DE3689746D1 - Aufnahme- und Wiedergabevorrichtung unter Verwendung eines Modulators/Demodulators mit verschobener quaternärer Phasendifferenzumtastung. - Google Patents

Aufnahme- und Wiedergabevorrichtung unter Verwendung eines Modulators/Demodulators mit verschobener quaternärer Phasendifferenzumtastung.

Info

Publication number
DE3689746D1
DE3689746D1 DE86108197T DE3689746T DE3689746D1 DE 3689746 D1 DE3689746 D1 DE 3689746D1 DE 86108197 T DE86108197 T DE 86108197T DE 3689746 T DE3689746 T DE 3689746T DE 3689746 D1 DE3689746 D1 DE 3689746D1
Authority
DE
Germany
Prior art keywords
demodulator
modulator
shifted
recording
phase difference
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.)
Expired - Fee Related
Application number
DE86108197T
Other languages
English (en)
Other versions
DE3689746T2 (de
Inventor
Nobutaka Amada
Takaharu Noguchi
Hiroyuki Kimura
Masaharu Kobayashi
Takao Arai
Yasufumi Yumde
Kuniaki Miura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Priority claimed from JP60134057A external-priority patent/JPH0754610B2/ja
Priority claimed from JP60134054A external-priority patent/JPS61294954A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of DE3689746D1 publication Critical patent/DE3689746D1/de
Application granted granted Critical
Publication of DE3689746T2 publication Critical patent/DE3689746T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
    • 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
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2078—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the phase change per symbol period is constrained
    • H04L27/2082—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the phase change per symbol period is constrained for offset or staggered quadrature phase shift keying
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
DE3689746T 1985-06-21 1986-06-16 Aufnahme- und Wiedergabevorrichtung unter Verwendung eines Modulators/Demodulators mit verschobener quaternärer Phasendifferenzumtastung. Expired - Fee Related DE3689746T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60134057A JPH0754610B2 (ja) 1985-06-21 1985-06-21 Ｐｃｍ記録方法，記録装置および記録再生装置
JP60134054A JPS61294954A (ja) 1985-06-21 1985-06-21 オフセツト４相差動ｐｓｋ変復調装置

Publications (2)

Publication Number Publication Date
DE3689746D1 true DE3689746D1 (de) 1994-05-05
DE3689746T2 DE3689746T2 (de) 1994-09-22

Family

ID=26468237

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3689746T Expired - Fee Related DE3689746T2 (de) 1985-06-21 1986-06-16 Aufnahme- und Wiedergabevorrichtung unter Verwendung eines Modulators/Demodulators mit verschobener quaternärer Phasendifferenzumtastung.

Country Status (3)

Country Link
EP (1) EP0206203B1 (de)
KR (1) KR900007030B1 (de)
DE (1) DE3689746T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930007937B1 (ko) * 1988-03-28 1993-08-21 마쯔시다덴기산교 가부시기가이샤 디지틀신호 자기기록 재생장치
KR100261226B1 (ko) * 1992-10-29 2000-07-01 윤종용 파이/4 차분 직교위상 변조신호의 기저대역 차분 검파기
JP2003123391A (ja) * 2001-10-10 2003-04-25 Hitachi Ltd 情報記録再生装置用信号処理装置及び信号処理方法
RU2451413C2 (ru) * 2007-03-09 2012-05-20 Квэлкомм Инкорпорейтед Поворотная обучающая последовательность квадратурной модуляции
US8290083B2 (en) 2007-03-09 2012-10-16 Qualcomm Incorporated Quadrature imbalance mitigation using unbiased training sequences
US8428175B2 (en) 2007-03-09 2013-04-23 Qualcomm Incorporated Quadrature modulation rotating training sequence
US8064550B2 (en) 2007-03-09 2011-11-22 Qualcomm, Incorporated Quadrature imbalance estimation using unbiased training sequences

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092491A (en) * 1977-04-04 1978-05-30 Bell Telephone Laboratories, Incorporated Differential encoding and decoding scheme for digital transmission systems
US4501002A (en) * 1983-02-28 1985-02-19 Auchterlonie Richard C Offset QPSK demodulator and receiver
US4679097A (en) * 1983-11-30 1987-07-07 Matsushita Electric Industrial Co., Ltd. Method of recording and reproducing video and audio signals on a magnetic tape

Also Published As

Publication number Publication date
EP0206203A2 (de) 1986-12-30
KR870000799A (ko) 1987-02-20
EP0206203A3 (en) 1988-11-23
EP0206203B1 (de) 1994-03-30
KR900007030B1 (ko) 1990-09-27
DE3689746T2 (de) 1994-09-22

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee