JPS5710523A - Automatic sweep digital tuning circuit - Google Patents

Automatic sweep digital tuning circuit

Info

Publication number
JPS5710523A
JPS5710523A JP8700080A JP8700080A JPS5710523A JP S5710523 A JPS5710523 A JP S5710523A JP 8700080 A JP8700080 A JP 8700080A JP 8700080 A JP8700080 A JP 8700080A JP S5710523 A JPS5710523 A JP S5710523A
Authority
JP
Japan
Prior art keywords
tuning
sweep
counter
frequency
automatic
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
JP8700080A
Other languages
Japanese (ja)
Other versions
JPS6329850B2 (en
Inventor
Hideji Takebe
Hiroshi Kobayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8700080A priority Critical patent/JPS5710523A/en
Publication of JPS5710523A publication Critical patent/JPS5710523A/en
Publication of JPS6329850B2 publication Critical patent/JPS6329850B2/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
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To draw in the sweep to the most suited tuning point, by retarding the sweep a little and correcting the overshoot, after the stop of automatic sweep. CONSTITUTION:An up-pulse is transmitted from an automatic sweep control circuit 2 to an up-down-counter 3 at a switch means 1, the counter 3 makes up-count, the digital output is applied to a varactor diode of a tuner 5 via a D/A converter 4 and the tuning frequency of the tuner 5 is swept to high frequency side. When the tuning frequency comes to the most suited tuning point, the sweep is stopped and the digital output of the counter 3 is shifted to higher frequency due to the delay in time of the D/A conversion and the response of an AFC voltage from the optimum tuning point. The correction is made by transmitting the down-pulse from a down-pulse application means 7 to the counter 3. Thus, the tuning frequency can be drawn into the optimum tuning point with an automatic frequency fine tuning circuit 5 to be succeedingly operated.
JP8700080A 1980-06-23 1980-06-23 Automatic sweep digital tuning circuit Granted JPS5710523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8700080A JPS5710523A (en) 1980-06-23 1980-06-23 Automatic sweep digital tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8700080A JPS5710523A (en) 1980-06-23 1980-06-23 Automatic sweep digital tuning circuit

Publications (2)

Publication Number Publication Date
JPS5710523A true JPS5710523A (en) 1982-01-20
JPS6329850B2 JPS6329850B2 (en) 1988-06-15

Family

ID=13902598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8700080A Granted JPS5710523A (en) 1980-06-23 1980-06-23 Automatic sweep digital tuning circuit

Country Status (1)

Country Link
JP (1) JPS5710523A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61280114A (en) * 1985-06-04 1986-12-10 Mitsubishi Electric Corp Automatic sweep digital tuning circuit
US5348397A (en) * 1993-03-29 1994-09-20 Ferrari R Keith Medical temperature sensing probe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0683506U (en) * 1993-05-17 1994-11-29 住友エール株式会社 Battery safety lock mechanism for electric forklift

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5459816A (en) * 1977-10-21 1979-05-14 Hitachi Ltd Tuning voltage sweep circuit
JPS54123806A (en) * 1978-03-17 1979-09-26 Sanyo Electric Co Ltd Digital preset tuner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5459816A (en) * 1977-10-21 1979-05-14 Hitachi Ltd Tuning voltage sweep circuit
JPS54123806A (en) * 1978-03-17 1979-09-26 Sanyo Electric Co Ltd Digital preset tuner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61280114A (en) * 1985-06-04 1986-12-10 Mitsubishi Electric Corp Automatic sweep digital tuning circuit
US5348397A (en) * 1993-03-29 1994-09-20 Ferrari R Keith Medical temperature sensing probe

Also Published As

Publication number Publication date
JPS6329850B2 (en) 1988-06-15

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