CA2136887A1 - High Speed Quantization-Level-Sampling Modem with Equalization Arrangement - Google Patents

High Speed Quantization-Level-Sampling Modem with Equalization Arrangement

Info

Publication number
CA2136887A1
CA2136887A1 CA2136887A CA2136887A CA2136887A1 CA 2136887 A1 CA2136887 A1 CA 2136887A1 CA 2136887 A CA2136887 A CA 2136887A CA 2136887 A CA2136887 A CA 2136887A CA 2136887 A1 CA2136887 A1 CA 2136887A1
Authority
CA
Canada
Prior art keywords
modem
qls
level
telephone system
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.)
Granted
Application number
CA2136887A
Other languages
French (fr)
Other versions
CA2136887C (en
Inventor
Ender Ayanoglu
Glenn David Golden
Raymond K. Jones
James Emery Mazo
David Goodwin Shaw
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2136887A1 publication Critical patent/CA2136887A1/en
Application granted granted Critical
Publication of CA2136887C publication Critical patent/CA2136887C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The present invention is a quantization-level-sampling (QLS) modem which includes means for separately equalizing each loop of an end-to-end digital telephone system network connection by employing a plurality of transmitter filters and a plurality of receiver filters in such a way that, in the direction of transmission from modem to central office, the voltage samples seen by the coder/decoder stations are equivalent to the network quantization levels transmitted by the modem, and in the direction of transmission from central office to modem, the voltage samples seen by the modem are equivalent to the network quantization levels encoded by the coder/decoder stations. The invention also includes a QLS
modem communications system which includes the aforesaid digital telephone system network and a plurality of QLS
modems. In preferred embodiments, an adaptation service unit within the telephone system network assists in the determination of the settings of the transmitter and receiver filters.
CA002136887A 1994-01-03 1994-11-29 High speed quantization-level-sampling modem with equalization arrangement Expired - Lifetime CA2136887C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US176,742 1994-01-03
US08/176,742 US5528625A (en) 1994-01-03 1994-01-03 High speed quantization-level-sampling modem with equalization arrangement

Publications (2)

Publication Number Publication Date
CA2136887A1 true CA2136887A1 (en) 1995-07-04
CA2136887C CA2136887C (en) 1998-12-29

Family

ID=22645651

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002136887A Expired - Lifetime CA2136887C (en) 1994-01-03 1994-11-29 High speed quantization-level-sampling modem with equalization arrangement

Country Status (5)

Country Link
US (1) US5528625A (en)
EP (1) EP0669740B1 (en)
JP (1) JP3172382B2 (en)
CA (1) CA2136887C (en)
DE (1) DE69427577T2 (en)

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Also Published As

Publication number Publication date
EP0669740B1 (en) 2001-06-27
DE69427577D1 (en) 2001-08-02
DE69427577T2 (en) 2002-05-29
JP3172382B2 (en) 2001-06-04
CA2136887C (en) 1998-12-29
EP0669740A2 (en) 1995-08-30
US5528625A (en) 1996-06-18
EP0669740A3 (en) 1998-03-18
JPH07226719A (en) 1995-08-22

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Effective date: 20141201