WO1993006679A1 - Handsfree telephone apparatus - Google Patents
Handsfree telephone apparatus Download PDFInfo
- Publication number
- WO1993006679A1 WO1993006679A1 PCT/CA1992/000412 CA9200412W WO9306679A1 WO 1993006679 A1 WO1993006679 A1 WO 1993006679A1 CA 9200412 W CA9200412 W CA 9200412W WO 9306679 A1 WO9306679 A1 WO 9306679A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- attenuator
- filter
- paths
- speech
- path
- Prior art date
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
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92920102A EP0605549B1 (en) | 1991-09-27 | 1992-09-25 | Handsfree telephone apparatus |
DE69223416T DE69223416T2 (en) | 1991-09-27 | 1992-09-25 | HANDS-FREE TELEPHONE |
JP05505656A JP3104072B2 (en) | 1991-09-27 | 1992-09-25 | Hands-free telephone |
US08/211,181 US5471528A (en) | 1991-09-27 | 1992-09-25 | Voice switched speakerphone with filters having exponential transfer function in the monitoring path |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002052351A CA2052351C (en) | 1991-09-27 | 1991-09-27 | Telephone handsfree algorithm |
CA2,052,351 | 1991-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993006679A1 true WO1993006679A1 (en) | 1993-04-01 |
Family
ID=4148452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1992/000412 WO1993006679A1 (en) | 1991-09-27 | 1992-09-25 | Handsfree telephone apparatus |
Country Status (6)
Country | Link |
---|---|
US (1) | US5471528A (en) |
EP (1) | EP0605549B1 (en) |
JP (1) | JP3104072B2 (en) |
CA (1) | CA2052351C (en) |
DE (1) | DE69223416T2 (en) |
WO (1) | WO1993006679A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0627839A1 (en) * | 1993-05-25 | 1994-12-07 | Exar Corporation | Speakerphone with event driven control circuit |
WO1995006382A2 (en) * | 1993-08-27 | 1995-03-02 | Motorola, Inc. | A voice activity detector for an echo suppressor and an echo suppressor |
EP0674415A1 (en) * | 1994-03-25 | 1995-09-27 | Nec Corporation | Telephone having a speech band limiting function |
FR2719173A1 (en) * | 1994-04-26 | 1995-10-27 | Mitsubishi Electric Corp | Communication apparatus with noise adjustment. |
US5615256A (en) * | 1994-05-13 | 1997-03-25 | Nec Corporation | Device and method for automatically controlling sound volume in a communication apparatus |
CN1057186C (en) * | 1994-09-22 | 2000-10-04 | 日本电气株式会社 | Transmission control method of downgoing control signal in TDMA mobile communication system |
AU755658B2 (en) * | 1998-01-09 | 2002-12-19 | Lenovo Innovations Limited (Hong Kong) | Voice switching system capable of improving a quality of conversation |
US6768776B1 (en) * | 1994-02-04 | 2004-07-27 | Legerity, Inc. | Transcoder-codec circuit arrangement and method that supports voice-switched hands-free radio operation |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06216986A (en) * | 1993-01-19 | 1994-08-05 | Mitsubishi Electric Corp | Hand-free speech circuit |
FI108830B (en) * | 1993-12-23 | 2002-03-28 | Nokia Corp | Method and apparatus for echo suppression in a telephone apparatus |
US5668871A (en) * | 1994-04-29 | 1997-09-16 | Motorola, Inc. | Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit |
JPH0832494A (en) * | 1994-07-13 | 1996-02-02 | Mitsubishi Electric Corp | Hand-free talking device |
US6041118A (en) * | 1994-12-22 | 2000-03-21 | Lucent Technologies Inc. | Architecture for telephone set |
JPH08204619A (en) * | 1995-01-26 | 1996-08-09 | Nec Corp | Echo suppressor |
US5680450A (en) * | 1995-02-24 | 1997-10-21 | Ericsson Inc. | Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones |
US5636272A (en) * | 1995-05-30 | 1997-06-03 | Ericsson Inc. | Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones |
CN1141552A (en) * | 1995-05-31 | 1997-01-29 | 尾电话伴侣公司 | Software speakerphone system and method of operating speakerphone |
US5692042A (en) * | 1995-05-31 | 1997-11-25 | Casio Phonemate, Inc. | Speakerphone controlled by a comparator with hysteresis |
US6175634B1 (en) | 1995-08-28 | 2001-01-16 | Intel Corporation | Adaptive noise reduction technique for multi-point communication system |
US5598466A (en) * | 1995-08-28 | 1997-01-28 | Intel Corporation | Voice activity detector for half-duplex audio communication system |
US5764753A (en) * | 1995-09-29 | 1998-06-09 | Crystal Semiconductor Corp. | Half-duplex controller |
US5867573A (en) * | 1996-02-06 | 1999-02-02 | Lucent Technologies Inc. | Telephone handset interface with feedback control |
US5892823A (en) | 1996-03-27 | 1999-04-06 | Hello Direct, Inc. | Smart interface technology |
US5838787A (en) * | 1996-06-27 | 1998-11-17 | Northern Telecom Limited | Method and system for controlling echo return loss using a complementary variolosses in transmit path |
US5796818A (en) * | 1996-08-08 | 1998-08-18 | Northern Telecom Limited | Dynamic optimization of handsfree microphone gain |
US6978009B1 (en) | 1996-08-20 | 2005-12-20 | Legerity, Inc. | Microprocessor-controlled full-duplex speakerphone using automatic gain control |
US5787165A (en) * | 1996-12-13 | 1998-07-28 | Ericsson Inc. | Handsfree radiotelephone having dynamic path attenuation control for echo suppression |
AUPP999199A0 (en) * | 1999-04-28 | 1999-05-20 | Telstra Corporation Limited | Apparatus and method for detecting far end speech |
SE514793C2 (en) * | 1999-05-31 | 2001-04-23 | Ericsson Telefon Ab L M | Procedure and system for line level adjustment between networks |
US7263074B2 (en) * | 1999-12-09 | 2007-08-28 | Broadcom Corporation | Voice activity detection based on far-end and near-end statistics |
JP3929686B2 (en) * | 2000-08-14 | 2007-06-13 | 松下電器産業株式会社 | Voice switching apparatus and method |
US6795547B1 (en) * | 2000-08-02 | 2004-09-21 | Conexant Systems, Inc. | Full duplex speaker-phone providing increased loop stability |
US6836156B2 (en) * | 2003-04-25 | 2004-12-28 | Broadcom Corp. | High frequency signal peak detector |
US8611554B2 (en) * | 2008-04-22 | 2013-12-17 | Bose Corporation | Hearing assistance apparatus |
US8340312B2 (en) | 2009-08-04 | 2012-12-25 | Apple Inc. | Differential mode noise cancellation with active real-time control for microphone-speaker combinations used in two way audio communications |
GB2561021B (en) * | 2017-03-30 | 2019-09-18 | Cirrus Logic Int Semiconductor Ltd | Apparatus and methods for monitoring a microphone |
US11769510B2 (en) | 2017-09-29 | 2023-09-26 | Cirrus Logic Inc. | Microphone authentication |
GB2567018B (en) | 2017-09-29 | 2020-04-01 | Cirrus Logic Int Semiconductor Ltd | Microphone authentication |
KR102425566B1 (en) | 2020-08-10 | 2022-07-26 | 김태준 | Lure For Fish |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4490582A (en) * | 1983-02-18 | 1984-12-25 | At&T Information Systems Inc. | Speakerphone control circuit |
US4513177A (en) * | 1980-12-09 | 1985-04-23 | Nippon Telegraph & Telephone Public Corporation | Loudspeaking telephone system |
US4555596A (en) * | 1982-06-10 | 1985-11-26 | International Standard Electric Corporation | Loudspeaking telephones |
GB2161047A (en) * | 1984-06-28 | 1986-01-02 | Stc Plc | Improvements in telephone instruments |
US4571461A (en) * | 1983-04-18 | 1986-02-18 | Nec Corporation | Conference telephone apparatus |
US4608462A (en) * | 1984-06-29 | 1986-08-26 | International Standard Electric Corporation | Telephone instrument circuit |
US5099472A (en) * | 1989-10-24 | 1992-03-24 | Northern Telecom Limited | Hands free telecommunication apparatus and method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3963868A (en) * | 1974-06-27 | 1976-06-15 | Stromberg-Carlson Corporation | Loudspeaking telephone hysteresis and ambient noise control |
US4210872A (en) * | 1978-09-08 | 1980-07-01 | American Microsystems, Inc. | High pass switched capacitor filter section |
US4293820A (en) * | 1979-08-23 | 1981-10-06 | Centre De Recherche Industrielle Du Quebec | Positive feedback biquad filter |
US4315227A (en) * | 1979-12-05 | 1982-02-09 | Bell Telephone Laboratories, Incorporated | Generalized switched-capacitor active filter |
CA1233925A (en) * | 1985-05-10 | 1988-03-08 | Gordon J. Reesor | Digital loudspeaking telephone |
US4715063A (en) * | 1985-08-20 | 1987-12-22 | Motorola, Inc. | Speakerphone for radio and landline telephones |
EP0290952B1 (en) * | 1987-05-15 | 1992-11-04 | Alcatel SEL Aktiengesellschaft | Speech control circuitry for a telecommunication terminal |
US4879745A (en) * | 1988-10-12 | 1989-11-07 | Ibm Corporation | Half-duplex speakerphone |
FR2641150B1 (en) * | 1988-12-28 | 1991-04-19 | Sgs Thomson Microelectronics | |
DE59008583D1 (en) * | 1989-10-18 | 1995-04-06 | Siemens Ag | Method for automatic switching of messages and circuit arrangement for carrying out the method. |
US5058153A (en) * | 1989-12-27 | 1991-10-15 | Carew Edward C | Noise mitigation and mode switching in communications terminals such as telephones |
US5075687A (en) * | 1990-09-27 | 1991-12-24 | Advanced Micro Devices, Inc. | Echo suppression with both digital and analog variable attenuators |
-
1991
- 1991-09-27 CA CA002052351A patent/CA2052351C/en not_active Expired - Lifetime
-
1992
- 1992-09-25 DE DE69223416T patent/DE69223416T2/en not_active Expired - Lifetime
- 1992-09-25 JP JP05505656A patent/JP3104072B2/en not_active Expired - Fee Related
- 1992-09-25 US US08/211,181 patent/US5471528A/en not_active Expired - Lifetime
- 1992-09-25 EP EP92920102A patent/EP0605549B1/en not_active Expired - Lifetime
- 1992-09-25 WO PCT/CA1992/000412 patent/WO1993006679A1/en active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4513177A (en) * | 1980-12-09 | 1985-04-23 | Nippon Telegraph & Telephone Public Corporation | Loudspeaking telephone system |
US4555596A (en) * | 1982-06-10 | 1985-11-26 | International Standard Electric Corporation | Loudspeaking telephones |
US4490582A (en) * | 1983-02-18 | 1984-12-25 | At&T Information Systems Inc. | Speakerphone control circuit |
US4571461A (en) * | 1983-04-18 | 1986-02-18 | Nec Corporation | Conference telephone apparatus |
GB2161047A (en) * | 1984-06-28 | 1986-01-02 | Stc Plc | Improvements in telephone instruments |
US4608462A (en) * | 1984-06-29 | 1986-08-26 | International Standard Electric Corporation | Telephone instrument circuit |
US5099472A (en) * | 1989-10-24 | 1992-03-24 | Northern Telecom Limited | Hands free telecommunication apparatus and method |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0627839A1 (en) * | 1993-05-25 | 1994-12-07 | Exar Corporation | Speakerphone with event driven control circuit |
US5544242A (en) * | 1993-05-25 | 1996-08-06 | Exar Corporation | Speakerphone with event driven control circuit |
WO1995006382A2 (en) * | 1993-08-27 | 1995-03-02 | Motorola, Inc. | A voice activity detector for an echo suppressor and an echo suppressor |
WO1995006382A3 (en) * | 1993-08-27 | 1995-04-13 | Motorola Inc | A voice activity detector for an echo suppressor and an echo suppressor |
US5619566A (en) * | 1993-08-27 | 1997-04-08 | Motorola, Inc. | Voice activity detector for an echo suppressor and an echo suppressor |
US6768776B1 (en) * | 1994-02-04 | 2004-07-27 | Legerity, Inc. | Transcoder-codec circuit arrangement and method that supports voice-switched hands-free radio operation |
US5793863A (en) * | 1994-03-25 | 1998-08-11 | Nec Corporation | Telephone having a speech band limiting function |
EP0674415A1 (en) * | 1994-03-25 | 1995-09-27 | Nec Corporation | Telephone having a speech band limiting function |
CN1085481C (en) * | 1994-03-25 | 2002-05-22 | 日本电气株式会社 | Telephone having a speech band limiting function |
US6185298B1 (en) | 1994-03-25 | 2001-02-06 | Nec Corporation | Telephone having a speech ban limiting function |
FR2719173A1 (en) * | 1994-04-26 | 1995-10-27 | Mitsubishi Electric Corp | Communication apparatus with noise adjustment. |
GB2288959B (en) * | 1994-04-26 | 1999-03-31 | Mitsubishi Electric Corp | A noise-controlled communication apparatus |
US5734987A (en) * | 1994-04-26 | 1998-03-31 | Mitsubishi Denki Kabushiki Kaisha | Noise-controlled communication apparatus |
GB2288959A (en) * | 1994-04-26 | 1995-11-01 | Mitsubishi Electric Corp | A noise-controlled communication apparatus |
US5615256A (en) * | 1994-05-13 | 1997-03-25 | Nec Corporation | Device and method for automatically controlling sound volume in a communication apparatus |
CN1057186C (en) * | 1994-09-22 | 2000-10-04 | 日本电气株式会社 | Transmission control method of downgoing control signal in TDMA mobile communication system |
AU755658B2 (en) * | 1998-01-09 | 2002-12-19 | Lenovo Innovations Limited (Hong Kong) | Voice switching system capable of improving a quality of conversation |
Also Published As
Publication number | Publication date |
---|---|
DE69223416T2 (en) | 1998-07-09 |
DE69223416D1 (en) | 1998-01-15 |
CA2052351A1 (en) | 1993-03-28 |
EP0605549A1 (en) | 1994-07-13 |
CA2052351C (en) | 2000-05-23 |
JPH06510889A (en) | 1994-12-01 |
EP0605549B1 (en) | 1997-12-03 |
JP3104072B2 (en) | 2000-10-30 |
US5471528A (en) | 1995-11-28 |
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