CA2029749A1 - Systeme de detection de signaux de modem pour codec a mic differentielle adaptative - Google Patents

Systeme de detection de signaux de modem pour codec a mic differentielle adaptative

Info

Publication number
CA2029749A1
CA2029749A1 CA2029749A CA2029749A CA2029749A1 CA 2029749 A1 CA2029749 A1 CA 2029749A1 CA 2029749 A CA2029749 A CA 2029749A CA 2029749 A CA2029749 A CA 2029749A CA 2029749 A1 CA2029749 A1 CA 2029749A1
Authority
CA
Canada
Prior art keywords
modem
signal
detecting system
adaptive differential
signal detecting
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
CA2029749A
Other languages
English (en)
Other versions
CA2029749C (fr
Inventor
Keizo Sakamoto
Yoshihiro Tomita
Hironori Orihara
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
Publication of CA2029749A1 publication Critical patent/CA2029749A1/fr
Application granted granted Critical
Publication of CA2029749C publication Critical patent/CA2029749C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
CA002029749A 1989-11-16 1990-11-13 Systeme de detection de signaux de modem pour codec a mic differentielle adaptative Expired - Fee Related CA2029749C (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP1-297830 1989-11-16
JP29783089 1989-11-16
JP2-36229 1990-02-19
JP3622990 1990-02-19
JP2-92610 1990-04-06
JP9261090 1990-04-06
JP14906390 1990-06-07
JP2-149063 1990-06-07

Publications (2)

Publication Number Publication Date
CA2029749A1 true CA2029749A1 (fr) 1991-05-17
CA2029749C CA2029749C (fr) 1994-09-06

Family

ID=27460231

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002029749A Expired - Fee Related CA2029749C (fr) 1989-11-16 1990-11-13 Systeme de detection de signaux de modem pour codec a mic differentielle adaptative

Country Status (2)

Country Link
US (1) US5202905A (fr)
CA (1) CA2029749C (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04348621A (ja) * 1991-05-27 1992-12-03 Canon Inc トレーニング検出装置
FI93914C (fi) * 1993-08-27 1995-06-12 Nokia Telecommunications Oy Menetelmä modeemiyhteyden ohjaamiseksi häiriötilanteessa
FR2714558B1 (fr) * 1993-12-23 1996-03-15 Sgs Thomson Microelectronics Circuit de reconnaissance d'une séquence de mots dans un modem.
USRE38391E1 (en) 1993-12-23 2004-01-20 Stmicroelectronics S.A. Circuit for detecting word sequences in a modem
US5446771A (en) * 1994-01-24 1995-08-29 Motorola, Inc. Adaptive coherent signal detection method and apparatus
US6111922A (en) * 1994-12-20 2000-08-29 Sgs-Thomson Microelectronics S.A. Circuit for detecting word sequences in a modem
US5787116A (en) * 1996-06-18 1998-07-28 Motorola Inc. Apparatus and method for detecting amplitude modulated answer back toned signals
US6195702B1 (en) * 1997-12-01 2001-02-27 Advanced Micro Devices, Inc. Modem for maintaining connection during loss of controller synchronism
US6163570A (en) * 1998-05-11 2000-12-19 Conexant Systems, Inc. Methods and apparatus for verifying transmit power levels in a signal point limited transmission system
US6418160B1 (en) * 2000-03-29 2002-07-09 Sbc Technology Resources, Inc. Method for testing a communication channel
FR2809553B1 (fr) * 2000-05-23 2002-08-30 St Microelectronics Sa Circuit pour echanger des communications par une ligne de transmission
US7620154B2 (en) * 2002-12-23 2009-11-17 Cambron G Keith Equivalent working length determinative system for digital subscriber line circuits

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479599A (en) * 1967-04-05 1969-11-18 Us Navy Signal sensitive depressed threshold detector
FR2462073A1 (fr) * 1979-07-17 1981-02-06 Thomson Csf Procede et dispositif pour l'extraction de donnees numeriques en presence de bruit et de distorsions
FR2496363A1 (fr) * 1980-12-12 1982-06-18 Cit Alcatel Procede et dispositif de detection de la sequence d'apprentissage d'un egaliseur auto-adaptatif
US4606045A (en) * 1982-08-02 1986-08-12 Trw Inc. Method and apparatus for detecting an equalizer training period in a receiving-end modem
CA1288867C (fr) * 1985-06-20 1991-09-10 Tomoyoshi Takebayashi Systeme de modulation differentielle adaptative par impulsions et codage
EP0212030B1 (fr) * 1985-08-02 1991-03-20 International Business Machines Corporation Dispositif de détection de fin d'energie d'un signal de données
US4956851A (en) * 1988-05-25 1990-09-11 Case Communications Inc. Modem with remote speed-change capability

Also Published As

Publication number Publication date
CA2029749C (fr) 1994-09-06
US5202905A (en) 1993-04-13

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed