JPS5713809A - Automatic channel selection device of am tuner - Google Patents
Automatic channel selection device of am tunerInfo
- Publication number
- JPS5713809A JPS5713809A JP8820780A JP8820780A JPS5713809A JP S5713809 A JPS5713809 A JP S5713809A JP 8820780 A JP8820780 A JP 8820780A JP 8820780 A JP8820780 A JP 8820780A JP S5713809 A JPS5713809 A JP S5713809A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- channel selection
- generator
- beat
- selection device
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
- H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To achieve accurate channel selection when search intervals are 1kHz steps, by providing a channel selection device on a PLL frequency synthesizer system with a beat component detecting means consisting of narrow-band BPFs. CONSTITUTION:A local oscillation signal generator 3 controlled by an automatic channel selection control circuit 7 outputs a local oscillation signal f in every 1kHz step. This is mixed with a received signal fr to obtain an IF signal fc, which is inputted to a search stop signal generator 16 via a rectifier 17. Simultaneously, the IF signal fc and a prescribed IF signal fio are mixed together to generate beat components, which are inputted to the signal generator 16 via a beat component detecting means consisting of narrow-band BPFs 10-12. Then, the generator 16, when the IF signal fc is present and the beat components do not arrive, outputs a search stop signal to the control part 7. Thus, accurate channel-selecting operation is carried out.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8820780A JPS5713809A (en) | 1980-06-27 | 1980-06-27 | Automatic channel selection device of am tuner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8820780A JPS5713809A (en) | 1980-06-27 | 1980-06-27 | Automatic channel selection device of am tuner |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5713809A true JPS5713809A (en) | 1982-01-23 |
JPS622726B2 JPS622726B2 (en) | 1987-01-21 |
Family
ID=13936450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8820780A Granted JPS5713809A (en) | 1980-06-27 | 1980-06-27 | Automatic channel selection device of am tuner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5713809A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61103310A (en) * | 1984-10-24 | 1986-05-21 | アールシーエー トムソン ライセンシング コーポレイシヨン | Fine tuning device for superheterodyne receiver |
JPS63311813A (en) * | 1987-06-15 | 1988-12-20 | Sony Corp | Synthesizer receiver |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443603A (en) * | 1977-09-13 | 1979-04-06 | Nec Corp | High-speed catching device for receiving signal |
-
1980
- 1980-06-27 JP JP8820780A patent/JPS5713809A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443603A (en) * | 1977-09-13 | 1979-04-06 | Nec Corp | High-speed catching device for receiving signal |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61103310A (en) * | 1984-10-24 | 1986-05-21 | アールシーエー トムソン ライセンシング コーポレイシヨン | Fine tuning device for superheterodyne receiver |
JPS63311813A (en) * | 1987-06-15 | 1988-12-20 | Sony Corp | Synthesizer receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS622726B2 (en) | 1987-01-21 |
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