JPS5775009A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS5775009A
JPS5775009A JP15188780A JP15188780A JPS5775009A JP S5775009 A JPS5775009 A JP S5775009A JP 15188780 A JP15188780 A JP 15188780A JP 15188780 A JP15188780 A JP 15188780A JP S5775009 A JPS5775009 A JP S5775009A
Authority
JP
Japan
Prior art keywords
signals
modulation
phases
carrier signal
orthogonal
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
JP15188780A
Other languages
Japanese (ja)
Inventor
Bunichi Miyamoto
Takahiro Yokota
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 JP15188780A priority Critical patent/JPS5775009A/en
Publication of JPS5775009A publication Critical patent/JPS5775009A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To modulate a carrier signal even if this carrier signal has been already modulated, by obtaining four-phase signals orthogonal to one another from the carrier signal to be modulated and synthesizing respective signals after AM-modulating them by modulation signals of orthogonal phases. CONSTITUTION:A carrier signal to be modulated has the phase shifted by a 90 deg. hybrid circuit, and obained output signals are inputted to 180 deg. hybrid circuits respectively to obtain signals of phases orthogonal to one another. Four signals obtained in this mannr are synthesized after AM modulation to obtain an FM modulation wave. That is, an output (f) of a voltage control oscillator VCO which oscillates in accordance with a modulation signal im is made into two signals having phases shifted from each other by 90 deg., and respective signals have frequencies divided by flip-flops and have phases detected by a signal (f') of the accurate f/2, thus obtaining AM modulation signals X1, X2, Y1, and Y2. Consequently, since an AFC loop is digitized, athe operation is accurate, and the circuit is simplified, and thus, the circuit is made into an IC easily.
JP15188780A 1980-10-29 1980-10-29 Frequency modulator Pending JPS5775009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15188780A JPS5775009A (en) 1980-10-29 1980-10-29 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15188780A JPS5775009A (en) 1980-10-29 1980-10-29 Frequency modulator

Publications (1)

Publication Number Publication Date
JPS5775009A true JPS5775009A (en) 1982-05-11

Family

ID=15528369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15188780A Pending JPS5775009A (en) 1980-10-29 1980-10-29 Frequency modulator

Country Status (1)

Country Link
JP (1) JPS5775009A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109945901A (en) * 2019-03-11 2019-06-28 南京智慧基础设施技术研究院有限公司 A kind of device and method suitable for Fibre Optical Sensor signal resolution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109945901A (en) * 2019-03-11 2019-06-28 南京智慧基础设施技术研究院有限公司 A kind of device and method suitable for Fibre Optical Sensor signal resolution
CN109945901B (en) * 2019-03-11 2023-11-24 南京智慧基础设施技术研究院有限公司 Equipment and method suitable for analyzing optical fiber sensing signals

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