JPS55161416A - Search preset channel selecting unit - Google Patents

Search preset channel selecting unit

Info

Publication number
JPS55161416A
JPS55161416A JP6752779A JP6752779A JPS55161416A JP S55161416 A JPS55161416 A JP S55161416A JP 6752779 A JP6752779 A JP 6752779A JP 6752779 A JP6752779 A JP 6752779A JP S55161416 A JPS55161416 A JP S55161416A
Authority
JP
Japan
Prior art keywords
search
preset
minimum value
value
tuning voltage
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
JP6752779A
Other languages
Japanese (ja)
Inventor
Tsugio Itagaki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6752779A priority Critical patent/JPS55161416A/en
Publication of JPS55161416A publication Critical patent/JPS55161416A/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
    • 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 eliminate malfunctions of the search preset operation just after band switching, by stopping counting of the counter, which controls a pulse width modulator, until the tuning voltage changes from the maximum value to the minimum value and becomes a normal value just after band switching. CONSTITUTION:At a switching time of search preset, the maximum value and the minimum value of the turning voltage are detected from the output of preset counter 7 by turning voltage maximum and minimum deciding circuit 14 for the purpose of changing the tuning voltage from the maximum value to the minimum value. By the input of this detection signal, a search stop signal is applied to preset control 6 from search stop signal generating part 15 to stop counting of preset counter 7 during time T required for arrival at the minimum value of the tuning voltage just after band switching. After time T, search is started again, and thus, a normal search preset operation is performed because the tuning voltage is lowered to the minimum value.
JP6752779A 1979-06-01 1979-06-01 Search preset channel selecting unit Pending JPS55161416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6752779A JPS55161416A (en) 1979-06-01 1979-06-01 Search preset channel selecting unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6752779A JPS55161416A (en) 1979-06-01 1979-06-01 Search preset channel selecting unit

Publications (1)

Publication Number Publication Date
JPS55161416A true JPS55161416A (en) 1980-12-16

Family

ID=13347529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6752779A Pending JPS55161416A (en) 1979-06-01 1979-06-01 Search preset channel selecting unit

Country Status (1)

Country Link
JP (1) JPS55161416A (en)

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