JPS54157419A - Channel selecting device containing automatic station searching function - Google Patents

Channel selecting device containing automatic station searching function

Info

Publication number
JPS54157419A
JPS54157419A JP6739578A JP6739578A JPS54157419A JP S54157419 A JPS54157419 A JP S54157419A JP 6739578 A JP6739578 A JP 6739578A JP 6739578 A JP6739578 A JP 6739578A JP S54157419 A JPS54157419 A JP S54157419A
Authority
JP
Japan
Prior art keywords
station searching
searching
adjacent
device containing
selecting device
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
JP6739578A
Other languages
Japanese (ja)
Other versions
JPS589607B2 (en
Inventor
Yoshiyasu Yamanaka
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP6739578A priority Critical patent/JPS589607B2/en
Publication of JPS54157419A publication Critical patent/JPS54157419A/en
Publication of JPS589607B2 publication Critical patent/JPS589607B2/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
    • H03J7/20—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
    • H03J7/285—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 the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To prevent the stopping of the searching action at the idle channel caused by the effect of the adjacent channels in the strong field for the channel selecting device containing the automatic station searching function of the TV picture receiver or the like. CONSTITUTION:Comparators 24a and 24b plus 25a and 25b are connected to control input 26 and 27 of control unit 12 which controls the station searching action with supply of the division signal to PLL synthesizer 1. Then the output of VIF carrier detection circuit 9, synchronous signal detection circuit and IFAGC voltage production circuit 28 are supplied to comparator 24a, 24b and 25b, and 25a respectively. While the reference voltage is supplied to the other input according to the sensitivity setting position. In case the adjacent broadcast channels feature the strong field, the effect is given to the adjacent idle channels. But the station searching action does not stop since IF signal R and synchronous signal RL are secured when the sensitivity detting is under beta. And the AGC voltage becomes higher than RA at point (a) when the setting is right to beta, and thus the searching does not stop either owing to the output of comparators 25a and 25b.
JP6739578A 1978-06-01 1978-06-01 Tuning device with automatic station searching function Expired JPS589607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6739578A JPS589607B2 (en) 1978-06-01 1978-06-01 Tuning device with automatic station searching function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6739578A JPS589607B2 (en) 1978-06-01 1978-06-01 Tuning device with automatic station searching function

Publications (2)

Publication Number Publication Date
JPS54157419A true JPS54157419A (en) 1979-12-12
JPS589607B2 JPS589607B2 (en) 1983-02-22

Family

ID=13343731

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6739578A Expired JPS589607B2 (en) 1978-06-01 1978-06-01 Tuning device with automatic station searching function

Country Status (1)

Country Link
JP (1) JPS589607B2 (en)

Also Published As

Publication number Publication date
JPS589607B2 (en) 1983-02-22

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