JPS55149554A - Carrier reproducing circuit - Google Patents
Carrier reproducing circuitInfo
- Publication number
- JPS55149554A JPS55149554A JP5724279A JP5724279A JPS55149554A JP S55149554 A JPS55149554 A JP S55149554A JP 5724279 A JP5724279 A JP 5724279A JP 5724279 A JP5724279 A JP 5724279A JP S55149554 A JPS55149554 A JP S55149554A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- signal
- fed
- input
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/0062—Detection of the synchronisation error by features other than the received signal transition detection of error based on data decision error, e.g. Mueller type detection
-
- 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
- H04L27/2277—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals using remodulation
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 obtain the carrier reproducing circuit having the functions which can detect asynchronism of the carrier reproducing PLL and that of clock synchronous circuit, by adding one detection circuit. CONSTITUTION:The digital phase modulation wave input to the input terminal 1 is in phase comparison with the reproduced carrier fed from PLL5 at the demodulator 6, and the output is in A/D conversion and output from the terminals 2, 2' as the digital demodulation signal. The output of the A/D converter 62 is fed to the clock synchronous circuit 7 and the clock in synchronizing with the demodulation data is obtained as the output of VCO75. This clock signal is adjusted of the phase by the phase shifter 8 and then formed of the pulse width at the circuit 9 and fed to PLL5. The A/D conversion output of the demodulator 6 is input to the inverse modulator 4, and the input signal is in inverse modulation with the data signal. The output of the inverse-modulator 4 is fed to PLL5 as the carrier of nonmodulation. The input signal of VCO54 in the PLL circuit 5 is branched and detected at the detection circuit 10, then output as the signal representing asynchronized state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5724279A JPS55149554A (en) | 1979-05-10 | 1979-05-10 | Carrier reproducing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5724279A JPS55149554A (en) | 1979-05-10 | 1979-05-10 | Carrier reproducing circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55149554A true JPS55149554A (en) | 1980-11-20 |
JPS6154303B2 JPS6154303B2 (en) | 1986-11-21 |
Family
ID=13050057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5724279A Granted JPS55149554A (en) | 1979-05-10 | 1979-05-10 | Carrier reproducing circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55149554A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4507617A (en) * | 1981-08-10 | 1985-03-26 | Fujitsu Limited | Carrier recovery circuit for a PSK modulated signal |
US4525676A (en) * | 1981-02-24 | 1985-06-25 | Nippon Electric Co., Ltd. | PSK Demodulation system having carrier frequency variation compensation |
-
1979
- 1979-05-10 JP JP5724279A patent/JPS55149554A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525676A (en) * | 1981-02-24 | 1985-06-25 | Nippon Electric Co., Ltd. | PSK Demodulation system having carrier frequency variation compensation |
US4507617A (en) * | 1981-08-10 | 1985-03-26 | Fujitsu Limited | Carrier recovery circuit for a PSK modulated signal |
Also Published As
Publication number | Publication date |
---|---|
JPS6154303B2 (en) | 1986-11-21 |
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