FR2501436A1 - - Google Patents
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- Publication number
- FR2501436A1 FR2501436A1 FR8203500A FR8203500A FR2501436A1 FR 2501436 A1 FR2501436 A1 FR 2501436A1 FR 8203500 A FR8203500 A FR 8203500A FR 8203500 A FR8203500 A FR 8203500A FR 2501436 A1 FR2501436 A1 FR 2501436A1
- Authority
- FR
- France
- Prior art keywords
- signal
- average absolute
- absolute value
- circuit
- adaptive filter
- 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.)
- Granted
Links
- 230000003044 adaptive effect Effects 0.000 claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims 1
- 230000006870 function Effects 0.000 description 16
- 230000004044 response Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002592 echocardiography Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 235000005822 corn Nutrition 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
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001755 vocal effect 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)
- Filters That Use Time-Delay Elements (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/240,977 US4491701A (en) | 1981-03-05 | 1981-03-05 | Adaptive filter including a far end energy discriminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2501436A1 true FR2501436A1 (OSRAM) | 1982-09-10 |
| FR2501436B1 FR2501436B1 (OSRAM) | 1985-07-26 |
Family
ID=22908700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR828203500A Expired FR2501436B1 (OSRAM) | 1981-03-05 | 1982-03-03 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4491701A (OSRAM) |
| JP (1) | JPS58500309A (OSRAM) |
| BE (1) | BE892355A (OSRAM) |
| CA (1) | CA1169135A (OSRAM) |
| DE (1) | DE3235914T1 (OSRAM) |
| FR (1) | FR2501436B1 (OSRAM) |
| GB (1) | GB2095518B (OSRAM) |
| IT (1) | IT1150252B (OSRAM) |
| NL (1) | NL8220077A (OSRAM) |
| WO (1) | WO1982003145A1 (OSRAM) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467441A (en) * | 1982-10-08 | 1984-08-21 | At&T Bell Laboratories | Adaptive filter including controlled tap coefficient leakage |
| US4584441A (en) * | 1984-09-07 | 1986-04-22 | At&T Bell Laboratories | Bidirectional adaptive voice frequency repeater |
| US4712235A (en) * | 1984-11-19 | 1987-12-08 | International Business Machines Corporation | Method and apparatus for improved control and time sharing of an echo canceller |
| US4773034A (en) * | 1985-05-09 | 1988-09-20 | American Telephone And Telegraph Company | Adaptive equalizer utilizing a plurality of multiplier-accumulator devices |
| CA1242541A (en) * | 1985-11-25 | 1988-09-27 | Dany Sylvain | Echo cancellation in two-wire transmission path repeaters |
| EP0307765A1 (de) * | 1987-09-18 | 1989-03-22 | Siemens Aktiengesellschaft | Anordnung zum Erkennen periodischer Signale für einen Sprach-Echokompensator |
| US5023819A (en) * | 1989-06-02 | 1991-06-11 | Halliburton Company | Linear shaped filter |
| JP3135902B2 (ja) * | 1990-05-11 | 2001-02-19 | 株式会社日立製作所 | 自動等化器及び半導体集積回路 |
| DE59009303D1 (de) * | 1990-12-17 | 1995-07-27 | Siemens Ag | Adaptives Balancefilter. |
| JP3176474B2 (ja) * | 1992-06-03 | 2001-06-18 | 沖電気工業株式会社 | 適応ノイズキャンセラ装置 |
| FI935834L (fi) * | 1993-12-23 | 1995-06-24 | Nokia Telecommunications Oy | Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa |
| US5666429A (en) * | 1994-07-18 | 1997-09-09 | Motorola, Inc. | Energy estimator and method therefor |
| JPH08265224A (ja) * | 1995-03-22 | 1996-10-11 | Nec Corp | エコーキャンセラ |
| SE505152C2 (sv) * | 1995-10-11 | 1997-07-07 | Ericsson Telefon Ab L M | Adaptivt ekosläckningsförfarande |
| SE517602C2 (sv) | 1995-10-20 | 2002-06-25 | Ericsson Telefon Ab L M | Fastlåst loop |
| US6097820A (en) * | 1996-12-23 | 2000-08-01 | Lucent Technologies Inc. | System and method for suppressing noise in digitally represented voice signals |
| US6185300B1 (en) * | 1996-12-31 | 2001-02-06 | Ericsson Inc. | Echo canceler for use in communications system |
| US5951626A (en) * | 1997-10-17 | 1999-09-14 | Lucent Technologies Inc. | Adaptive filter |
| DE19925046A1 (de) * | 1999-06-01 | 2001-05-03 | Alcatel Sa | Verfahren und Vorrichtung zur Unterdrückung von Rauschen und Echos |
| US6813352B1 (en) | 1999-09-10 | 2004-11-02 | Lucent Technologies Inc. | Quadrature filter augmentation of echo canceler basis functions |
| US6351531B1 (en) * | 2000-01-21 | 2002-02-26 | Motorola, Inc. | Method and system for controlling echo cancellation using zero echo path, ringing, and off-hook detection |
| JP3860556B2 (ja) | 2003-04-04 | 2006-12-20 | 松下電器産業株式会社 | 基地局装置及び通信方法 |
| WO2007048682A1 (de) * | 2005-10-25 | 2007-05-03 | Anocsys Ag | Verfahren zum bestimmen einer übertragungsfunktion sowie eine vorrichtung zur durchführung des verfahrens |
| US7548791B1 (en) | 2006-05-18 | 2009-06-16 | Adobe Systems Incorporated | Graphically displaying audio pan or phase information |
| US8532802B1 (en) | 2008-01-18 | 2013-09-10 | Adobe Systems Incorporated | Graphic phase shifter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3499999A (en) * | 1966-10-31 | 1970-03-10 | Bell Telephone Labor Inc | Closed loop adaptive echo canceller using generalized filter networks |
| US3937899A (en) * | 1975-01-30 | 1976-02-10 | Bell Telephone Laboratories, Incorporated | Tone detector using spectrum parameter estimation |
| US4129753A (en) * | 1977-12-09 | 1978-12-12 | Bell Telephone Laboratories, Incorporated | Echo canceller using feedback to improve speech detector performance |
| GB2008903A (en) * | 1977-08-17 | 1979-06-06 | Gen Electric Co Ltd | Echo suppressors |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3500000A (en) * | 1966-10-31 | 1970-03-10 | Myldred P Kelly | Self-adaptive echo canceller |
| US4028506A (en) * | 1973-12-12 | 1977-06-07 | Nippon Electric Company, Ltd. | Maximum value tracing circuit for digitized voice signals |
| US3927260A (en) * | 1974-05-07 | 1975-12-16 | Atlantic Res Corp | Signal identification system |
| US4028496A (en) * | 1976-08-17 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Digital speech detector |
| US4072830A (en) * | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
-
1981
- 1981-03-05 US US06/240,977 patent/US4491701A/en not_active Expired - Lifetime
-
1982
- 1982-02-24 WO PCT/US1982/000229 patent/WO1982003145A1/en not_active Ceased
- 1982-02-24 JP JP57501019A patent/JPS58500309A/ja active Granted
- 1982-02-24 NL NL8220077A patent/NL8220077A/nl unknown
- 1982-02-24 DE DE823235914T patent/DE3235914T1/de active Granted
- 1982-03-03 GB GB8206173A patent/GB2095518B/en not_active Expired
- 1982-03-03 FR FR828203500A patent/FR2501436B1/fr not_active Expired
- 1982-03-04 IT IT19971/82A patent/IT1150252B/it active
- 1982-03-04 CA CA000397583A patent/CA1169135A/en not_active Expired
- 1982-03-04 BE BE0/207462A patent/BE892355A/fr not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3499999A (en) * | 1966-10-31 | 1970-03-10 | Bell Telephone Labor Inc | Closed loop adaptive echo canceller using generalized filter networks |
| US3937899A (en) * | 1975-01-30 | 1976-02-10 | Bell Telephone Laboratories, Incorporated | Tone detector using spectrum parameter estimation |
| GB2008903A (en) * | 1977-08-17 | 1979-06-06 | Gen Electric Co Ltd | Echo suppressors |
| US4129753A (en) * | 1977-12-09 | 1978-12-12 | Bell Telephone Laboratories, Incorporated | Echo canceller using feedback to improve speech detector performance |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1150252B (it) | 1986-12-10 |
| FR2501436B1 (OSRAM) | 1985-07-26 |
| NL8220077A (nl) | 1983-02-01 |
| CA1169135A (en) | 1984-06-12 |
| JPH0480569B2 (OSRAM) | 1992-12-18 |
| GB2095518B (en) | 1985-01-30 |
| US4491701A (en) | 1985-01-01 |
| IT8219971A0 (it) | 1982-03-04 |
| BE892355A (fr) | 1982-07-01 |
| WO1982003145A1 (en) | 1982-09-16 |
| DE3235914C2 (OSRAM) | 1987-06-04 |
| DE3235914T1 (de) | 1983-11-17 |
| GB2095518A (en) | 1982-09-29 |
| JPS58500309A (ja) | 1983-02-24 |
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| FR2501436A1 (OSRAM) | ||
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ER | Errata listed in the french official journal (bopi) | ||
| ST | Notification of lapse |