JPS55100775A - Digital four-stable-point phase detector - Google Patents

Digital four-stable-point phase detector

Info

Publication number
JPS55100775A
JPS55100775A JP858679A JP858679A JPS55100775A JP S55100775 A JPS55100775 A JP S55100775A JP 858679 A JP858679 A JP 858679A JP 858679 A JP858679 A JP 858679A JP S55100775 A JPS55100775 A JP S55100775A
Authority
JP
Japan
Prior art keywords
phase
circuits
low
stable
exclusive
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
JP858679A
Other languages
Japanese (ja)
Other versions
JPS6360580B2 (en
Inventor
Junji Namiki
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.)
NEC Corp
NTT Inc
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP858679A priority Critical patent/JPS55100775A/en
Publication of JPS55100775A publication Critical patent/JPS55100775A/en
Publication of JPS6360580B2 publication Critical patent/JPS6360580B2/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
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier

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 manufacture by composing a four-stable-point phase detector, used for phase control over a needed regenerated carrier, of a digital element when carrying the synchronous detection of a four-phase modulated wave into effect. CONSTITUTION:An input signal with four phase changes is applied from input terminal 106 and two output signal differing in phase by 90 degrees are supplied from oscillator 19 composed of oscillation circuit 17 and pi/2 phase shift circuit; and they are processed by exclusive-OR circuits 1 and 2, decision circuits 11 and 12, exclusive-OR circuits 3, 6 and 7, and NAND circuits 8-10 and an output from output terminal 101 is supplied to a low-pass filter to extract its low-frequency component. This low-frequency component has phase detection characteristics crossing lateral axis thetae four times at a positive gradient within 2pi radians needed for carrier phase control over a four-phase modulated wave.
JP858679A 1979-01-26 1979-01-26 Digital four-stable-point phase detector Granted JPS55100775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP858679A JPS55100775A (en) 1979-01-26 1979-01-26 Digital four-stable-point phase detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP858679A JPS55100775A (en) 1979-01-26 1979-01-26 Digital four-stable-point phase detector

Publications (2)

Publication Number Publication Date
JPS55100775A true JPS55100775A (en) 1980-07-31
JPS6360580B2 JPS6360580B2 (en) 1988-11-24

Family

ID=11697094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP858679A Granted JPS55100775A (en) 1979-01-26 1979-01-26 Digital four-stable-point phase detector

Country Status (1)

Country Link
JP (1) JPS55100775A (en)

Also Published As

Publication number Publication date
JPS6360580B2 (en) 1988-11-24

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