JPH0142533B2 - - Google Patents
Info
- Publication number
- JPH0142533B2 JPH0142533B2 JP56146487A JP14648781A JPH0142533B2 JP H0142533 B2 JPH0142533 B2 JP H0142533B2 JP 56146487 A JP56146487 A JP 56146487A JP 14648781 A JP14648781 A JP 14648781A JP H0142533 B2 JPH0142533 B2 JP H0142533B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- echo
- residual
- digital
- circuit
- 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 claims description 40
- 230000004044 response Effects 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 description 25
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8020251A FR2490901A1 (fr) | 1980-09-19 | 1980-09-19 | Annuleur d'echo numerique muni d'un convertisseur analogique-numerique a dynamique reglable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5783936A JPS5783936A (en) | 1982-05-26 |
| JPH0142533B2 true JPH0142533B2 (enExample) | 1989-09-13 |
Family
ID=9246120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56146487A Granted JPS5783936A (en) | 1980-09-19 | 1981-09-18 | Echo cancelling device |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4549048A (enExample) |
| EP (1) | EP0048515B1 (enExample) |
| JP (1) | JPS5783936A (enExample) |
| AU (1) | AU548564B2 (enExample) |
| CA (1) | CA1181148A (enExample) |
| DE (1) | DE3162893D1 (enExample) |
| FR (1) | FR2490901A1 (enExample) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5912639A (ja) * | 1982-07-12 | 1984-01-23 | Toshiba Corp | エコ−キヤンセラ |
| FR2534427A1 (fr) * | 1982-10-11 | 1984-04-13 | Trt Telecom Radio Electr | Annuleur d'echo pour signal de donnees en bande de base |
| FR2534754A1 (fr) * | 1982-10-15 | 1984-04-20 | Trt Telecom Radio Electr | Recepteur pour modem de transmission de donnees, comportant un annuleur d'echo et un egaliseur |
| LU85402A1 (de) * | 1983-12-01 | 1984-09-11 | Siemens Ag | Verfahren und schaltungsanordnung zur kompensation von uebersprech-u./o.echosignalen |
| US4747132A (en) * | 1984-04-09 | 1988-05-24 | Matsushita Electric Industrial Co., Ltd. | Howling canceller |
| US4610010A (en) * | 1984-12-10 | 1986-09-02 | Ncr Corporation | Control circuit for an adaptive hybrid control in a local area network |
| US4742510A (en) * | 1986-04-04 | 1988-05-03 | Massachusetts Institute Of Technology | Near and far echo canceller for data communications |
| US4989221A (en) * | 1987-03-30 | 1991-01-29 | Codex Corporation | Sample rate converter |
| GB8719307D0 (en) * | 1987-08-14 | 1987-09-23 | Gen Electric Co Plc | Echo canceller |
| EP0313706B1 (en) * | 1987-10-30 | 1992-04-29 | International Business Machines Corporation | Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same |
| JPH01284010A (ja) * | 1988-01-21 | 1989-11-15 | Codex Corp | ディジタル・フィルタ |
| US5592548A (en) * | 1995-05-31 | 1997-01-07 | Qualcomm Incorporated | System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process |
| US7702004B2 (en) * | 2002-12-09 | 2010-04-20 | Alexander Roger Deas | Simultaneous bidirectional differential signalling interface |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3836734A (en) * | 1971-12-03 | 1974-09-17 | Communications Satellite Corp | Adaptive echo canceller with multi-increment gain coefficient corrections |
| JPS5218132A (en) * | 1975-08-01 | 1977-02-10 | Hitachi Ltd | Binary circuit |
| FR2358790A1 (fr) * | 1976-07-13 | 1978-02-10 | Trt Telecom Radio Electr | Annuleur d'echo auto-adaptatif pour transmission de donnees en bande de base |
| FR2377734A1 (fr) * | 1977-01-17 | 1978-08-11 | Trt Telecom Radio Electr | Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse |
| US4113997A (en) * | 1977-07-12 | 1978-09-12 | Communications Satellite, Corporation | Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same |
| US4268727A (en) * | 1979-03-14 | 1981-05-19 | International Telephone And Telegraph Corporation | Adaptive digital echo cancellation circuit |
| NL7902053A (nl) * | 1979-03-15 | 1980-09-17 | Philips Nv | Echocompensator voor homochrone data overdrachtssyste- men. |
| NL7903759A (nl) * | 1979-05-14 | 1980-11-18 | Philips Nv | Echocompensator met hoogdoorlaatfilter. |
-
1980
- 1980-09-19 FR FR8020251A patent/FR2490901A1/fr active Granted
-
1981
- 1981-09-11 EP EP81201014A patent/EP0048515B1/fr not_active Expired
- 1981-09-11 DE DE8181201014T patent/DE3162893D1/de not_active Expired
- 1981-09-15 CA CA000385879A patent/CA1181148A/en not_active Expired
- 1981-09-17 AU AU75434/81A patent/AU548564B2/en not_active Ceased
- 1981-09-18 JP JP56146487A patent/JPS5783936A/ja active Granted
-
1984
- 1984-02-22 US US06/581,220 patent/US4549048A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2490901A1 (fr) | 1982-03-26 |
| AU7543481A (en) | 1982-03-25 |
| CA1181148A (en) | 1985-01-15 |
| FR2490901B1 (enExample) | 1984-02-10 |
| EP0048515A1 (fr) | 1982-03-31 |
| DE3162893D1 (en) | 1984-05-03 |
| EP0048515B1 (fr) | 1984-03-28 |
| JPS5783936A (en) | 1982-05-26 |
| AU548564B2 (en) | 1985-12-19 |
| US4549048A (en) | 1985-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4362909A (en) | Echo canceler with high-pass filter | |
| US4999830A (en) | Communication system analog-to-digital converter using echo information to improve resolution | |
| US4995030A (en) | Far end echo cancellation method and apparatus | |
| JPH0142533B2 (enExample) | ||
| JP3454883B2 (ja) | 適応エコーコントローラを制御するための非相関制御システム | |
| US6434233B1 (en) | Method and apparatus for canceling periodic interference signals in a digital data communication system | |
| JPH07114403B2 (ja) | データ伝送装置における同期維持方法 | |
| CA1251269A (en) | Noise cancellation | |
| US4334128A (en) | Echo canceler for homochronous data transmission systems | |
| JPS59139732A (ja) | ベ−スバンドデ−タ信号のエコ−キヤンセラ | |
| JPS5994928A (ja) | デ−タ伝送モデムで使用される受信機 | |
| EP0065796B1 (en) | Arrangement for cancelling echo signals | |
| JPS59225626A (ja) | デ−タ伝送装置用エコ−キヤンセラ装置 | |
| GB2164827A (en) | Method of cancelling echoes in full-duplex data transmission system | |
| US4411006A (en) | Digital bit rate synchronizer for digital echo cancellers and similar signal processing devices | |
| JPH039655B2 (enExample) | ||
| JPH0457136B2 (enExample) | ||
| US4584441A (en) | Bidirectional adaptive voice frequency repeater | |
| US6181791B1 (en) | Apparatus and method for reducing local interference in subscriber loop communication system | |
| CA1213088A (en) | Echo canceller dynamic range extension | |
| JPS63232631A (ja) | 二方向アナログチャンネルでのデーター伝達用ターミナル | |
| US5341417A (en) | Integrated PCM-CODEC circuit with telemetering noise elimination | |
| JPS6035841A (ja) | エコー補償機能を有するライン回路 | |
| JPS62502581A (ja) | 適応反響消去と同時に符号間干渉による雑音の適応消去を行うデジタル等化フイルタを調節する方法及び装置 | |
| EP0202596B1 (en) | Improvements to the systems for bidirectional digital transmission with echo-cancellation |