| Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105) |
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| 09/02/1997 | US5663951 Delayed transmission of data packets over networks |
| 08/28/1997 | WO1997031439A1 Systems for feedback cancellation in an audio interface garment |
| 08/27/1997 | CN1158070A Apparatus for embodying combined time switching and conference calling functions |
| 08/26/1997 | US5661813 Method and apparatus for multi-channel acoustic echo cancellation |
| 08/26/1997 | US5661795 Adaptive signal processing device, echo suppressing device and hand-portable telephone device |
| 08/21/1997 | WO1997030558A1 Digital button telephone system and extension terminal for the same |
| 08/21/1997 | WO1997030555A2 Multiple application switching platform and method |
| 08/21/1997 | DE19642461A1 Automatic answering machine for integration with door bell |
| 08/20/1997 | CN1157680A Bell system and/or multiple door intercom system |
| 08/20/1997 | CN1157522A Echo Removing apparatus |
| 08/19/1997 | US5659603 Method for printing key telephone designation strips |
| 08/13/1997 | EP0789476A2 Noise reduction arrangement |
| 08/13/1997 | EP0789475A2 Circuit and method for reducing common mode interference in telephone instruments |
| 08/13/1997 | EP0789472A2 Telephone handset interface with feedback control |
| 08/13/1997 | EP0788705A1 Method of synchronizing leds between a digital telephone and remote options |
| 08/12/1997 | US5657384 Full duplex speakerphone |
| 08/07/1997 | WO1997028614A1 A system and method for performing echo cancellation in a communications network employing a mixed mode lms adaptive balance filter |
| 08/06/1997 | EP0615674A4 Network echo canceller. |
| 08/05/1997 | US5655012 Private branch exchange apparatus |
| 07/31/1997 | WO1997027697A1 Portable telephone with terminal mode facility |
| 07/31/1997 | WO1997027550A2 Communication system with multicarrier telephony transport |
| 07/31/1997 | DE19603095A1 Office telephone for connection to door control system |
| 07/29/1997 | USRE35574 Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation |
| 07/29/1997 | US5652790 Hierarchical switch support of services for subscribers based on organizational membership |
| 07/29/1997 | US5652788 Key telephone apparatus |
| 07/23/1997 | EP0785662A2 Private digital communication apparatus for interconnecting a plurality of elements |
| 07/23/1997 | EP0785659A2 Microphone signal expansion for background noise reduction |
| 07/23/1997 | EP0784910A1 Mobile telecommunications system |
| 07/22/1997 | US5651061 Telephone exchange system |
| 07/18/1997 | CA2195339A1 Private digital communication apparatus for interconnecting a plurality of elements |
| 07/15/1997 | US5649008 Circuit and method of reducing sidetone in a receive signal path |
| 07/15/1997 | US5649005 PC with telephony exchange function |
| 07/10/1997 | WO1997024853A2 Echo reduction for telephone communication system |
| 07/10/1997 | WO1997024804A1 Gauging convergence of adaptive filters |
| 07/08/1997 | US5646991 Noise replacement system and method in an echo canceller |
| 07/08/1997 | US5646990 Efficient speakerphone anti-howling system |
| 07/01/1997 | US5644635 Method of and device for echo cancellation |
| 07/01/1997 | US5644630 Intercom system for a service establishment |
| 06/25/1997 | EP0781029A2 Loudspeaker telephone device comprising a novel noise suppressing circuit |
| 06/18/1997 | EP0779732A2 Multi-point voice conferencing system over a wide area network |
| 06/17/1997 | US5640450 Speech circuit controlling sidetone signal by background noise level |
| 06/17/1997 | US5640448 Key telephone system capable of simulation by button operations |
| 06/12/1997 | WO1997021280A1 A method and arrangement for elimination of acoustic echoes in a telecommunication system |
| 06/10/1997 | US5638439 Adaptive filter and echo canceller |
| 06/10/1997 | US5638366 Data transport for internal messaging |
| 06/10/1997 | US5638311 Filter coefficient estimation apparatus |
| 06/05/1997 | WO1997014242A3 Method for optimizing the use of urban telephone lines |
| 06/03/1997 | US5636323 Speech communication apparatus having an echo canceler |
| 06/03/1997 | US5636272 Apparatus amd method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones |
| 06/03/1997 | CA2119778C Audio processing system for teleconferencing system |
| 05/29/1997 | WO1997019533A1 Subscriber line multiplexer |
| 05/28/1997 | EP0776118A2 Echo canceller |
| 05/28/1997 | DE19620031C1 Automatic transmit-receive switching at hands-free telephone terminal |
| 05/27/1997 | US5633936 Method and apparatus for detecting a near-end speech signal |
| 05/24/1997 | CA2191118A1 Echo canceller |
| 05/21/1997 | EP0774875A2 Hierarchical switch support of services for subscribers based on organizational membership |
| 05/20/1997 | US5631967 Processing audio signals using a state variable |
| 05/20/1997 | US5631899 Acoustic echo canceler |
| 05/14/1997 | EP0772951A1 Multi-nodal digital telephone distribution system |
| 05/13/1997 | CA2103302C Key telephone system |
| 05/07/1997 | EP0771502A1 Bell system and/or multiple door intercom system |
| 05/07/1997 | DE19541018A1 Intercom system with telephone sets for two users |
| 05/07/1997 | CN1149373A Voice enhancement system and method |
| 04/29/1997 | US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system |
| 04/24/1997 | WO1997015137A1 A telecommunications switch |
| 04/24/1997 | DE19538880A1 Channel correction for microphone array |
| 04/23/1997 | EP0769867A2 Subband acoustic echo canceller |
| 04/22/1997 | US5623537 Telephone message center |
| 04/17/1997 | WO1997014242A2 Method for optimizing the use of urban telephone lines |
| 04/17/1997 | DE19537772A1 Hands-free communication system for telephone terminal |
| 04/17/1997 | CA2207055A1 Method for optimizing the use of urban telephone lines |
| 04/16/1997 | EP0768789A2 Method and circuit arrangement for speech detection of a remote subscriber in a telephone terminal |
| 04/15/1997 | US5621800 Integrated circuit that performs multiple communication tasks |
| 04/15/1997 | US5621724 Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time |
| 04/15/1997 | CA2055828C Arbitrary selecting of a terminal to be called in key telephone systems |
| 04/14/1997 | CA2187812A1 Method and circuit arrangement for detecting speech in a telephone terminal from a remote speaker |
| 04/09/1997 | EP0767569A1 Method and device for adaptive identification and related adaptive echo canceller |
| 04/09/1997 | CN1147173A Key extension setting method using dual color light emitting diode in key-phone system |
| 04/08/1997 | US5619566 Voice activity detector for an echo suppressor and an echo suppressor |
| 04/08/1997 | CA2110031C Digital sound level control apparatus |
| 04/02/1997 | EP0766446A2 Method and apparatus for multi-channel acoustic echo cancellation |
| 04/01/1997 | US5617472 Noise suppression of acoustic signal in telephone set |
| 03/27/1997 | WO1997011551A1 Method of and apparatus for off-hook signalling between telephones or adjuncts on the same loop |
| 03/27/1997 | WO1997011550A1 Coordinating telephones or adjuncts on the same loop |
| 03/27/1997 | WO1997011533A1 A directional acoustic signal processor and method therefor |
| 03/26/1997 | EP0765067A2 Loop gain processing system for speakerphone applications |
| 03/26/1997 | EP0765066A2 Efficient speakerphone anti-howling system |
| 03/25/1997 | US5615256 Device and method for automatically controlling sound volume in a communication apparatus |
| 03/25/1997 | US5615246 Method and apparatus for spurious signal detection and disconnection in a hybrid fiber/coax network architecture |
| 03/19/1997 | CN1145710A Frequency-domain adaptive-filter acoustic echo canceller |
| 03/18/1997 | US5612996 Loop gain processing system for speakerphone applications |
| 03/12/1997 | CN2249470Y Domestic telephone switching device |
| 03/11/1997 | US5610909 Multistage echo canceler including time variation compensation |
| 03/06/1997 | WO1997008882A1 Voice activity detector for half-duplex audio communication system |
| 03/05/1997 | EP0760575A2 Echo canceller with adaptive and non-adaptive filters |
| 03/05/1997 | EP0760574A2 Echo canceller system with shared coefficient memory |
| 03/04/1997 | US5608804 Method of and apparatus for identifying a system with adaptive filter |
| 03/04/1997 | US5608793 Speech control apparatus used in a folding telephone |
| 02/27/1997 | WO1997007624A1 Echo cancelling using signal preprocessing in an acoustic environment |
| 02/19/1997 | EP0758830A2 Subband acoustic echo canceller |