JPS5635561A - Carrier regenerating device - Google Patents
Carrier regenerating deviceInfo
- Publication number
- JPS5635561A JPS5635561A JP11110879A JP11110879A JPS5635561A JP S5635561 A JPS5635561 A JP S5635561A JP 11110879 A JP11110879 A JP 11110879A JP 11110879 A JP11110879 A JP 11110879A JP S5635561 A JPS5635561 A JP S5635561A
- Authority
- JP
- Japan
- Prior art keywords
- oscillation frequency
- output
- circuit
- phase
- oscillator
- 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
- 230000001172 regenerating effect Effects 0.000 title 1
- 230000010355 oscillation Effects 0.000 abstract 3
- 239000000969 carrier Substances 0.000 abstract 2
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
- H04L27/2277—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals using remodulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/14—Preventing false-lock or pseudo-lock of the PLL
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 secure an escape for the loop out of the false lock state, by giving a forced increase to the oscillation frequency of the voltage control oscillator in case no specific phase relation is secured between the input carrier signal and the regenerated carrier signal. CONSTITUTION:The deciding circuit 30 gives a decision to the phase relation between the PSK (digital phase modulation) wave produced by modulating the input carrier via the data and the output of the modulator 15 obtained by modulating the regenerated carrier with the demodulated data. Then the output of the phase fre- quency comparator 21 is applied to the voltage control oscillator 13 via the LPF12 and in the form of the control signal. And thus the oscillation frequency is conrolled to secure a constant phase difference between the both carriers. In case no coincid- ence is obtained between the both carriers, the control circuit 40 gives a forced increase to the oscillation frequency of the oscillator 13 based on the output of the circuit 30. As a result, an escape is secured for the loop out of the false lock state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54111108A JPS6057780B2 (en) | 1979-08-31 | 1979-08-31 | carrier wave regenerator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54111108A JPS6057780B2 (en) | 1979-08-31 | 1979-08-31 | carrier wave regenerator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5635561A true JPS5635561A (en) | 1981-04-08 |
JPS6057780B2 JPS6057780B2 (en) | 1985-12-17 |
Family
ID=14552597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54111108A Expired JPS6057780B2 (en) | 1979-08-31 | 1979-08-31 | carrier wave regenerator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6057780B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60130246A (en) * | 1983-12-19 | 1985-07-11 | Matsushita Electric Ind Co Ltd | Carrier recovery device |
JPS62139448A (en) * | 1985-12-13 | 1987-06-23 | Fujitsu Ltd | Carrier recovery circuit |
EP0735692A2 (en) * | 1995-03-31 | 1996-10-02 | Alcatel N.V. | Data clock recovery circuit |
-
1979
- 1979-08-31 JP JP54111108A patent/JPS6057780B2/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60130246A (en) * | 1983-12-19 | 1985-07-11 | Matsushita Electric Ind Co Ltd | Carrier recovery device |
JPS62139448A (en) * | 1985-12-13 | 1987-06-23 | Fujitsu Ltd | Carrier recovery circuit |
EP0735692A2 (en) * | 1995-03-31 | 1996-10-02 | Alcatel N.V. | Data clock recovery circuit |
EP0735692A3 (en) * | 1995-03-31 | 1997-01-29 | Alcatel Nv | Data clock recovery circuit |
US5670913A (en) * | 1995-03-31 | 1997-09-23 | Alcatel N.V. | Phase locked loop circuit with false locking detector and a lock acquisition sweep |
AU713906B2 (en) * | 1995-03-31 | 1999-12-16 | Alcatel N.V. | Data clock recovery circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS6057780B2 (en) | 1985-12-17 |
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