JPS57104305A - Carrier extracting system - Google Patents
Carrier extracting systemInfo
- Publication number
- JPS57104305A JPS57104305A JP17979180A JP17979180A JPS57104305A JP S57104305 A JPS57104305 A JP S57104305A JP 17979180 A JP17979180 A JP 17979180A JP 17979180 A JP17979180 A JP 17979180A JP S57104305 A JPS57104305 A JP S57104305A
- Authority
- JP
- Japan
- Prior art keywords
- input signal
- angular frequency
- circuit
- derivative
- carrier
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/006—Demodulation of angle-, frequency- or phase- modulated oscillations by sampling the oscillations and further processing the samples, e.g. by computing techniques
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To separate a carrier angular frequency of the angle modulation wave accompanied with amplitude fluctuation, by obtaining the angular frequency of an input signal on a basis of the square root of a ratio of the input signal to a derivative of the second order of the input signal. CONSTITUTION:A derivative of the second order of an input signal applied to a terminal 11 is operated by an operating circuit 20, and a ratio of this derivative of the second order to the input signal is obtained by a divider 40. Since this ratio gives the square of the angular frequency of the input signal, an average value in a constant section is obtained by an average operating circuit 21, and the square root is operated by a square root operating circuit 41, thereby obtaining the angular frequency of carrier components. Further, the input signal is delayed in a delay circuit 30 by a time required for operations from the circuit 20 to the circuit 14 and is subjected to Fourier conversion due to the carrier angular frequency by a Fourier converting circuit 22 to separate carrier components of the input signal as a parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17979180A JPS57104305A (en) | 1980-12-19 | 1980-12-19 | Carrier extracting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17979180A JPS57104305A (en) | 1980-12-19 | 1980-12-19 | Carrier extracting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57104305A true JPS57104305A (en) | 1982-06-29 |
Family
ID=16071949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17979180A Pending JPS57104305A (en) | 1980-12-19 | 1980-12-19 | Carrier extracting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57104305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8631667B2 (en) | 2006-09-18 | 2014-01-21 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Adsorption heat pump with heat accumulator |
-
1980
- 1980-12-19 JP JP17979180A patent/JPS57104305A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8631667B2 (en) | 2006-09-18 | 2014-01-21 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Adsorption heat pump with heat accumulator |
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