AU584020B2 - A test device for digital echo compensators - Google Patents

A test device for digital echo compensators

Info

Publication number
AU584020B2
AU584020B2 AU19111/88A AU1911188A AU584020B2 AU 584020 B2 AU584020 B2 AU 584020B2 AU 19111/88 A AU19111/88 A AU 19111/88A AU 1911188 A AU1911188 A AU 1911188A AU 584020 B2 AU584020 B2 AU 584020B2
Authority
AU
Australia
Prior art keywords
amplitude
values
test device
transmission path
test apparatus
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.)
Ceased
Application number
AU19111/88A
Other versions
AU1911188A (en
Inventor
Frank Kuhn
Dirsko V. Pfeil
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of AU1911188A publication Critical patent/AU1911188A/en
Application granted granted Critical
Publication of AU584020B2 publication Critical patent/AU584020B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/493—Testing echo effects or singing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/238—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using initial training sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The test apparatus (14) contains an amplitude generator (17), which generates 7-bit amplitude values for the transmission path input and the receiving path of the echo canceller (2). A quasi-random generator (16) supplies random sign bits to these values, and a delay component (15) simulates a transit delay. An amplitude value monitoring device (18) checks whether the amplitude value at the transmission path output has decayed to a residual value after a defined period from the time when the 7-bit amplitude values were applied. This test apparatus is used to test echo cancellers in international gateway exchanges. <IMAGE>
AU19111/88A 1987-07-16 1988-07-15 A test device for digital echo compensators Ceased AU584020B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3723569 1987-07-16
DE3723569 1987-07-16

Publications (2)

Publication Number Publication Date
AU1911188A AU1911188A (en) 1989-02-02
AU584020B2 true AU584020B2 (en) 1989-05-11

Family

ID=6331725

Family Applications (1)

Application Number Title Priority Date Filing Date
AU19111/88A Ceased AU584020B2 (en) 1987-07-16 1988-07-15 A test device for digital echo compensators

Country Status (8)

Country Link
EP (1) EP0300352B1 (en)
JP (1) JPH0748680B2 (en)
AT (1) ATE83344T1 (en)
AU (1) AU584020B2 (en)
DE (1) DE3876523D1 (en)
ES (1) ES2037147T3 (en)
GR (1) GR3007224T3 (en)
NO (1) NO300520B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3908284C1 (en) * 1989-03-14 1990-06-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De Test device for checking the cancelling function of a digital echo canceller
DE19960051A1 (en) 1999-12-14 2001-06-21 Alcatel Sa Method for echo cancellation in a telecommunications system and echo cancellation device for carrying out the method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5514380A (en) * 1979-02-05 1980-08-14 T.R.T. Testing echo cancellor
EP0014506A1 (en) * 1979-02-02 1980-08-20 R.T.C. LA RADIOTECHNIQUE-COMPELEC Société anonyme dite: Low-pass filter for low-frequency signals
AU4056285A (en) * 1984-03-30 1985-10-03 Siemens Aktiengesellschaft Full duplex line testing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE441052B (en) * 1984-02-01 1985-09-02 Ellemtel Utvecklings Ab PROCEDURE TO TEST THE FUNCTION OF AN ADAPTIVE ECO-ELIMINATION DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014506A1 (en) * 1979-02-02 1980-08-20 R.T.C. LA RADIOTECHNIQUE-COMPELEC Société anonyme dite: Low-pass filter for low-frequency signals
AU5514380A (en) * 1979-02-05 1980-08-14 T.R.T. Testing echo cancellor
AU4056285A (en) * 1984-03-30 1985-10-03 Siemens Aktiengesellschaft Full duplex line testing

Also Published As

Publication number Publication date
EP0300352A1 (en) 1989-01-25
ATE83344T1 (en) 1992-12-15
DE3876523D1 (en) 1993-01-21
EP0300352B1 (en) 1992-12-09
ES2037147T3 (en) 1993-06-16
AU1911188A (en) 1989-02-02
NO300520B1 (en) 1997-06-09
JPS6436226A (en) 1989-02-07
JPH0748680B2 (en) 1995-05-24
GR3007224T3 (en) 1993-07-30
NO883128L (en) 1989-01-17
NO883128D0 (en) 1988-07-13

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