| Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105) |
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| 07/11/2000 | US6088362 Key telephone system without common control |
| 07/11/2000 | CA2232346C Coordinating telephones or adjuncts on the same loop |
| 07/06/2000 | WO2000039991A1 Methods and apparatus for adaptive signal gain control in communications systems |
| 07/06/2000 | CA2356620A1 Methods and apparatus for adaptive signal gain control in communications systems |
| 07/05/2000 | EP1017032A2 Patient/nurse communication method |
| 07/05/2000 | CN1054246C Bus-type telephone system |
| 06/29/2000 | DE19858571A1 Circuit for connecting telecommunications system with analogue connection device(s) to door intercom, has programmable control unit which causes transmitter to transmit converted call number as dialling signal to telecommunications system |
| 06/27/2000 | US6081732 Acoustic echo elimination in a digital mobile communications system |
| 06/21/2000 | EP0784910B1 Switching network for a mobile telecommunications system |
| 06/21/2000 | CN2384381Y Lightning prevention connection box for telephone |
| 06/21/2000 | CN1257624A Method and apparatus for controlling echo on both sides of a connection |
| 06/20/2000 | CA2004005C Echo canceller |
| 06/14/2000 | CN1053544C Coincidence quasi duplex centre-less frequency division multiple address and noise-resistance carrier communication system |
| 06/08/2000 | WO2000033553A2 Control interface protocol for telephone sets for a satellite telephone system |
| 06/07/2000 | CN1255821A Echo eliminating device and method thereof |
| 06/07/2000 | CN1255800A High impedance absolute telephone line voltage measuring circuit |
| 06/06/2000 | US6072826 Key telephone system without common control |
| 05/31/2000 | CN1255255A Echo reducing phone with state machine controlled switches |
| 05/30/2000 | US6069878 TDM digital matrix intercom system |
| 05/30/2000 | CA2132428C Speech communication apparatus |
| 05/23/2000 | CA2052351C Telephone handsfree algorithm |
| 05/17/2000 | EP1000501A1 Hand free system |
| 05/17/2000 | EP1000496A2 A telephone line interface circuit with ac and dc line adjustment |
| 05/17/2000 | CN1253677A Multi-input wireless phone with echo suppression |
| 05/16/2000 | US6064873 Method and apparatus for controlling echo on both sides of a connection |
| 05/10/2000 | EP0999689A1 Echo cancelling device and method |
| 05/10/2000 | EP0999454A1 High impedance absolute telephone line voltage measurement circuit |
| 05/04/2000 | WO2000025441A1 Methods and apparatus for providing echo suppression using frequency domain nonlinear processing |
| 05/04/2000 | DE19850272A1 Verfahren zur Verbesserung der Echounterdrückung in einem Telekommunikaionssystem A method for improving the echo suppression in a Telekommunikaionssystem |
| 05/03/2000 | EP0998110A2 Method for improving the echo cancellation in a telecommunication system |
| 05/03/2000 | CN1251959A Method and device for determining adjacent speech |
| 04/30/2000 | CA2286963A1 A process for improving the echo suppression in a telecommunications system |
| 04/26/2000 | EP0995188A1 Methods and apparatus for measuring signal level and delay at multiple sensors |
| 04/25/2000 | CA2193152C Telephone handset interface with feedback control |
| 04/18/2000 | US6052573 Fixed subscriber unit of wireless local loop system |
| 04/18/2000 | CA2186416C Method and apparatus for multi-channel acoustic echo cancellation |
| 04/18/2000 | CA2089101C Method for multiple access in a digital communication system |
| 04/13/2000 | DE19947682A1 Method and zero delay structure for compensating for echoes and sub-band echoes avoids delays usually occurring in sub-band sectioning and/or sub-band reconstruction |
| 04/12/2000 | EP0992151A1 Method and device for suppressing echo in a hands free device such as a telephone |
| 04/11/2000 | US6049606 Circuit and method of double talk detection for use in handsfree telephony terminals |
| 04/07/2000 | CA2285137A1 Zero-delay structure for sub-band echo cancellation |
| 04/06/2000 | DE19843896A1 Telekommunikationssystem mit einem als Türsprecheinrichtung ausgebildeten Endgerät Telecommunication system with a trained as a door opening device terminal |
| 04/05/2000 | CN1249889A Device and method for processing speech |
| 04/04/2000 | US6046995 Key telephone system without common control |
| 03/30/2000 | WO2000018098A1 Method and system for distribution of wireless signals for increased wireless coverage using the power lines |
| 03/29/2000 | EP0989724A2 Communication system with a terminal designed as a door telephone |
| 03/29/2000 | EP0988744A2 Acoustic echo canceler |
| 03/28/2000 | US6044150 Method and apparatus for a host-based personal computer speakerphone |
| 03/23/2000 | WO2000016497A1 Echo canceler adaptive filter optimization |
| 03/21/2000 | US6041290 Method of adaptively adjusting the coefficients of a digital filter in an echo canceller |
| 03/16/2000 | WO2000014731A1 Apparatus and method for transmitting an improved voice signal over a communications device located in a vehicle with adaptive vibration noise cancellation |
| 03/15/2000 | CN1247663A AC-center clipper for noise and echo suppression in communications system |
| 03/15/2000 | CN1247652A Double talk and echo path change detection in telephony system |
| 03/14/2000 | US6038456 Mobile telecommunication system |
| 03/08/2000 | EP0984609A2 Method and apparatus of canceling multi-channel echoes |
| 03/08/2000 | EP0983678A1 Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions |
| 03/08/2000 | EP0983677A1 Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling |
| 03/08/2000 | EP0800742A4 Smart phone integration with computer systems |
| 03/08/2000 | EP0693238A4 A home and small business phone system for operation on a single internal twisted pair line |
| 03/07/2000 | US6035034 Double talk and echo path change detection in a telephony system |
| 03/07/2000 | CA2193154C Circuit and method for reducing common mode interference in telephone instruments |
| 03/02/2000 | WO2000011857A1 Method and apparatus for spectral containment over telephone service lines |
| 03/02/2000 | WO1999035608A9 Method and apparatus for image capture, compression and transmission of a visual image |
| 03/02/2000 | DE19840678A1 House communications installation for offices and block of flats with several residents, has talking and listening units |
| 03/02/2000 | DE19839681A1 Door call and release installation for communications between visitors and occupants or residents prior to access permission |
| 02/29/2000 | US6031908 Echo canceller employing dual-H architecture having variable adaptive gain settings |
| 02/22/2000 | US6029072 Portable telephone with terminal mode facility |
| 02/22/2000 | US6028929 Echo canceller employing dual-H architecture having improved non-linear echo path detection |
| 02/17/2000 | WO2000008837A1 Methods and apparatus for mitigating the effects of microphone overload in echo cancelation systems |
| 02/17/2000 | WO2000008836A1 Device for digital processing with frequency filtering and reduced computation complexity |
| 02/17/2000 | WO1999057868A3 A telephone line interface circuit with ac and dc line adjustment |
| 02/17/2000 | DE19935587A1 Detection of echo state in duplex transmission e.g. when using mobile phone system, is achieved by monitoring adaptive filter coefficient update, which reveals phantom signal presence on exceeding threshold |
| 02/15/2000 | CA2171492C Acoustic echo canceler |
| 02/03/2000 | WO2000005862A1 Outgoing telephone line preselection based on dialed number |
| 02/01/2000 | US6021181 Electronic voice mail message handling system |
| 02/01/2000 | CA2177266C Voice enhancement system and method |
| 01/27/2000 | WO2000004698A1 Digital adaptive filter and acoustic echo canceller using the same |
| 01/27/2000 | DE19831320A1 Digital adaptive filter for communications system, e.g. hands free communications in vehicles, has power estimation unit recursively smoothing increasing and decreasing input power asymmetrically |
| 01/26/2000 | EP0974205A1 Echo reducing phone with state machine controlled switches |
| 01/25/2000 | US6018219 Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same |
| 01/19/2000 | EP0972355A2 Method and apparatus for controlling echo on both sides of a connection |
| 01/12/2000 | EP0971524A2 Door telephone installation with a door station and a plurality of dwelling stations |
| 01/05/2000 | EP0969692A1 Device and method for processing speech |
| 01/05/2000 | EP0968572A1 Multi-input wireless phone with echo suppression |
| 12/29/1999 | WO1999067940A1 Acoustic echo canceller |
| 12/29/1999 | EP0967827A2 Method for performing call forwarding service with an ISDN network terminator |
| 12/29/1999 | EP0864214A4 Ring communication system using isdn |
| 12/28/1999 | US6009165 Full duplex speakerphone system |
| 12/22/1999 | EP0965219A2 A system and method for providing high terminal coupling loss in a handsfree terminal |
| 12/22/1999 | EP0965214A1 Method and apparatus for telephone intercom doorbell response system |
| 12/22/1999 | EP0965176A2 Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input |
| 12/22/1999 | CN1239369A Device and method for radio terminal with handsfree function |
| 12/21/1999 | US6005934 Simulating changes in telephone subscriber line |
| 12/14/1999 | US6002950 Satellite communication apparatus |
| 12/14/1999 | US6002776 Directional acoustic signal processor and method therefor |
| 12/08/1999 | EP0962091A2 An electronic voice mail message handling system |
| 12/07/1999 | US5999828 Multi-user wireless telephone having dual echo cancellers |
| 12/07/1999 | US5999605 Multiple subscriber implementing method in key phone system |
| 12/01/1999 | EP0713625A4 An audio processing system for teleconferencing |
| 11/30/1999 | US5995604 Method of preventing fraudulent toll calls by key system users |