JPS5646321A - Channel selector - Google Patents

Channel selector

Info

Publication number
JPS5646321A
JPS5646321A JP12065979A JP12065979A JPS5646321A JP S5646321 A JPS5646321 A JP S5646321A JP 12065979 A JP12065979 A JP 12065979A JP 12065979 A JP12065979 A JP 12065979A JP S5646321 A JPS5646321 A JP S5646321A
Authority
JP
Japan
Prior art keywords
digital signal
preset
change
pulse
value
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
JP12065979A
Other languages
Japanese (ja)
Inventor
Shigeo Matsuura
Eisaku Akutsu
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 JP12065979A priority Critical patent/JPS5646321A/en
Publication of JPS5646321A publication Critical patent/JPS5646321A/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 enable to accurately preset the normal broadcast station only, by assuring the sufficient range of change without almost changing the preset time and completely eliminating the malfunction at the changeover of reception band, in the channel selector for TV receivers. CONSTITUTION:When the digital signal value is changed, the tuning voltage value changes with a delay by a given time determined with the time constant of the integral network 7. Further, when the digital signal value reaches the maximum value, the maximum value detection circuit 12 is operated and the trigger signal is input to the pulse generation circuit 14. The circuit 14 outputs the pulse of a given time from the moment the trigger signal is input, and the change in the digital signal value is stopped for the period when this pulse is output. Thus, the actual tuning voltage can reach the maximum voltage corresponding to the digital signal. Then, sufficient range of change can be assured without almost changing the preset time, the malfunction at reception band changeover can completely be eliminated, and the normal broadcast stations only can accurately be preset.
JP12065979A 1979-09-21 1979-09-21 Channel selector Pending JPS5646321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12065979A JPS5646321A (en) 1979-09-21 1979-09-21 Channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12065979A JPS5646321A (en) 1979-09-21 1979-09-21 Channel selector

Publications (1)

Publication Number Publication Date
JPS5646321A true JPS5646321A (en) 1981-04-27

Family

ID=14791706

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12065979A Pending JPS5646321A (en) 1979-09-21 1979-09-21 Channel selector

Country Status (1)

Country Link
JP (1) JPS5646321A (en)

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