AU574282B2 - Echo compensation by adaptive transversal filtering - Google Patents

Echo compensation by adaptive transversal filtering

Info

Publication number
AU574282B2
AU574282B2 AU68095/87A AU6809587A AU574282B2 AU 574282 B2 AU574282 B2 AU 574282B2 AU 68095/87 A AU68095/87 A AU 68095/87A AU 6809587 A AU6809587 A AU 6809587A AU 574282 B2 AU574282 B2 AU 574282B2
Authority
AU
Australia
Prior art keywords
digital
adaptive transversal
circuit
analog
khz
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
AU68095/87A
Other versions
AU6809587A (en
Inventor
Hartmut Kemmesies
Dirsko Von Pfeil
Erhard Waretzi
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 AU6809587A publication Critical patent/AU6809587A/en
Application granted granted Critical
Publication of AU574282B2 publication Critical patent/AU574282B2/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
    • H04B3/20—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)
  • Optical Communication System (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Primary Cells (AREA)
  • Lock And Its Accessories (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

In a trunk circuit for digital signals, a digital subtracting circuit (3a) and an adaptive transversal filter (7) are inserted in a shunt branch between the transmitting path (6) and the receiving path (19). On the trunk circuit (6,19), digital signals are transmitted in the original frequency band from 0.3 to 3.4 kHz. A direct voltage or a digital sweep or noise signal in the original frequency bands 0 to 0.3 and 3.4 to 4 kHz, which are generated in the digital additional-signal generator (15a), are superimposed on such a received signal via a digital adding circuit (11a). This prevents the coefficients from escaping from a predetermined band. When analog/digital and digital/analog converters are inserted for digital operation of the adaptive transversal filter (7), connection to analog trunk circuits is also possible. These echo compensators are used, in particular, in international gateway exchanges. <IMAGE>
AU68095/87A 1986-01-30 1987-01-29 Echo compensation by adaptive transversal filtering Ceased AU574282B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3602803 1986-01-30
DE3602803 1986-01-30

Publications (2)

Publication Number Publication Date
AU6809587A AU6809587A (en) 1987-08-13
AU574282B2 true AU574282B2 (en) 1988-06-30

Family

ID=6292977

Family Applications (1)

Application Number Title Priority Date Filing Date
AU68095/87A Ceased AU574282B2 (en) 1986-01-30 1987-01-29 Echo compensation by adaptive transversal filtering

Country Status (8)

Country Link
EP (1) EP0231854B1 (en)
JP (1) JPH06101668B2 (en)
AT (1) ATE62365T1 (en)
AU (1) AU574282B2 (en)
CA (1) CA1332449C (en)
DE (1) DE3768975D1 (en)
ES (1) ES2021285B3 (en)
GR (1) GR3001866T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU586959B2 (en) * 1987-07-29 1989-07-27 Siemens Aktiengesellschaft An echo compensator
AU604137B2 (en) * 1987-07-20 1990-12-06 Nec Corporation Echo canceller

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391784B (en) * 1987-11-25 1990-11-26 Siemens Ag Oesterreich METHOD FOR ADAPTIVELY COMPENSATING AN ECHO IN A COMMUNICATION DEVICE
DE4202206C2 (en) * 1992-01-28 1998-06-10 Bosch Gmbh Robert Analog / digital compensator with level control for a hybrid circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3475684A (en) * 1983-10-28 1985-05-09 Etablissement Public De Diffusion Dit "Telediffusion De France" Echo cancellor
AU4626785A (en) * 1984-08-17 1986-02-20 Telecommunications Radioelectriques Et Telephoniques T.R.T. Echo cancellor using delta modulation
AU4695485A (en) * 1984-09-21 1986-03-27 Alcatel N.V. Digital hybrid

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496364A1 (en) * 1980-12-17 1982-06-18 Trt Telecom Radio Electr ECHO CANCELLATOR FOR DIGITAL TELEPHONE TRANSMISSION IMPLEMENTING A PSEUDO-LOGARITHMIC ENCODING LAW
US4769808A (en) * 1984-09-19 1988-09-06 Nec Corporation Method of cancelling echoes in full-duplex data transmission system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3475684A (en) * 1983-10-28 1985-05-09 Etablissement Public De Diffusion Dit "Telediffusion De France" Echo cancellor
AU4626785A (en) * 1984-08-17 1986-02-20 Telecommunications Radioelectriques Et Telephoniques T.R.T. Echo cancellor using delta modulation
AU4695485A (en) * 1984-09-21 1986-03-27 Alcatel N.V. Digital hybrid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU604137B2 (en) * 1987-07-20 1990-12-06 Nec Corporation Echo canceller
AU586959B2 (en) * 1987-07-29 1989-07-27 Siemens Aktiengesellschaft An echo compensator

Also Published As

Publication number Publication date
CA1332449C (en) 1994-10-11
ATE62365T1 (en) 1991-04-15
EP0231854A1 (en) 1987-08-12
JPS62183230A (en) 1987-08-11
EP0231854B1 (en) 1991-04-03
GR3001866T3 (en) 1992-11-23
JPH06101668B2 (en) 1994-12-12
DE3768975D1 (en) 1991-05-08
AU6809587A (en) 1987-08-13
ES2021285B3 (en) 1991-11-01

Similar Documents

Publication Publication Date Title
US4649505A (en) Two-input crosstalk-resistant adaptive noise canceller
FI863169A (en) FULLSTAENDIGT DUBBELRIKTAD HOEGTALARTELEFON FOER RADIO- OCH KABELTELEFONSYSTEM.
EP0708537A4 (en) Echo canceler and echo path estimating method
US4796296A (en) PCM coder and decoder having function of two-wire/four-wire conversion
WO1996021304A3 (en) Combating signal interference in digital transmission
CA2083589A1 (en) Adaptive feed-forward method and apparatus for amplifier noise reduction
CA2054606A1 (en) Tap-weight adaptation control using stepsize inversely variable with signal power level
AU574282B2 (en) Echo compensation by adaptive transversal filtering
KR100427231B1 (en) Analog echo filter
DE59309582D1 (en) Procedure for eliminating interference from stereo broadcast signals
GR3021752T3 (en) Method for testing the transmission characteristics of a subscriber line circuit
EP0271166A3 (en) Digital circuit arrangement for reducing the quantizing noise
WO1992004794A3 (en) Alarm and test system for a digital main line
GR3029267T3 (en) Terminal for data transmission over an analogous bidirectional line with echo cancellation coupled to the reception clock
FI943271A0 (en) Device for reducing the risk of unwanted drift of adaptive filter parameters used for echo cancellation
SE8203102L (en) ADAPTIVE ECHO COMPENSATION DEVICE FOR DIGITAL DUPLEX COMMUNICATION THROUGH TV WIRES
EP0485828A3 (en) Optical receiver
FI106326B (en) Wiring to adapt the echo cancellation multi speed modem to the line, and wiring method
KR890002374Y1 (en) Hybrid circuit of key system
CA2350281A1 (en) Alarm and test system for a digital main line
JPS5566161A (en) Two-wire system full double digital transmission device
GB2107154A (en) Acoustic coupler
ATE138232T1 (en) METHOD AND CIRCUIT ARRANGEMENT FOR COMPENSATING ECHO SIGNALS DURING A DIGITAL SIGNAL TRANSMISSION OVER A TWO-WIRE LINE
SU1021004A1 (en) Telephone delta-modulation communication device
JPS5793769A (en) Transmitter for audio and data signals