GB745908A - Improvements in or relating to apparatus for phase modulating electric oscillations - Google Patents
Improvements in or relating to apparatus for phase modulating electric oscillationsInfo
- Publication number
- GB745908A GB745908A GB2812552A GB2812552A GB745908A GB 745908 A GB745908 A GB 745908A GB 2812552 A GB2812552 A GB 2812552A GB 2812552 A GB2812552 A GB 2812552A GB 745908 A GB745908 A GB 745908A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- carrier
- output
- amplitude
- adding means
- 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
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
- H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
Abstract
745,908. Phase modulation. GENERAL ELECTRIC CO., Ltd. Nov. 9. 1953 [Nov. 7, 1952], No. 28125/52. Class 40 (5). Phase modulation is obtained by vectorially adding in adding means 1 a carrier input and a phase displaced carrier obtained from the output of the adding means through a 90 degrees phaseshifting network 5 and a balanced amplitude modulator 6 whose output is therefore a carrier with amplitude proportional to the modulating voltage. The output and added carrier being in phase quadrature, the phase deviation of the output is therefore sin<SP>-1</SP> x, where x is the ratio of modulation voltage to carrier input amplitude. The phase-modulated output, amplified and restored in a limiter 8 to the same amplitude of the carrier input, then further has vectorially added to it in adding means 3 a quadrature phase carrier from the balanced modulator attenuated to <SP>3</SP>#2 times the carrier input amplitude. The final phase deviation is therefore #=sin<SP>-1</SP> <SP>3</SP>#2.x+tan<SP>-1</SP> x and it is shown that # is linearly related to x except only for fifth and higher powers of it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2812552A GB745908A (en) | 1952-11-07 | 1952-11-07 | Improvements in or relating to apparatus for phase modulating electric oscillations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2812552A GB745908A (en) | 1952-11-07 | 1952-11-07 | Improvements in or relating to apparatus for phase modulating electric oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB745908A true GB745908A (en) | 1956-03-07 |
Family
ID=10270661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2812552A Expired GB745908A (en) | 1952-11-07 | 1952-11-07 | Improvements in or relating to apparatus for phase modulating electric oscillations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB745908A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2920289A (en) * | 1956-09-11 | 1960-01-05 | Lab For Electronics Inc | Signal modulating apparatus |
| US3013209A (en) * | 1958-06-09 | 1961-12-12 | Henry J Bickel | Coherent memory filter |
-
1952
- 1952-11-07 GB GB2812552A patent/GB745908A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2920289A (en) * | 1956-09-11 | 1960-01-05 | Lab For Electronics Inc | Signal modulating apparatus |
| US3013209A (en) * | 1958-06-09 | 1961-12-12 | Henry J Bickel | Coherent memory filter |
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