GB700056A - Improvements in or relating to circuits for automatic control of the frequency of anoscillator - Google Patents
Improvements in or relating to circuits for automatic control of the frequency of anoscillatorInfo
- Publication number
- GB700056A GB700056A GB311652A GB311652A GB700056A GB 700056 A GB700056 A GB 700056A GB 311652 A GB311652 A GB 311652A GB 311652 A GB311652 A GB 311652A GB 700056 A GB700056 A GB 700056A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- tubes
- frequency
- oscillator
- resistor
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
-
- 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)
- Television Receiver Circuits (AREA)
Abstract
700,056. Automatic frequency control systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 6, 1952 [Feb. 9, 1951 ], No. 3116/52. Class 38 (4). [Also in Group XXXVI] The frequency of an oscillator 1 is automatically controlled by applying sawtooth voltages 5 derived from the oscillator to the anodes of two discharge tubes 8, 11 and by applying pulsatory positive voltages 2 (which may be part of a television wave form 3) to a control grid 14 of one of the tubes. The resulting positive voltage pulses across the resistor 17 at the cathode of the tube 11 are transferred through a condenser 18 to the cathode of the tube 8, so that the gridcathode voltages are in opposed sense in the two tubes. The D.C. anode circuits for the two tubes are completed by anode resistors 19, 20 and cathode resistors 13, 21 and 17, 22. If the sawtooth voltage is not in desired phase relation with the pulsatory voltage, the current rises in one valve and falls in the other, giving rise to a difference voltage across the resistors 21, 22 which is applied through a resistor 25 to adjust the frequency of the oscillator 1. The tube 11 is a screen-grid tube, and self-biases its control grid, owing to the action of the condenser 15 and resistor 16, to such an extent that the picture signal 3 is clipped.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL159177 | 1951-02-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB700056A true GB700056A (en) | 1953-11-25 |
Family
ID=19750514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB311652A Expired GB700056A (en) | 1951-02-09 | 1952-02-06 | Improvements in or relating to circuits for automatic control of the frequency of anoscillator |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE509056A (en) |
| CH (1) | CH299130A (en) |
| FR (1) | FR1050618A (en) |
| GB (1) | GB700056A (en) |
| NL (1) | NL74006C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL97726C (en) * | 1956-12-15 |
-
0
- BE BE509056D patent/BE509056A/xx unknown
- NL NL74006D patent/NL74006C/xx active
-
1952
- 1952-02-06 GB GB311652A patent/GB700056A/en not_active Expired
- 1952-02-07 CH CH299130D patent/CH299130A/en unknown
- 1952-02-07 FR FR1050618D patent/FR1050618A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL74006C (en) | |
| FR1050618A (en) | 1954-01-08 |
| BE509056A (en) | |
| CH299130A (en) | 1954-05-31 |
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