GB1580821A - Digital echo canceller for a modem for data transmission by means of modulation of a carrier - Google Patents
Digital echo canceller for a modem for data transmission by means of modulation of a carrier Download PDFInfo
- Publication number
- GB1580821A GB1580821A GB142978A GB142978A GB1580821A GB 1580821 A GB1580821 A GB 1580821A GB 142978 A GB142978 A GB 142978A GB 142978 A GB142978 A GB 142978A GB 1580821 A GB1580821 A GB 1580821A
- Authority
- GB
- United Kingdom
- Prior art keywords
- numbers
- carrier
- filter
- filters
- echo canceler
- 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
- 230000005540 biological transmission Effects 0.000 title claims description 22
- 230000003044 adaptive effect Effects 0.000 claims description 99
- 230000006870 function Effects 0.000 claims description 45
- 230000004044 response Effects 0.000 claims description 45
- 230000015654 memory Effects 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 15
- 230000008901 benefit Effects 0.000 claims description 3
- 230000014509 gene expression Effects 0.000 description 108
- 238000010586 diagram Methods 0.000 description 26
- 230000008569 process Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- FIVPIPIDMRVLAY-UHFFFAOYSA-N aspergillin Natural products C1C2=CC=CC(O)C2N2C1(SS1)C(=O)N(C)C1(CO)C2=O FIVPIPIDMRVLAY-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 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
- 230000009467 reduction Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 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)
- Bidirectional Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1580821A true GB1580821A (en) | 1980-12-03 |
Family
ID=9185558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB142978A Expired GB1580821A (en) | 1977-01-17 | 1978-01-13 | Digital echo canceller for a modem for data transmission by means of modulation of a carrier |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE862951A (enExample) |
| FR (1) | FR2377734A1 (enExample) |
| GB (1) | GB1580821A (enExample) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
| CN117172163A (zh) * | 2023-08-15 | 2023-12-05 | 重庆西南集成电路设计有限责任公司 | 幅相控制电路的幅相二维优化方法、系统、介质及电子设备 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2475322A1 (fr) * | 1980-02-01 | 1981-08-07 | Trt Telecom Radio Electr | Annuleur d'echo a circuits de calcul simplifies |
| FR2490901A1 (fr) * | 1980-09-19 | 1982-03-26 | Trt Telecom Radio Electr | Annuleur d'echo numerique muni d'un convertisseur analogique-numerique a dynamique reglable |
-
1977
- 1977-01-17 FR FR7701197A patent/FR2377734A1/fr active Granted
-
1978
- 1978-01-13 GB GB142978A patent/GB1580821A/en not_active Expired
- 1978-01-16 BE BE184361A patent/BE862951A/xx not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
| CN117172163A (zh) * | 2023-08-15 | 2023-12-05 | 重庆西南集成电路设计有限责任公司 | 幅相控制电路的幅相二维优化方法、系统、介质及电子设备 |
| CN117172163B (zh) * | 2023-08-15 | 2024-04-12 | 重庆西南集成电路设计有限责任公司 | 幅相控制电路的幅相二维优化方法、系统、介质及电子设备 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2377734B1 (enExample) | 1980-11-21 |
| FR2377734A1 (fr) | 1978-08-11 |
| BE862951A (fr) | 1978-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19980112 |