JPS5610714A - Frequency modulating device - Google Patents

Frequency modulating device

Info

Publication number
JPS5610714A
JPS5610714A JP8616979A JP8616979A JPS5610714A JP S5610714 A JPS5610714 A JP S5610714A JP 8616979 A JP8616979 A JP 8616979A JP 8616979 A JP8616979 A JP 8616979A JP S5610714 A JPS5610714 A JP S5610714A
Authority
JP
Japan
Prior art keywords
frequency
oscillator
circuit
switch circuit
signal exists
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
JP8616979A
Other languages
Japanese (ja)
Inventor
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 JP8616979A priority Critical patent/JPS5610714A/en
Publication of JPS5610714A publication Critical patent/JPS5610714A/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)

Abstract

PURPOSE:To always secure the synchronization with a comparatively low frequency of the reference oscillator, by holding the control signal when no audio signal exists and then controlling the oscillation frequency when the audio signal exists respectively. CONSTITUTION:In case no signal exists at audio input terminal 9, switch circuit 2 is turned on along with switch circuit 6 connected to the 6b side. The phase synchronous loop is formed by phase comparator 3, LPF4 switch circuit 6 and voltage control oscillator 7. And the oscillation frequency synchronized with the frequency of reference signal generator 1 is delivered from oscillator 7. At this moment, sample holding circuit 5 holds the output of LPF4. Then in case when the signal exists at terminal 9, switch circuit 2 is turned off with circuit 6 connected to the 6a side. And oscillator 7 is controlled by the holding voltage of circuit 5 and then has the oscillation with the same frequency as when the loop is formed. Thus the frequency modulated signal with the above-mentioned frequency defined as the carrier can be obtained. In this way, the oscillation frequency can always be synchronized with oscillator 1.
JP8616979A 1979-07-06 1979-07-06 Frequency modulating device Pending JPS5610714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8616979A JPS5610714A (en) 1979-07-06 1979-07-06 Frequency modulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8616979A JPS5610714A (en) 1979-07-06 1979-07-06 Frequency modulating device

Publications (1)

Publication Number Publication Date
JPS5610714A true JPS5610714A (en) 1981-02-03

Family

ID=13879245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8616979A Pending JPS5610714A (en) 1979-07-06 1979-07-06 Frequency modulating device

Country Status (1)

Country Link
JP (1) JPS5610714A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011032739A (en) * 2009-08-03 2011-02-17 Sanwa Senzai Kk Spacer for reinforcing bar arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011032739A (en) * 2009-08-03 2011-02-17 Sanwa Senzai Kk Spacer for reinforcing bar arrangement

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