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 oscillatorInfo
- 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
Links
- 239000003990 capacitor Substances 0.000 abstract 1
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.
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) | NL235002A (en) |
Cited By (2)
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)
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)
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. |
-
0
- NL NL113527D patent/NL113527C/xx active
- NL NL235002D patent/NL235002A/xx unknown
-
1960
- 1960-01-05 ES ES0254785A patent/ES254785A1/en not_active Expired
- 1960-01-05 DE DEN17725A patent/DE1146526B/en active Pending
- 1960-01-06 GB GB487/60A patent/GB899935A/en not_active Expired
- 1960-01-07 FR FR815107A patent/FR1244757A/en not_active Expired
Cited By (2)
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 |
---|---|
ES254785A1 (en) | 1960-03-01 |
DE1146526B (en) | 1963-04-04 |
FR1244757A (en) | 1960-10-28 |
NL235002A (en) | |
NL113527C (en) |
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