SE0000264D0 - Method and apparatus for signal filtration - Google Patents

Method and apparatus for signal filtration

Info

Publication number
SE0000264D0
SE0000264D0 SE0000264A SE0000264A SE0000264D0 SE 0000264 D0 SE0000264 D0 SE 0000264D0 SE 0000264 A SE0000264 A SE 0000264A SE 0000264 A SE0000264 A SE 0000264A SE 0000264 D0 SE0000264 D0 SE 0000264D0
Authority
SE
Sweden
Prior art keywords
filter
impedance
complex
transmission line
passive
Prior art date
Application number
SE0000264A
Other languages
Swedish (sv)
Other versions
SE518713C2 (en
SE0000264L (en
Inventor
Bengt Gustav Loefmark
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE0000264A priority Critical patent/SE518713C2/en
Publication of SE0000264D0 publication Critical patent/SE0000264D0/en
Priority to PCT/SE2001/000026 priority patent/WO2001056150A1/en
Priority to EP01902884A priority patent/EP1252711A1/en
Priority to AU2001230650A priority patent/AU2001230650A1/en
Priority to US09/768,217 priority patent/US7447305B2/en
Publication of SE0000264L publication Critical patent/SE0000264L/en
Publication of SE518713C2 publication Critical patent/SE518713C2/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/24—Frequency-independent attenuators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03878—Line equalisers; line build-out devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters And Equalizers (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

The present invention relates to a filter (45) for filtering signals in a telecommunications system, a method of designing said filter, and a corresponding splitter filter. The inventive filter (45) is characterised in that it is passive and has a complex impedance which gives good impedance matching to the complex impedance of a transmission line. Because the filter is passive, it does not need to be powered and can thus be placed in locations that lack a power supply. The filter will also function in the event of a power failure. Because the filter has an impedance which can be well matched to the complex impedance of a transmission line, problems relating to echo and side tones can be minimised. The design of the inventive filter has been made possible by utilising that a certain determined level of losses can often be accepted in respect of the filter. The impedance of the filter can be made similar to the impedance of a transmission line, by intentionally introducing into the filter losses (15, 17) which assist in making the impedance of the filter more complex. This can be achieved without the use of active elements.
SE0000264A 2000-01-27 2000-01-27 Method and apparatus for signal filtration consisting of a passive filter with complex impedance SE518713C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE0000264A SE518713C2 (en) 2000-01-27 2000-01-27 Method and apparatus for signal filtration consisting of a passive filter with complex impedance
PCT/SE2001/000026 WO2001056150A1 (en) 2000-01-27 2001-01-09 Method and arrangement for signal filtering
EP01902884A EP1252711A1 (en) 2000-01-27 2001-01-09 Method and arrangement for signal filtering
AU2001230650A AU2001230650A1 (en) 2000-01-27 2001-01-09 Method and arrangement for signal filtering
US09/768,217 US7447305B2 (en) 2000-01-27 2001-01-24 Method and arrangement for filtering of signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0000264A SE518713C2 (en) 2000-01-27 2000-01-27 Method and apparatus for signal filtration consisting of a passive filter with complex impedance

Publications (3)

Publication Number Publication Date
SE0000264D0 true SE0000264D0 (en) 2000-01-27
SE0000264L SE0000264L (en) 2001-07-28
SE518713C2 SE518713C2 (en) 2002-11-12

Family

ID=20278251

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0000264A SE518713C2 (en) 2000-01-27 2000-01-27 Method and apparatus for signal filtration consisting of a passive filter with complex impedance

Country Status (4)

Country Link
EP (1) EP1252711A1 (en)
AU (1) AU2001230650A1 (en)
SE (1) SE518713C2 (en)
WO (1) WO2001056150A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982426A (en) * 1989-01-19 1991-01-01 Northern Telecom Limited Telecommunications line interface circuits
GB9726037D0 (en) * 1997-12-09 1998-02-04 Northern Telecom Ltd Communications signal splitter
EP0942578A3 (en) * 1998-03-12 2002-01-30 Westell Technologies, Inc. Dual-mode filter for ADSL
FI981319A (en) * 1998-06-10 1999-12-11 Nokia Networks Oy Separation of narrowband and broadband services on a transmission connection
DE19851872C2 (en) * 1998-11-10 2001-02-22 Vacuumschmelze Gmbh Low pass filter for an ADSL crossover

Also Published As

Publication number Publication date
EP1252711A1 (en) 2002-10-30
AU2001230650A1 (en) 2001-08-07
SE518713C2 (en) 2002-11-12
WO2001056150A1 (en) 2001-08-02
SE0000264L (en) 2001-07-28

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Legal Events

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