AU2001259273A1 - Noise-adaptive communications signal gain - Google Patents
Noise-adaptive communications signal gainInfo
- Publication number
- AU2001259273A1 AU2001259273A1 AU2001259273A AU5927301A AU2001259273A1 AU 2001259273 A1 AU2001259273 A1 AU 2001259273A1 AU 2001259273 A AU2001259273 A AU 2001259273A AU 5927301 A AU5927301 A AU 5927301A AU 2001259273 A1 AU2001259273 A1 AU 2001259273A1
- Authority
- AU
- Australia
- Prior art keywords
- noise
- communications device
- gain
- signal gain
- transmit signal
- 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.)
- Abandoned
Links
Classifications
-
- 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)
- Telephone Function (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Transceivers (AREA)
- Noise Elimination (AREA)
Abstract
A communications device employs noise-adaptive transmit signal gain that takes echo cancellation into account so that a remote listener engaged in conversation with a local user of the communications device is not subjected to overly loud received voice when the local user experiences high ambient noise. Because the noise environment for the local user comprises not only local background noise, but also noise received through the communications device from the remote user, the communications device employs echo cancellation to ensure the transmit signal gain adaptations are not erroneously influenced by remote noise. A gain associated with the transmit signal is adjusted based on estimated noise, with the noise estimate taking the effects of echo cancellation into account. By decreasing transmit signal gain in response to increasing local noise, the communications device may compensate for the increasing speech volume of the local user generally caused by an increase in local noise. In order to avoid abrupt, noticeable gain adjustments, the communications device may employ hysteresis between the noise level at which the transmit gain is reduced and the noise level at which it is increased. Further, the communications device may adjust transmit signal gain incrementally over a defined time period. Optionally, the communications device may increase receive signal gain in tandem with decreasing transmit signal gain, such that overall transmit/receive loop gain remains relatively constant.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57413900A | 2000-05-18 | 2000-05-18 | |
| US09574139 | 2000-05-18 | ||
| PCT/US2001/013910 WO2001089184A1 (en) | 2000-05-18 | 2001-04-30 | Noise-adaptive communications signal gain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2001259273A1 true AU2001259273A1 (en) | 2001-11-26 |
Family
ID=24294848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2001259273A Abandoned AU2001259273A1 (en) | 2000-05-18 | 2001-04-30 | Noise-adaptive communications signal gain |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1282978B1 (en) |
| AT (1) | ATE306781T1 (en) |
| AU (1) | AU2001259273A1 (en) |
| DE (1) | DE60113985T2 (en) |
| WO (1) | WO2001089184A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0021974D0 (en) * | 2000-09-07 | 2000-10-25 | Simoco Int Ltd | Echo reduction in two-way communication |
| DE602006018030D1 (en) * | 2006-11-24 | 2010-12-16 | Research In Motion Ltd | System and method for reducing uplink noise |
| US9058819B2 (en) | 2006-11-24 | 2015-06-16 | Blackberry Limited | System and method for reducing uplink noise |
| FR2932332B1 (en) * | 2008-06-04 | 2011-03-25 | Parrot | AUTOMATIC GAIN CONTROL SYSTEM APPLIED TO AN AUDIO SIGNAL BASED ON AMBIENT NOISE |
| JP5326533B2 (en) * | 2008-12-09 | 2013-10-30 | 富士通株式会社 | Voice processing apparatus and voice processing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2928130B2 (en) * | 1995-04-19 | 1999-08-03 | 埼玉日本電気株式会社 | Hands-free communication device |
| EP0895688B1 (en) * | 1997-01-23 | 2006-02-15 | Motorola, Inc. | Apparatus and method for non-linear processing in a communication system |
| AU3812497A (en) * | 1997-07-24 | 1999-02-16 | Qualcomm Incorporated | Method and apparatus for automatically adjusting speaker and microphone gains within a mobile telephone |
-
2001
- 2001-04-30 AU AU2001259273A patent/AU2001259273A1/en not_active Abandoned
- 2001-04-30 DE DE60113985T patent/DE60113985T2/en not_active Expired - Lifetime
- 2001-04-30 AT AT01932772T patent/ATE306781T1/en not_active IP Right Cessation
- 2001-04-30 WO PCT/US2001/013910 patent/WO2001089184A1/en active IP Right Grant
- 2001-04-30 EP EP01932772A patent/EP1282978B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE60113985T2 (en) | 2006-06-29 |
| EP1282978B1 (en) | 2005-10-12 |
| DE60113985D1 (en) | 2005-11-17 |
| ATE306781T1 (en) | 2005-10-15 |
| WO2001089184A1 (en) | 2001-11-22 |
| EP1282978A1 (en) | 2003-02-12 |
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