JPS6457854A - Automatic frequency control circuit - Google Patents
Automatic frequency control circuitInfo
- Publication number
- JPS6457854A JPS6457854A JP62213991A JP21399187A JPS6457854A JP S6457854 A JPS6457854 A JP S6457854A JP 62213991 A JP62213991 A JP 62213991A JP 21399187 A JP21399187 A JP 21399187A JP S6457854 A JPS6457854 A JP S6457854A
- Authority
- JP
- Japan
- Prior art keywords
- sweeping
- frequency
- synchronization
- start point
- pull
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To contrive the shortening of the frequency pull-in time, by moving a sweeping start point to at least two frequencies apart from the oscillating frequency at synchronization step-out in response to the output detecting the synchronism step-out from a lock detector so as to execute frequency locking. CONSTITUTION:A sweeping circuit 32 moves the sweeping start point to two frequencies sequentially apart from the oscillating frequency at the synchronization step-out in response to the output detecting the of synchronization step-out from a lock detection circuit 19. That is, when a quasi-synchronization carrier recovery circuit, the frequency lower than the oscillating frequency fc by the hold range at the out of synchronization at first is used as the sweeping start point to apply sweeping and when the synchronization cannot be taken even therewith, the frequency lower than the oscillating frequency fc by a value larger than the hold range is used as the sweeping start point to apply sweeping for frequency pull-in. The frequency pull-in is executed in a short time by the unidirectivity of the sweeping.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213991A JPS6457854A (en) | 1987-08-27 | 1987-08-27 | Automatic frequency control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213991A JPS6457854A (en) | 1987-08-27 | 1987-08-27 | Automatic frequency control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6457854A true JPS6457854A (en) | 1989-03-06 |
Family
ID=16648447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62213991A Pending JPS6457854A (en) | 1987-08-27 | 1987-08-27 | Automatic frequency control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6457854A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0336849A (en) * | 1989-07-03 | 1991-02-18 | Fujitsu Ltd | Costas loop type demodulating system |
JPH06237277A (en) * | 1993-02-09 | 1994-08-23 | Nec Corp | Psk carrier signal regenerating device |
JP2011109472A (en) * | 2009-11-18 | 2011-06-02 | Toshiba Corp | Demodulator |
-
1987
- 1987-08-27 JP JP62213991A patent/JPS6457854A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0336849A (en) * | 1989-07-03 | 1991-02-18 | Fujitsu Ltd | Costas loop type demodulating system |
JPH06237277A (en) * | 1993-02-09 | 1994-08-23 | Nec Corp | Psk carrier signal regenerating device |
JP2011109472A (en) * | 2009-11-18 | 2011-06-02 | Toshiba Corp | Demodulator |
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