JPS6484948A - Demodulation system for frequency modulation signal - Google Patents
Demodulation system for frequency modulation signalInfo
- Publication number
- JPS6484948A JPS6484948A JP24212887A JP24212887A JPS6484948A JP S6484948 A JPS6484948 A JP S6484948A JP 24212887 A JP24212887 A JP 24212887A JP 24212887 A JP24212887 A JP 24212887A JP S6484948 A JPS6484948 A JP S6484948A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- frequency
- oscillating signal
- local oscillating
- fsk
- 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
- 238000005265 energy consumption Methods 0.000 abstract 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To miniaturize a circuit scale and, simultaneously, to reduce an energy consumption by generating the pseudo-PSK of a +90 deg./-90 deg. to the FSK carrier of an input '1'/'0'. CONSTITUTION:A limiter circuit 3 outputs the frequency of the difference between the frequencies of an input signal and a local oscillating signal. When an FSK signal is inputted, since a local frequency is obtained to the mean value of a '1'/'0' frequency, the output frequency is not influenced by the phase of the local oscillating signal. On the other hand, as for the phase, by the 0 deg./90 deg. phase change of the local oscillating signal, the phase is changed by +90 deg./-90 deg. corresponding to the frequency of a '0'/'1' carrier input. Thus, by investigating phase relations before and after a time when the phase of the local oscillating signal is changed by 0 deg./90 deg. by means of an EX-OR4, the demodulation of the FSK can be executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24212887A JPS6484948A (en) | 1987-09-25 | 1987-09-25 | Demodulation system for frequency modulation signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24212887A JPS6484948A (en) | 1987-09-25 | 1987-09-25 | Demodulation system for frequency modulation signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6484948A true JPS6484948A (en) | 1989-03-30 |
Family
ID=17084720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24212887A Pending JPS6484948A (en) | 1987-09-25 | 1987-09-25 | Demodulation system for frequency modulation signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6484948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5293408A (en) * | 1991-10-14 | 1994-03-08 | Matsushita Electric Industrial Co., Ltd. | FSK data receiving system |
| JP2012050078A (en) * | 2010-08-18 | 2012-03-08 | Swatch Group Research & Development Ltd | Low-speed direct-conversion fsk radio frequency signal receiver |
-
1987
- 1987-09-25 JP JP24212887A patent/JPS6484948A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5293408A (en) * | 1991-10-14 | 1994-03-08 | Matsushita Electric Industrial Co., Ltd. | FSK data receiving system |
| JP2012050078A (en) * | 2010-08-18 | 2012-03-08 | Swatch Group Research & Development Ltd | Low-speed direct-conversion fsk radio frequency signal receiver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2048148A1 (en) | Transmitter | |
| ES8506952A1 (en) | Controlled oscillator circuit. | |
| JPS6484948A (en) | Demodulation system for frequency modulation signal | |
| EP0026639A3 (en) | Clock recovery network | |
| JPS5614727A (en) | Phase comparator of digital pll circuit | |
| JPS5725755A (en) | Waveform superposed fsk modulator | |
| JPS5293258A (en) | Phase syncronizing oscillator | |
| ES8306299A1 (en) | Frequency converter and phase locked loop circuit | |
| JPS5635559A (en) | Phase modulating device | |
| SU1319237A1 (en) | Generator | |
| SE7706449L (en) | TRANSMITTER RECEIVER, SPECIAL FOR RADIOELECTRIC DISTANCE SATURATION | |
| SU703914A1 (en) | Binary signal regenerator | |
| JPS55149506A (en) | Frequency modulator | |
| JPS5792902A (en) | Fm modulator | |
| JPS57180256A (en) | Fsk modulator | |
| JPS57135555A (en) | Phase continuous fsk modulating circuit | |
| JPS5585161A (en) | Msk modulation unit | |
| JPS5523613A (en) | Reproducing system of timing information | |
| JPS57136810A (en) | Frequency modulating system using pll | |
| JPS56149827A (en) | 90 phase difference signal generating circuit | |
| JPS55162605A (en) | Fm modulation unit | |
| JPS57152238A (en) | Synchronous detection type receiving circuit | |
| JPS6441365A (en) | Digital signal generator | |
| JPS54109879A (en) | Electronic watch | |
| JPS55118219A (en) | Tuning unit |