JPS55162605A - Fm modulation unit - Google Patents

Fm modulation unit

Info

Publication number
JPS55162605A
JPS55162605A JP7150979A JP7150979A JPS55162605A JP S55162605 A JPS55162605 A JP S55162605A JP 7150979 A JP7150979 A JP 7150979A JP 7150979 A JP7150979 A JP 7150979A JP S55162605 A JPS55162605 A JP S55162605A
Authority
JP
Japan
Prior art keywords
output
phase
voltage controlled
shift
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
JP7150979A
Other languages
Japanese (ja)
Inventor
Hiroshi Saito
Koichi Kido
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7150979A priority Critical patent/JPS55162605A/en
Publication of JPS55162605A publication Critical patent/JPS55162605A/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

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To obtain the frequency modulation signal having greater frequency shift and synchronizing with the reference signal lower in the frequency comparatively, by detecting the phase shift of output between the voltage controlled oscillator and the reference signal oscillator in the frequency modulator to avoid the phase shift. CONSTITUTION:Without modulation signal at the input terminal 1, the sample hole circuit 6 is shortened to form the phase locked loop by a phase comparator 4, low band filter 5, and voltage controlled oscillator 7, to keep the phase difference of output between the voltage controlled oscillator 7 and the reference signal oscillator 3 at 90 deg.. When a modulation signal is input, the zero cross signal generator 8 stores a voltage proportional to the shift of output phase difference between the voltage controlled oscillator 7 and the reference signal oscillator 3 from 90 deg. to a sample hold circuit 6, and the phase of output of the voltage controlled oscillator 7 is changed with the output to avoid the shift in the phase difference of output of the both oscillators 3 and 7.
JP7150979A 1979-06-06 1979-06-06 Fm modulation unit Pending JPS55162605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7150979A JPS55162605A (en) 1979-06-06 1979-06-06 Fm modulation unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7150979A JPS55162605A (en) 1979-06-06 1979-06-06 Fm modulation unit

Publications (1)

Publication Number Publication Date
JPS55162605A true JPS55162605A (en) 1980-12-18

Family

ID=13462729

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7150979A Pending JPS55162605A (en) 1979-06-06 1979-06-06 Fm modulation unit

Country Status (1)

Country Link
JP (1) JPS55162605A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04371046A (en) * 1991-06-20 1992-12-24 Sharp Corp Fm modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04371046A (en) * 1991-06-20 1992-12-24 Sharp Corp Fm modulator

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