CA2267362A1 - Dispositif, systeme et procede pour former le spectre des signaux de donnees emis - Google Patents

Dispositif, systeme et procede pour former le spectre des signaux de donnees emis Download PDF

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Publication number
CA2267362A1
CA2267362A1 CA002267362A CA2267362A CA2267362A1 CA 2267362 A1 CA2267362 A1 CA 2267362A1 CA 002267362 A CA002267362 A CA 002267362A CA 2267362 A CA2267362 A CA 2267362A CA 2267362 A1 CA2267362 A1 CA 2267362A1
Authority
CA
Canada
Prior art keywords
levels
level
transmitted
octets
digital network
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.)
Abandoned
Application number
CA002267362A
Other languages
English (en)
Inventor
Pierre A. Humblet
M. Vedat Eyuboglu
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.)
Motorola Solutions Inc
Original Assignee
Individual
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 US08/747,840 external-priority patent/US5818879A/en
Application filed by Individual filed Critical Individual
Publication of CA2267362A1 publication Critical patent/CA2267362A1/fr
Abandoned legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4927—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using levels matched to the quantisation levels of the channel

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)

Abstract

Emetteur (56) pour émettre une séquence d'octets, dans un réseau numérique. Ce réseau convertit les octets en une séquence de niveaux. L'émetteur comprend: un dispositif de recherche de correspondance (74) qui produit pour chaque groupe de bits utiles une classe d'équivalence d'un ou de plusieurs niveaux; un sélecteur de niveau (76) pour sélectionner dans la classe d'équivalence le niveau qui représentera le groupe de bits utiles devant être émis; un dispositif filtre (78) qui reçoit à l'entrée les niveaux sélectionnés précédemment et adresse sa sortie au sélecteur de niveaux, lequel (76) sélectionne le niveau (76) d'émission en fonction de la sortie du dispositif filtre (78); et un convertisseur d'octets (80) qui reçoit le niveau sélectionné à l'entrée et transmet sur le réseau numérique un octet correspondant au niveau sélectionné de façon à produire le signal analogique qui a la forme spectrale prédéfinie lorsque les octets transmis sont convertis en niveaux dans le réseau numérique.
CA002267362A 1996-09-25 1997-09-19 Dispositif, systeme et procede pour former le spectre des signaux de donnees emis Abandoned CA2267362A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US2668896P 1996-09-25 1996-09-25
US60/026,688 1996-09-25
US73043496A 1996-10-15 1996-10-15
US08/730,434 1996-10-15
US08/747,840 1996-11-13
US08/747,840 US5818879A (en) 1996-10-15 1996-11-13 Device, system and method for spectrally shaping transmitted data signals
PCT/US1997/016936 WO1998013977A1 (fr) 1996-09-25 1997-09-19 Dispositif, systeme et procede pour former le spectre des signaux de donnees emis

Publications (1)

Publication Number Publication Date
CA2267362A1 true CA2267362A1 (fr) 1998-04-02

Family

ID=27362825

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002267362A Abandoned CA2267362A1 (fr) 1996-09-25 1997-09-19 Dispositif, systeme et procede pour former le spectre des signaux de donnees emis

Country Status (5)

Country Link
EP (1) EP0927481A4 (fr)
CN (1) CN1231789A (fr)
AU (1) AU4649397A (fr)
CA (1) CA2267362A1 (fr)
WO (1) WO1998013977A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926505A (en) * 1996-10-16 1999-07-20 Cirrus Logic, Inc. Device, system, and method for modem communication utilizing two-step mapping
US6222890B1 (en) * 1997-04-08 2001-04-24 Vocal Technologies, Ltd. Variable spectral shaping method for PCM modems
US6480549B1 (en) 1997-04-08 2002-11-12 Vocal Technologies, Ltd. Method for determining attenuation in a digital PCM channel
US6643270B1 (en) 1998-03-03 2003-11-04 Vocal Technologies, Ltd Method of compensating for systemic impairments in a telecommunications network
US6414989B1 (en) 1999-09-10 2002-07-02 Conexant Systems, Inc. Upstream PCM transmission for a modem system
US6418170B1 (en) * 2000-02-07 2002-07-09 Motorola, Inc. Method and apparatus for achieving 180° phase invariant transmission in a PCM modem system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5040191A (en) * 1987-02-24 1991-08-13 Codex Corporation Partial response channel signaling systems
DE69532919T2 (de) * 1994-12-09 2005-04-14 Townshend, Brent, Menlo Park Schnelles vermittlungssystem für analoge teilnehmeranschlüsse
US5659579A (en) * 1995-02-01 1997-08-19 Lucent Technologies Inc. Multilevel coding for fractional bits

Also Published As

Publication number Publication date
EP0927481A4 (fr) 2003-04-23
CN1231789A (zh) 1999-10-13
EP0927481A1 (fr) 1999-07-07
WO1998013977A1 (fr) 1998-04-02
AU4649397A (en) 1998-04-17

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Legal Events

Date Code Title Description
EEER Examination request
FZDE Discontinued