NO883128L - TESTING DEVICE FOR DIGITAL ECHO COMPENSATORS. - Google Patents

TESTING DEVICE FOR DIGITAL ECHO COMPENSATORS.

Info

Publication number
NO883128L
NO883128L NO88883128A NO883128A NO883128L NO 883128 L NO883128 L NO 883128L NO 88883128 A NO88883128 A NO 88883128A NO 883128 A NO883128 A NO 883128A NO 883128 L NO883128 L NO 883128L
Authority
NO
Norway
Prior art keywords
amplitude
values
testing device
transmission path
test apparatus
Prior art date
Application number
NO88883128A
Other languages
Norwegian (no)
Other versions
NO300520B1 (en
NO883128D0 (en
Inventor
Dirsko V Pfeil
Frank Kuhn
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 NO883128D0 publication Critical patent/NO883128D0/en
Publication of NO883128L publication Critical patent/NO883128L/en
Publication of NO300520B1 publication Critical patent/NO300520B1/en

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>
NO883128A 1987-07-16 1988-07-13 Digital echo compensator test device NO300520B1 (en)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
NO883128D0 NO883128D0 (en) 1988-07-13
NO883128L true NO883128L (en) 1989-01-17
NO300520B1 NO300520B1 (en) 1997-06-09

Family

ID=6331725

Family Applications (1)

Application Number Title Priority Date Filing Date
NO883128A NO300520B1 (en) 1987-07-16 1988-07-13 Digital echo compensator test device

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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448251A1 (en) * 1979-02-02 1980-08-29 Radiotechnique Compelec LOW-PASS FILTER FOR LOW FREQUENCY SIGNALS
FR2448258A1 (en) * 1979-02-05 1980-08-29 Trt Telecom Radio Electr DEVICE TESTING SYSTEM WITH AN ECHO CANCER
SE441052B (en) * 1984-02-01 1985-09-02 Ellemtel Utvecklings Ab PROCEDURE TO TEST THE FUNCTION OF AN ADAPTIVE ECO-ELIMINATION DEVICE
EP0156315B1 (en) * 1984-03-30 1991-06-05 Siemens Aktiengesellschaft Circuit for testing the correct operation of a data transmission system

Also Published As

Publication number Publication date
EP0300352A1 (en) 1989-01-25
ATE83344T1 (en) 1992-12-15
DE3876523D1 (en) 1993-01-21
AU584020B2 (en) 1989-05-11
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
NO883128D0 (en) 1988-07-13

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