JPS5750125A - Automatic sweeping digital tuning circuit - Google Patents

Automatic sweeping digital tuning circuit

Info

Publication number
JPS5750125A
JPS5750125A JP12561280A JP12561280A JPS5750125A JP S5750125 A JPS5750125 A JP S5750125A JP 12561280 A JP12561280 A JP 12561280A JP 12561280 A JP12561280 A JP 12561280A JP S5750125 A JPS5750125 A JP S5750125A
Authority
JP
Japan
Prior art keywords
circuit
automatic
sweep
tuning frequency
counter
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
JP12561280A
Other languages
Japanese (ja)
Other versions
JPS6329852B2 (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 JP12561280A priority Critical patent/JPS5750125A/en
Priority to US06/299,502 priority patent/US4380825A/en
Publication of JPS5750125A publication Critical patent/JPS5750125A/en
Publication of JPS6329852B2 publication Critical patent/JPS6329852B2/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
    • H03J7/24—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes
    • H03J7/26—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes in which an automatic frequency control circuit is brought into action after the scanning action has been stopped
    • 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 catch broadcasting electromagnetic waves surely, even with time delay for D/A conversion without lowering the speed of automatic sweep by helping the operation of an AFC circuit, through shifting the tuning frequency to a low frequency side compulsively. CONSTITUTION:A signal starting automatic sweep from a switching means 1 is received at an automatic sweep controlling circuit 2 and a pulse signal is applied from the circuit 2 to an up-down counter 3. After a digital output counted at the counter 3 is converted into a DC voltage at a D/A converter 4, it is applied to a varactor diode of an electronic tuner to sweep the tuning frequency of the tuner 5 to high frequencies. An automatic frequency fine adjusting circuit 6 is operated, and when the tuning frequency is shifted to high frequencies to the digital output of the counter 3, a count-down means 7 is actuated. The tuning frequency is compulsively shifted to lower frequencies by helping the operation of the circuit 6, allowing to catch broadcasting electromagnetic waves without suppressing the speed of automatic sweep.
JP12561280A 1980-09-09 1980-09-09 Automatic sweeping digital tuning circuit Granted JPS5750125A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12561280A JPS5750125A (en) 1980-09-09 1980-09-09 Automatic sweeping digital tuning circuit
US06/299,502 US4380825A (en) 1980-09-09 1981-09-04 Automatic sweep digital tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12561280A JPS5750125A (en) 1980-09-09 1980-09-09 Automatic sweeping digital tuning circuit

Publications (2)

Publication Number Publication Date
JPS5750125A true JPS5750125A (en) 1982-03-24
JPS6329852B2 JPS6329852B2 (en) 1988-06-15

Family

ID=14914396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12561280A Granted JPS5750125A (en) 1980-09-09 1980-09-09 Automatic sweeping digital tuning circuit

Country Status (1)

Country Link
JP (1) JPS5750125A (en)

Also Published As

Publication number Publication date
JPS6329852B2 (en) 1988-06-15

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