JPS55134531A - Automatic frequency control system - Google Patents
Automatic frequency control systemInfo
- Publication number
- JPS55134531A JPS55134531A JP4204479A JP4204479A JPS55134531A JP S55134531 A JPS55134531 A JP S55134531A JP 4204479 A JP4204479 A JP 4204479A JP 4204479 A JP4204479 A JP 4204479A JP S55134531 A JPS55134531 A JP S55134531A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- jump
- output
- much
- 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
- H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To shorten the time of synchronization by reducing sweeps in time by allowing a local oscillator to give a jump and sweep as much as a fixed frequency by providing carrier signals detecting circuits at appropriate frequency intervals. CONSTITUTION:Five carrier signal detecting circuits 6 of f-2, f-1, f0, f1, and f2 are provided. When the output of mixer 1, i.e., a signal of a difference frequency between high-frequency reception signal frequency (f) and local oscillator 2 is detected at f1, for example, of circuit 6 through sweep operations 2 and 11, detection output DETf1 is supplied to control circuit 11 via jump frequency value output circuit 7 and circuit 11 gives oscillator 2 a jump in the direction of frequency f0 as much as a frequency value, preset corresponding to each circuit 6, namely, a frequency difference of ¦f0-f1¦ in this case through relative operations of circuits 7 and 11, jump frequency value correcting circuit 8, and voltage adding circuit 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4204479A JPS598087B2 (en) | 1979-04-09 | 1979-04-09 | Automatic frequency control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4204479A JPS598087B2 (en) | 1979-04-09 | 1979-04-09 | Automatic frequency control method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55134531A true JPS55134531A (en) | 1980-10-20 |
JPS598087B2 JPS598087B2 (en) | 1984-02-22 |
Family
ID=12625120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4204479A Expired JPS598087B2 (en) | 1979-04-09 | 1979-04-09 | Automatic frequency control method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS598087B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152717A (en) * | 1983-02-18 | 1984-08-31 | Sony Corp | Channel selecting circuit of pll frequency synthesizer system |
JPH044615A (en) * | 1990-04-23 | 1992-01-09 | Pioneer Electron Corp | Radio receiver |
-
1979
- 1979-04-09 JP JP4204479A patent/JPS598087B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152717A (en) * | 1983-02-18 | 1984-08-31 | Sony Corp | Channel selecting circuit of pll frequency synthesizer system |
JPH0524686B2 (en) * | 1983-02-18 | 1993-04-08 | Sony Corp | |
JPH044615A (en) * | 1990-04-23 | 1992-01-09 | Pioneer Electron Corp | Radio receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS598087B2 (en) | 1984-02-22 |
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