GB553828A - Improvements in frequency or phase modulation - Google Patents
Improvements in frequency or phase modulationInfo
- Publication number
- GB553828A GB553828A GB6970/41A GB697041A GB553828A GB 553828 A GB553828 A GB 553828A GB 6970/41 A GB6970/41 A GB 6970/41A GB 697041 A GB697041 A GB 697041A GB 553828 A GB553828 A GB 553828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wave
- circuit
- modulating
- saw
- phase
- 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
- 239000013078 crystal Substances 0.000 abstract 1
- 230000010356 wave oscillation Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
553,828. Phase or frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 30, 1941, No. 6970. Convention date, June 1, 1940. [Class 40 (v)] A circuit for phase or frequency modulation comprises a sine wave oscillation generator 1 stabilized by a crystal or other means, a multivibrator 3 converting the sine wave to saw-tooth form which is applied to a class B amplifier 9 together with modulating voltages from source 17 to provide pulses of varying duration which are applied to a resonant circuit 11 followed, if desired, by a frequency multiplying and amplitude limiting circuit 13. In the absence of modulating voltage, only the tips of the saw-toothed wave are applied to amplifier 9 resulting in a sinve wave EO, Fig. 2, in the output of the resonant circuit, but modulating voltages V1- V3 bring the saw-toothed wave into operation at different points on the slope resulting in output waves E1-E3. The circuit shown produces phase modulation, but if frequency modulation is required the modulating wave is modified in a resistance-capacity circuit as described in Specification 548,370.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US553828XA | 1940-06-01 | 1940-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB553828A true GB553828A (en) | 1943-06-08 |
Family
ID=21997429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6970/41A Expired GB553828A (en) | 1940-06-01 | 1941-05-30 | Improvements in frequency or phase modulation |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB553828A (en) |
-
1941
- 1941-05-30 GB GB6970/41A patent/GB553828A/en not_active Expired
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