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 systemsInfo
- 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
Links
- 239000002131 composite material Substances 0.000 abstract 2
- 230000010355 oscillation Effects 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
- 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.
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)
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 |
-
1938
- 1938-10-26 US US237052A patent/US2201978A/en not_active Expired - Lifetime
-
1939
- 1939-10-26 GB GB28780/39A patent/GB534749A/en not_active Expired
-
1947
- 1947-07-31 FR FR989233D patent/FR989233A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR989233A (en) | 1951-09-06 |
US2201978A (en) | 1940-05-28 |
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