JPS55107325A - Automatic frequency control circuit for receiver - Google Patents
Automatic frequency control circuit for receiverInfo
- Publication number
- JPS55107325A JPS55107325A JP1462779A JP1462779A JPS55107325A JP S55107325 A JPS55107325 A JP S55107325A JP 1462779 A JP1462779 A JP 1462779A JP 1462779 A JP1462779 A JP 1462779A JP S55107325 A JPS55107325 A JP S55107325A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- level
- frequency control
- automatic frequency
- 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
Links
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
PURPOSE: To make effective the automatic frequency control, by operating the automatic frequency control circuit only at the muting release period and limiting the level when the level of control signal of the circuit is more than a given value.
CONSTITUTION: In the FM radio receiver, muting signal is obtained at the terminal 6M of the integrated circuit 6. With the absence of reception signal, the signal of level 1 is obtained at the terminal 6M, and the transistor Tr17 is turned on to avoid feeding the output of the Miller integration circuit 11 to the variable capapacitor 13 to make inoperative the automatic frequency control AFC. When the reception frequency approaches the center frequency of the intermediate frequency, the signal at the terminal 6M is level 0 to turn off Tr17 and AFC is operative. When the muting is released and the output of the circuit 11 is more than a given range, the limiter circuit 19 is operated, the output signal of the circuit 11 is fed to the variable capacitor 13 as it is to perform servo-locking. But, if the next station is received, the servo-locking is released to make ease of tuning and effective AFC.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1462779A JPS55107325A (en) | 1979-02-09 | 1979-02-09 | Automatic frequency control circuit for receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1462779A JPS55107325A (en) | 1979-02-09 | 1979-02-09 | Automatic frequency control circuit for receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55107325A true JPS55107325A (en) | 1980-08-18 |
JPS6113411B2 JPS6113411B2 (en) | 1986-04-14 |
Family
ID=11866428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1462779A Granted JPS55107325A (en) | 1979-02-09 | 1979-02-09 | Automatic frequency control circuit for receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55107325A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5894224A (en) * | 1981-11-30 | 1983-06-04 | Nec Home Electronics Ltd | Frequency stabilizing circuit and simple tuning displaying circuit of am receiver |
JPS5988957U (en) * | 1982-12-07 | 1984-06-16 | 三洋電機株式会社 | FM receiver |
-
1979
- 1979-02-09 JP JP1462779A patent/JPS55107325A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5894224A (en) * | 1981-11-30 | 1983-06-04 | Nec Home Electronics Ltd | Frequency stabilizing circuit and simple tuning displaying circuit of am receiver |
JPS5988957U (en) * | 1982-12-07 | 1984-06-16 | 三洋電機株式会社 | FM receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS6113411B2 (en) | 1986-04-14 |
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