JPS5680949A - Pseudo-leading-in evading circuit of reference carrier reproducing circuit - Google Patents

Pseudo-leading-in evading circuit of reference carrier reproducing circuit

Info

Publication number
JPS5680949A
JPS5680949A JP15741879A JP15741879A JPS5680949A JP S5680949 A JPS5680949 A JP S5680949A JP 15741879 A JP15741879 A JP 15741879A JP 15741879 A JP15741879 A JP 15741879A JP S5680949 A JPS5680949 A JP S5680949A
Authority
JP
Japan
Prior art keywords
loop
signal
frequency
leading
circuit
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
JP15741879A
Other languages
Japanese (ja)
Other versions
JPS5816827B2 (en
Inventor
Kiyoaki Takahashi
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 JP54157418A priority Critical patent/JPS5816827B2/en
Publication of JPS5680949A publication Critical patent/JPS5680949A/en
Publication of JPS5816827B2 publication Critical patent/JPS5816827B2/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
    • H04L27/2271—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
    • 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

Abstract

PURPOSE:To make it possible to evade a pseudo-leading-in state securely by providing a method of obtaining a frequency error signal, which corresponds to the difference between the carrier frequency of a phase-shift modulated signal and the output frequency of a voltage control oscillator, independently of a phase synchronous loop. CONSTITUTION:As a carrier reproduction loop almost enters into a psuedo-leading- in state, output (i) of low-pass filter 26 begins to increase. Monitoring circuit 27 monitors the magnitude of signal (i) and, when it reaches the 1st threshold value VS1, controls switch 28 to lead signal (i) to loop filter 17. At this point in time, a reference carrier reproducing circuit is changed from the operation of the phase synchronous loop up to the point over to that of a mean-value automatic frequency control loop and then controlled so that the frequency of VCO14 will near the carrier frequency of an input PSK wave by using as a control voltage signal (i) having passed through loop filter 17. When signal (i) reaches the 2nd threshold value VS2, it is reset to the original phase synchronous loop operation again.
JP54157418A 1979-12-06 1979-12-06 Pseudo pull-in avoidance circuit in reference carrier regeneration circuit Expired JPS5816827B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54157418A JPS5816827B2 (en) 1979-12-06 1979-12-06 Pseudo pull-in avoidance circuit in reference carrier regeneration circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54157418A JPS5816827B2 (en) 1979-12-06 1979-12-06 Pseudo pull-in avoidance circuit in reference carrier regeneration circuit

Publications (2)

Publication Number Publication Date
JPS5680949A true JPS5680949A (en) 1981-07-02
JPS5816827B2 JPS5816827B2 (en) 1983-04-02

Family

ID=15649193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54157418A Expired JPS5816827B2 (en) 1979-12-06 1979-12-06 Pseudo pull-in avoidance circuit in reference carrier regeneration circuit

Country Status (1)

Country Link
JP (1) JPS5816827B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60151028U (en) * 1984-03-19 1985-10-07 望月　朝右ヱ門 Heating and cooling equipment using geothermal energy
JP6806643B2 (en) 2017-07-24 2021-01-06 本田技研工業株式会社 Steering wheel unit

Also Published As

Publication number Publication date
JPS5816827B2 (en) 1983-04-02

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