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1. WO2000039986 - A METHOD AND APPARATUS FOR AN IMPROVED ANALOG ECHO CANCELLER

Publication Number WO/2000/039986
Publication Date 06.07.2000
International Application No. PCT/US1999/031128
International Filing Date 29.12.1999
Chapter 2 Demand Filed 31.07.2000
IPC
H04B 1/58 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
54using the same frequency for two directions of communication
58Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
H04M 1/76 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
738Interface circuits for coupling substations to external telephone lines
76Compensating for differences in line impedance
CPC
H04B 1/581
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
54using the same frequency for two directions of communication
58Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
581using a transformer
H04B 1/583
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
54using the same frequency for two directions of communication
58Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
583using a bridge network
H04B 1/586
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
54using the same frequency for two directions of communication
58Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
586using an electronic circuit
H04M 1/76
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
738Interface circuits for coupling substations to external telephone lines
76Compensating for differences in line impedance
Applicants
  • ADTRAN [US/US]; 901 Explorer Boulevard Huntsville, AL 35806-2807, US
Inventors
  • JOFFE, Daniel, M.; US
Agents
  • FOGARTY, John, A., Jr.; Baker & Botts, LLP 30 Rockefeller Plaza New York, NY 10112-0228, US
Priority Data
09/223,92331.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD AND APPARATUS FOR AN IMPROVED ANALOG ECHO CANCELLER
(FR) PROCEDE ET APPAREIL RELATIFS A UN SUPPRESSEUR D'ECHO ANALOGIQUE AMELIORE
Abstract
(EN)
A method and apparatus for providing an improved telephone hybrid function is provided. The present invention uses a transformer (340) having a galvanically isolated sense winding (348) to improve hybrid performance. Performance improvements include removing the effects of variations in winding resistance, independently adjsuting a pick-off voltage at (217), reducing the effects of transformer leakage inductance, providing DC isolation between circuits and increasing the signal to noise ratio at the receiver (290).
(FR)
L'invention porte sur un procédé et un appareil assurant une fonction téléphonique hybride améliorée et recourant à un transformateur (340) comportant un enroulement de détection isolé (348) en améliorant les performances hybrides. L'amélioration des performances comprend: l'élimination des variations de la résistance de l'enroulement; le réglage de manière indépendante de la tension de capture (217); la réduction de l'inductance de fuite du transformateur; la mise en place d'une isolation c.c. entre les circuits, et l'augmentation du rapport signal/bruit au niveau du récepteur (290).
Also published as
Latest bibliographic data on file with the International Bureau