DE3141501C2 - - Google Patents
Info
- Publication number
- DE3141501C2 DE3141501C2 DE3141501A DE3141501A DE3141501C2 DE 3141501 C2 DE3141501 C2 DE 3141501C2 DE 3141501 A DE3141501 A DE 3141501A DE 3141501 A DE3141501 A DE 3141501A DE 3141501 C2 DE3141501 C2 DE 3141501C2
- Authority
- DE
- Germany
- Prior art keywords
- digital
- filter
- analog
- signal
- circuit arrangement
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
-
- 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
- H04B1/00—Details 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
- H04B1/38—Transceivers, 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
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/586—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using an electronic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03611—Iterative algorithms
- H04L2025/03656—Initialisation
- H04L2025/03668—Initialisation to the value at the end of a previous adaptation period
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Networks Using Active Elements (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Processing Of Color Television Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/199,904 US4351060A (en) | 1980-10-23 | 1980-10-23 | Automatic, digitally synthesized matching line terminating impedance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3141501A1 DE3141501A1 (de) | 1982-06-24 |
| DE3141501C2 true DE3141501C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1988-01-28 |
Family
ID=22739494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19813141501 Granted DE3141501A1 (de) | 1980-10-23 | 1981-10-20 | Schaltungsanordnung zur zweidraht-vie3rdraht-umsetzung, insbesondere digitale teilnehmeranschlussschaltung mit mitteln zur automnatischen impedanzanpassung an die teilnehmerleitung |
Country Status (31)
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4453255A (en) * | 1981-02-05 | 1984-06-05 | Victor Company Of Japan, Ltd. | Characteristic control system for a digital equalizer |
| US4669115A (en) * | 1981-12-07 | 1987-05-26 | Regents Of The University Of California | Hybrid circuit and method |
| GB2130851A (en) * | 1982-11-24 | 1984-06-06 | Grundy & Partners Ltd | Hybrid junction circuits |
| DE3408384C2 (de) * | 1983-03-11 | 1993-11-25 | Nippon Telegraph & Telephone | Schaltkreis zur Nachbildung einer Impedanz |
| JPS60141006A (ja) * | 1983-12-28 | 1985-07-26 | Nec Corp | インピ−ダンス合成回路 |
| DE3428106A1 (de) * | 1984-07-30 | 1986-02-06 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Teilnehmeranschlussschaltung |
| AU583222B2 (en) * | 1985-08-20 | 1989-04-20 | Mitsubishi Denki Kabushiki Kaisha | Equalizer and equalizing circuit using the same |
| GB8528843D0 (en) * | 1985-11-22 | 1985-12-24 | British Telecomm | Codec |
| US4682176A (en) * | 1986-03-12 | 1987-07-21 | The United States Of America As Represented By The Secretary Of The Air Force | Active matching transmit/receive module |
| US4788652A (en) * | 1987-03-26 | 1988-11-29 | Unisys Corporation | I-Q channel adaptive line enhancer |
| US4726035A (en) * | 1987-03-26 | 1988-02-16 | Unisys Corporation | Analog/digital adaptive line enhancer |
| US4759035A (en) * | 1987-10-01 | 1988-07-19 | Adtran | Digitally controlled, all rate equalizer |
| DE3887057T2 (de) * | 1987-10-02 | 1994-08-25 | Advanced Micro Devices Inc | Adaptiver Echokompensator mit Doppel-Spracherkennung. |
| US4908857A (en) * | 1989-05-22 | 1990-03-13 | Siemens Transmission Systems, Inc. | Isolated drive circuit |
| US5018166A (en) * | 1989-10-10 | 1991-05-21 | Hayes Microcomputer Products, Inc. | Method and apparatus for baud timing recovery |
| DE3939906A1 (de) * | 1989-12-02 | 1991-06-06 | Rohde & Schwarz | Frequenzfilter ersten oder hoeheren grades |
| EP0448753B1 (de) * | 1990-03-27 | 1993-11-03 | Siemens Aktiengesellschaft | Zweidraht-Vierdraht-Umsetzer |
| EP0448754B1 (de) * | 1990-03-27 | 1993-11-03 | Siemens Aktiengesellschaft | Zweidraht-Vierdraht-Umsetzer |
| US5282157A (en) * | 1990-09-13 | 1994-01-25 | Telecom Analysis Systems, Inc. | Input impedance derived from a transfer network |
| US5249225A (en) * | 1991-10-25 | 1993-09-28 | Coherent Communications Systems Corp. | Self-balancing hybrid using digitally programmable attenuator for variable impedance elements |
| US6198817B1 (en) | 1998-01-23 | 2001-03-06 | International Business Machines Corporation | Communication interface having combined shaping of receive response and synthesized matching terminating impedances for different frequency bands and a design method therefor |
| US6181792B1 (en) | 1998-01-23 | 2001-01-30 | International Business Machines Corporation | Communication interface having synthesized matching impedances for different frequency bands and a design method therefor |
| US6553118B1 (en) * | 1999-05-11 | 2003-04-22 | Agere Systems Inc. | Method and apparatus for calculating DC offset in a digital gyrator |
| US6573729B1 (en) | 2000-08-28 | 2003-06-03 | 3Com Corporation | Systems and methods for impedance synthesis |
| US7212502B2 (en) * | 2002-08-08 | 2007-05-01 | General Instrument Corporation | Method and apparatus for dynamically adapting telephony analog loss based on channel content |
| DE102004014199A1 (de) * | 2004-03-23 | 2005-10-20 | Siemens Ag | Schaltungsanordnung und Verfahren zur Dimensionierung eines Netzwerkes |
| US8019096B2 (en) * | 2009-04-10 | 2011-09-13 | Apple Inc. | Electronic device and external equipment with configurable audio path circuitry |
| US10393781B2 (en) * | 2013-08-05 | 2019-08-27 | National Instruments Ireland Resources Limited | Impedance synthesizer |
| US12381595B1 (en) * | 2021-10-08 | 2025-08-05 | Shenzhen Hollyland Technology Co., Ltd. | Interface conversion apparatus, communication system, and echo cancellation method and apparatus |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3579109A (en) * | 1969-04-02 | 1971-05-18 | Gen Dynamics Corp | Automatic equalizer for digital data transmission systems |
| US3633105A (en) * | 1970-04-01 | 1972-01-04 | Gte Automatic Electric Lab Inc | Digital adaptive equalizer system |
| US3789560A (en) * | 1971-08-20 | 1974-02-05 | Round Eight Corp | Square circle house or like building structure |
| US3828281A (en) * | 1973-02-26 | 1974-08-06 | Lorain Prod Corp | Impedance simulating circuit for transmission lines |
| US3906488A (en) * | 1974-02-14 | 1975-09-16 | Univ California | Reversible analog/digital (digital/analog) converter |
| IT1024828B (it) * | 1974-11-15 | 1978-07-20 | Oselt Centro Studi E Lab Telec | Equalizzatore numerico per trasmissione di dati |
| US4021654A (en) * | 1975-06-11 | 1977-05-03 | Paradyne, Inc. | Digital filter |
| US4057696A (en) * | 1976-08-09 | 1977-11-08 | Bell Telephone Laboratories, Incorporated | Recursive-like adaptive echo canceller |
| US4072830A (en) * | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
| GB1583634A (en) * | 1977-03-02 | 1981-01-28 | Int Standard Electric Corp | Subscriber line/trunk circuit |
| US4125900A (en) * | 1977-07-01 | 1978-11-14 | Ncr Corporation | Cascaded recursive digital filter |
| GB2008903B (en) * | 1977-08-17 | 1982-06-30 | Gen Electric Co Ltd | Amplifier arrangements |
| JPS54136253A (en) * | 1978-04-14 | 1979-10-23 | Nec Corp | Adaptive type electronic hybrid circuit |
| JPS54157407A (en) * | 1978-06-02 | 1979-12-12 | Hitachi Ltd | Level control unit for time-division exchange |
| IT1115559B (it) * | 1978-08-29 | 1986-02-03 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per la cancellazione numerica dell eco |
| AU544141B2 (en) * | 1980-06-18 | 1985-05-16 | Advanced Micro Devices Inc. | Interpolative encoder for subscriber line audio processing circuit apparatus |
-
1980
- 1980-10-23 US US06/199,904 patent/US4351060A/en not_active Expired - Lifetime
-
1981
- 1981-09-22 GB GB8128569A patent/GB2086196B/en not_active Expired
- 1981-09-23 PH PH26247A patent/PH17612A/en unknown
- 1981-09-30 ZA ZA816778A patent/ZA816778B/xx unknown
- 1981-10-07 IL IL64020A patent/IL64020A/xx unknown
- 1981-10-13 NO NO813438A patent/NO157035C/no unknown
- 1981-10-13 MX MX189620A patent/MX151068A/es unknown
- 1981-10-14 BR BR8106624A patent/BR8106624A/pt not_active IP Right Cessation
- 1981-10-15 RO RO105568A patent/RO84856B/ro unknown
- 1981-10-15 NZ NZ198651A patent/NZ198651A/en unknown
- 1981-10-16 CA CA000388119A patent/CA1168776A/en not_active Expired
- 1981-10-16 NL NL8104701A patent/NL8104701A/nl not_active Application Discontinuation
- 1981-10-16 AU AU76522/81A patent/AU546106B2/en not_active Expired
- 1981-10-19 SE SE8106156A patent/SE454638B/sv not_active IP Right Cessation
- 1981-10-20 PT PT73847A patent/PT73847B/pt unknown
- 1981-10-20 DE DE19813141501 patent/DE3141501A1/de active Granted
- 1981-10-22 AT AT0451181A patent/AT394293B/de not_active IP Right Cessation
- 1981-10-22 FR FR8119822A patent/FR2493078B1/fr not_active Expired
- 1981-10-22 ES ES506466A patent/ES506466A0/es active Granted
- 1981-10-22 IT IT24626/81A patent/IT1195223B/it active
- 1981-10-22 DK DK465881A patent/DK465881A/da not_active Application Discontinuation
- 1981-10-22 IN IN1175/CAL/81A patent/IN155460B/en unknown
- 1981-10-23 JP JP56168906A patent/JPS5799828A/ja active Pending
- 1981-10-23 FI FI813326A patent/FI813326L/fi not_active Application Discontinuation
- 1981-10-23 YU YU02533/81A patent/YU253381A/xx unknown
- 1981-10-23 CH CH6780/81A patent/CH656759A5/de not_active IP Right Cessation
- 1981-10-23 PL PL1981233559A patent/PL134852B1/pl unknown
- 1981-10-23 KR KR1019810004052A patent/KR830008568A/ko not_active Ceased
- 1981-10-23 BE BE2/59427A patent/BE890839A/nl not_active IP Right Cessation
-
1985
- 1985-11-09 SG SG845/85A patent/SG84585G/en unknown
- 1985-11-14 HK HK906/85A patent/HK90685A/xx unknown
Also Published As
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8128 | New person/name/address of the agent |
Representative=s name: GRAF, G., DIPL.-ING., PAT.-ASS., 7000 STUTTGART |
|
| 8125 | Change of the main classification |
Ipc: H04Q 1/18 |
|
| 8127 | New person/name/address of the applicant |
Owner name: ALCATEL N.V., AMSTERDAM, NL |
|
| D2 | Grant after examination | ||
| 8363 | Opposition against the patent | ||
| 8365 | Fully valid after opposition proceedings | ||
| 8339 | Ceased/non-payment of the annual fee |