[go: up one dir, main page]

ES8402483A1 - Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion. - Google Patents

Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion.

Info

Publication number
ES8402483A1
ES8402483A1 ES516965A ES516965A ES8402483A1 ES 8402483 A1 ES8402483 A1 ES 8402483A1 ES 516965 A ES516965 A ES 516965A ES 516965 A ES516965 A ES 516965A ES 8402483 A1 ES8402483 A1 ES 8402483A1
Authority
ES
Spain
Prior art keywords
signal
correction
pct
echo cancellation
filter
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.)
Expired
Application number
ES516965A
Other languages
English (en)
Other versions
ES516965A0 (es
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of ES516965A0 publication Critical patent/ES516965A0/es
Publication of ES8402483A1 publication Critical patent/ES8402483A1/es
Expired 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
    • H04B3/231—Echo cancellers using readout of a memory to provide the echo replica

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Analogue/Digital Conversion (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

METODO Y UN APARATO PARA PROPORCIONAR ANULACION DE ECO ADAPTATIVA EN UN SISTEMA DE TELECOMUNICACION. CONSISTE EN FORMAR UNA SEÑAL (EK) DE CONTROL CON AYUDA DE LA CUAL UNA UNIDAD DE CORRECCION (KB) GENERA SEÑALES PARA ACTUALIZAR LOS PARAMENTROS DE UN FILTRO (B) DE EQUILIBRADO. EXISTE UN CUANTIFICADOR (Q) QUE PROCESA UNA SEÑAL (RR) RECIBIDA, FORMANDO UNA SEÑAL (EK) DE ERROR. EL SIGNO DE LA MISMA SE CORRELACIONA CON UNA SEÑAL (AK) EN UNA UNIDAD (KV) DE CORRECCION.
ES516965A 1981-11-02 1982-10-29 Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion. Expired ES8402483A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8106444A SE426764B (sv) 1981-11-02 1981-11-02 Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet

Publications (2)

Publication Number Publication Date
ES516965A0 ES516965A0 (es) 1984-01-16
ES8402483A1 true ES8402483A1 (es) 1984-01-16

Family

ID=20344930

Family Applications (1)

Application Number Title Priority Date Filing Date
ES516965A Expired ES8402483A1 (es) 1981-11-02 1982-10-29 Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion.

Country Status (19)

Country Link
US (1) US4539674A (es)
EP (1) EP0092570B1 (es)
JP (1) JPS58501850A (es)
KR (1) KR860002211B1 (es)
AU (1) AU553372B2 (es)
BR (1) BR8207953A (es)
CA (2) CA1205876A (es)
DE (1) DE3265650D1 (es)
DK (1) DK306483D0 (es)
ES (1) ES8402483A1 (es)
FI (1) FI74561C (es)
IE (1) IE53759B1 (es)
IT (1) IT1153338B (es)
MX (1) MX152441A (es)
MY (1) MY8600355A (es)
NO (1) NO157238C (es)
SE (1) SE426764B (es)
WO (1) WO1983001716A1 (es)
YU (1) YU244082A (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE434789B (sv) * 1982-12-21 1984-08-13 Ellemtel Utvecklings Ab Forfarande for detektering av farliga linjespenningar over en tvatradig linje
FR2540314A1 (fr) * 1983-01-31 1984-08-03 Trt Telecom Radio Electr Procede d'initialisation des coefficients de filtres dans un dispositif d'annulation d'echos proche et lointain et dispositif de mise en oeuvre de ce procede
JPS59151546A (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
DE3327467A1 (de) * 1983-07-29 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zur kompensation von echosignalen
US4707824A (en) * 1983-12-15 1987-11-17 Nec Corporation Method and apparatus for cancelling echo
SE441052B (sv) * 1984-02-01 1985-09-02 Ellemtel Utvecklings Ab Forfarande for att testa funktionen hos en anordning for adaptiv ekoeliminering
IT1178913B (it) * 1984-03-26 1987-09-16 Cselt Centro Studi Lab Telecom Sistema per la trassmissione bidire zionale con cancellazione d eco
US4672665A (en) * 1984-07-27 1987-06-09 Matsushita Electric Industrial Co. Ltd. Echo canceller
US4989221A (en) * 1987-03-30 1991-01-29 Codex Corporation Sample rate converter
CA2004379C (en) * 1988-12-01 1993-07-06 Tetsu Taguchi Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
US5852661A (en) * 1995-02-17 1998-12-22 Advanced Micro Devices, Inc. Adaptive echo cancellation used with echo suppression to reduce short and long duration echoes
US6965578B1 (en) * 1998-09-30 2005-11-15 Conexant Systems, Inc. Echo canceling method and apparatus for digital data communication system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2277470A1 (fr) * 1974-07-03 1976-01-30 Cit Alcatel Dispositif de centrage d'un filtre transversal d'un annuleur d'echo
NL170688C (nl) * 1976-06-28 1982-12-01 Philips Nv Inrichting voor simultane tweerichtingsdatatransmissie over tweedraadsverbindingen.
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
NL7800408A (nl) * 1977-01-17 1978-07-19 Trt Telecom Radio Electr Digitale echocompensator voor een modem voor datatransmissie met behulp van modulatie van een draaggolf.
DE2729109A1 (de) * 1977-06-28 1979-01-11 Siemens Ag Schaltungsanordnung zur kompensation von echos in nichtsynchronen traegerfrequenzsystemen
US4268727A (en) * 1979-03-14 1981-05-19 International Telephone And Telegraph Corporation Adaptive digital echo cancellation circuit
CA1173128A (en) * 1981-10-13 1984-08-21 Pok F. Lee Echo cancellation using transversal filters

Also Published As

Publication number Publication date
NO157238C (no) 1988-02-10
WO1983001716A1 (en) 1983-05-11
IE822605L (en) 1983-05-02
BR8207953A (pt) 1983-10-04
DK306483A (da) 1983-07-01
KR860002211B1 (ko) 1986-12-31
EP0092570B1 (en) 1985-08-21
FI832228L (fi) 1983-06-17
MX152441A (es) 1985-07-15
CA1191224A (en) 1985-07-30
MY8600355A (en) 1986-12-31
YU244082A (en) 1985-04-30
AU9122282A (en) 1983-05-18
NO832420L (no) 1983-07-01
SE426764B (sv) 1983-02-07
JPS58501850A (ja) 1983-10-27
IE53759B1 (en) 1989-02-01
NO157238B (no) 1987-11-02
IT8224025A0 (it) 1982-11-02
CA1205876A (en) 1986-06-10
FI832228A0 (fi) 1983-06-17
AU553372B2 (en) 1986-07-10
ES516965A0 (es) 1984-01-16
KR840002785A (ko) 1984-07-16
IT1153338B (it) 1987-01-14
FI74561B (fi) 1987-10-30
DE3265650D1 (en) 1985-09-26
US4539674A (en) 1985-09-03
FI74561C (sv) 1988-02-08
EP0092570A1 (en) 1983-11-02
DK306483D0 (da) 1983-07-01

Similar Documents

Publication Publication Date Title
US4764955A (en) Process for determining an echo path flat delay and echo canceler using said process
EP0199879B1 (en) A process and system for improving echo cancellation within a transmission network
EP0021317B1 (en) Adaptive filter with tap coefficient leakage
ES8402128A1 (es) Una estacion de transmision digital.
ES8402483A1 (es) Metodo y aparato para proporcionar cancelacion adaptable de ecos en un sistema de telecomunicacion.
EP0708537A4 (en) METHOD FOR ECHOCOMPENSATION AND ECHOPHAL ESTIMATION
TW359932B (en) A transmitter apparatus for performing pre-coding, communications equipment with a precoder, communication system with such an equipment, and the method for pre-equalizing a signal in a communication device
WO2001020919A8 (en) Method and apparatus for adaptively compensating channel or system variations in precoded communications system
CA2161722A1 (en) Modem receiver preemphasis
EP0299648B1 (en) Echo cancellation
JPH01500872A (ja) Ｒｅｌｐボコーダを統合した線形予測エコ―キヤンセラ
EP0121557B1 (en) Adaptive filter including controlled tap gain coefficient drift
US4686703A (en) System for bidirectional digital transmission with echo cancellation
US4982428A (en) Arrangement for canceling interference in transmission systems
EP0092569B1 (en) A fir-type balance filter incorporated in the transmitter-receiver unit in a telecommunication system
EP0219537B1 (en) Method and apparatus for adjusting a digital equalizing filter in simultaneous adaptive echo elimination and adaptive elimination of noise caused by intersymbol interference
JP3419130B2 (ja) エコーキャンセラ装置
GB2102255A (en) Two-wire line for digital communication
AU561497B2 (en) Differential pcm transmission
JPS62132442A (ja) 反響消去方法
SU1485425A1 (ru) Адаптивное дуплексное устройство передачи данных
TW281833B (en) Method and apparatus for reducing residual far-end echo in voice communications networks
JPS6167330A (ja) エコ−除去方法
JPH02146827A (ja) エコーキャンセラ
JPH0496522A (ja) 全２重モデム用エコーキャンセラ装置

Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19981201