JPS5720060A - Synchronous detector of four-phase phase-modulated wave demodulating circuit - Google Patents

Synchronous detector of four-phase phase-modulated wave demodulating circuit

Info

Publication number
JPS5720060A
JPS5720060A JP8483280A JP8483280A JPS5720060A JP S5720060 A JPS5720060 A JP S5720060A JP 8483280 A JP8483280 A JP 8483280A JP 8483280 A JP8483280 A JP 8483280A JP S5720060 A JPS5720060 A JP S5720060A
Authority
JP
Japan
Prior art keywords
phase
output
voltage
modulated wave
quadruplicating
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
Application number
JP8483280A
Other languages
Japanese (ja)
Inventor
Yoichi Moriya
Yoshitomo Sakado
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8483280A priority Critical patent/JPS5720060A/en
Publication of JPS5720060A publication Critical patent/JPS5720060A/en
Pending legal-status Critical Current

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
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop

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 achieve accurate synchronous detection by increasing a difference in DC voltage between a synchronous and an asynchronous state by performing phase detection after increasing both output signals of a voltage-controlled oscillator and reverse modulator four times. CONSTITUTION:A quadruplicating device 116 increases a four-phase phase-modulated wave, which is the output of the voltage-controlled oscillator 4 of a phase synchronizing circuit 201, by four times, and a quadruplicating device 117 increases a four-phase phase-modulated wave, the output of a reverse modulating circuit 203, by four times. Then, a phase detector 6 detects the phase difference between the outputs of those quadruplicating devices 116 and 117. The output of this phase detector 6 is supplied to an LPF7, whose output is sent to a voltage comparing circuit 8 to be compared with a reference voltage. consequently, the output of the reverse modulator 203 has uniform phase distribution between 0-2pi, so the difference between DC voltages obtained in a synchronous and an asynchronous state is increased.
JP8483280A 1980-06-19 1980-06-19 Synchronous detector of four-phase phase-modulated wave demodulating circuit Pending JPS5720060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8483280A JPS5720060A (en) 1980-06-19 1980-06-19 Synchronous detector of four-phase phase-modulated wave demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8483280A JPS5720060A (en) 1980-06-19 1980-06-19 Synchronous detector of four-phase phase-modulated wave demodulating circuit

Publications (1)

Publication Number Publication Date
JPS5720060A true JPS5720060A (en) 1982-02-02

Family

ID=13841743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8483280A Pending JPS5720060A (en) 1980-06-19 1980-06-19 Synchronous detector of four-phase phase-modulated wave demodulating circuit

Country Status (1)

Country Link
JP (1) JPS5720060A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187935A (en) * 1987-01-30 1988-08-03 Sharp Corp Pll circuit
JPH06177924A (en) * 1992-10-13 1994-06-24 Nec Corp Phase locked loop detection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187935A (en) * 1987-01-30 1988-08-03 Sharp Corp Pll circuit
JPH06177924A (en) * 1992-10-13 1994-06-24 Nec Corp Phase locked loop detection circuit

Similar Documents

Publication Publication Date Title
GB2290387A (en) Method and apparatus for determining the charge condition of an electrochemical cell
DE2966282D1 (en) Digital phase control circuit with auxiliary circuit
GB1157888A (en) Improvements in and relating to Inverters
US3353101A (en) Demodulation apparatus for phasemodulated telegraphic code
JPS5720060A (en) Synchronous detector of four-phase phase-modulated wave demodulating circuit
KR850003092A (en) Phase Detector for Synchronous System
GB1498725A (en) Synchronous demodulator circuit
JPS5497310A (en) Phase synchronizing circuit
JPS5364570A (en) Phase comparator
JPS5528662A (en) Fm stereo demodulation circuit
JPS5466062A (en) Clock synchronous circuit
JPS5520074A (en) Digital phase synchronous circuit
JPS57171808A (en) Fm demodulating circuit
JPS5582974A (en) Phase synchronizing system
JPS55149554A (en) Carrier reproducing circuit
JPS554134A (en) Phase synchronizer
GB2231408A (en) Sampling circuits for reactive power measurements
JPS52124849A (en) Timing signal detection circuit
JPS5610714A (en) Frequency modulating device
JPS5643832A (en) Phase synchronizing circuit
JPS552937A (en) Phase rotation detector
JPS5646669A (en) Pwm system inverter
JPS57162841A (en) Digital pll circuit system
JPS6461120A (en) Phase synchronizing oscillator
JPS5343459A (en) Phase synchronous oscillator