JPS5637726A - Automatic channel selector - Google Patents

Automatic channel selector

Info

Publication number
JPS5637726A
JPS5637726A JP11376479A JP11376479A JPS5637726A JP S5637726 A JPS5637726 A JP S5637726A JP 11376479 A JP11376479 A JP 11376479A JP 11376479 A JP11376479 A JP 11376479A JP S5637726 A JPS5637726 A JP S5637726A
Authority
JP
Japan
Prior art keywords
motor
tuning
circuit
point
intermediate frequency
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
JP11376479A
Other languages
Japanese (ja)
Other versions
JPS5927532B2 (en
Inventor
Yuichi Naito
Itaru Hatano
Shohei Ono
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.)
Alps Alpine Co Ltd
Original Assignee
Alps 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP11376479A priority Critical patent/JPS5927532B2/en
Publication of JPS5637726A publication Critical patent/JPS5637726A/en
Publication of JPS5927532B2 publication Critical patent/JPS5927532B2/en
Expired 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
    • H03J7/30—Automatic scanning over a band of frequencies where the scanning is accomplished by mechanical means, e.g. by a motor
    • H03J7/305—Automatic scanning over a band of frequencies where the scanning is accomplished by mechanical means, e.g. by a motor in which an automatic frequency control circuit is brought in action after the scanning action has been stopped

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To secure an easy control of the stepping motor and thus ensure an accurate tuning, by reducing the rotation speed of the motor which drives the variable capacitor by making use of the intermediate frequency and then securing a perfect tuning by means of the S-curve. CONSTITUTION:With push of the searching direction change-over switch SU in the control circuit 61, the stepping motor 41 is rotated along with the coupled variable capacitors 12a and 14a to approximate to the tuning point of one desired station. In this case, the output of the intermediate frequency amplifier 15 produces the slow- down signal SLD before reaching the tuning point, and thus the motor 41 is retarded in such degree that it can proceed to the stopping action without any overrun. After this, the capacitors 12a and 14a turn to reach the tuning point, and this is detected by the 2nd comparator 32 the threshold level of which is set at the middle point of the S-curve given from the wave detector 16. Then the stop signal STP is produced from the logic circuit 33. And based on this signal STP, the motor stop signal MST is supplied to the motor driving circuit 42 from the circuit 61. Accordingly, the motor 41 is held at the angle of rotation then, thus completing the operation of an automatic channel selection.
JP11376479A 1979-09-05 1979-09-05 automatic channel selection device Expired JPS5927532B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11376479A JPS5927532B2 (en) 1979-09-05 1979-09-05 automatic channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11376479A JPS5927532B2 (en) 1979-09-05 1979-09-05 automatic channel selection device

Publications (2)

Publication Number Publication Date
JPS5637726A true JPS5637726A (en) 1981-04-11
JPS5927532B2 JPS5927532B2 (en) 1984-07-06

Family

ID=14620541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11376479A Expired JPS5927532B2 (en) 1979-09-05 1979-09-05 automatic channel selection device

Country Status (1)

Country Link
JP (1) JPS5927532B2 (en)

Also Published As

Publication number Publication date
JPS5927532B2 (en) 1984-07-06

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