DE68921914D1 - Lautsprecher, der das digital komprimierte Audiosignal benutzt, um die akustische Rückkopplung zu erfassen. - Google Patents
Lautsprecher, der das digital komprimierte Audiosignal benutzt, um die akustische Rückkopplung zu erfassen.Info
- Publication number
- DE68921914D1 DE68921914D1 DE68921914T DE68921914T DE68921914D1 DE 68921914 D1 DE68921914 D1 DE 68921914D1 DE 68921914 T DE68921914 T DE 68921914T DE 68921914 T DE68921914 T DE 68921914T DE 68921914 D1 DE68921914 D1 DE 68921914D1
- Authority
- DE
- Germany
- Prior art keywords
- switch
- voice
- path
- microcomputer
- registers
- 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.)
- Expired - Fee Related
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
- H04M9/085—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 digital techniques
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Transceivers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/182,810 US4843621A (en) | 1987-04-24 | 1988-04-18 | Speakerphone using digitally compressed audio to detect acoustic feedback |
Publications (2)
Publication Number | Publication Date |
---|---|
DE68921914D1 true DE68921914D1 (de) | 1995-05-04 |
DE68921914T2 DE68921914T2 (de) | 1995-11-02 |
Family
ID=22670129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE68921914T Expired - Fee Related DE68921914T2 (de) | 1988-04-18 | 1989-04-17 | Lautsprecher, der das digital komprimierte Audiosignal benutzt, um die akustische Rückkopplung zu erfassen. |
Country Status (7)
Country | Link |
---|---|
US (1) | US4843621A (de) |
EP (1) | EP0340516B1 (de) |
JP (1) | JPH0831905B2 (de) |
AT (1) | ATE120594T1 (de) |
CA (1) | CA1287887C (de) |
DE (1) | DE68921914T2 (de) |
ES (1) | ES2070138T3 (de) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4675863A (en) | 1985-03-20 | 1987-06-23 | International Mobile Machines Corp. | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
US4843621A (en) * | 1987-04-24 | 1989-06-27 | Motorola, Inc. | Speakerphone using digitally compressed audio to detect acoustic feedback |
USRE36934E (en) * | 1988-07-19 | 2000-10-31 | Sgs-Thomson Microelectronics S.A. | Control device for a hands-free telephone set |
FR2641150B1 (de) * | 1988-12-28 | 1991-04-19 | Sgs Thomson Microelectronics | |
JPH02280422A (ja) * | 1989-04-20 | 1990-11-16 | Nec Corp | 音声会議装置用エコーキャンセラのトレーニング方法 |
US5014294A (en) * | 1990-02-01 | 1991-05-07 | Motorola Inc. | Speakerphone for cellular telephones with howl prevention, detection, elimination and determination |
WO1991012682A1 (en) * | 1990-02-08 | 1991-08-22 | Chesilvale Electronics Limited | Programmable telephone |
US5010570A (en) * | 1990-02-20 | 1991-04-23 | Motorola, Inc. | Method for active feedback suppression |
JPH04323938A (ja) * | 1991-04-23 | 1992-11-13 | Toshiba Corp | ハンズフリー回路 |
US5222251A (en) * | 1992-04-27 | 1993-06-22 | Motorola, Inc. | Method for eliminating acoustic echo in a communication device |
US5357567A (en) * | 1992-08-14 | 1994-10-18 | Motorola, Inc. | Method and apparatus for volume switched gain control |
US5442712A (en) * | 1992-11-25 | 1995-08-15 | Matsushita Electric Industrial Co., Ltd. | Sound amplifying apparatus with automatic howl-suppressing function |
US5546383A (en) | 1993-09-30 | 1996-08-13 | Cooley; David M. | Modularly clustered radiotelephone system |
US5467393A (en) * | 1993-11-24 | 1995-11-14 | Ericsson Inc. | Method and apparatus for volume and intelligibility control for a loudspeaker |
US5553137A (en) * | 1994-12-05 | 1996-09-03 | Motorola, Inc. | Method and apparatus for echo canceling in a communication system |
US5636213A (en) * | 1994-12-28 | 1997-06-03 | Motorola | Method, transceiver, and system for providing wireless communication compatible with 10BASE-T Ethernet |
US5588041A (en) * | 1995-01-05 | 1996-12-24 | Motorola, Inc. | Cellular speakerphone and method of operation thereof |
US5835851A (en) * | 1995-01-19 | 1998-11-10 | Ericsson Inc. | Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames |
KR0150098B1 (ko) * | 1995-12-19 | 1998-11-02 | 김주용 | 반향제거 시스템 |
US5966438A (en) * | 1996-03-05 | 1999-10-12 | Ericsson Inc. | Method and apparatus for adaptive volume control for a radiotelephone |
US6978009B1 (en) * | 1996-08-20 | 2005-12-20 | Legerity, Inc. | Microprocessor-controlled full-duplex speakerphone using automatic gain control |
US7149514B1 (en) * | 1997-07-30 | 2006-12-12 | Bellsouth Intellectual Property Corp. | Cellular docking station |
US20080207197A1 (en) | 1997-07-30 | 2008-08-28 | Steven Tischer | Apparatus, method, and computer-readable medium for interfacing devices with communications networks |
US7194083B1 (en) | 2002-07-15 | 2007-03-20 | Bellsouth Intellectual Property Corporation | System and method for interfacing plain old telephone system (POTS) devices with cellular networks |
US6542612B1 (en) * | 1997-10-03 | 2003-04-01 | Alan W. Needham | Companding amplifier with sidechannel gain control |
US6223154B1 (en) * | 1998-07-31 | 2001-04-24 | Motorola, Inc. | Using vocoded parameters in a staggered average to provide speakerphone operation based on enhanced speech activity thresholds |
US6411802B1 (en) | 1999-03-15 | 2002-06-25 | Bellsouth Intellectual Property Management Corporation | Wireless backup telephone device |
US7120454B1 (en) * | 2001-12-26 | 2006-10-10 | Bellsouth Intellectual Property Corp. | Auto sensing home base station for mobile telephone with remote answering capabilites |
US7200424B2 (en) | 2002-07-15 | 2007-04-03 | Bellsouth Intelectual Property Corporation | Systems and methods for restricting the use and movement of telephony devices |
US8275371B2 (en) | 2002-07-15 | 2012-09-25 | At&T Intellectual Property I, L.P. | Apparatus and method for providing communications and connection-oriented services to devices |
US8554187B2 (en) | 2002-07-15 | 2013-10-08 | At&T Intellectual Property I, L.P. | Apparatus and method for routing communications between networks and devices |
US8543098B2 (en) | 2002-07-15 | 2013-09-24 | At&T Intellectual Property I, L.P. | Apparatus and method for securely providing communications between devices and networks |
US8526466B2 (en) | 2002-07-15 | 2013-09-03 | At&T Intellectual Property I, L.P. | Apparatus and method for prioritizing communications between devices |
US8000682B2 (en) | 2002-07-15 | 2011-08-16 | At&T Intellectual Property I, L.P. | Apparatus and method for restricting access to data |
US8416804B2 (en) | 2002-07-15 | 2013-04-09 | At&T Intellectual Property I, L.P. | Apparatus and method for providing a user interface for facilitating communications between devices |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4081622A (en) * | 1976-10-29 | 1978-03-28 | Technex International Ltd. | Electronic circuit for a speakerphone |
US4123711A (en) * | 1977-01-24 | 1978-10-31 | Canadian Patents And Development Limited | Synchronized compressor and expander voice processing system for radio telephone |
US4122304A (en) * | 1977-04-01 | 1978-10-24 | Motorola, Inc. | Control circuitry for a radio telephone |
US4220820A (en) * | 1978-10-02 | 1980-09-02 | Motorola, Inc. | Control circuitry for a radio telephone |
FR2454231A1 (fr) * | 1979-04-13 | 1980-11-07 | Thomson Csf | Emetteur-recepteur a commande automatique d'alternat et reseau de telecommunications comportant un tel emetteur-recepteur |
JPS5797262A (en) * | 1980-12-09 | 1982-06-16 | Nippon Telegr & Teleph Corp <Ntt> | Loud speaker telephone set system |
US4378603A (en) * | 1980-12-23 | 1983-03-29 | Motorola, Inc. | Radiotelephone with hands-free operation |
US4550426A (en) * | 1981-12-31 | 1985-10-29 | Motorola, Inc. | Method and means of detecting the presence of a signal representing voice and of compressing the level of the signal |
US4400584A (en) * | 1982-04-05 | 1983-08-23 | Motorola, Inc. | Speakerphone for radio and, landline telephones |
GB2137458B (en) * | 1983-03-01 | 1986-11-19 | Standard Telephones Cables Ltd | Digital handsfree telephone |
JPS60101769A (ja) * | 1983-11-09 | 1985-06-05 | Hitachi Ltd | 信号伝送装置 |
US4570378A (en) * | 1984-07-10 | 1986-02-18 | Fats And Proteins Research Foundation, Inc. | Method of promoting seedling emergence of field-planted, small-seeded crops |
US4629829A (en) * | 1984-12-14 | 1986-12-16 | Motorola, Inc. | Full duplex speakerphone for radio and landline telephones |
GB2174578B (en) * | 1985-05-04 | 1988-11-09 | Stc Plc | Loud speaking telephone |
CA1233925A (en) * | 1985-05-10 | 1988-03-08 | Gordon J. Reesor | Digital loudspeaking telephone |
JPS61269548A (ja) * | 1985-05-24 | 1986-11-28 | Yokogawa Medical Syst Ltd | 通話制御方法 |
EP0233216A1 (de) * | 1985-08-20 | 1987-08-26 | Motorola, Inc. | Lautsprecher für funk- und landfernsprecher |
US4843621A (en) * | 1987-04-24 | 1989-06-27 | Motorola, Inc. | Speakerphone using digitally compressed audio to detect acoustic feedback |
US4741018A (en) * | 1987-04-24 | 1988-04-26 | Motorola, Inc. | Speakerphone using digitally compressed audio to control voice path gain |
-
1988
- 1988-04-18 US US07/182,810 patent/US4843621A/en not_active Expired - Lifetime
-
1989
- 1989-02-06 CA CA000590170A patent/CA1287887C/en not_active Expired
- 1989-04-17 ES ES89106846T patent/ES2070138T3/es not_active Expired - Lifetime
- 1989-04-17 AT AT89106846T patent/ATE120594T1/de active
- 1989-04-17 DE DE68921914T patent/DE68921914T2/de not_active Expired - Fee Related
- 1989-04-17 EP EP89106846A patent/EP0340516B1/de not_active Expired - Lifetime
- 1989-04-18 JP JP1098630A patent/JPH0831905B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA1287887C (en) | 1991-08-20 |
ES2070138T3 (es) | 1995-06-01 |
ATE120594T1 (de) | 1995-04-15 |
JPH0831905B2 (ja) | 1996-03-27 |
EP0340516B1 (de) | 1995-03-29 |
US4843621A (en) | 1989-06-27 |
DE68921914T2 (de) | 1995-11-02 |
JPH01311794A (ja) | 1989-12-15 |
EP0340516A1 (de) | 1989-11-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |