GB2007943A - A digital regenerator having improved noise immunity - Google Patents

A digital regenerator having improved noise immunity

Info

Publication number
GB2007943A
GB2007943A GB7840837A GB7840837A GB2007943A GB 2007943 A GB2007943 A GB 2007943A GB 7840837 A GB7840837 A GB 7840837A GB 7840837 A GB7840837 A GB 7840837A GB 2007943 A GB2007943 A GB 2007943A
Authority
GB
United Kingdom
Prior art keywords
signal
filter
noise
partial
noise immunity
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
GB7840837A
Other versions
GB2007943B (en
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of GB2007943A publication Critical patent/GB2007943A/en
Application granted granted Critical
Publication of GB2007943B publication Critical patent/GB2007943B/en
Expired 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
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/24—Relay circuits using discharge tubes or semiconductor devices
    • H04L25/242—Relay circuits using discharge tubes or semiconductor devices with retiming
    • 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
    • H04L25/497—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 by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Dc Digital Transmission (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Optical Communication System (AREA)

Abstract

A digital signal regenerator for partial-response signals accompanied by crosstalk or other noise having an amplitude varying with frequency is preceded by a band limiting filter which transforms the signal to a form having increased intersymbol interference and the same or fewer levels and which reduces the total power of the noise. The thus regenerated signal may be detected or passed to a second filter having an inverse transfer function which replicates the partial-response signal at its output so as to form a repeater which appears transparent. The filters may be of the type which combine the signal with a version thereof delayed by once or twice the repetition period. Duo binary signals may be converted to bipolar form in the filter and means are described for correcting code violations produced.
GB7840837A 1977-11-02 1978-10-17 Digital regenerator having noise immunity Expired GB2007943B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA290,075A CA1078929A (en) 1977-11-02 1977-11-02 Digital regenerator having improved noise immunity

Publications (2)

Publication Number Publication Date
GB2007943A true GB2007943A (en) 1979-05-23
GB2007943B GB2007943B (en) 1982-03-24

Family

ID=4109928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7840837A Expired GB2007943B (en) 1977-11-02 1978-10-17 Digital regenerator having noise immunity

Country Status (6)

Country Link
JP (1) JPS5472610A (en)
CA (1) CA1078929A (en)
DE (1) DE2847646A1 (en)
FR (1) FR2408250A1 (en)
GB (1) GB2007943B (en)
SE (1) SE7811332L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468182A1 (en) * 1979-10-17 1981-04-30 Hitachi Electronics METHOD AND APPARATUS FOR THE RECORDING AND MAGNETIC REPRODUCTION OF DIGITAL SIGNALS
FR2633790A1 (en) * 1988-07-01 1990-01-05 Labo Electronique Physique Device for receiving frequency-modulated digitally coded signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468182A1 (en) * 1979-10-17 1981-04-30 Hitachi Electronics METHOD AND APPARATUS FOR THE RECORDING AND MAGNETIC REPRODUCTION OF DIGITAL SIGNALS
FR2633790A1 (en) * 1988-07-01 1990-01-05 Labo Electronique Physique Device for receiving frequency-modulated digitally coded signals

Also Published As

Publication number Publication date
GB2007943B (en) 1982-03-24
JPS5472610A (en) 1979-06-11
DE2847646A1 (en) 1979-05-03
SE7811332L (en) 1979-05-03
CA1078929A (en) 1980-06-03
FR2408250A1 (en) 1979-06-01

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Legal Events

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