JPS54139367A - Digital carrier wave extraction circuit - Google Patents
Digital carrier wave extraction circuitInfo
- Publication number
- JPS54139367A JPS54139367A JP4725778A JP4725778A JPS54139367A JP S54139367 A JPS54139367 A JP S54139367A JP 4725778 A JP4725778 A JP 4725778A JP 4725778 A JP4725778 A JP 4725778A JP S54139367 A JPS54139367 A JP S54139367A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- waveform
- slicer
- extraction circuit
- noise
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
- H04L27/2276—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals using frequency multiplication or harmonic tracking
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To operate stably an extraction circuit even if the ratio of carrier power to noise power is small, by providing a delay circuit in a part of the carrier extraction circuit of digital n-phase modulation receiving waves. CONSTITUTION:In the normal digital carrier extraction circuit consisting of n- multiplier circuit 402, resonator 403, slicer 404, 1/n frequency divider circuit 406 consisting of digital circuits, etc., pulse insertion circuit 406 consisting of differentiating circuit 502, delay circuit 503 and OR integrated circuit 504 is provided between slicer 404 and 1/n frequency divider circuit 406. For example, in case that one bit pulse is omitted in output waveform a of slicer 404 due to noise, waveform b differentiated by circuit 502 is inputted to circuit 504, and simultaneously, waveform b becomes waveform C delayed by one period (T time) in delay circuit 503 and is inputted to cirucit 504. Then, these waveforms are synthesized to become waveform d, and influences of noise are eliminated, and waveform d appears at terminal 505.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4725778A JPS54139367A (en) | 1978-04-20 | 1978-04-20 | Digital carrier wave extraction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4725778A JPS54139367A (en) | 1978-04-20 | 1978-04-20 | Digital carrier wave extraction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54139367A true JPS54139367A (en) | 1979-10-29 |
Family
ID=12770217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4725778A Pending JPS54139367A (en) | 1978-04-20 | 1978-04-20 | Digital carrier wave extraction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54139367A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004094940A1 (en) * | 2003-04-23 | 2004-11-04 | Nikon Corporation | Interferometer system, signal processing method in interferometer system, stage using the signal processing method |
-
1978
- 1978-04-20 JP JP4725778A patent/JPS54139367A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004094940A1 (en) * | 2003-04-23 | 2004-11-04 | Nikon Corporation | Interferometer system, signal processing method in interferometer system, stage using the signal processing method |
| JPWO2004094940A1 (en) * | 2003-04-23 | 2006-07-13 | 株式会社ニコン | Interferometer system, signal processing method in interferometer system, and stage using the signal processing method |
| US7382468B2 (en) | 2003-04-23 | 2008-06-03 | Nikon Corporation | Interferometer system, signal processing method in interferometer system, and stage using signal processing |
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