JPS5652929A - Automatic tuning circuit of electronic tuner - Google Patents
Automatic tuning circuit of electronic tunerInfo
- 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
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.
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) |
-
1979
- 1979-10-05 JP JP12908179A patent/JPS5652929A/en active Pending
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