JPS57116436A - Demodulator - Google Patents

Demodulator

Info

Publication number
JPS57116436A
JPS57116436A JP56002150A JP215081A JPS57116436A JP S57116436 A JPS57116436 A JP S57116436A JP 56002150 A JP56002150 A JP 56002150A JP 215081 A JP215081 A JP 215081A JP S57116436 A JPS57116436 A JP S57116436A
Authority
JP
Japan
Prior art keywords
control
circuit
gain
signal
phase
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
JP56002150A
Other languages
Japanese (ja)
Other versions
JPS6352817B2 (en
Inventor
Shoichi Mizoguchi
Toshihiko Ryu
Toshitake Noguchi
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP56002150A priority Critical patent/JPS57116436A/en
Publication of JPS57116436A publication Critical patent/JPS57116436A/en
Publication of JPS6352817B2 publication Critical patent/JPS6352817B2/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
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3809—Amplitude regulation arrangements

Landscapes

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

Abstract

PURPOSE:To improve the quality of a received signal by improving the stability by operation to phase follow-up operation by exercising automatic gain control by a variable gain circuit while obtaining follow-up characteristics for phase rotation by a carrier synchronous loop. CONSTITUTION:An input orthogonal amplitude-modulated signal is passed through a variable gain circuit 148 and demodulated by phase demodulation parts 127 and 128, whose demodulated signals are supplied to discriminating and regenerating circuits 145 and 146 through a transversal equalizer 130, thereby obtaining regenerated data. The regenerated data is supplied to a control-signal generating circuit 147; part of its output control signal controls the variable attenuating circuit groups 133-136, and 139-141 of the equalizer 130, and the other control signal is applied to a VCO129 to form a carrier-wave synchronous loop and to further control the gain of the gain circuit 148.
JP56002150A 1981-01-12 1981-01-12 Demodulator Granted JPS57116436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56002150A JPS57116436A (en) 1981-01-12 1981-01-12 Demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56002150A JPS57116436A (en) 1981-01-12 1981-01-12 Demodulator

Publications (2)

Publication Number Publication Date
JPS57116436A true JPS57116436A (en) 1982-07-20
JPS6352817B2 JPS6352817B2 (en) 1988-10-20

Family

ID=11521319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56002150A Granted JPS57116436A (en) 1981-01-12 1981-01-12 Demodulator

Country Status (1)

Country Link
JP (1) JPS57116436A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59127433A (en) * 1983-01-12 1984-07-23 Nec Corp Adaptive receiver
JPS6212219A (en) * 1985-07-09 1987-01-21 Nec Corp Demodulation system
JPS62232223A (en) * 1986-03-25 1987-10-12 シーメンス・テレコムニカツイオーニ・ソチエタ・ペル・アチオニ Method and apparatus for equalizing adaptable blind

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59127433A (en) * 1983-01-12 1984-07-23 Nec Corp Adaptive receiver
JPS6212219A (en) * 1985-07-09 1987-01-21 Nec Corp Demodulation system
JPS62232223A (en) * 1986-03-25 1987-10-12 シーメンス・テレコムニカツイオーニ・ソチエタ・ペル・アチオニ Method and apparatus for equalizing adaptable blind

Also Published As

Publication number Publication date
JPS6352817B2 (en) 1988-10-20

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