SE426763B - Digital ekoeliminator for ett modem for dataoverforing genom modulation av en bervag - Google Patents
Digital ekoeliminator for ett modem for dataoverforing genom modulation av en bervagInfo
- Publication number
- SE426763B SE426763B SE7800390A SE7800390A SE426763B SE 426763 B SE426763 B SE 426763B SE 7800390 A SE7800390 A SE 7800390A SE 7800390 A SE7800390 A SE 7800390A SE 426763 B SE426763 B SE 426763B
- Authority
- SE
- Sweden
- Prior art keywords
- filter
- carrier
- echo canceller
- numbers
- filters
- Prior art date
Links
- 230000003044 adaptive effect Effects 0.000 claims description 94
- 230000006870 function Effects 0.000 claims description 47
- 230000004044 response Effects 0.000 claims description 46
- 230000015654 memory Effects 0.000 claims description 41
- 238000004364 calculation method Methods 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 23
- 230000014509 gene expression Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920006384 Airco Polymers 0.000 description 1
- 241000394848 Quercus phillyraeoides Species 0.000 description 1
- FTAFBCWHLFKBFJ-UHFFFAOYSA-N aluminum;2-methyl-1,3,5-trinitrobenzene;1,3,5,7-tetranitro-1,3,5,7-tetrazocane Chemical compound [Al].CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O.[O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 FTAFBCWHLFKBFJ-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7701197A FR2377734A1 (fr) | 1977-01-17 | 1977-01-17 | Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse |
| FR7718342A FR2394938A2 (fr) | 1977-06-15 | 1977-06-15 | Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7800390L SE7800390L (sv) | 1978-07-18 |
| SE426763B true SE426763B (sv) | 1983-02-07 |
Family
ID=26219806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7800390A SE426763B (sv) | 1977-01-17 | 1978-01-13 | Digital ekoeliminator for ett modem for dataoverforing genom modulation av en bervag |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4162378A (en, 2012) |
| JP (1) | JPS5390712A (en, 2012) |
| AU (1) | AU514263B2 (en, 2012) |
| DE (1) | DE2801375C3 (en, 2012) |
| IT (1) | IT1091970B (en, 2012) |
| NL (1) | NL7800408A (en, 2012) |
| SE (1) | SE426763B (en, 2012) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1115559B (it) * | 1978-08-29 | 1986-02-03 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per la cancellazione numerica dell eco |
| FR2448258A1 (fr) * | 1979-02-05 | 1980-08-29 | Trt Telecom Radio Electr | Systeme de test d'un dispositif muni d'un annuleur d'echo |
| NL7903759A (nl) * | 1979-05-14 | 1980-11-18 | Philips Nv | Echocompensator met hoogdoorlaatfilter. |
| DE2920575C2 (de) * | 1979-05-21 | 1981-09-17 | Siemens AG, 1000 Berlin und 8000 München | Digital-Fernmeldesystem mit mindestens einem Vierdrahtleitungsabschnitt |
| FR2460075B1 (fr) * | 1979-06-22 | 1988-12-09 | Cit Alcatel | Annuleur d'echo adaptatif pour transmission de donnees en duplex |
| FR2475322A1 (fr) * | 1980-02-01 | 1981-08-07 | Trt Telecom Radio Electr | Annuleur d'echo a circuits de calcul simplifies |
| FR2487144B1 (fr) * | 1980-07-21 | 1986-10-24 | Trt Telecom Radio Electr | Dispositif d'annulation d'un signal d'echo composite |
| CA1180141A (en) * | 1980-11-15 | 1984-12-27 | Kenzo Takahashi | Echo canceller system |
| US4464545A (en) * | 1981-07-13 | 1984-08-07 | Bell Telephone Laboratories, Incorporated | Echo canceller |
| DE3129343C2 (de) * | 1981-07-24 | 1987-01-29 | Siemens AG, 1000 Berlin und 8000 München | Adaptiver Entzerrer für ein demoduliertes QAM-Signal |
| SE426764B (sv) * | 1981-11-02 | 1983-02-07 | Ellemtel Utvecklings Ab | Forfarande att astadkomma adaptiv ekoeliminering vid overforing av digital information i duplex jemte anordning for utforande av forfarandet |
| SE426765B (sv) * | 1981-11-02 | 1983-02-07 | Ellemtel Utvecklings Ab | Balansfilter av fir-typ ingaende i sendar-mottagarenheten i ett telekommunikationssystem |
| FR2517905B1 (fr) * | 1981-12-09 | 1985-11-29 | Telecommunications Sa | Dispositif d'initialisation pour annuleur d'echo et son application aux echos lointains |
| FR2528642B1 (fr) * | 1982-06-11 | 1985-10-25 | Cit Alcatel | Annuleur d'echo pour transmission de donnees |
| US4669116A (en) * | 1982-12-09 | 1987-05-26 | Regents Of The University Of California | Non-linear echo cancellation of data signals |
| FR2540314A1 (fr) * | 1983-01-31 | 1984-08-03 | Trt Telecom Radio Electr | Procede d'initialisation des coefficients de filtres dans un dispositif d'annulation d'echos proche et lointain et dispositif de mise en oeuvre de ce procede |
| US4594479A (en) * | 1983-08-18 | 1986-06-10 | At&T Information Systems Inc. Bell Telephone Laboratories, Inc. | Fast start-up of adaptive echo canceler or echo measurement device |
| US4682358A (en) * | 1984-12-04 | 1987-07-21 | American Telephone And Telegraph Company | Echo canceller |
| JPH0616592B2 (ja) * | 1985-12-23 | 1994-03-02 | 富士通株式会社 | Ｆｄｍモデム |
| JPS62150416U (en, 2012) * | 1986-03-17 | 1987-09-24 | ||
| US4849945A (en) * | 1986-12-08 | 1989-07-18 | Tomex Corporation | Seismic processing and imaging with a drill-bit source |
| US4989221A (en) * | 1987-03-30 | 1991-01-29 | Codex Corporation | Sample rate converter |
| JP2518394B2 (ja) * | 1989-05-24 | 1996-07-24 | 日本電気株式会社 | エコ―キャンセラ方式全二重送受信回路 |
| US5487109A (en) * | 1994-05-17 | 1996-01-23 | Bellsouth Corporation | End office of a telephone system with a zero loss plan |
| US6078645A (en) * | 1997-02-20 | 2000-06-20 | Lucent Technologies Inc. | Apparatus and method for monitoring full duplex data communications |
| GB2482442B (en) * | 2009-03-17 | 2015-04-29 | Skyworks Solutions Inc | Saw-less, LNA-less lwo noise receiver |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3732410A (en) * | 1969-12-22 | 1973-05-08 | Postmaster Department Res Labo | Self adaptive filter and control circuit therefor |
| JPS5226973B2 (en, 2012) * | 1973-01-19 | 1977-07-18 | ||
| US4087654A (en) * | 1975-11-28 | 1978-05-02 | Bell Telephone Laboratories, Incorporated | Echo canceller for two-wire full duplex data transmission |
| NL170688C (nl) * | 1976-06-28 | 1982-12-01 | Philips Nv | Inrichting voor simultane tweerichtingsdatatransmissie over tweedraadsverbindingen. |
| US4074086A (en) * | 1976-09-07 | 1978-02-14 | Bell Telephone Laboratories, Incorporated | Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission |
| US4072830A (en) * | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
-
1978
- 1978-01-13 AU AU32430/78A patent/AU514263B2/en not_active Expired
- 1978-01-13 SE SE7800390A patent/SE426763B/sv not_active IP Right Cessation
- 1978-01-13 DE DE2801375A patent/DE2801375C3/de not_active Expired
- 1978-01-13 NL NL7800408A patent/NL7800408A/xx not_active Application Discontinuation
- 1978-01-13 IT IT19251/78A patent/IT1091970B/it active
- 1978-01-16 US US05/869,508 patent/US4162378A/en not_active Expired - Lifetime
- 1978-01-17 JP JP285878A patent/JPS5390712A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5390712A (en) | 1978-08-09 |
| NL7800408A (nl) | 1978-07-19 |
| JPS618618B2 (en, 2012) | 1986-03-15 |
| DE2801375C3 (de) | 1982-01-28 |
| DE2801375A1 (de) | 1978-07-20 |
| DE2801375B2 (de) | 1981-05-14 |
| AU514263B2 (en) | 1981-01-29 |
| SE7800390L (sv) | 1978-07-18 |
| IT1091970B (it) | 1985-07-06 |
| IT7819251A0 (it) | 1978-01-13 |
| US4162378A (en) | 1979-07-24 |
| AU3243078A (en) | 1979-07-19 |
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| NAL | Patent in force |
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