JPS57121314A - Channel selecting device - Google Patents

Channel selecting device

Info

Publication number
JPS57121314A
JPS57121314A JP643181A JP643181A JPS57121314A JP S57121314 A JPS57121314 A JP S57121314A JP 643181 A JP643181 A JP 643181A JP 643181 A JP643181 A JP 643181A JP S57121314 A JPS57121314 A JP S57121314A
Authority
JP
Japan
Prior art keywords
output
accordance
resistances
pulse
resistance
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
JP643181A
Other languages
Japanese (ja)
Inventor
Ikuo Yoshiki
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 JP643181A priority Critical patent/JPS57121314A/en
Publication of JPS57121314A publication Critical patent/JPS57121314A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To improve the reliability of channel selection, by providing resistances on cards which are installed in accordance with selecting positions and selecting channels by a digital signal which is formed in accordance with resistance values. CONSTITUTION:Cards 2a-2n where resistances Ra-Rn different in value for every channel are formed by printing or the like are provided correspondingly to key switches 3a-3n, and a capacitor 4 is provided which constitutes an integral network together with resistances Ra-Rn. When the key switch 3i is depressed, a position discriminating and pulse output circuit 8 detects that a position (i) is selected, and the pulse of a prescribed width is outputted from a terminal I. This pulse is integrated by the resistance Ri and the capacitor 4 and is applied to an A/D converter 5b only while the integral output is higher than the threshold voltage of an input circuit 5a. The digital output of the A/D converter 5b corresponds to the value of the resistance Ri, and a turning voltage generated in accordance with this output is applied to a tuner 11.
JP643181A 1981-01-21 1981-01-21 Channel selecting device Pending JPS57121314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP643181A JPS57121314A (en) 1981-01-21 1981-01-21 Channel selecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP643181A JPS57121314A (en) 1981-01-21 1981-01-21 Channel selecting device

Publications (1)

Publication Number Publication Date
JPS57121314A true JPS57121314A (en) 1982-07-28

Family

ID=11638198

Family Applications (1)

Application Number Title Priority Date Filing Date
JP643181A Pending JPS57121314A (en) 1981-01-21 1981-01-21 Channel selecting device

Country Status (1)

Country Link
JP (1) JPS57121314A (en)

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