NZ299785A - Echo canceller digital filter transfer function updating - Google Patents
Echo canceller digital filter transfer function updatingInfo
- Publication number
- NZ299785A NZ299785A NZ299785A NZ29978596A NZ299785A NZ 299785 A NZ299785 A NZ 299785A NZ 299785 A NZ299785 A NZ 299785A NZ 29978596 A NZ29978596 A NZ 29978596A NZ 299785 A NZ299785 A NZ 299785A
- Authority
- NZ
- New Zealand
- Prior art keywords
- echo
- block
- transfer function
- correlation
- digital filter
- Prior art date
Links
- 238000012546 transfer Methods 0.000 title claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 16
- 230000006870 function Effects 0.000 description 19
- 238000002592 echocardiography Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010219 correlation analysis Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using 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)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Radar Systems Or Details Thereof (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19543666A DE19543666A1 (de) | 1995-11-23 | 1995-11-23 | Echokompensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ299785A true NZ299785A (en) | 1998-07-28 |
Family
ID=7778213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ299785A NZ299785A (en) | 1995-11-23 | 1996-11-20 | Echo canceller digital filter transfer function updating |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5799078A (cg-RX-API-DMAC10.html) |
| EP (1) | EP0776118B1 (cg-RX-API-DMAC10.html) |
| JP (1) | JPH09275368A (cg-RX-API-DMAC10.html) |
| AT (1) | ATE185034T1 (cg-RX-API-DMAC10.html) |
| AU (1) | AU719761B2 (cg-RX-API-DMAC10.html) |
| CA (1) | CA2191118A1 (cg-RX-API-DMAC10.html) |
| DE (2) | DE19543666A1 (cg-RX-API-DMAC10.html) |
| ES (1) | ES2136958T3 (cg-RX-API-DMAC10.html) |
| NZ (1) | NZ299785A (cg-RX-API-DMAC10.html) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19850271A1 (de) * | 1998-10-31 | 2000-05-04 | Alcatel Sa | Verfahren zur Bestimmung eines Echokopplungsfaktors und der Echolaufzeit in einem bidirektionalen Telekommunikationssystem |
| US6754187B1 (en) | 2000-04-06 | 2004-06-22 | Inter-Tel, Inc. | Performance enhancement system for digital PBX |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8100650A (nl) * | 1981-02-11 | 1982-09-01 | Philips Nv | Inrichting voor het corrigeren van pulsvervorming bij homochrone datatransmissie. |
| DE3120639C2 (de) * | 1981-05-23 | 1986-10-23 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Anordnung zur adaptiven Löschung von Sprecherechos |
| GB2123258A (en) * | 1982-06-25 | 1984-01-25 | Philips Electronic Associated | Digital duplex communication system |
| GB2123259A (en) * | 1982-06-25 | 1984-01-25 | Philips Electronic Associated | Digital duplex communication system |
| DE3431141A1 (de) * | 1984-08-24 | 1986-03-06 | Siemens Ag | Transversalfilter-echokompensator fuer lange akustische echos |
| GB8719307D0 (en) * | 1987-08-14 | 1987-09-23 | Gen Electric Co Plc | Echo canceller |
| DE3730234A1 (de) * | 1987-09-09 | 1989-03-30 | Telefonbau & Normalzeit Gmbh | Verfahren zur echounterdrueckung |
| GB2225517B (en) * | 1988-11-26 | 1993-03-31 | Motorola Inc | Telephone circuits |
| CA2004379C (en) * | 1988-12-01 | 1993-07-06 | Tetsu Taguchi | Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients |
| ATE115794T1 (de) * | 1989-05-12 | 1994-12-15 | Plessey Semiconductors Ltd | Schaltung zur audiosignalverarbeitung. |
| US5146494A (en) * | 1989-07-31 | 1992-09-08 | At&T Bell Laboratories | Overlapping look-up-and-add echo canceller requiring a smaller memory size |
| US4977591A (en) * | 1989-11-17 | 1990-12-11 | Nynex Corporation | Dual mode LMS nonlinear data echo canceller |
| JPH03173229A (ja) * | 1989-12-01 | 1991-07-26 | Nec Corp | 双方向通話状態検出方式 |
| NL9002790A (nl) * | 1990-12-18 | 1992-07-16 | Philips Nv | Echocompensator met verbeterde dubbelspraak detectie. |
| EP0530423B1 (en) * | 1991-09-06 | 1996-12-11 | International Business Machines Corporation | Adaptive echo cancellation method and device for implementing said method |
| EP0582403B1 (en) * | 1992-07-27 | 1997-12-10 | Texaco Development Corporation | Hydrotreating of cracked naptha |
| US5307405A (en) * | 1992-09-25 | 1994-04-26 | Qualcomm Incorporated | Network echo canceller |
| JPH06216811A (ja) * | 1993-01-20 | 1994-08-05 | Toshiba Corp | エコーキャンセラを備えた音声通信装置 |
| DE4305256A1 (de) * | 1993-02-20 | 1994-08-25 | Sel Alcatel Ag | Verfahren zum Verbessern der akustischen Rückhördämpfung von elektroakustischen Anlagen |
| FI935834A7 (fi) * | 1993-12-23 | 1995-06-24 | Nokia Corp | Menetelmä kaikukohtaan sovittautumiseksi kaiunpoistajassa |
| JP3359460B2 (ja) * | 1995-03-20 | 2002-12-24 | 沖電気工業株式会社 | 適応フィルタ及びエコーキャンセラ |
-
1995
- 1995-11-23 DE DE19543666A patent/DE19543666A1/de not_active Withdrawn
-
1996
- 1996-11-11 AU AU70685/96A patent/AU719761B2/en not_active Ceased
- 1996-11-13 US US08/748,340 patent/US5799078A/en not_active Expired - Lifetime
- 1996-11-20 NZ NZ299785A patent/NZ299785A/en unknown
- 1996-11-22 JP JP8311837A patent/JPH09275368A/ja active Pending
- 1996-11-22 CA CA002191118A patent/CA2191118A1/en not_active Abandoned
- 1996-11-22 DE DE59603143T patent/DE59603143D1/de not_active Expired - Lifetime
- 1996-11-22 AT AT96402514T patent/ATE185034T1/de not_active IP Right Cessation
- 1996-11-22 EP EP96402514A patent/EP0776118B1/de not_active Expired - Lifetime
- 1996-11-22 ES ES96402514T patent/ES2136958T3/es not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0776118B1 (de) | 1999-09-22 |
| AU7068596A (en) | 1997-05-29 |
| JPH09275368A (ja) | 1997-10-21 |
| EP0776118A3 (cg-RX-API-DMAC10.html) | 1997-06-25 |
| ES2136958T3 (es) | 1999-12-01 |
| CA2191118A1 (en) | 1997-05-24 |
| ATE185034T1 (de) | 1999-10-15 |
| EP0776118A2 (de) | 1997-05-28 |
| US5799078A (en) | 1998-08-25 |
| DE59603143D1 (de) | 1999-10-28 |
| AU719761B2 (en) | 2000-05-18 |
| DE19543666A1 (de) | 1997-05-28 |
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