JPS5748850A - Carrier reproducing circuit - Google Patents

Carrier reproducing circuit

Info

Publication number
JPS5748850A
JPS5748850A JP55123427A JP12342780A JPS5748850A JP S5748850 A JPS5748850 A JP S5748850A JP 55123427 A JP55123427 A JP 55123427A JP 12342780 A JP12342780 A JP 12342780A JP S5748850 A JPS5748850 A JP S5748850A
Authority
JP
Japan
Prior art keywords
frequency
circuit
phase locked
loop circuit
locked loop
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
JP55123427A
Other languages
Japanese (ja)
Inventor
Masanori Honda
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 JP55123427A priority Critical patent/JPS5748850A/en
Publication of JPS5748850A publication Critical patent/JPS5748850A/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
    • H04L27/2272—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals using phase locked loops

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 manufacturing cost, by applying the frequency of a local oscillator of a newly provided phase locked loop circuit to a main phase locked loop circuit, in a carrier reproducing circuit for a demodulation circuit of a digital signal receiver. CONSTITUTION:The 2nd phase loop circuit consisting of an amplifier 21, a low- frequency filter 22, a voltage-controlled quartz oscillator 23, and a mixer 24, is added, and the frequency of the voltage-controlled quartz oscillator 23 is given to a main phase locked loop circuit including a voltage controlled quartz oscillator 5' as a local oscillation frequency. Thus, the frequency in the loop including a base band processing circuit 2 gradually approaches an average frequency of an input singal S, and the main phase locked loop circuit can stably be drawn into the carrier frequency.
JP55123427A 1980-09-08 1980-09-08 Carrier reproducing circuit Pending JPS5748850A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55123427A JPS5748850A (en) 1980-09-08 1980-09-08 Carrier reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55123427A JPS5748850A (en) 1980-09-08 1980-09-08 Carrier reproducing circuit

Publications (1)

Publication Number Publication Date
JPS5748850A true JPS5748850A (en) 1982-03-20

Family

ID=14860287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55123427A Pending JPS5748850A (en) 1980-09-08 1980-09-08 Carrier reproducing circuit

Country Status (1)

Country Link
JP (1) JPS5748850A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6441128U (en) * 1987-09-07 1989-03-13

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6441128U (en) * 1987-09-07 1989-03-13
JPH0627944Y2 (en) * 1987-09-07 1994-07-27 古河電気工業株式会社 Vapor phase growth equipment

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