GB899935A - Improvements in or relating to circuit arrangements for synchronizing a local oscillator - Google Patents

Improvements in or relating to circuit arrangements for synchronizing a local oscillator

Info

Publication number
GB899935A
GB899935A GB487/60A GB48760A GB899935A GB 899935 A GB899935 A GB 899935A GB 487/60 A GB487/60 A GB 487/60A GB 48760 A GB48760 A GB 48760A GB 899935 A GB899935 A GB 899935A
Authority
GB
United Kingdom
Prior art keywords
oscillator
phase detector
pulses
phase
synchronizing
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
GB487/60A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB899935A publication Critical patent/GB899935A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/005—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which one of the oscillations is, or is converted into, a signal having a special waveform, e.g. triangular
    • 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
    • H03L7/101—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop
    • 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

Landscapes

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

Abstract

899,935. Automatic phase control systems. PHILIPS ELECTRICAL INDUSTRIES Ltd. Jan 6, 1960 [Jan. 9, 1959], No. 487/60. Class 40(5). In an arrangement for synchronizing an oscillator 3, Fig. 5, with a synchronizing signal 1, comprising a phase detector 2 to which the signal 1 and a sawtooth waveform 4 derived from the oscillator are applied, and which is effective over a limited range of phase difference to control through a filter 5 a reactance valve 6, an additional catching circuit including a gate 9 for gating the synchronizing signal directly to the oscillator is controlled by a separate phase detector 7 to open the gate when the phase error exceeds the catching range of the first phase detector, and to close it in conjunction with a reduced output from phase detector 2 when the phase error is brought back within the catching range. The pulses 10 from the oscillator to the second phase detector are chosen to be of great duration with respect to pulses 1. Synchronization of pulses 1 and 10 causes valve 24 to draw current and cut off gate 9. In the out of synchronizm position pulses 1 are amplified and fed via capacitor 27 for direct synchronization to the screen grid of oscillator 29.
GB487/60A 1959-01-09 1960-01-06 Improvements in or relating to circuit arrangements for synchronizing a local oscillator Expired GB899935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL235002 1959-01-09

Publications (1)

Publication Number Publication Date
GB899935A true GB899935A (en) 1962-06-27

Family

ID=19751507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB487/60A Expired GB899935A (en) 1959-01-09 1960-01-06 Improvements in or relating to circuit arrangements for synchronizing a local oscillator

Country Status (5)

Country Link
DE (1) DE1146526B (en)
ES (1) ES254785A1 (en)
FR (1) FR1244757A (en)
GB (1) GB899935A (en)
NL (2) NL113527C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260958A (en) * 1962-06-25 1966-07-12 Hitachi Ltd Frequency sweep circuit for phase controlled oscillator
US3460052A (en) * 1967-08-02 1969-08-05 Information Dev Corp Oscillator phase and frequency synchronizing circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279591A (en) * 1959-12-24
US3155773A (en) * 1960-03-09 1964-11-03 Nat Res Dev System for synchronously detecting signals in the presence of noise

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965500C (en) * 1952-05-24 1957-06-13 Fernseh Gmbh Method for synchronizing a vibration generator
DE1804349U (en) * 1959-09-03 1960-01-21 Standard Elektrik Lorenz Ag LINE CATCH ARRANGEMENT FOR TELEVISION RECEIVERS.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260958A (en) * 1962-06-25 1966-07-12 Hitachi Ltd Frequency sweep circuit for phase controlled oscillator
US3460052A (en) * 1967-08-02 1969-08-05 Information Dev Corp Oscillator phase and frequency synchronizing circuit

Also Published As

Publication number Publication date
DE1146526B (en) 1963-04-04
NL113527C (en)
FR1244757A (en) 1960-10-28
NL235002A (en)
ES254785A1 (en) 1960-03-01

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