JPS5656033A - Automatic channel selector - Google Patents

Automatic channel selector

Info

Publication number
JPS5656033A
JPS5656033A JP13232879A JP13232879A JPS5656033A JP S5656033 A JPS5656033 A JP S5656033A JP 13232879 A JP13232879 A JP 13232879A JP 13232879 A JP13232879 A JP 13232879A JP S5656033 A JPS5656033 A JP S5656033A
Authority
JP
Japan
Prior art keywords
circuit
output
sweep
voltage
offset
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
JP13232879A
Other languages
Japanese (ja)
Other versions
JPS6130771B2 (en
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 JP13232879A priority Critical patent/JPS5656033A/en
Publication of JPS5656033A publication Critical patent/JPS5656033A/en
Publication of JPS6130771B2 publication Critical patent/JPS6130771B2/ja
Granted 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

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To make it possible to stop a sweep at a perfect tuning point by setting two offset voltages as reference values to be compared to the output of a frequency discriminating circuit by a voltage comparing circuit and by controlling a tuning sweep on the basis of comparison results. CONSTITUTION:The output of intermediate frequency amplifier 5 is converted by frequency discriminating circuit 8 into an S-curve output and this output voltage is applied to voltage comparing circuit 9. In this case, reference values to be compared by circuit 9 are offset on the basis of the output of circuit 8 in perfect tuning and tuning sweeping circuit 10 is driven by the output signal of circuit 9 to make a sweep by controlling the variable capacity element of local oscillating circuit 4 and high frequency amplifying circuit 2. When the output of circuit 8 exceeds this offset voltage due to the sweep, the offset voltage is changed into the 2nd smaller offset voltage and when the output of circuit 8 drops below the 2nd offset voltage, the sweep is stopped. Thus, malfunction due to internal noises and disturbance noises can be prevented securely.
JP13232879A 1979-10-12 1979-10-12 Automatic channel selector Granted JPS5656033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13232879A JPS5656033A (en) 1979-10-12 1979-10-12 Automatic channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13232879A JPS5656033A (en) 1979-10-12 1979-10-12 Automatic channel selector

Publications (2)

Publication Number Publication Date
JPS5656033A true JPS5656033A (en) 1981-05-16
JPS6130771B2 JPS6130771B2 (en) 1986-07-16

Family

ID=15078743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13232879A Granted JPS5656033A (en) 1979-10-12 1979-10-12 Automatic channel selector

Country Status (1)

Country Link
JP (1) JPS5656033A (en)

Also Published As

Publication number Publication date
JPS6130771B2 (en) 1986-07-16

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