GB636575A - Improvements in or relating to automatic frequency synchronising circuit arrangements - Google Patents

Improvements in or relating to automatic frequency synchronising circuit arrangements

Info

Publication number
GB636575A
GB636575A GB2877/48A GB287748A GB636575A GB 636575 A GB636575 A GB 636575A GB 2877/48 A GB2877/48 A GB 2877/48A GB 287748 A GB287748 A GB 287748A GB 636575 A GB636575 A GB 636575A
Authority
GB
United Kingdom
Prior art keywords
automatic frequency
relating
circuit arrangements
synchronising circuit
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
GB2877/48A
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
Priority to GB2877/48A priority Critical patent/GB636575A/en
Priority to CH274636D priority patent/CH274636A/en
Priority to NL144510A priority patent/NL76047C/xx
Priority to DEP32625D priority patent/DE826171C/en
Publication of GB636575A publication Critical patent/GB636575A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

636,575. Automatic frequency control systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and MORTLEY, W. S. Jan. 30, 1948, No. 2877. [Class 38 (iv)] The synchronization of oscillators O1, 02 is effected by means of the phase detector PD which adjusts the reactance valve RV controlling 02. The filter comprising the opposed rectifier R1, R2 and condenser C is inserted between PD and RV to reduce the phase modulation of 02 by unwanted signals from PD. R1 and R2 act as a non-linear resistor and change the time constant of the filter as the degree of synchronization changes.
GB2877/48A 1948-01-30 1948-01-30 Improvements in or relating to automatic frequency synchronising circuit arrangements Expired GB636575A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2877/48A GB636575A (en) 1948-01-30 1948-01-30 Improvements in or relating to automatic frequency synchronising circuit arrangements
CH274636D CH274636A (en) 1948-01-30 1948-11-05 Device for frequency synchronization.
NL144510A NL76047C (en) 1948-01-30 1949-01-25
DEP32625D DE826171C (en) 1948-01-30 1949-01-28 Automatic frequency synchronization arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2877/48A GB636575A (en) 1948-01-30 1948-01-30 Improvements in or relating to automatic frequency synchronising circuit arrangements

Publications (1)

Publication Number Publication Date
GB636575A true GB636575A (en) 1950-05-03

Family

ID=26240421

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2877/48A Expired GB636575A (en) 1948-01-30 1948-01-30 Improvements in or relating to automatic frequency synchronising circuit arrangements

Country Status (4)

Country Link
CH (1) CH274636A (en)
DE (1) DE826171C (en)
GB (1) GB636575A (en)
NL (1) NL76047C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2175580A1 (en) * 1972-03-14 1973-10-26 Thomson Csf
EP0243941A2 (en) * 1986-05-02 1987-11-04 Honeywell Regelsysteme GmbH Method for the determination of the distance to an object, and circuit therefor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1168480B (en) * 1952-12-31 1964-04-23 Gasaccumulator Svenska Ab Synchronizing device, especially for television receivers
DE1114532B (en) * 1957-10-15 1961-10-05 Telefunken Patent Circuit arrangement for synchronizing a vibration generator
US3316497A (en) * 1965-07-09 1967-04-25 Robert R Brooks Phase controlled oscillator loop with variable passband filter
DE1762025B1 (en) * 1968-03-23 1970-06-18 Fernseh Gmbh Circuit arrangement with an extended synchronization range for synchronizing an oscillator with an alternating voltage
DE2709270C2 (en) * 1977-03-03 1984-02-23 Siemens AG, 1000 Berlin und 8000 München TV set with a control loop for the frequency and phase position of the vertical pulses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2175580A1 (en) * 1972-03-14 1973-10-26 Thomson Csf
EP0243941A2 (en) * 1986-05-02 1987-11-04 Honeywell Regelsysteme GmbH Method for the determination of the distance to an object, and circuit therefor
EP0243941A3 (en) * 1986-05-02 1989-03-15 Honeywell Regelsysteme GmbH Method for the determination of the distance to an object, and circuit therefor

Also Published As

Publication number Publication date
NL76047C (en) 1954-05-15
CH274636A (en) 1951-04-15
DE826171C (en) 1951-12-27

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