JPS5549029A - Automatic channel selector of am receiver - Google Patents
Automatic channel selector of am receiverInfo
- Publication number
- JPS5549029A JPS5549029A JP12196078A JP12196078A JPS5549029A JP S5549029 A JPS5549029 A JP S5549029A JP 12196078 A JP12196078 A JP 12196078A JP 12196078 A JP12196078 A JP 12196078A JP S5549029 A JPS5549029 A JP S5549029A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- receiver
- pll
- mixer
- 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)
Abstract
PURPOSE: To obtain an accurate automatic channel selector with excellent temperature characteristics by providing an AM receiver with PLL and a lock detection circuit which receives a beat signal between an intermediate frequency signal and reference frequency signal.
CONSTITUTION: Part of an intermediate frequency signal from mixer 3 of an AM receiver is applied to mixer 9 through limiter circuit 8. Mixer 9 is applied with a signal obtained by dividing 11 an output from reference oscillator 10 composed of a crystal oscillator with excellent temperature characteristics, and a beat signal between the both is inputted to PLL. In PLL, lock detection circuit 17 generates a detection signal, when an output from devider 16 is in phase with an input to phase comparator 13, to control automatic stop signal generating circuit 18, where an auto-stop signal is generated and applied to control circuit 19. Circuit 19, counting up or down on receiving a signal from oscillator 10 as clocks, stops counting by a signal from circuit 18 and hold a count value right before it, thereby holding a direct-current value to be applied to diode D of local oscillator 4.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12196078A JPS594888B2 (en) | 1978-10-05 | 1978-10-05 | AM receiver automatic channel selection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12196078A JPS594888B2 (en) | 1978-10-05 | 1978-10-05 | AM receiver automatic channel selection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5549029A true JPS5549029A (en) | 1980-04-08 |
JPS594888B2 JPS594888B2 (en) | 1984-02-01 |
Family
ID=14824153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12196078A Expired JPS594888B2 (en) | 1978-10-05 | 1978-10-05 | AM receiver automatic channel selection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS594888B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57124590U (en) * | 1981-01-30 | 1982-08-03 | ||
JPS57124924A (en) * | 1981-01-28 | 1982-08-04 | Sanyo Electric Co Ltd | Automatic search tuner |
JPS57194620A (en) * | 1981-05-27 | 1982-11-30 | Toshiba Corp | Tuning discriminating circuit of auto search receiver |
-
1978
- 1978-10-05 JP JP12196078A patent/JPS594888B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57124924A (en) * | 1981-01-28 | 1982-08-04 | Sanyo Electric Co Ltd | Automatic search tuner |
JPS57124590U (en) * | 1981-01-30 | 1982-08-03 | ||
JPS6129910Y2 (en) * | 1981-01-30 | 1986-09-02 | ||
JPS57194620A (en) * | 1981-05-27 | 1982-11-30 | Toshiba Corp | Tuning discriminating circuit of auto search receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS594888B2 (en) | 1984-02-01 |
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