FI73104B - Balansfilter av fir-typ ingaoende i saendar-mottagarenheten i ett telekommunikationssystem. - Google Patents
Balansfilter av fir-typ ingaoende i saendar-mottagarenheten i ett telekommunikationssystem. Download PDFInfo
- Publication number
- FI73104B FI73104B FI832229A FI832229A FI73104B FI 73104 B FI73104 B FI 73104B FI 832229 A FI832229 A FI 832229A FI 832229 A FI832229 A FI 832229A FI 73104 B FI73104 B FI 73104B
- Authority
- FI
- Finland
- Prior art keywords
- filter
- group
- unit
- memory
- signal
- Prior art date
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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
-
- 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
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Circuits Of Receivers In General (AREA)
- Selective Calling Equipment (AREA)
Claims (3)
1. FIR-tyyppinen tasapainosuodin (B), jossa on joukko viivästyslenkkejä (T^, T2,...), jotka sisältyvät lähe-5 tinvastaanotinyksikköön teleliikennejärjestelmässä, jossa digitaalista informaatiota siirretään dupleksina yhden ainoan johdinparin kautta (kaksijohtiminen yhteys), jolloin ainakin yksi korjausyksikkö (KBl) on sovitettu suotimen parametrien (cj) korjaamiseksi niin, että tasapainosuoti-10 men ulostulosignaali (yk) tulee samaksi kuin omalta lä-hetyspuolelta vastaanottopuolelle ilmestyvä signaali (vuotosignaali) näytteenottohetkellä (k=l,2,...), tunnettu siitä, että joukko viivästyslenkkejä (Tl,T2,...) suotimessa on jaettu ainakin kahteen ryhmään, jolloin toi-15 sessa ryhmässä on ensimmäinen lukumäärä Nl ja toisessa ryhmässä on toinen lukumäärä N2 sekä että ainakin ensimmäisen ryhmän lenkkeihin on liitetty osoitusyksikkö (AEl) osoitteen muodostamiseksi Nlrstä ensiksi sisääntulevasta datasymbolista (bk, k=l,2,...Nl), jolloin osoitusyksik-20 köön (AEl) on liitetty kerroinmuisti (Ml), joka muisti sisältää lukumäärältään Nl ulostulosignaalin arvot, jotka signaalit muodostavat suotimen parametrit ja jotka osoitusyksikkö osoittaa sekä jotka ovat sovitetut mainitun korjausyksikön päivitettäviksi.
2. Patenttivaatimuksen 1 mukainen tasapainosuodin, tunnettu siitä, että toinen ryhmä, jossa on N2 viivästyslenkkiä on liitetty osoitusyksikköön (AE2) osoitteen muodostamiseksi N2=N-N1 Nl:n ensin sisääntulevan jälkeen suodimeen sisääntulevasta ja lähetetystä data-30 symbolista (bk,k=Nl+l,...N), jolloin kerroinmuisti (M2) on liitetty mainittuun osoitusmuistiin (AE2), joka muisti (M2) sisältää arvon lukumäärältään N2:lle ulostulosignaalille, jotka muodostavat suotimen parametrit ja jotka mainittu osoitusyksikkö (AE2) osoittaa.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8106445A SE426765B (sv) | 1981-11-02 | 1981-11-02 | Balansfilter av fir-typ ingaende i sendar-mottagarenheten i ett telekommunikationssystem |
SE8106445 | 1981-11-02 | ||
SE8200362 | 1982-11-02 | ||
PCT/SE1982/000362 WO1983001715A1 (en) | 1981-11-02 | 1982-11-02 | An fir-type balance filter incorporated in the transmitter-receiver unit in a telecommunication system |
Publications (4)
Publication Number | Publication Date |
---|---|
FI832229A0 FI832229A0 (fi) | 1983-06-17 |
FI832229L FI832229L (fi) | 1983-06-17 |
FI73104B true FI73104B (fi) | 1987-04-30 |
FI73104C FI73104C (fi) | 1987-08-10 |
Family
ID=20344931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI832229A FI73104C (fi) | 1981-11-02 | 1983-06-17 | Balansfilter av fir-typ ingaoende i saendar-mottagarenheten i ett telekommunikationssystem. |
Country Status (18)
Country | Link |
---|---|
US (1) | US4571719A (fi) |
EP (1) | EP0092569B1 (fi) |
JP (1) | JPS58501849A (fi) |
KR (1) | KR870000629B1 (fi) |
AU (1) | AU553371B2 (fi) |
BR (1) | BR8207952A (fi) |
DE (1) | DE3261072D1 (fi) |
DK (1) | DK301783D0 (fi) |
ES (1) | ES516966A0 (fi) |
FI (1) | FI73104C (fi) |
IE (1) | IE53760B1 (fi) |
IT (1) | IT1153339B (fi) |
MX (1) | MX152128A (fi) |
MY (1) | MY100485A (fi) |
NO (1) | NO157239C (fi) |
SE (1) | SE426765B (fi) |
WO (1) | WO1983001715A1 (fi) |
YU (1) | YU244382A (fi) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1186764A (en) * | 1982-06-23 | 1985-05-07 | Akira Kanemasa | Echo canceler |
US4669116A (en) * | 1982-12-09 | 1987-05-26 | Regents Of The University Of California | Non-linear echo cancellation of data signals |
IT1208769B (it) * | 1983-10-12 | 1989-07-10 | Cselt Centro Studi Lab Telecom | Teristiche varianti nel tempo procedimento e dispositivo per la cancellazione numerica dell eco generato in collegamenti con carat |
NL8600817A (nl) * | 1986-03-28 | 1987-10-16 | At & T & Philips Telecomm | Adaptief filter voor het vormen van een echokompensatiesignaal in een zend-ontvangstelsel voor het in duplexvorm bedrijven van digitale communicatie over een enkel geleiderpaar. |
US4868874A (en) * | 1986-04-18 | 1989-09-19 | Hitachi, Ltd. | Echo canceller |
EP0255554B1 (de) * | 1986-08-07 | 1991-05-08 | Deutsche ITT Industries GmbH | Nichtrekursives Digitalfilter |
EP0280898A1 (de) * | 1987-02-18 | 1988-09-07 | Siemens Aktiengesellschaft | Schaltungsanordnung zum Unterdrücken von Echosignalen |
JP2581763B2 (ja) * | 1988-06-15 | 1997-02-12 | 株式会社日立製作所 | エコーキャンセラ |
CA1315356C (en) * | 1988-07-20 | 1993-03-30 | Seiji Miyoshi | Digital adaptive filter and method of convergence therein |
AU614447B2 (en) * | 1988-12-01 | 1991-08-29 | Nec Corporation | Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients |
US4982428A (en) * | 1988-12-29 | 1991-01-01 | At&T Bell Laboratories | Arrangement for canceling interference in transmission systems |
DE19645054C2 (de) * | 1996-10-31 | 1999-11-25 | Sgs Thomson Microelectronics | Vorrichtung und Verfahren zur Selektion von Adressenwörtern |
US8718474B2 (en) * | 2011-05-27 | 2014-05-06 | Nec Laboratories America, Inc. | Chromatic dispersion compensation using sign operations and lookup tables |
Family Cites Families (8)
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. |
IT1091970B (it) * | 1977-01-17 | 1985-07-06 | Trt Telecom Radio Electr | Dispositivo digitale per la cancellazione di echi,per un modulatore/demodulatore,per la trasmissione di dati mediante modulazione di una portante |
DE2729109A1 (de) * | 1977-06-28 | 1979-01-11 | Siemens Ag | Schaltungsanordnung zur kompensation von echos in nichtsynchronen traegerfrequenzsystemen |
JPS54157407A (en) * | 1978-06-02 | 1979-12-12 | Hitachi Ltd | Level control unit for time-division exchange |
US4268727A (en) * | 1979-03-14 | 1981-05-19 | International Telephone And Telegraph Corporation | Adaptive digital echo cancellation circuit |
FR2479617A1 (fr) * | 1980-03-26 | 1981-10-02 | Trt Telecom Radio Electr | Annuleur d'echo pour signal d'echo a phase variable |
US4425483A (en) * | 1981-10-13 | 1984-01-10 | Northern Telecom Limited | Echo cancellation using transversal filters |
-
1981
- 1981-11-02 SE SE8106445A patent/SE426765B/sv not_active IP Right Cessation
-
1982
- 1982-10-28 MX MX194979A patent/MX152128A/es unknown
- 1982-10-29 ES ES516966A patent/ES516966A0/es active Granted
- 1982-10-29 IE IE2606/82A patent/IE53760B1/en unknown
- 1982-11-01 YU YU02443/82A patent/YU244382A/xx unknown
- 1982-11-02 US US06/514,824 patent/US4571719A/en not_active Expired - Lifetime
- 1982-11-02 JP JP82503354A patent/JPS58501849A/ja active Pending
- 1982-11-02 WO PCT/SE1982/000362 patent/WO1983001715A1/en active IP Right Grant
- 1982-11-02 BR BR8207952A patent/BR8207952A/pt not_active IP Right Cessation
- 1982-11-02 DE DE8282903351T patent/DE3261072D1/de not_active Expired
- 1982-11-02 IT IT24026/82A patent/IT1153339B/it active
- 1982-11-02 EP EP82903351A patent/EP0092569B1/en not_active Expired
- 1982-11-02 AU AU91221/82A patent/AU553371B2/en not_active Ceased
- 1982-11-02 KR KR8204930A patent/KR870000629B1/ko active
-
1983
- 1983-06-17 FI FI832229A patent/FI73104C/fi not_active IP Right Cessation
- 1983-06-30 DK DK3017/83A patent/DK301783D0/da not_active Application Discontinuation
- 1983-07-01 NO NO83832421A patent/NO157239C/no unknown
-
1985
- 1985-12-30 MY MY1004/85A patent/MY100485A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NO157239B (no) | 1987-11-02 |
WO1983001715A1 (en) | 1983-05-11 |
EP0092569A1 (en) | 1983-11-02 |
YU244382A (en) | 1985-03-20 |
ES8308178A1 (es) | 1983-08-01 |
MY100485A (en) | 1985-12-31 |
NO157239C (no) | 1988-02-10 |
IT1153339B (it) | 1987-01-14 |
KR840002599A (ko) | 1984-07-02 |
AU553371B2 (en) | 1986-07-10 |
IT8224026A0 (it) | 1982-11-02 |
BR8207952A (pt) | 1983-10-04 |
NO832421L (no) | 1983-07-01 |
IE822606L (en) | 1983-05-02 |
MX152128A (es) | 1985-05-30 |
ES516966A0 (es) | 1983-08-01 |
IE53760B1 (en) | 1989-02-01 |
FI73104C (fi) | 1987-08-10 |
KR870000629B1 (ko) | 1987-03-26 |
FI832229A0 (fi) | 1983-06-17 |
DK301783A (da) | 1983-06-30 |
SE426765B (sv) | 1983-02-07 |
FI832229L (fi) | 1983-06-17 |
DE3261072D1 (en) | 1984-11-29 |
US4571719A (en) | 1986-02-18 |
DK301783D0 (da) | 1983-06-30 |
EP0092569B1 (en) | 1984-10-24 |
AU9122182A (en) | 1983-05-18 |
JPS58501849A (ja) | 1983-10-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed |
Owner name: OY L M ERICSSON AB |