WO2004043052A1 - Techniques for improving telephone audio quality - Google Patents
Techniques for improving telephone audio quality Download PDFInfo
- Publication number
- WO2004043052A1 WO2004043052A1 PCT/US2003/034452 US0334452W WO2004043052A1 WO 2004043052 A1 WO2004043052 A1 WO 2004043052A1 US 0334452 W US0334452 W US 0334452W WO 2004043052 A1 WO2004043052 A1 WO 2004043052A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- gain
- operable
- incoming
- outgoing
- Prior art date
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03779418A EP1574032A1 (en) | 2002-10-31 | 2003-10-29 | Techniques for improving telephone audio quality |
AU2003285102A AU2003285102A1 (en) | 2002-10-31 | 2003-10-29 | Techniques for improving telephone audio quality |
JP2004550237A JP2006505218A (en) | 2002-10-31 | 2003-10-29 | Technology to improve phone audio quality |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US42243002P | 2002-10-31 | 2002-10-31 | |
US60/422,430 | 2002-10-31 | ||
US10/696,239 | 2003-10-28 | ||
US10/696,239 US7433462B2 (en) | 2002-10-31 | 2003-10-28 | Techniques for improving telephone audio quality |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004043052A1 true WO2004043052A1 (en) | 2004-05-21 |
Family
ID=32179928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/034452 WO2004043052A1 (en) | 2002-10-31 | 2003-10-29 | Techniques for improving telephone audio quality |
Country Status (5)
Country | Link |
---|---|
US (1) | US7433462B2 (en) |
EP (1) | EP1574032A1 (en) |
JP (1) | JP2006505218A (en) |
AU (1) | AU2003285102A1 (en) |
WO (1) | WO2004043052A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1391106B1 (en) | 2001-04-30 | 2014-02-26 | Polycom, Inc. | Audio conference platform with dynamic speech detection threshold |
US20050285935A1 (en) * | 2004-06-29 | 2005-12-29 | Octiv, Inc. | Personal conferencing node |
US20110051923A1 (en) * | 2009-08-28 | 2011-03-03 | Texas Instruments Incorporated | Method, device, and computer-readable storage medium for producing digital side tone |
US8447595B2 (en) * | 2010-06-03 | 2013-05-21 | Apple Inc. | Echo-related decisions on automatic gain control of uplink speech signal in a communications device |
US9031838B1 (en) | 2013-07-15 | 2015-05-12 | Vail Systems, Inc. | Method and apparatus for voice clarity and speech intelligibility detection and correction |
KR101959097B1 (en) * | 2014-11-10 | 2019-03-15 | 에릭슨엘지엔터프라이즈 주식회사 | Method and apparatus for switching of extension call in the private branch exchange |
US9973633B2 (en) | 2014-11-17 | 2018-05-15 | At&T Intellectual Property I, L.P. | Pre-distortion system for cancellation of nonlinear distortion in mobile devices |
US10553235B2 (en) * | 2017-08-28 | 2020-02-04 | Apple Inc. | Transparent near-end user control over far-end speech enhancement processing |
US11430463B2 (en) * | 2018-07-12 | 2022-08-30 | Dolby Laboratories Licensing Corporation | Dynamic EQ |
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DE1920962B1 (en) * | 1969-04-24 | 1970-11-12 | Siemens Ag | Echo suppressor with two filter sets consisting of bandpasses working in parallel for a speech circuit on a four-wire transmission system |
US3567873A (en) * | 1966-12-24 | 1971-03-02 | Consiglio Nazionale Ricerche | Echo-suppression and noise-elimination system for telephone circuits |
US4991167A (en) * | 1987-08-22 | 1991-02-05 | Telenorma Telefonbau Und Normalzeit Gmbh | Voice controlled attenuation adjustment in telephone transmission circuits |
FR2678453A1 (en) * | 1991-06-27 | 1992-12-31 | Alcatel Business Systems | Telephone instrument with echo-cancellation device |
US5668794A (en) * | 1995-09-29 | 1997-09-16 | Crystal Semiconductor | Variable gain echo suppressor |
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WO2001050714A1 (en) * | 1999-12-30 | 2001-07-12 | Acoustic Technologies, Inc. | Band-by-band full duplex communication |
EP1229709A2 (en) * | 2001-01-22 | 2002-08-07 | Matsushita Electric Industrial Co., Ltd. | Echo sound signal suppressing apparatus |
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DE69428119T2 (en) | 1993-07-07 | 2002-03-21 | Picturetel Corp | REDUCING BACKGROUND NOISE FOR LANGUAGE ENHANCEMENT |
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FR2731123B1 (en) * | 1995-02-27 | 1997-05-09 | Prescom Sarl | SPEAKER GAIN CORRECTION FOR A HANDS-FREE TELEPHONE TERMINAL |
US5915235A (en) | 1995-04-28 | 1999-06-22 | Dejaco; Andrew P. | Adaptive equalizer preprocessor for mobile telephone speech coder to modify nonideal frequency response of acoustic transducer |
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US5778082A (en) | 1996-06-14 | 1998-07-07 | Picturetel Corporation | Method and apparatus for localization of an acoustic source |
US5832444A (en) | 1996-09-10 | 1998-11-03 | Schmidt; Jon C. | Apparatus for dynamic range compression of an audio signal |
US5943645A (en) | 1996-12-19 | 1999-08-24 | Northern Telecom Limited | Method and apparatus for computing measures of echo |
US6044162A (en) | 1996-12-20 | 2000-03-28 | Sonic Innovations, Inc. | Digital hearing aid using differential signal representations |
US6130943A (en) | 1996-12-23 | 2000-10-10 | Mci Communications Corporation | Method and apparatus for suppressing echo in telephony |
US5893056A (en) | 1997-04-17 | 1999-04-06 | Northern Telecom Limited | Methods and apparatus for generating noise signals from speech signals |
US6061405A (en) | 1997-12-15 | 2000-05-09 | Motorola, Inc. | Time domain source matched multicarrier quadrature amplitude modulation (QAM) method and apparatus |
US6038435A (en) | 1997-12-24 | 2000-03-14 | Nortel Networks Corporation | Variable step-size AGC |
US6282176B1 (en) | 1998-03-20 | 2001-08-28 | Cirrus Logic, Inc. | Full-duplex speakerphone circuit including a supplementary echo suppressor |
US6212273B1 (en) | 1998-03-20 | 2001-04-03 | Crystal Semiconductor Corporation | Full-duplex speakerphone circuit including a control interface |
US6351731B1 (en) | 1998-08-21 | 2002-02-26 | Polycom, Inc. | Adaptive filter featuring spectral gain smoothing and variable noise multiplier for noise reduction, and method therefor |
US6285767B1 (en) | 1998-09-04 | 2001-09-04 | Srs Labs, Inc. | Low-frequency audio enhancement system |
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US6324509B1 (en) | 1999-02-08 | 2001-11-27 | Qualcomm Incorporated | Method and apparatus for accurate endpointing of speech in the presence of noise |
US6381570B2 (en) | 1999-02-12 | 2002-04-30 | Telogy Networks, Inc. | Adaptive two-threshold method for discriminating noise from speech in a communication signal |
US6760435B1 (en) * | 2000-02-08 | 2004-07-06 | Lucent Technologies Inc. | Method and apparatus for network speech enhancement |
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US6795547B1 (en) * | 2000-08-02 | 2004-09-21 | Conexant Systems, Inc. | Full duplex speaker-phone providing increased loop stability |
JP3847558B2 (en) * | 2000-12-28 | 2006-11-22 | 株式会社日立製作所 | Fuel injection device for internal combustion engine |
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EP1391106B1 (en) | 2001-04-30 | 2014-02-26 | Polycom, Inc. | Audio conference platform with dynamic speech detection threshold |
-
2003
- 2003-10-28 US US10/696,239 patent/US7433462B2/en not_active Expired - Fee Related
- 2003-10-29 EP EP03779418A patent/EP1574032A1/en not_active Withdrawn
- 2003-10-29 WO PCT/US2003/034452 patent/WO2004043052A1/en not_active Application Discontinuation
- 2003-10-29 AU AU2003285102A patent/AU2003285102A1/en not_active Abandoned
- 2003-10-29 JP JP2004550237A patent/JP2006505218A/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3567873A (en) * | 1966-12-24 | 1971-03-02 | Consiglio Nazionale Ricerche | Echo-suppression and noise-elimination system for telephone circuits |
DE1920962B1 (en) * | 1969-04-24 | 1970-11-12 | Siemens Ag | Echo suppressor with two filter sets consisting of bandpasses working in parallel for a speech circuit on a four-wire transmission system |
US4991167A (en) * | 1987-08-22 | 1991-02-05 | Telenorma Telefonbau Und Normalzeit Gmbh | Voice controlled attenuation adjustment in telephone transmission circuits |
FR2678453A1 (en) * | 1991-06-27 | 1992-12-31 | Alcatel Business Systems | Telephone instrument with echo-cancellation device |
US5668794A (en) * | 1995-09-29 | 1997-09-16 | Crystal Semiconductor | Variable gain echo suppressor |
US6226380B1 (en) * | 1998-02-19 | 2001-05-01 | Nortel Networks Limited | Method of distinguishing between echo path change and double talk conditions in an echo canceller |
WO2001050714A1 (en) * | 1999-12-30 | 2001-07-12 | Acoustic Technologies, Inc. | Band-by-band full duplex communication |
EP1229709A2 (en) * | 2001-01-22 | 2002-08-07 | Matsushita Electric Industrial Co., Ltd. | Echo sound signal suppressing apparatus |
Also Published As
Publication number | Publication date |
---|---|
US7433462B2 (en) | 2008-10-07 |
EP1574032A1 (en) | 2005-09-14 |
AU2003285102A1 (en) | 2004-06-07 |
US20040086107A1 (en) | 2004-05-06 |
JP2006505218A (en) | 2006-02-09 |
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