JPS5650622A - Afc search circuit - Google Patents

Afc search circuit

Info

Publication number
JPS5650622A
JPS5650622A JP12598579A JP12598579A JPS5650622A JP S5650622 A JPS5650622 A JP S5650622A JP 12598579 A JP12598579 A JP 12598579A JP 12598579 A JP12598579 A JP 12598579A JP S5650622 A JPS5650622 A JP S5650622A
Authority
JP
Japan
Prior art keywords
circuit
power supply
afc
time
preset
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
JP12598579A
Other languages
Japanese (ja)
Other versions
JPS625373B2 (en
Inventor
Morio Kumagai
Makoto Inukai
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.)
TRIO KENWOOD CORP
Kenwood KK
Original Assignee
TRIO KENWOOD CORP
Kenwood KK
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 TRIO KENWOOD CORP, Kenwood KK filed Critical TRIO KENWOOD CORP
Priority to JP12598579A priority Critical patent/JPS5650622A/en
Publication of JPS5650622A publication Critical patent/JPS5650622A/en
Publication of JPS625373B2 publication Critical patent/JPS625373B2/ja
Granted 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
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/22—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element in which an automatic frequency control circuit is brought into action after the scanning action has been stopped

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To secure a quick stability for the circuit, by using such AFC circuit that ensures an assured reception during the power supply on and although a drift may occur to the local transmission operation excepting during the time when the power supply is turned on or preset. CONSTITUTION:The delay 10 is given to the voltage rise time for a fixed time when the power supply switch is turned on or preset, and then waveform shaping 12 is given after the differentiation 11. The output of the wave shaping is led to the bias circuit 13 via the capacitor 14 and then supplied to the integral network 16 after the waveform shaping 15 to secure a slow change of the voltage. Then the output of this circuit 16 is supplied to the AFC circuit in the form of the search signal, and thus the AFC lead-in action is carried out within one cycle of the search signal. As a result, the reception is secured during the power supply on even though the local oscillation frequency may have some drift, and at the same time no effect is given to the operations of other circuits excepting the time when the power supply is on or preset. Such AFC circuit can assure a quick stability for the circuit.
JP12598579A 1979-09-29 1979-09-29 Afc search circuit Granted JPS5650622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12598579A JPS5650622A (en) 1979-09-29 1979-09-29 Afc search circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12598579A JPS5650622A (en) 1979-09-29 1979-09-29 Afc search circuit

Publications (2)

Publication Number Publication Date
JPS5650622A true JPS5650622A (en) 1981-05-07
JPS625373B2 JPS625373B2 (en) 1987-02-04

Family

ID=14923868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12598579A Granted JPS5650622A (en) 1979-09-29 1979-09-29 Afc search circuit

Country Status (1)

Country Link
JP (1) JPS5650622A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272614A (en) * 1986-05-20 1987-11-26 Fujitsu Ltd Automatic optical heterodyne receiver for selecting frequency

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272614A (en) * 1986-05-20 1987-11-26 Fujitsu Ltd Automatic optical heterodyne receiver for selecting frequency

Also Published As

Publication number Publication date
JPS625373B2 (en) 1987-02-04

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