FI925294A0 - FRAMEWORK FOR RETURN ATTACHED TO RESTEKO-BEGRAENSARE - Google Patents
FRAMEWORK FOR RETURN ATTACHED TO RESTEKO-BEGRAENSAREInfo
- Publication number
- FI925294A0 FI925294A0 FI925294A FI925294A FI925294A0 FI 925294 A0 FI925294 A0 FI 925294A0 FI 925294 A FI925294 A FI 925294A FI 925294 A FI925294 A FI 925294A FI 925294 A0 FI925294 A0 FI 925294A0
- Authority
- FI
- Finland
- Prior art keywords
- echo
- nlp
- residual
- threshold
- limiter
- Prior art date
Links
- 238000002592 echocardiography Methods 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 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)
- Toys (AREA)
- Massaging Devices (AREA)
- Control Of Electric Motors In General (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
- Filters That Use Time-Delay Elements (AREA)
Abstract
In a digital echo canceller (EK) with residual-echo limiter (NLP), a threshold (Sa) is derived from the signal on the receiving path (EW), with which the level (PSWA) at the input of the residual-echo limiter (NLP) is compared. If the level (PSWA) is lower than the threshold (Sa), the path of the residual-echo limiter (NLP) is blocked. If not, it is opened. Since this threshold (Sa) is only derived for the echo passing via the adjacent hybrid, the residual-echo limiter (NLP) cannot respond to other echoes to the same receiving-path signal. Therefore, the rising total echo attenuation is measured from the beginning of a call and when a defined value is reached, the arrangement switches to a different threshold (Se) which is obtained by subtraction of the canceller attenuation (ACANC) from an artificial echo level (Py) which is derived from the digital filter (AFI) and a logarithmating unit (LG2). <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4138463 | 1991-11-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI925294A0 true FI925294A0 (en) | 1992-11-20 |
| FI925294A FI925294A (en) | 1993-05-23 |
Family
ID=6445376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI925294A FI925294A (en) | 1991-11-22 | 1992-11-20 | Foerfarande and anordning Foer att styra en resteko-begraensare |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0543274B1 (en) |
| AT (1) | ATE166195T1 (en) |
| BR (1) | BR9204461A (en) |
| DE (1) | DE59209323D1 (en) |
| FI (1) | FI925294A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746494B (en) * | 2020-05-15 | 2022-10-18 | 华为技术有限公司 | Echo cancellation method and transceiver |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2564667B1 (en) * | 1984-05-15 | 1986-09-19 | Trt Telecom Radio Electr | DEVICE FOR CONTROLLING AN ECHO CANCELER AND A CENTER SCREENER |
-
1992
- 1992-11-11 DE DE59209323T patent/DE59209323D1/en not_active Expired - Fee Related
- 1992-11-11 AT AT92119302T patent/ATE166195T1/en not_active IP Right Cessation
- 1992-11-11 EP EP92119302A patent/EP0543274B1/en not_active Expired - Lifetime
- 1992-11-19 BR BR929204461A patent/BR9204461A/en not_active Application Discontinuation
- 1992-11-20 FI FI925294A patent/FI925294A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI925294A (en) | 1993-05-23 |
| EP0543274A2 (en) | 1993-05-26 |
| EP0543274A3 (en) | 1994-07-27 |
| EP0543274B1 (en) | 1998-05-13 |
| BR9204461A (en) | 1993-05-25 |
| ATE166195T1 (en) | 1998-05-15 |
| DE59209323D1 (en) | 1998-06-18 |
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