JPS5635561A - Carrier regenerating device - Google Patents

Carrier regenerating device

Info

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
Application number
JP11110879A
Other languages
Japanese (ja)
Other versions
JPS6057780B2 (en
Inventor
Tsukasa Okai
Fumio Sugiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP54111108A priority Critical patent/JPS6057780B2/en
Publication of JPS5635561A publication Critical patent/JPS5635561A/en
Publication of JPS6057780B2 publication Critical patent/JPS6057780B2/en
Expired legal-status Critical Current

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
    • H04L27/2277—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.
JP54111108A 1979-08-31 1979-08-31 carrier wave regenerator Expired JPS6057780B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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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