JPS57135555A - Phase continuous fsk modulating circuit - Google Patents
Phase continuous fsk modulating circuitInfo
- Publication number
- JPS57135555A JPS57135555A JP2170281A JP2170281A JPS57135555A JP S57135555 A JPS57135555 A JP S57135555A JP 2170281 A JP2170281 A JP 2170281A JP 2170281 A JP2170281 A JP 2170281A JP S57135555 A JPS57135555 A JP S57135555A
- Authority
- JP
- Japan
- Prior art keywords
- output
- frequency divider
- data signal
- frequency
- circuit
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
- H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
- H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To facilitate adjustment with simple constitution by providing a frequency division ratio setting circuit which varies the frequency division ratio of a variable frequency divider according to the mark and space of a modulated data signal. CONSTITUTION:An output wave from an oscillator 13 is divided into two; one is processed through the frequency division of a fixed frequency divider 14, whose output is applied to a clock output terminal 15 and a data signal pattern detecting circuit 16. The other is inputted to a variable frequency divider 17. A modulated data signal for a mark and space inputted from a terminal 18 is inputted to the data signal pattern detecting circuit 16, whose output is applied from a switch control circuit 27 to the frequency divider 17. In this case, the output of the circuit 27 permits a switch 28 to switch and set a number for frequency division, thus varying the output frequency of the frequency divider 17. The output of this frequency divider 17 is passed through a BPF34 to eliminate higher harmonic component more than double as high as the modulated wave, so that the remainder appears at a terminal 35.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2170281A JPS57135555A (en) | 1981-02-16 | 1981-02-16 | Phase continuous fsk modulating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2170281A JPS57135555A (en) | 1981-02-16 | 1981-02-16 | Phase continuous fsk modulating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57135555A true JPS57135555A (en) | 1982-08-21 |
Family
ID=12062386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2170281A Pending JPS57135555A (en) | 1981-02-16 | 1981-02-16 | Phase continuous fsk modulating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57135555A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5329258A (en) * | 1992-06-26 | 1994-07-12 | Nec Corporation | Multilevel FSK modulator having phase locked loop with controlled transient response |
-
1981
- 1981-02-16 JP JP2170281A patent/JPS57135555A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5329258A (en) * | 1992-06-26 | 1994-07-12 | Nec Corporation | Multilevel FSK modulator having phase locked loop with controlled transient response |
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