JPS647837A - Carrier lock detecting circuit - Google Patents
Carrier lock detecting circuitInfo
- Publication number
- JPS647837A JPS647837A JP62162668A JP16266887A JPS647837A JP S647837 A JPS647837 A JP S647837A JP 62162668 A JP62162668 A JP 62162668A JP 16266887 A JP16266887 A JP 16266887A JP S647837 A JPS647837 A JP S647837A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency
- signal
- phase error
- demodulating
- 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 execute synchronous detection in a short time with simple circuit constitution, by utilizing a phase error signal which has been detected in a demodulating circuit. CONSTITUTION:Frequency sweep is executed, when a frequency fluctuation range of an input modulating signal has exceeded a synchronizable range of a demodulating circuit 101, and in this case, a phase error signal becomes a beat signal corresponding to a shift frequency of the synchronizable range and the frequency fluctuation range. When this shift frequency converges gradually to zero and enters a band of a low-pass filter 107, the beat signal corresponding to its frequency is inputted to the low-pass filter, converted to a DC level signal in an averaging circuit 109 through one circuit of an absolute value circuit 108 or a square circuit, and compared with a threshold level in the next comparing circuit 110. In the demodulating circuit 101, whether the frequency sweep operation can be continued or not can be decided by a comparison result signal of the comparing circuit 110. In such a way, since the phase error signal which has been detected in the demodulating circuit 101 is utilized, the synchronous detection can be executed in a short time.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62162668A JPS647837A (en) | 1987-06-30 | 1987-06-30 | Carrier lock detecting circuit |
DE3889979T DE3889979T2 (en) | 1987-06-30 | 1988-06-22 | Phase controlled demodulator for a digital messaging system. |
EP88305684A EP0297774B1 (en) | 1987-06-30 | 1988-06-22 | Phase controlled demodulator for digital communications system |
CA000570667A CA1278611C (en) | 1987-06-30 | 1988-06-29 | Phase controlled demodulator for digital communications system |
AU18501/88A AU599294B2 (en) | 1987-06-30 | 1988-06-29 | Phase controlled demodulator for digital communications system |
US07/213,368 US4853642A (en) | 1987-06-30 | 1988-06-30 | Phase controlled demodulator for digital communications system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62162668A JPS647837A (en) | 1987-06-30 | 1987-06-30 | Carrier lock detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647837A true JPS647837A (en) | 1989-01-11 |
Family
ID=15759012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62162668A Pending JPS647837A (en) | 1987-06-30 | 1987-06-30 | Carrier lock detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647837A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04167646A (en) * | 1990-10-26 | 1992-06-15 | Nec Corp | Automatic frequency control system |
EP0710675A2 (en) | 1994-10-28 | 1996-05-08 | Rohm And Haas Company | Improved method for forming polymers |
EP1980914A1 (en) | 2007-04-10 | 2008-10-15 | Xerox Corporation | Chemical toner with covalently bonded release agent |
US8101240B2 (en) | 2006-06-06 | 2012-01-24 | Rohm And Haas Company | Release coating and process |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4848056A (en) * | 1971-10-20 | 1973-07-07 | ||
JPS53128257A (en) * | 1977-04-15 | 1978-11-09 | Nec Corp | Artificial lead-in evasion circuit for reference carrier reproduction circuit |
JPS5835428A (en) * | 1981-08-27 | 1983-03-02 | Mitsubishi Electric Corp | Temperature memory element |
-
1987
- 1987-06-30 JP JP62162668A patent/JPS647837A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4848056A (en) * | 1971-10-20 | 1973-07-07 | ||
JPS53128257A (en) * | 1977-04-15 | 1978-11-09 | Nec Corp | Artificial lead-in evasion circuit for reference carrier reproduction circuit |
JPS5835428A (en) * | 1981-08-27 | 1983-03-02 | Mitsubishi Electric Corp | Temperature memory element |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04167646A (en) * | 1990-10-26 | 1992-06-15 | Nec Corp | Automatic frequency control system |
EP0710675A2 (en) | 1994-10-28 | 1996-05-08 | Rohm And Haas Company | Improved method for forming polymers |
US8101240B2 (en) | 2006-06-06 | 2012-01-24 | Rohm And Haas Company | Release coating and process |
EP1980914A1 (en) | 2007-04-10 | 2008-10-15 | Xerox Corporation | Chemical toner with covalently bonded release agent |
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