JPS55149506A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS55149506A
JPS55149506A JP5681279A JP5681279A JPS55149506A JP S55149506 A JPS55149506 A JP S55149506A JP 5681279 A JP5681279 A JP 5681279A JP 5681279 A JP5681279 A JP 5681279A JP S55149506 A JPS55149506 A JP S55149506A
Authority
JP
Japan
Prior art keywords
frequency
input
center frequency
variation
controlled oscillator
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
JP5681279A
Other languages
Japanese (ja)
Inventor
Yoshihiko Akaiwa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP5681279A priority Critical patent/JPS55149506A/en
Publication of JPS55149506A publication Critical patent/JPS55149506A/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

Abstract

PURPOSE:To decrease the variation of the center frequency, by synthesizing the output frequency-discriminating the modulation wave of the voltage controlled oscillator with the modulation input signal. CONSTITUTION:The input signal S(t) is input to the voltage controlled oscillator VCO27 to obtain the modulation wave Vo(t), which is fed to the frequency discriminator DET28 to pick up the output difference Vd(t) with the center frequency. On the other hand, S(t) is multiplied by r and delayed by tau, to obtain the signal S'(t). The variation of the center frequency is suppressed by feeding back the error Vd'(t) which is obtained by subtracting S'(t) from Vd(t) to the input of VCO.
JP5681279A 1979-05-09 1979-05-09 Frequency modulator Pending JPS55149506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5681279A JPS55149506A (en) 1979-05-09 1979-05-09 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5681279A JPS55149506A (en) 1979-05-09 1979-05-09 Frequency modulator

Publications (1)

Publication Number Publication Date
JPS55149506A true JPS55149506A (en) 1980-11-20

Family

ID=13037781

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5681279A Pending JPS55149506A (en) 1979-05-09 1979-05-09 Frequency modulator

Country Status (1)

Country Link
JP (1) JPS55149506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009121325A (en) * 2007-11-14 2009-06-04 Honda Motor Co Ltd Lubricating structure for internal combustion engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5132163A (en) * 1974-09-12 1976-03-18 Matsushita Electric Ind Co Ltd KAKUDOHENCHOHOSHIKI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5132163A (en) * 1974-09-12 1976-03-18 Matsushita Electric Ind Co Ltd KAKUDOHENCHOHOSHIKI

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009121325A (en) * 2007-11-14 2009-06-04 Honda Motor Co Ltd Lubricating structure for internal combustion engine

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