JPS5652929A - Automatic tuning circuit of electronic tuner - Google Patents

Automatic tuning circuit of electronic tuner

Info

Publication number
JPS5652929A
JPS5652929A JP12908179A JP12908179A JPS5652929A JP S5652929 A JPS5652929 A JP S5652929A JP 12908179 A JP12908179 A JP 12908179A JP 12908179 A JP12908179 A JP 12908179A JP S5652929 A JPS5652929 A JP S5652929A
Authority
JP
Japan
Prior art keywords
divider
voltage
switch
channel
output
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
JP12908179A
Other languages
Japanese (ja)
Inventor
Koichi Matsuda
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP12908179A priority Critical patent/JPS5652929A/en
Publication of JPS5652929A publication Critical patent/JPS5652929A/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 make it possible to execute the automatic tuning easily and inexpensively, by counting a tuning point detecting output in the vicinity of the tuning point of each broadcasting radio wave by the divider, and stopping a DC detecting output which is applied to the electric charging and discharging circuit for controlling the local oscillator, in case a fixed dividing ratio output has been generated. CONSTITUTION:The numerical value (for instance, ''3'' in case of channel 3) corresponding to the channel of a desired rank is set to the divider 12 by the channel selection switch 14. Subsequently, FF13 is set by operating the start switch 15, at the same time the reset switch 18 is closed, the electric discharging circuit 17 discharges the voltage of the voltage holding device 20 through the addition point 19, and the initial voltage is set to the varactor 3. When the switch 18 is closed after a fixed time has passed, the voltage supplied to the varactor rises gradually, and the frequency is gradually swept, as well. In this state, a pulse corresponding to number of the broadcasting station is supplied to the divider 12 through the inverter 11, and when it conforms with the numerical value which has been set to the divider 12 in advance, a reset output R is sent out and the sweep is stopped.
JP12908179A 1979-10-05 1979-10-05 Automatic tuning circuit of electronic tuner Pending JPS5652929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12908179A JPS5652929A (en) 1979-10-05 1979-10-05 Automatic tuning circuit of electronic tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12908179A JPS5652929A (en) 1979-10-05 1979-10-05 Automatic tuning circuit of electronic tuner

Publications (1)

Publication Number Publication Date
JPS5652929A true JPS5652929A (en) 1981-05-12

Family

ID=15000603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12908179A Pending JPS5652929A (en) 1979-10-05 1979-10-05 Automatic tuning circuit of electronic tuner

Country Status (1)

Country Link
JP (1) JPS5652929A (en)

Similar Documents

Publication Publication Date Title
US3824475A (en) Scanning radio receiver
JPS54102814A (en) Synthesizer receiver
JPS5652929A (en) Automatic tuning circuit of electronic tuner
GB1389071A (en) Electrical channel selscting devices
US4207529A (en) Radio receiver
GB1445031A (en) Broadcast receivers
JPH0362048B2 (en)
JPS5477004A (en) Channel selector
JPS577623A (en) Automatic sweeping device
JPS54104221A (en) Elastic surface wave channel selector
JPS54157015A (en) Electronic channel selection unit
JPS5650621A (en) Automatic tuning circuit for electronic tuner
JPS577622A (en) Electronic tuner
JPS5619218A (en) Tuning voltage output circuit
JPS5482109A (en) Electronic tuning type receiver
GB1472223A (en) Super-heterodyne receiver with a digitally adjustable tuning arrangement
JPS54157016A (en) Electronic channel selection unit
JPS5477005A (en) Sweep receiver
JPS5516583A (en) Program reservation unit
JPS6338582Y2 (en)
JPS5758409A (en) Freqiemcu synthesizer
JPS54157014A (en) Electronic channel selection unit
JPS5668024A (en) Channel selector
JPS56107626A (en) Synthesizer receiver
JPS56117430A (en) Phase detecting circuit