JPS5599886A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS5599886A
JPS5599886A JP737879A JP737879A JPS5599886A JP S5599886 A JPS5599886 A JP S5599886A JP 737879 A JP737879 A JP 737879A JP 737879 A JP737879 A JP 737879A JP S5599886 A JPS5599886 A JP S5599886A
Authority
JP
Japan
Prior art keywords
circuit
frequency
oscillator
signal
constitution
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
JP737879A
Other languages
Japanese (ja)
Inventor
Takamichi Mihashi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP737879A priority Critical patent/JPS5599886A/en
Publication of JPS5599886A publication Critical patent/JPS5599886A/en
Pending legal-status Critical Current

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  • Television Receiver Circuits (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE: To perform stable frequency modulation with a simple circuit constitution, by forming the AFC loop which always holds the ratio between mutually different two frequencies at a constant ratio.
CONSTITUTION: The first circuit 18 obtaining the output voltage V1 when the frequency of input signal is 3.5 fH, and the second circuit 20 obtaining the same output voltage V1 when 2fH are provided. The output signals of the circuits 18 and 20 are compared at the comparator 21, and the output signal is fed to the mixing circuit 23 via LPF 22, where the modulation signal is added, and the frequency of the variable frequency oscillator 19 is controlled with the added signal. With this constitution, the variation in the time axis is removed with PLL 13 and the AFC loop of oscillator 19-circuit 20-comparator 21-LPF22-circuit 23-oscillator 19 is formed. Further, this AFC loop is controlled that the frequency of the oscillator 19 is 2 fH with the signal from the circuit 18.
COPYRIGHT: (C)1980,JPO&Japio
JP737879A 1979-01-24 1979-01-24 Frequency modulator Pending JPS5599886A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP737879A JPS5599886A (en) 1979-01-24 1979-01-24 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP737879A JPS5599886A (en) 1979-01-24 1979-01-24 Frequency modulator

Publications (1)

Publication Number Publication Date
JPS5599886A true JPS5599886A (en) 1980-07-30

Family

ID=11664285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP737879A Pending JPS5599886A (en) 1979-01-24 1979-01-24 Frequency modulator

Country Status (1)

Country Link
JP (1) JPS5599886A (en)

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