JPS5687967A - Carrier wave reproduction circuit - Google Patents

Carrier wave reproduction circuit

Info

Publication number
JPS5687967A
JPS5687967A JP16467279A JP16467279A JPS5687967A JP S5687967 A JPS5687967 A JP S5687967A JP 16467279 A JP16467279 A JP 16467279A JP 16467279 A JP16467279 A JP 16467279A JP S5687967 A JPS5687967 A JP S5687967A
Authority
JP
Japan
Prior art keywords
output
vco6
voltage
frequency
synchronism
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
Application number
JP16467279A
Other languages
Japanese (ja)
Inventor
Kazuo Ogawa
Eiji Suzuki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16467279A priority Critical patent/JPS5687967A/en
Publication of JPS5687967A publication Critical patent/JPS5687967A/en
Pending 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
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop

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 reduce the time required for synchronism, by discriminating the simulated pull-in phenomena whether it is produced at the upper or not at the lower side of the reception carrier frequency and synchronizing the oscillation frequency of the voltage controlled oscillator. CONSTITUTION:The received input is given to a signal processing circuit 4 after the phase comparison of the output of a voltage controlled oscillator VCO6 and the output in phase shift of it by pi/2. On the other hand, the output of the VCO6 is compared with the output of a reference oscillator 8 at the frequency phase comparator FPC7, and different two outputs, when the frequency of VCO6 is lower or higher, are given to the 1st and 2nd voltage identifiers 9, 10. The devices 9 and 10 compare them with the set output at an output identifying point set circuit 11 to identify to what side of upper or lower side the virtual drawing is made, to drive a sweeper 13 and to output the synchronizing voltage of VCO6 from a voltage shift circuit 14. Thus, the time required for synchronism is reduced.
JP16467279A 1979-12-20 1979-12-20 Carrier wave reproduction circuit Pending JPS5687967A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16467279A JPS5687967A (en) 1979-12-20 1979-12-20 Carrier wave reproduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16467279A JPS5687967A (en) 1979-12-20 1979-12-20 Carrier wave reproduction circuit

Publications (1)

Publication Number Publication Date
JPS5687967A true JPS5687967A (en) 1981-07-17

Family

ID=15797632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16467279A Pending JPS5687967A (en) 1979-12-20 1979-12-20 Carrier wave reproduction circuit

Country Status (1)

Country Link
JP (1) JPS5687967A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072241A2 (en) * 1981-08-10 1983-02-16 Fujitsu Limited Carrier recovery circuit
JPH02116246A (en) * 1988-10-26 1990-04-27 Nec Corp Input frequency fluctuation detecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072241A2 (en) * 1981-08-10 1983-02-16 Fujitsu Limited Carrier recovery circuit
JPH02116246A (en) * 1988-10-26 1990-04-27 Nec Corp Input frequency fluctuation detecting circuit

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