JPS5613814A - Automatic frequency control device - Google Patents

Automatic frequency control device

Info

Publication number
JPS5613814A
JPS5613814A JP8816279A JP8816279A JPS5613814A JP S5613814 A JPS5613814 A JP S5613814A JP 8816279 A JP8816279 A JP 8816279A JP 8816279 A JP8816279 A JP 8816279A JP S5613814 A JPS5613814 A JP S5613814A
Authority
JP
Japan
Prior art keywords
signal
pulse
counter
supplied
output
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.)
Granted
Application number
JP8816279A
Other languages
Japanese (ja)
Other versions
JPH0337325B2 (en
Inventor
Junichi Ishida
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.)
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting 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 Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP8816279A priority Critical patent/JPS5613814A/en
Publication of JPS5613814A publication Critical patent/JPS5613814A/en
Publication of JPH0337325B2 publication Critical patent/JPH0337325B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control

Abstract

PURPOSE:To ensure the steady and high-accuracy control for the carrier frequency of the FM signal, by forming the control signal with the pulse signal having the same pulse duration as the prescribed value of the carrier frequency. CONSTITUTION:Gate pulse (b) is produced 1 from synchronous input signal (a) and then supplied to counter 2. And the frequency of the carrier wave of the modulated wave input signal is counted by counter 2, and the output (c) is supplied to decoder 3. Thus output pulse (d) of decoder 3 turns into the pulse train with the pulse duration modulated in correspondence to the momentarily changing carrier frequency of the modulated wave input signal. Then the reference frequency is gated successively by pulse train (d), and the reference frequency during the gating period is counted by counter 4. And the output (e) is supplied successively to register 5. Then analog signal (f) having the signal level corresponding to the successive pulse duration of train (d) through D/A converting circuit 6. This signal (f) is used for the control signal to ensure the steady and high-accuracy control.
JP8816279A 1979-07-13 1979-07-13 Automatic frequency control device Granted JPS5613814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8816279A JPS5613814A (en) 1979-07-13 1979-07-13 Automatic frequency control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8816279A JPS5613814A (en) 1979-07-13 1979-07-13 Automatic frequency control device

Publications (2)

Publication Number Publication Date
JPS5613814A true JPS5613814A (en) 1981-02-10
JPH0337325B2 JPH0337325B2 (en) 1991-06-05

Family

ID=13935223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8816279A Granted JPS5613814A (en) 1979-07-13 1979-07-13 Automatic frequency control device

Country Status (1)

Country Link
JP (1) JPS5613814A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4979151A (en) * 1972-12-01 1974-07-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4979151A (en) * 1972-12-01 1974-07-31

Also Published As

Publication number Publication date
JPH0337325B2 (en) 1991-06-05

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