JPS5664516A - Afc circuit - Google Patents
Afc circuitInfo
- Publication number
- JPS5664516A JPS5664516A JP14096179A JP14096179A JPS5664516A JP S5664516 A JPS5664516 A JP S5664516A JP 14096179 A JP14096179 A JP 14096179A JP 14096179 A JP14096179 A JP 14096179A JP S5664516 A JPS5664516 A JP S5664516A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- action
- tuning
- afc
- 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
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To eliminate the switch operation with every tuning action and thus simplify the operation for an FM radio receiver or the like, by securing an automatic on/off control for the AFC action in accordance with the intensity of the received signal. CONSTITUTION:No output is delivered from the intermediate frequency amplifying circuit in case when a receiver is under the detuning state. Accordingly, the output of the control circuit 8 is approximate to zero. In this case, the reference voltage applied to the input terminal (a) of one side in the switching circuit 7 emerges at the output terminal (d). This voltage is then applied to the variable capacity diode 6 forming the local oscillating circuit 3. Then the tuning action is started to get close to the tuning point, and thus the circuit 7 is switched. As a result, the AFC signal applied to the input terminal (b) is applied to the diode 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14096179A JPS5664516A (en) | 1979-10-30 | 1979-10-30 | Afc circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14096179A JPS5664516A (en) | 1979-10-30 | 1979-10-30 | Afc circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5664516A true JPS5664516A (en) | 1981-06-01 |
Family
ID=15280835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14096179A Pending JPS5664516A (en) | 1979-10-30 | 1979-10-30 | Afc circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5664516A (en) |
-
1979
- 1979-10-30 JP JP14096179A patent/JPS5664516A/en active Pending
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