JPS5637755A - Multiphase modulating device - Google Patents
Multiphase modulating deviceInfo
- Publication number
- JPS5637755A JPS5637755A JP11344779A JP11344779A JPS5637755A JP S5637755 A JPS5637755 A JP S5637755A JP 11344779 A JP11344779 A JP 11344779A JP 11344779 A JP11344779 A JP 11344779A JP S5637755 A JPS5637755 A JP S5637755A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- supplied
- offset
- phase
- delivered
- 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
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
- H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
- H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
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 simplify the circuit constitution by providing the code converting means consisting of the exclusive logic sum and the delay means which gives the offset equivalent to a half time of the symbol period at the input circuit of the N-phase PSK modulator. PURPOSE:In the 4(N=4)-phase PSK modulator, the binary signals of two series are supplied to the transmission logic circuit 5 from the terminals 3 and 4. At the circuit 5, the exclusive logic sums 5 and 10 are secured for both the input signal and the signal received the 1-bit delay 7 and 11, and one of the sums is supplied to the driving circuit 8 after the code conversion with the other sum supplied to the driving circuit 12 after an offset given by 1/2.T (T: symbol period) at the delaying circuit 20 respectively. The conduction and the nonconduction of the diodes 18 and 19 of the phase modulator 2' are controlled by the output signals of the circuits 8 and 12 and with an offset of 1/2.T. The carrier wave of the oscillator 1 is supplied to the branch element 21 and then to the circulators CL13 and 15 with a phase difference of 90 deg.. Then the carrier wave is supplied to transmission lines 23 and 16 to come back and then delivered through the CL13 and 15 to be compounded via the compound element 22 to be then delivered through the modulation output terminal 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11344779A JPS5637755A (en) | 1979-09-03 | 1979-09-03 | Multiphase modulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11344779A JPS5637755A (en) | 1979-09-03 | 1979-09-03 | Multiphase modulating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5637755A true JPS5637755A (en) | 1981-04-11 |
Family
ID=14612454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11344779A Pending JPS5637755A (en) | 1979-09-03 | 1979-09-03 | Multiphase modulating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5637755A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58175392A (en) * | 1982-04-07 | 1983-10-14 | Nec Corp | Digital color encorder |
| JPH06105324A (en) * | 1992-09-21 | 1994-04-15 | Matsushita Electric Ind Co Ltd | Digital modulator |
| US5638135A (en) * | 1995-04-06 | 1997-06-10 | Ricoh Company, Ltd. | Digital color encoder with improved circuitry |
| US6756926B2 (en) | 2000-06-26 | 2004-06-29 | Fujitsu Limited | Optical transmitter and code conversion circuit used therefor |
| KR100588753B1 (en) * | 2001-12-13 | 2006-06-13 | 매그나칩 반도체 유한회사 | PSK type modulator |
-
1979
- 1979-09-03 JP JP11344779A patent/JPS5637755A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58175392A (en) * | 1982-04-07 | 1983-10-14 | Nec Corp | Digital color encorder |
| JPH06105324A (en) * | 1992-09-21 | 1994-04-15 | Matsushita Electric Ind Co Ltd | Digital modulator |
| US5638135A (en) * | 1995-04-06 | 1997-06-10 | Ricoh Company, Ltd. | Digital color encoder with improved circuitry |
| US6756926B2 (en) | 2000-06-26 | 2004-06-29 | Fujitsu Limited | Optical transmitter and code conversion circuit used therefor |
| KR100588753B1 (en) * | 2001-12-13 | 2006-06-13 | 매그나칩 반도체 유한회사 | PSK type modulator |
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