GB621793A - Improvements in apparatus for controlling the frequency of an oscillator - Google Patents
Improvements in apparatus for controlling the frequency of an oscillatorInfo
- Publication number
- GB621793A GB621793A GB8936/46A GB893646A GB621793A GB 621793 A GB621793 A GB 621793A GB 8936/46 A GB8936/46 A GB 8936/46A GB 893646 A GB893646 A GB 893646A GB 621793 A GB621793 A GB 621793A
- Authority
- GB
- United Kingdom
- Prior art keywords
- push
- oscillation
- march
- diodes
- vary
- 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
- 230000010355 oscillation Effects 0.000 abstract 4
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
621,793. Phase-difference measurements. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 22, 1946, No. 8936. Convention date, March 22, 1945. [Class 37] [Also in Groups XXXV and XL (b)] The phase difference between synchronizing pulses a and a sinusoidal oscillation developed at 51 is measured by applying the pulses a to the diodes 44, 45 in push-push, and the sinusoidal oscillation in push-pull ; in the time relationship of pulse and oscillation shown in Fig. 2, the outputs of the diodes are equal and opposite, but should this time-relationhsip vary, e.g. as in Fig. 3, one diode has a greater output than the other. The diode outputs are differentially combined to produce a signal whose sign and magnitude is dependent on whether the pulse leads or lags the oscillation and the extent of such lead or lag. This signal controls a reactance valve to vary the frequency of the oscillator 51 which controls a sawtooth generator 91-101.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US621793XA | 1945-03-22 | 1945-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621793A true GB621793A (en) | 1949-04-20 |
Family
ID=22040714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8936/46A Expired GB621793A (en) | 1945-03-22 | 1946-03-22 | Improvements in apparatus for controlling the frequency of an oscillator |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR924259A (en) |
| GB (1) | GB621793A (en) |
-
1946
- 1946-03-20 FR FR924259D patent/FR924259A/en not_active Expired
- 1946-03-22 GB GB8936/46A patent/GB621793A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR924259A (en) | 1947-07-31 |
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