AU8428082A - Cross-talk/echo compensation - Google Patents
Cross-talk/echo compensationInfo
- Publication number
- AU8428082A AU8428082A AU84280/82A AU8428082A AU8428082A AU 8428082 A AU8428082 A AU 8428082A AU 84280/82 A AU84280/82 A AU 84280/82A AU 8428082 A AU8428082 A AU 8428082A AU 8428082 A AU8428082 A AU 8428082A
- Authority
- AU
- Australia
- Prior art keywords
- signal
- compensation
- wire line
- input
- arm
- 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
- 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
-
- 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
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Interface Circuits In Exchanges (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Dc Digital Transmission (AREA)
- Paper (AREA)
- Stereophonic System (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Bidirectional Digital Transmission (AREA)
Abstract
1. A digital telecommunications system comprising a crosstalk- and/or echo compensation circuit which is arranged between a four-wire line transmitting arm (VS), in particular the four-wire line arm incoming into a hybrid circuit (G), and a four-wire line receiving arm (VE), in particular the four-wire line arm outgoing from the hybrid circuit (G), and comprising a compensation signal store (KS) which can be operated in accordance with transmitted signal pulses occurring in the incoming four-wire line arm, where the crosstalk- and/or echo signal which occurs in the outgoing four-wire line arm as a result of a transmitted signal pulse occurring in the incoming four-line arm is input into the compensation signal store (KS) and, during a signal transmission, in response to each transmitted signal pulse, is read out therefrom as compensation signal, characterised in that the compensation signal store (KS) comprises a plurality (r) of circulating shift registers (UR), each of which has a circulation time equal to n-times (where n = 1, 2, 3 ...) a transmission signal bit time interval (tau 0 ) and a corresponding number n of outputs which follow one another at intervals corresponding to a transmission signal bit time interval (tau 0 ) and which are combined by a following evaluation- and addition circuit (ADD), into which circulating shift registers partial-compensation signals, obtained in the course of a series of isolated transmitted signal pulses, are input, where the echo- and/or crosstalk signal which directly corresponds to a transmitted signal pulse is input, in quantised and coded form, into the first circulating shift register (UR1) as partial-compensation signal and into the following circulating shift registers (..., URr) is input successively the respective echo and/or crosstalk signal, which has been sub-compensated by the partial-compensation signal(s) already input into a circulating shift register (UR1, ...), as further partial-compensation signal.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE31215459 | 1981-05-29 | ||
DE3121545A DE3121545C2 (en) | 1981-05-29 | 1981-05-29 | Crosstalk and / or Echo cancellation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
AU8428082A true AU8428082A (en) | 1982-12-02 |
AU554002B2 AU554002B2 (en) | 1986-08-07 |
Family
ID=6133568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU84280/82A Ceased AU554002B2 (en) | 1981-05-29 | 1982-05-28 | Cross-talk/echo compensation |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0066006B1 (en) |
JP (1) | JPS57203354A (en) |
AT (1) | ATE22635T1 (en) |
AU (1) | AU554002B2 (en) |
BR (1) | BR8203166A (en) |
DE (1) | DE3121545C2 (en) |
LU (1) | LU83692A1 (en) |
SU (1) | SU1605937A3 (en) |
ZA (1) | ZA823769B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU567957B2 (en) * | 1983-07-29 | 1987-12-10 | Siemens Aktiengesellschaft | Digital echo cancellation |
AU570380B2 (en) * | 1983-08-10 | 1988-03-10 | N.V. Philips Gloeilampenfabrieken | Data transmission system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1186029A (en) * | 1982-06-11 | 1985-04-23 | Gordon F. Mein | Automatic correction circuit for received digitally encoded signals |
JPH0886241A (en) * | 1994-09-16 | 1996-04-02 | Hitachi Ltd | Drive device for sensor and actuator |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH423875A (en) * | 1964-07-23 | 1966-11-15 | Gretag Ag | Method and device for the transmission of messages over channels of limited bandwidth |
US3426281A (en) * | 1966-02-28 | 1969-02-04 | Us Army | Reception of time dispersed signals utilizing impulse response storage in recirculating delay lines |
JPS5128413A (en) * | 1974-09-03 | 1976-03-10 | Nippon Electric Co | TEKIOGATAHANKYOSHOKYOSOCHI |
US4024358A (en) * | 1975-10-31 | 1977-05-17 | Communications Satellite Corporation (Comsat) | Adaptive echo canceller using differential pulse code modulation encoding |
NO140648C (en) * | 1977-10-24 | 1983-03-29 | Elektrisk Bureau As | DIRECTIVE CONNECTOR. |
JPS5829023B2 (en) * | 1978-07-10 | 1983-06-20 | 富士通株式会社 | data communication equipment |
DE2853167C2 (en) * | 1978-12-08 | 1980-10-30 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Subscriber circuit |
JPS55123243A (en) * | 1979-03-16 | 1980-09-22 | Fujitsu Ltd | Echo canceler |
DE2920575C2 (en) * | 1979-05-21 | 1981-09-17 | Siemens AG, 1000 Berlin und 8000 München | Digital telecommunications system with at least one four-wire line section |
DE3116863C2 (en) * | 1981-04-28 | 1985-08-08 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for digital signal echo cancellation |
-
1981
- 1981-05-29 DE DE3121545A patent/DE3121545C2/en not_active Expired
- 1981-10-07 AT AT81108041T patent/ATE22635T1/en not_active IP Right Cessation
- 1981-10-07 EP EP81108041A patent/EP0066006B1/en not_active Expired
- 1981-10-12 LU LU83692A patent/LU83692A1/en unknown
-
1982
- 1982-05-28 JP JP57091140A patent/JPS57203354A/en active Pending
- 1982-05-28 BR BR8203166A patent/BR8203166A/en unknown
- 1982-05-28 AU AU84280/82A patent/AU554002B2/en not_active Ceased
- 1982-05-28 ZA ZA823769A patent/ZA823769B/en unknown
- 1982-05-28 SU SU823445700A patent/SU1605937A3/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU567957B2 (en) * | 1983-07-29 | 1987-12-10 | Siemens Aktiengesellschaft | Digital echo cancellation |
AU570380B2 (en) * | 1983-08-10 | 1988-03-10 | N.V. Philips Gloeilampenfabrieken | Data transmission system |
Also Published As
Publication number | Publication date |
---|---|
SU1605937A3 (en) | 1990-11-07 |
DE3121545C2 (en) | 1986-12-04 |
EP0066006A3 (en) | 1984-01-11 |
JPS57203354A (en) | 1982-12-13 |
AU554002B2 (en) | 1986-08-07 |
ZA823769B (en) | 1983-03-30 |
EP0066006B1 (en) | 1986-10-01 |
LU83692A1 (en) | 1982-02-18 |
BR8203166A (en) | 1983-05-17 |
EP0066006A2 (en) | 1982-12-08 |
ATE22635T1 (en) | 1986-10-15 |
DE3121545A1 (en) | 1982-12-23 |
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