JPS54114914A - Radio unit for use with phase synchronizing circuit - Google Patents

Radio unit for use with phase synchronizing circuit

Info

Publication number
JPS54114914A
JPS54114914A JP2234778A JP2234778A JPS54114914A JP S54114914 A JPS54114914 A JP S54114914A JP 2234778 A JP2234778 A JP 2234778A JP 2234778 A JP2234778 A JP 2234778A JP S54114914 A JPS54114914 A JP S54114914A
Authority
JP
Japan
Prior art keywords
reception signal
circuit
synchronism
phase
switch
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
JP2234778A
Other languages
Japanese (ja)
Inventor
Takuro Oguchi
Hajime Masuda
Masaji Honma
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 JP2234778A priority Critical patent/JPS54114914A/en
Publication of JPS54114914A publication Critical patent/JPS54114914A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To enable to perform phase synchronization to the reception signal quickly, by reducing the effect due to the interference waves when the reception signal is weak, through disabling the phase synchronizing circuit for the synchronism if the reception signal is less than the predetermined level. CONSTITUTION:In the radio unit picking up the demodulation output from the reception signal by the phase synchronism circuit, the reception signal which is less than the predetermined level is detected for example, with the directional coupler SDC, filter NBP, rectifying circuit DD, and hysteresis circuit HYS. The output of the hysteresis circuit HYS closes the switch BSW, the voltage of the bias power supply BS is fed to the voltage controlled oscillator VCO of the phase locked loop PLL, disabling synchronism. Further, when the level of the reception signal is more than the given level, the switch BSW is opened and normal operation is again initiated in a very short time. Moreover, the switch SW is opened simultaneously with the switch BSW closed, it is recuired to stop transmission.
JP2234778A 1978-02-28 1978-02-28 Radio unit for use with phase synchronizing circuit Pending JPS54114914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2234778A JPS54114914A (en) 1978-02-28 1978-02-28 Radio unit for use with phase synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2234778A JPS54114914A (en) 1978-02-28 1978-02-28 Radio unit for use with phase synchronizing circuit

Publications (1)

Publication Number Publication Date
JPS54114914A true JPS54114914A (en) 1979-09-07

Family

ID=12080130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2234778A Pending JPS54114914A (en) 1978-02-28 1978-02-28 Radio unit for use with phase synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS54114914A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517531A (en) * 1981-01-09 1985-05-14 Fuji Xerox Co., Ltd. Carrier wave reproducing circuit in synchronized detection system of medium speed facsimile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517531A (en) * 1981-01-09 1985-05-14 Fuji Xerox Co., Ltd. Carrier wave reproducing circuit in synchronized detection system of medium speed facsimile

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