JPS56119562A - Synchronizing detection system - Google Patents

Synchronizing detection system

Info

Publication number
JPS56119562A
JPS56119562A JP2313980A JP2313980A JPS56119562A JP S56119562 A JPS56119562 A JP S56119562A JP 2313980 A JP2313980 A JP 2313980A JP 2313980 A JP2313980 A JP 2313980A JP S56119562 A JPS56119562 A JP S56119562A
Authority
JP
Japan
Prior art keywords
polarity
signal
value
output
detector
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.)
Granted
Application number
JP2313980A
Other languages
Japanese (ja)
Other versions
JPS6324343B2 (en
Inventor
Takashi Kako
Shigeyuki Umigami
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2313980A priority Critical patent/JPS56119562A/en
Publication of JPS56119562A publication Critical patent/JPS56119562A/en
Publication of JPS6324343B2 publication Critical patent/JPS6324343B2/ja
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To perform synchronizing detection of the training signal correctly, by integrating the polarlity value of the symbol of the signal detected by the polarity detector and the value of the polarity of the preceding symbol stored in the register and by transmitting the output if the integrated result is the positive polarity. CONSTITUTION:Phase comparators PC1 and PC2 receive inputs S1 and S2 of voltage control oscillator VCO different in phase by 180 deg. and training signal SO and generate outputs proportional to cosine of phase differences between them and output signals X and Y through low-off filters LF1 and LF2. Polarity detector OP detects the polarity of signal X and outputs signal x1. When detector OP outputs signal x1 of the polarity of the next symbol, this polarity value and the value of the polarity of the preceding symbol stored in register KG are inputted to multiplier M; and if the multiplied value is the positive polarity, signal ''1'' is output from the output of the inverter. As a result, the polarity of signal X is used to perform synchronizing detection correctly.
JP2313980A 1980-02-26 1980-02-26 Synchronizing detection system Granted JPS56119562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2313980A JPS56119562A (en) 1980-02-26 1980-02-26 Synchronizing detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2313980A JPS56119562A (en) 1980-02-26 1980-02-26 Synchronizing detection system

Publications (2)

Publication Number Publication Date
JPS56119562A true JPS56119562A (en) 1981-09-19
JPS6324343B2 JPS6324343B2 (en) 1988-05-20

Family

ID=12102214

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2313980A Granted JPS56119562A (en) 1980-02-26 1980-02-26 Synchronizing detection system

Country Status (1)

Country Link
JP (1) JPS56119562A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014557A (en) * 1983-07-06 1985-01-25 Nec Corp Orthogonal amplitude modulation system transmitter
JPS6284642A (en) * 1985-10-09 1987-04-18 Fujitsu Ltd Measurement system for number of modulation units

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014557A (en) * 1983-07-06 1985-01-25 Nec Corp Orthogonal amplitude modulation system transmitter
JPS6284642A (en) * 1985-10-09 1987-04-18 Fujitsu Ltd Measurement system for number of modulation units

Also Published As

Publication number Publication date
JPS6324343B2 (en) 1988-05-20

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