DE68910346D1 - Frei-Hand-Telefon. - Google Patents
Frei-Hand-Telefon.Info
- Publication number
- DE68910346D1 DE68910346D1 DE89301554T DE68910346T DE68910346D1 DE 68910346 D1 DE68910346 D1 DE 68910346D1 DE 89301554 T DE89301554 T DE 89301554T DE 68910346 T DE68910346 T DE 68910346T DE 68910346 D1 DE68910346 D1 DE 68910346D1
- Authority
- DE
- Germany
- Prior art keywords
- hands
- free phone
- phone
- free
- 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 - Lifetime
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
-
- 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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3390288 | 1988-02-18 | ||
JP63252046A JP2751244B2 (ja) | 1988-02-18 | 1988-10-07 | ハンズフリー回路及びハンズフリー制御方式 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE68910346D1 true DE68910346D1 (de) | 1993-12-09 |
Family
ID=26372678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE89301554T Expired - Lifetime DE68910346D1 (de) | 1988-02-18 | 1989-02-17 | Frei-Hand-Telefon. |
Country Status (6)
Country | Link |
---|---|
US (2) | US4982425A (de) |
EP (1) | EP0330384B1 (de) |
JP (1) | JP2751244B2 (de) |
CA (1) | CA1308441C (de) |
DE (1) | DE68910346D1 (de) |
HK (1) | HK84597A (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5212722A (en) * | 1989-07-24 | 1993-05-18 | Nec Corporation | Hands-free telephone having a handset volume attenuator for controlling speaker volume in a hands-free adaptor |
US5172408A (en) * | 1990-08-01 | 1992-12-15 | At&T Bell Laboratories | Speakerphone state-controlled alerting arrangement |
JP2634946B2 (ja) * | 1990-11-19 | 1997-07-30 | 日本電気株式会社 | ハンズフリー補助回路 |
JPH04323938A (ja) * | 1991-04-23 | 1992-11-13 | Toshiba Corp | ハンズフリー回路 |
JPH04363918A (ja) * | 1991-06-11 | 1992-12-16 | Toshiba Corp | 電話装置 |
US5271057A (en) * | 1991-10-09 | 1993-12-14 | Bell Communications Research, Inc. | Audio processing system for teleconferencing system |
JP2894881B2 (ja) * | 1991-10-28 | 1999-05-24 | 日本電気株式会社 | 無線拡声電話装置 |
EP0619913B1 (de) * | 1991-12-31 | 2002-03-06 | Unisys PulsePoint Communications | Sprachgesteuertes nachrichtensystem und verarbeitungsverfahren |
US5230089A (en) * | 1992-02-03 | 1993-07-20 | Motorola | Automated voice operated transmitter control |
WO1993017750A1 (en) * | 1992-02-28 | 1993-09-16 | Scimed Life Systems, Inc. | Intravascular catheter and method for use thereof |
US5297183A (en) * | 1992-04-13 | 1994-03-22 | Vcs Industries, Inc. | Speech recognition system for electronic switches in a cellular telephone or personal communication network |
US5365583A (en) * | 1992-07-02 | 1994-11-15 | Polycom, Inc. | Method for fail-safe operation in a speaker phone system |
JPH06216986A (ja) * | 1993-01-19 | 1994-08-05 | Mitsubishi Electric Corp | ハンズフリー通話回路 |
JPH06338934A (ja) * | 1993-05-25 | 1994-12-06 | Exar Corp | 事象駆動型制御回路を有するスピーカーホーン |
US5434912A (en) * | 1993-08-11 | 1995-07-18 | Bell Communications Research, Inc. | Audio processing system for point-to-point and multipoint teleconferencing |
GB2281680B (en) * | 1993-08-27 | 1998-08-26 | Motorola Inc | A voice activity detector for an echo suppressor and an echo suppressor |
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 |
US5963877A (en) * | 1997-01-30 | 1999-10-05 | Sony Corporation | Telephone call receiver indicator |
JP3220979B2 (ja) * | 1998-01-09 | 2001-10-22 | 日本電気株式会社 | 音声スイッチ |
DE10120525A1 (de) | 2001-04-26 | 2002-11-07 | Harman Audio Electronic Sys | Schaltungsanordnung zur Audiowiedergabe und zum Freisprechen in einem Kraftfahrzeug |
US20060136201A1 (en) * | 2004-12-22 | 2006-06-22 | Motorola, Inc. | Hands-free push-to-talk radio |
US7792136B2 (en) * | 2007-01-31 | 2010-09-07 | Harris Corporation | Carrier sense multiple access (CSMA) for non-packetized wireless digital voice networks using intelligent conversation boundary detection |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1029163A (en) * | 1964-05-29 | 1966-05-11 | Standard Telephones Cables Ltd | Improvements in or relating to telephone sets |
US3894187A (en) * | 1973-10-31 | 1975-07-08 | Tokyo Shibaura Electric Co | Circuit for comparing at least two input signals to generate control signals |
US3970786A (en) * | 1974-06-27 | 1976-07-20 | Stromberg-Carlson Corporation | Loudspeaking telephone with improved receive sensitivity |
JPS5229566A (en) * | 1975-08-31 | 1977-03-05 | Showa Electric Wire & Cable Co Ltd | Manufacturing process of elastic clasp |
US4308427A (en) * | 1979-09-06 | 1981-12-29 | Southwest Utilities, Inc. | Hands-free talk-back intercommunication system |
JPS5787656A (en) * | 1980-11-21 | 1982-06-01 | Nippon Telegr & Teleph Corp <Ntt> | Loudspeaker transmitting system |
JPS5797262A (en) * | 1980-12-09 | 1982-06-16 | Nippon Telegr & Teleph Corp <Ntt> | Loud speaker telephone set system |
JPS5880937A (ja) * | 1981-11-06 | 1983-05-16 | Matsushita Electric Ind Co Ltd | 音声スイツチ通話装置 |
US4400584A (en) * | 1982-04-05 | 1983-08-23 | Motorola, Inc. | Speakerphone for radio and, landline telephones |
GB2122851B (en) * | 1982-06-10 | 1986-03-19 | Standard Telephones Cables Ltd | Loudspeaking telephones |
JPS596655A (ja) * | 1982-07-02 | 1984-01-13 | Toa Tokushu Denki Kk | 電話機 |
JPS5962259A (ja) * | 1982-10-01 | 1984-04-09 | Matsushita Electric Ind Co Ltd | 音声スイツチ装置 |
FR2571191B1 (fr) * | 1984-10-02 | 1986-12-26 | Renault | Systeme de radiotelephone, notamment pour vehicule automobile |
JPH063950B2 (ja) * | 1985-02-28 | 1994-01-12 | 株式会社東芝 | 拡声電話装置 |
JPS61205029A (ja) * | 1985-03-08 | 1986-09-11 | Nec Corp | 無線電話装置 |
US4737976A (en) * | 1985-09-03 | 1988-04-12 | Motorola, Inc. | Hands-free control system for a radiotelephone |
US4724540A (en) * | 1986-09-02 | 1988-02-09 | Motorola, Inc. | Speakerphone with fast idle mode |
GB2197166A (en) * | 1986-11-07 | 1988-05-11 | Storno As | Controlling gain in speech-controlled telephones |
-
1988
- 1988-10-07 JP JP63252046A patent/JP2751244B2/ja not_active Expired - Fee Related
-
1989
- 1989-02-17 DE DE89301554T patent/DE68910346D1/de not_active Expired - Lifetime
- 1989-02-17 CA CA000591453A patent/CA1308441C/en not_active Expired - Fee Related
- 1989-02-17 EP EP89301554A patent/EP0330384B1/de not_active Expired - Lifetime
- 1989-02-21 US US07/313,209 patent/US4982425A/en not_active Expired - Lifetime
- 1989-10-05 US US07/417,617 patent/US5054061A/en not_active Expired - Lifetime
-
1997
- 1997-06-19 HK HK84597A patent/HK84597A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0330384B1 (de) | 1993-11-03 |
EP0330384A3 (en) | 1990-06-13 |
EP0330384A2 (de) | 1989-08-30 |
CA1308441C (en) | 1992-10-06 |
US4982425A (en) | 1991-01-01 |
US5054061A (en) | 1991-10-01 |
HK84597A (en) | 1997-06-27 |
JP2751244B2 (ja) | 1998-05-18 |
JPH01295554A (ja) | 1989-11-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8332 | No legal effect for de |