GB534749A - Improvements in or relating to the frequency control of oscillators and particularly to television systems - Google Patents

Improvements in or relating to the frequency control of oscillators and particularly to television systems

Info

Publication number
GB534749A
GB534749A GB28780/39A GB2878039A GB534749A GB 534749 A GB534749 A GB 534749A GB 28780/39 A GB28780/39 A GB 28780/39A GB 2878039 A GB2878039 A GB 2878039A GB 534749 A GB534749 A GB 534749A
Authority
GB
United Kingdom
Prior art keywords
condenser
voltage
oscillator
impulses
oscillators
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
GB28780/39A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB534749A publication Critical patent/GB534749A/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
    • H04N5/04—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
    • H04N5/126—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 indirectly commands a frequency generator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/24—Automatic control of frequency or phase; Synchronisation using a reference signal directly applied to the generator

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

534,749. Measuring phase difference. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 26, 1939, No. 28780. Convention date, Oct. 26, 1938. [Class 37] [Also in Group XXXV] A condenser 29, across which a voltage depending on the phase difference between the output of an oscillator 10 and a reference oscillation is to appear, is charged through a rectifier 26 by impulses from a composite wave representing the source of the reference frequency, which may be that of a power line, and a frequency preferably in harmonic relation thereto derived by reduction from the oscillator. The condenser can discharge' where the amplitude of the composite wave falls, but only during the impulses. Between impulses the voltage remains constant. The discharge circuit includes a rectifier 31 and a resistor 36 ; its impedance remains high until the cut-off bias on the grid 33 is held off due to a connection from the oscillator through condenser 42 but is always high in relation to the impedance of the charging circuit. The voltage of condenser 29 thus changes with changes in the relative phase of the two oscillators. As shown the voltage of condenser 29 is arranged to vary the bias voltage of the grid of a variable-Á valve 46 acting as a reactive circuit in parallel with' the tuning inductance to control the oscillator. Specification 458,161, [Group XXXV], is referred to.
GB28780/39A 1938-10-26 1939-10-26 Improvements in or relating to the frequency control of oscillators and particularly to television systems Expired GB534749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US237052A US2201978A (en) 1938-10-26 1938-10-26 Frequency control circuits

Publications (1)

Publication Number Publication Date
GB534749A true GB534749A (en) 1941-03-17

Family

ID=22892146

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28780/39A Expired GB534749A (en) 1938-10-26 1939-10-26 Improvements in or relating to the frequency control of oscillators and particularly to television systems

Country Status (3)

Country Link
US (1) US2201978A (en)
FR (1) FR989233A (en)
GB (1) GB534749A (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425657A (en) * 1941-04-17 1947-08-12 Rca Corp Short-wave apparatus
US2422386A (en) * 1943-11-22 1947-06-17 Rca Corp Frequency measurement
US2495708A (en) * 1944-03-24 1950-01-31 Rupert H Draeger Electrically controlled flicker fusion testing apparatus
US2458156A (en) * 1944-07-29 1949-01-04 Rca Corp Automatic frequency control system
US2507317A (en) * 1944-09-23 1950-05-09 Philco Corp Method and apparatus for synchronizing oscillators
US2958767A (en) * 1944-10-02 1960-11-01 Itt Frequency controlling system
BE476462A (en) * 1945-02-22
US2499514A (en) * 1945-02-27 1950-03-07 Rca Corp Beat frequency sweep oscillator
US2612601A (en) * 1945-05-14 1952-09-30 Glenn H Musselman Pulse transmitter synchronizing system
US2671897A (en) * 1945-07-03 1954-03-09 Roger B Woodbury Automatically synchronized long range navigation pulse transmitter
US2690557A (en) * 1945-09-18 1954-09-28 Glenn H Musselman Long-range navigation system
US2521058A (en) * 1946-05-28 1950-09-05 Bendix Aviat Corp Frequency and phase control system
US2532063A (en) * 1946-09-07 1950-11-28 Rca Corp Position indicating system
US2581589A (en) * 1946-12-12 1952-01-08 Rca Corp Position indicating system
FR963218A (en) * 1947-03-20 1950-07-01
FR972594A (en) * 1948-09-27 1951-01-31
US2503105A (en) * 1947-09-30 1950-04-04 Rca Corp Automatic frequency control
US2633538A (en) * 1947-10-31 1953-03-31 Rca Corp Beam deflection control
US2670438A (en) * 1948-07-10 1954-02-23 Motorola Inc Automatic frequency control circuit
US2786400A (en) * 1949-10-05 1957-03-26 Time Inc Justifying and character positioning apparatus for electronic photo-typecomposing system
US2752497A (en) * 1949-11-08 1956-06-26 Hartford Nat Bank & Trust Co Developing electrical oscillation
BE500219A (en) * 1949-12-30
US2565896A (en) * 1949-12-31 1951-08-28 Rca Corp Synchronizing circuits
GB701785A (en) * 1950-04-25 1954-01-06 Emi Ltd Improvements relating to the synchronising of generated pulses or oscillations
US2674916A (en) * 1950-07-26 1954-04-13 Rca Corp Variable quantity evaluator having light sensing means
US2761972A (en) * 1953-03-10 1956-09-04 Thompson Prod Inc Frequency stabilizing circuit
US3181077A (en) * 1961-05-01 1965-04-27 Gen Precision Inc Grating generator

Also Published As

Publication number Publication date
FR989233A (en) 1951-09-06
US2201978A (en) 1940-05-28

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