JPS57170653A - Demodulating equipment - Google Patents

Demodulating equipment

Info

Publication number
JPS57170653A
JPS57170653A JP56055295A JP5529581A JPS57170653A JP S57170653 A JPS57170653 A JP S57170653A JP 56055295 A JP56055295 A JP 56055295A JP 5529581 A JP5529581 A JP 5529581A JP S57170653 A JPS57170653 A JP S57170653A
Authority
JP
Japan
Prior art keywords
added
phase error
equalizing
phase
section
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
JP56055295A
Other languages
Japanese (ja)
Inventor
Masaharu Araki
Takehiro Murase
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56055295A priority Critical patent/JPS57170653A/en
Publication of JPS57170653A publication Critical patent/JPS57170653A/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

Abstract

PURPOSE:To stabilize phase error control in demodulating equipment of orthogonal modulated waves by checking the center tap output of delay element to which interference waves of orthogonal component are supplied. CONSTITUTION:An orthogonal modulated wave signal is added to phase detectors 12, 13 and the detection output is added to phase is added to a transversal type automatic equalizer 23. The equalizing output of the eaualizing section 24 is added to a discriminating section and a controlling section 25 and demodulated. At the same time, it is added to a phase error signal generating circuit 16 and a phase error signal is added to a voltage control oscillator 14 through a low-pass filter 17. The output of the oscillator 14 is added to phase detectors 12, 13 as a regenerative carrier wave. The equalizing section 24 includes a series circuit of a delay circuit, and the center tap of the series circuit to which interference waves of orthogonal component are supplied is omitted and equalizing ability for phase error is removed. Equalizing for phase error is made by controlling the voltage control oscillator 14 by the phase error signal generating circuit 16.
JP56055295A 1981-04-13 1981-04-13 Demodulating equipment Pending JPS57170653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56055295A JPS57170653A (en) 1981-04-13 1981-04-13 Demodulating equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56055295A JPS57170653A (en) 1981-04-13 1981-04-13 Demodulating equipment

Publications (1)

Publication Number Publication Date
JPS57170653A true JPS57170653A (en) 1982-10-20

Family

ID=12994576

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56055295A Pending JPS57170653A (en) 1981-04-13 1981-04-13 Demodulating equipment

Country Status (1)

Country Link
JP (1) JPS57170653A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173948A (en) * 1984-02-20 1985-09-07 Nec Corp Jitter canceller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173948A (en) * 1984-02-20 1985-09-07 Nec Corp Jitter canceller

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