GB2337433B - A method and apparatus for shaping the signal spectrum of transmit signal of a modem - Google Patents

A method and apparatus for shaping the signal spectrum of transmit signal of a modem

Info

Publication number
GB2337433B
GB2337433B GB9920892A GB9920892A GB2337433B GB 2337433 B GB2337433 B GB 2337433B GB 9920892 A GB9920892 A GB 9920892A GB 9920892 A GB9920892 A GB 9920892A GB 2337433 B GB2337433 B GB 2337433B
Authority
GB
United Kingdom
Prior art keywords
signal
modem
shaping
spectrum
transmit signal
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
GB9920892A
Other versions
GB2337433A (en
GB9920892D0 (en
Inventor
Michael Joseph Mclaughlin
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.)
Fernway Ltd
Original Assignee
Fernway 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 Fernway Ltd filed Critical Fernway Ltd
Publication of GB9920892D0 publication Critical patent/GB9920892D0/en
Publication of GB2337433A publication Critical patent/GB2337433A/en
Application granted granted Critical
Publication of GB2337433B publication Critical patent/GB2337433B/en
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
    • 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)
GB9920892A 1997-03-05 1998-03-05 A method and apparatus for shaping the signal spectrum of transmit signal of a modem Expired - Fee Related GB2337433B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE970152 1997-03-05
PCT/IE1998/000020 WO1998039888A2 (en) 1997-03-05 1998-03-05 A method and apparatus for shaping the signal spectrum of a transmit signal of a modem

Publications (3)

Publication Number Publication Date
GB9920892D0 GB9920892D0 (en) 1999-11-10
GB2337433A GB2337433A (en) 1999-11-17
GB2337433B true GB2337433B (en) 2002-03-06

Family

ID=11041399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9920892A Expired - Fee Related GB2337433B (en) 1997-03-05 1998-03-05 A method and apparatus for shaping the signal spectrum of transmit signal of a modem

Country Status (4)

Country Link
AU (1) AU6417098A (en)
GB (1) GB2337433B (en)
IE (1) IES980160A2 (en)
WO (1) WO1998039888A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209902A2 (en) * 1985-07-24 1987-01-28 Nec Corporation Multilevel modulator comprising a compact error correcting code producing unit
US5249200A (en) * 1991-07-30 1993-09-28 Codex Corporation Device and method for combining precoding with symbol-rate spectral shaping
US5291521A (en) * 1990-05-29 1994-03-01 At&T Bell Laboratories Index assignment in redundancy-coded data communication systems
US5455839A (en) * 1991-12-27 1995-10-03 Motorola, Inc. Device and method for precoding
EP0863642A2 (en) * 1997-03-03 1998-09-09 PC-Tel, Inc. Shaping code for PCM modems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209902A2 (en) * 1985-07-24 1987-01-28 Nec Corporation Multilevel modulator comprising a compact error correcting code producing unit
US5291521A (en) * 1990-05-29 1994-03-01 At&T Bell Laboratories Index assignment in redundancy-coded data communication systems
US5249200A (en) * 1991-07-30 1993-09-28 Codex Corporation Device and method for combining precoding with symbol-rate spectral shaping
US5455839A (en) * 1991-12-27 1995-10-03 Motorola, Inc. Device and method for precoding
EP0863642A2 (en) * 1997-03-03 1998-09-09 PC-Tel, Inc. Shaping code for PCM modems

Also Published As

Publication number Publication date
AU6417098A (en) 1998-09-22
IES80431B2 (en) 1998-07-01
GB2337433A (en) 1999-11-17
WO1998039888A3 (en) 1998-12-03
WO1998039888A2 (en) 1998-09-11
GB9920892D0 (en) 1999-11-10
IES980160A2 (en) 1998-07-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050305