A GB 25978/46 A GB25978/46 A GB 25978/46A GB 2597846 A GB2597846 A GB 2597846A GB 630871 A GB630871 A GB 630871A
Authority
GB
United Kingdom
Prior art keywords
frequency
produce
pulses
valve
wave
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
GB25978/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB630871A publication Critical patent/GB630871A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/04Synchronising
    • H04N5/06Generation of synchronising signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Particle Accelerators (AREA)
  • Details Of Television Scanning (AREA)

Abstract

630,871. Automatic frequency-control systems. FRANCE, H. G. DE. Aug. 29, 1946, Nos. 25978 and 25979. Convention dates, March 12, 1941, and July 5, 1941. [Class 38 (iv)] [Also in Group XL (c)] The line frequency generator of a television receiver is maintained constant with respect to the supply frequency by dividing down in a series of relaxation oscillators and compounding the frame frequency pulses and the supply to produce a potential for controlling each oscillator. Fig. 1 shows an arrangement in which a hard valve saw-tooth generator I of the Puckle type produces a saw-tooth of line frequency which synchronizes through a valve 6 the first generator II of a series of similar generators dividing down to frame frequency. The frequencies of the system can be adjusted so that the frame frequency is approximately that of the mains by adjusting potentiometer 7 controlling the screen potential of constant current pentodes 2, 2<1>. The system is locked .on to the mains by adding frame frequency pulses to a supply frequency wave in a device 8 to produce a wave which is rectified to produce a bias proportional to the phase difference between the wave and the pulses by circuit 10, 11 and is then applied to the control grids of the constant current pentodes 2, 2<1>. The operation of the divider chain is checked by connecting the outputs of successive stages to the X and Y-plates of a C.R. tube to produce a trace analagous to Lissajons, Fig. 6 (not shown). Thyratron generators may replace the hard valve generators, Figs. 7 and 8 (not shown), synchronizing pulses for successive stages being derived from resistors in the' cathode leads of the previous valve in these embodiments.
GB25978/46A 1941-03-12 1946-08-29 Improvements in oscillation generator systems Expired GB630871A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR232477X 1941-03-12
FR50741X 1941-07-05

Publications (1)

Publication Number Publication Date
GB630871A true GB630871A (en) 1949-10-24

Family

ID=26182795

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25978/46A Expired GB630871A (en) 1941-03-12 1946-08-29 Improvements in oscillation generator systems

Country Status (4)

Country Link
US (1) US2420303A (en)
CH (1) CH232477A (en)
DE (1) DE966446C (en)
GB (1) GB630871A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492018A (en) * 1944-11-11 1949-12-20 Philco Corp Synchronizing system for sawtooth wave generators
US2553059A (en) * 1945-08-08 1951-05-15 Chrysler Corp Synchronizer
US2477076A (en) * 1945-10-12 1949-07-26 Bell Telephone Labor Inc Frequency control system
US2480599A (en) * 1945-11-30 1949-08-30 Oxford Alan John Henry Interference suppression system for radio receivers and the like
US2604515A (en) * 1946-10-17 1952-07-22 Bendix Aviat Corp Electrical circuit analyzing apparatus
US2997662A (en) * 1947-07-09 1961-08-22 Wendell R Garner Noise frequency-modulated pulse generator
US2517703A (en) * 1947-07-25 1950-08-08 Franklin F Offner Synchronizing apparatus
US2593842A (en) * 1947-08-13 1952-04-22 Du Mont Allen B Lab Inc Phase discriminator
NL88575C (en) * 1947-09-27
US2522124A (en) * 1947-10-08 1950-09-12 Bell Telephone Labor Inc Frequency-controlled oscillator
US2694160A (en) * 1948-08-31 1954-11-09 Bell Telephone Labor Inc Expandable straight line trajectory radar and sonar indicator
US2674812A (en) * 1950-04-05 1954-04-13 Gen Precision Lab Inc Pattern target display
US2745099A (en) * 1951-05-10 1956-05-08 Waldon P Bollinger Sweep modulator direction finder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978684A (en) * 1928-11-09 1934-10-30 Associated Electric Lab Inc Television
BE402796A (en) * 1933-05-05
US2175033A (en) * 1938-05-18 1939-10-03 Loewe Opta Gmbh Picture transmission
US2245627A (en) * 1938-06-24 1941-06-17 Univ Leland Stanford Junior Stabilization of frequency
US2212648A (en) * 1939-01-28 1940-08-27 Rca Corp Synchronizing pulse generator

Also Published As

Publication number Publication date
US2420303A (en) 1947-05-13
DE966446C (en) 1957-08-08
CH232477A (en) 1944-05-31

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