JPS57135519A - Tuning circuit - Google Patents

Tuning circuit

Info

Publication number
JPS57135519A
JPS57135519A JP2193381A JP2193381A JPS57135519A JP S57135519 A JPS57135519 A JP S57135519A JP 2193381 A JP2193381 A JP 2193381A JP 2193381 A JP2193381 A JP 2193381A JP S57135519 A JPS57135519 A JP S57135519A
Authority
JP
Japan
Prior art keywords
tuning
filter
voltage
circuit
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.)
Pending
Application number
JP2193381A
Other languages
Japanese (ja)
Inventor
Yukihiro Hayashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2193381A priority Critical patent/JPS57135519A/en
Publication of JPS57135519A publication Critical patent/JPS57135519A/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
    • H03J7/18—Automatic scanning over a band of frequencies

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To achieve locking at the best tuning point even when tuning characteristics have variations, by storing a maximum detected value by detecting the output of a voltage tuning type filter and thus permitting the voltage tuning type filter to tune to the best tuning point. CONSTITUTION:When receiving center frequency data D1, a sawtooth wave generating circuit 3 generates a sawtooth wave centering on its tuning frequenty and applies the wave to a filter driver 2. On the basis of this sawtooth wave, the driver 2 applies a tuning voltage to a voltage tuning type filter 1, and the center frequency of the tuning frequency of the filter 1 is made to fluctuate, thus obtaining an output signal SO. This signal SO is detected by a detecting circuit 4, whose detection output is sent to a peak detecting and storing circuit 5. The circuit 5 stores the output level and tuning voltage of the filter 1 successively and detects the maximum output point of the signal SO to apply the tuning voltage to the filter driver 2. Consequently, the filter 1 is tuned to and locked at the maximum point of the signal SO. When the tuning characteristics vary owing to disturbance, the output of the circuit 5 is supplied to the circuit 3 and the filter driver 2 is driven to achieve tuning.
JP2193381A 1981-02-17 1981-02-17 Tuning circuit Pending JPS57135519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2193381A JPS57135519A (en) 1981-02-17 1981-02-17 Tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2193381A JPS57135519A (en) 1981-02-17 1981-02-17 Tuning circuit

Publications (1)

Publication Number Publication Date
JPS57135519A true JPS57135519A (en) 1982-08-21

Family

ID=12068845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2193381A Pending JPS57135519A (en) 1981-02-17 1981-02-17 Tuning circuit

Country Status (1)

Country Link
JP (1) JPS57135519A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04148719A (en) * 1990-10-11 1992-05-21 Central Conveyor Kk Drive device for classification conveyer
JPH04148720A (en) * 1990-10-11 1992-05-21 Central Conveyor Kk Carriage of classification conveyer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04148719A (en) * 1990-10-11 1992-05-21 Central Conveyor Kk Drive device for classification conveyer
JPH04148720A (en) * 1990-10-11 1992-05-21 Central Conveyor Kk Carriage of classification conveyer

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