JPS5664516A - Afc circuit - Google Patents

Afc circuit

Info

Publication number
JPS5664516A
JPS5664516A JP14096179A JP14096179A JPS5664516A JP S5664516 A JPS5664516 A JP S5664516A JP 14096179 A JP14096179 A JP 14096179A JP 14096179 A JP14096179 A JP 14096179A JP S5664516 A JPS5664516 A JP S5664516A
Authority
JP
Japan
Prior art keywords
circuit
output
action
tuning
afc
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
JP14096179A
Other languages
Japanese (ja)
Inventor
Setsuo Yano
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 JP14096179A priority Critical patent/JPS5664516A/en
Publication of JPS5664516A publication Critical patent/JPS5664516A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To eliminate the switch operation with every tuning action and thus simplify the operation for an FM radio receiver or the like, by securing an automatic on/off control for the AFC action in accordance with the intensity of the received signal. CONSTITUTION:No output is delivered from the intermediate frequency amplifying circuit in case when a receiver is under the detuning state. Accordingly, the output of the control circuit 8 is approximate to zero. In this case, the reference voltage applied to the input terminal (a) of one side in the switching circuit 7 emerges at the output terminal (d). This voltage is then applied to the variable capacity diode 6 forming the local oscillating circuit 3. Then the tuning action is started to get close to the tuning point, and thus the circuit 7 is switched. As a result, the AFC signal applied to the input terminal (b) is applied to the diode 6.
JP14096179A 1979-10-30 1979-10-30 Afc circuit Pending JPS5664516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14096179A JPS5664516A (en) 1979-10-30 1979-10-30 Afc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14096179A JPS5664516A (en) 1979-10-30 1979-10-30 Afc circuit

Publications (1)

Publication Number Publication Date
JPS5664516A true JPS5664516A (en) 1981-06-01

Family

ID=15280835

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14096179A Pending JPS5664516A (en) 1979-10-30 1979-10-30 Afc circuit

Country Status (1)

Country Link
JP (1) JPS5664516A (en)

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