FR2377734A1 - DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER - Google Patents
DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIERInfo
- Publication number
- FR2377734A1 FR2377734A1 FR7701197A FR7701197A FR2377734A1 FR 2377734 A1 FR2377734 A1 FR 2377734A1 FR 7701197 A FR7701197 A FR 7701197A FR 7701197 A FR7701197 A FR 7701197A FR 2377734 A1 FR2377734 A1 FR 2377734A1
- Authority
- FR
- France
- Prior art keywords
- carrier
- data transmission
- echo
- modulation
- signal
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Bidirectional Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Annuleur d'écho numérique pour modem de transmission de données par modulation d'une porteuse à la fréquence 1/T au moyen de symboles se produisant à des instants iT. Cet annuleur d'écho comporte des moyens répondant à chaque configuration de symbole à chaque instant iT pour élaborer au moins un nombre dépendant de l'amplitude attribuée à la porteuse audit instant et pour diriger ce nombre vers au moins une partie déterminée d'un ensemble de filtres numériques adaptatifs dont les signaux de sortie sont combinés pour former la version numérique du signal de copie d'écho; les coefficients de ces filtres sont ajustés à partir du signal d'erreur entre le signal d'écho et le signal de copie d'écho, de façon à rendre minimale la valeur quadratique moyenne de ce signal d'erreur. Application : transmission de données en Duplex simultané.Digital echo canceller for data transmission modem by modulation of a carrier at frequency 1 / T by means of symbols occurring at times iT. This echo canceller comprises means responding to each symbol configuration at each instant iT to develop at least one number depending on the amplitude attributed to the carrier at said instant and to direct this number to at least a determined part of a set adaptive digital filters whose output signals are combined to form the digital version of the echo copy signal; the coefficients of these filters are adjusted from the error signal between the echo signal and the echo copy signal, so as to minimize the root mean square value of this error signal. Application: simultaneous duplex data transmission.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7701197A FR2377734A1 (en) | 1977-01-17 | 1977-01-17 | DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER |
GB142978A GB1580821A (en) | 1977-01-17 | 1978-01-13 | Digital echo canceller for a modem for data transmission by means of modulation of a carrier |
IT19251/78A IT1091970B (en) | 1977-01-17 | 1978-01-13 | DIGITAL DEVICE FOR THE CANCELLATION OF ECHOES, FOR A MODULATOR / DEMODULATOR, FOR THE TRANSMISSION OF DATA THROUGH MODULATION OF A CARRIER |
AU32430/78A AU514263B2 (en) | 1977-01-17 | 1978-01-13 | Digital echo canceller |
NL7800408A NL7800408A (en) | 1977-01-17 | 1978-01-13 | DIGITAL ECHOCOMPENSER FOR A MODEM FOR DATA TRANSMISSION USING CARRIER MODULATION. |
SE7800390A SE426763B (en) | 1977-01-17 | 1978-01-13 | DIGITAL ECHO ELIMINATOR FOR A MODEM FOR DATA TRANSFER BY MODULATION OF A BERVAG |
DE2801375A DE2801375C3 (en) | 1977-01-17 | 1978-01-13 | Digital echo canceller for a modem for data transmission with the aid of modulation of a carrier |
BE184361A BE862951A (en) | 1977-01-17 | 1978-01-16 | DIGITALE ECHOCOMPENSATOR VOOR EEN MODEM VOOR DATATRANSMISSIE MET BEHULP VAN MODULATIE VAN EEN DRAAGGOLF |
US05/869,508 US4162378A (en) | 1977-01-17 | 1978-01-16 | Digital echo canceler for a modem for data transmission by means of modulation of a carrier |
JP285878A JPS5390712A (en) | 1977-01-17 | 1978-01-17 | Digital echo cancelling device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7701197A FR2377734A1 (en) | 1977-01-17 | 1977-01-17 | DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2377734A1 true FR2377734A1 (en) | 1978-08-11 |
FR2377734B1 FR2377734B1 (en) | 1980-11-21 |
Family
ID=9185558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7701197A Granted FR2377734A1 (en) | 1977-01-17 | 1977-01-17 | DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE862951A (en) |
FR (1) | FR2377734A1 (en) |
GB (1) | GB1580821A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2475322A1 (en) * | 1980-02-01 | 1981-08-07 | Trt Telecom Radio Electr | ECHO CANCER WITH SIMPLIFIED CALCULATION CIRCUITS |
EP0048515B1 (en) * | 1980-09-19 | 1984-03-28 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Digital echo canceller comprising an analog to digital converter with adjustable volume range |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
CN117172163B (en) * | 2023-08-15 | 2024-04-12 | 重庆西南集成电路设计有限责任公司 | Amplitude and phase two-dimensional optimization method and system of amplitude and phase control circuit, medium and electronic equipment |
-
1977
- 1977-01-17 FR FR7701197A patent/FR2377734A1/en active Granted
-
1978
- 1978-01-13 GB GB142978A patent/GB1580821A/en not_active Expired
- 1978-01-16 BE BE184361A patent/BE862951A/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2475322A1 (en) * | 1980-02-01 | 1981-08-07 | Trt Telecom Radio Electr | ECHO CANCER WITH SIMPLIFIED CALCULATION CIRCUITS |
EP0033568A1 (en) * | 1980-02-01 | 1981-08-12 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Echo canceller with simplified computing circuits |
EP0048515B1 (en) * | 1980-09-19 | 1984-03-28 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Digital echo canceller comprising an analog to digital converter with adjustable volume range |
Also Published As
Publication number | Publication date |
---|---|
GB1580821A (en) | 1980-12-03 |
FR2377734B1 (en) | 1980-11-21 |
BE862951A (en) | 1978-07-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
DR | Decision of the appeal court due to an appeal at law against decisions of the director of the inpi, except decision of lapse | ||
TP | Transmission of property | ||
TP | Transmission of property |