JPS5733824A - Channel selection device - Google Patents

Channel selection device

Info

Publication number
JPS5733824A
JPS5733824A JP10938280A JP10938280A JPS5733824A JP S5733824 A JPS5733824 A JP S5733824A JP 10938280 A JP10938280 A JP 10938280A JP 10938280 A JP10938280 A JP 10938280A JP S5733824 A JPS5733824 A JP S5733824A
Authority
JP
Japan
Prior art keywords
voltage
frequency
case
circuit
sweeping
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
JP10938280A
Other languages
Japanese (ja)
Inventor
Yoshiharu Nagahara
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10938280A priority Critical patent/JPS5733824A/en
Publication of JPS5733824A publication Critical patent/JPS5733824A/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

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To select a channel swiftly and also exactly, by increasing a sweeping speed between channels. CONSTITUTION:Voltage (a) having an S-curve characteristic generated to reference voltage (b) from a frequency discriminating circuit 8. In this case, offset voltage (c)is apllied to a voltage comparing circuit 9. In case when the frequency is swept from low to high, voltage (c)>voltage (a) in the range which is lower is lower than the object frequency f0. In this case, a sweeping is increased. When approaching the object frequency, the voltage (a) is raised along the S-curve and becomes like voltage (a)>voltage (c). In this case, the sweeping speed is decreased by a controlling circuit 11. At this time, the offset voltage (c) of the voltage comparing circuit is switched to the reference voltage (b) which is generated at the time of exact tuning. When the sweep proceeds to the frequency f0, the voltage (b)>the voltage (a) is obtained. When it is detected, the sweep is stopped.
JP10938280A 1980-08-08 1980-08-08 Channel selection device Pending JPS5733824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10938280A JPS5733824A (en) 1980-08-08 1980-08-08 Channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10938280A JPS5733824A (en) 1980-08-08 1980-08-08 Channel selection device

Publications (1)

Publication Number Publication Date
JPS5733824A true JPS5733824A (en) 1982-02-24

Family

ID=14508815

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10938280A Pending JPS5733824A (en) 1980-08-08 1980-08-08 Channel selection device

Country Status (1)

Country Link
JP (1) JPS5733824A (en)

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