Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 9 - Arrangements for interconnection not involving centralised switching
Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105)
09/1998
09/11/1998WO1998039905A2 A system and method for providing high terminal coupling loss in a handsfree terminal
09/11/1998WO1998039894A1 Method and apparatus for telephone intercom doorbell response system
09/11/1998WO1998030009A3 An ac-center clipper for noise and echo suppression in a communications system
09/11/1998CA2281099A1 Method and apparatus for telephone intercom doorbell response system
09/08/1998US5805696 Echo canceller adaptation technique
09/02/1998EP0862312A2 A "plug and play" telephone system
09/02/1998EP0862311A2 A "plug and play" telephone system
09/02/1998EP0861547A1 Information distribution system
09/02/1998EP0861531A1 Acoustic echo elimination in a digital mobile communications system
09/01/1998US5801754 Interactive theater network system
08/1998
08/27/1998WO1998037678A2 An electronic voice mail message handling system
08/26/1998CN1191650A Apparatus and method for increasing intelligibility of loudspeaker output and for echo cancellation in telephone
08/25/1998US5799078 Echo canceller
08/25/1998US5799074 Communication terminal having function for displaying originator identification data
08/25/1998US5799067 Digital telephone
08/20/1998WO1998036515A2 Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input
08/18/1998US5796819 Echo canceller for non-linear circuits
08/18/1998US5796818 Dynamic optimization of handsfree microphone gain
08/12/1998CN1190305A Two wire interphone system with plurality of monitors
08/11/1998US5794018 System and method for synchronizing data streams
08/11/1998US5793863 Telephone having a speech band limiting function
08/11/1998US5793855 Integrated wireless communication system
08/05/1998EP0856221A1 A telecommunications switch
08/04/1998US5790657 Echo suppressor capable of suppressing an echo resulting from acoustic coupling without spoiling a natural sound of conversation
08/04/1998US5790632 Method and apparatus for echo canceling accounting for companding induced quantization error
07/1998
07/30/1998WO1998033311A1 Apparatus and method for non-linear processing in a communication system
07/29/1998CN1189266A Method, device, DSP and modem for efficient echo canceler phase roll tracking
07/28/1998US5787183 Microphone system for teleconferencing system
07/28/1998US5787165 Handsfree radiotelephone having dynamic path attenuation control for echo suppression
07/28/1998US5787115 Key telephone system without common control
07/23/1998DE19716598C1 Door entryphone system with two-wire bus
07/22/1998EP0854626A1 Method and device for echo cancellation
07/22/1998EP0854625A2 Apparatus and method for noise reduction for a full-duplex speakerphone or the like
07/21/1998US5784685 Wireless intercom communication system and method of using same
07/21/1998US5784446 Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
07/21/1998CA2073066C Private telephone system with simplified command feature
07/16/1998WO1998019441A3 Distributed audio signal processing in a network experiencing transmission delay
07/14/1998US5781622 Two-line apparatus for telephone intercom
07/09/1998WO1998030009A2 An ac-center clipper for noise and echo suppression in a communications system
07/08/1998EP0852094A1 Method of and apparatus for off-hook signalling between telephones or adjuncts on the same loop
07/08/1998EP0852093A1 Coordinating telephones or adjuncts on the same loop
07/08/1998CN1187271A Acoustic echo elimination in a digital mobile communications system
07/07/1998US5778085 Audio conference device having echo canceller
07/07/1998CA2138810C Method of and apparatus for identifying a system with adaptive filter
07/02/1998WO1998028857A1 Double talk and echo path change detection in a telephony system
06/1998
06/30/1998US5774674 System for negotiating at least two sets of video capabilities between two nodes to perform video conferencing between the nodes according to the selected set
06/30/1998US5774562 Method and apparatus for dereverberation
06/30/1998US5774561 Subband acoustic echo canceller
06/25/1998DE19652472A1 Electronic circuit arrangement for AC transformer
06/24/1998EP0849922A2 Telephone communication system
06/23/1998US5771440 Communication device with dynamic echo suppression and background noise estimation
06/23/1998US5771277 Modem for connection to a telephone line
06/18/1998WO1998016050A3 A telecommunications system, a subscriber unit, and a television set comprising a subscriber unit
06/18/1998WO1998007263A3 Dynamic optimization of handsfree microphone gain
06/17/1998EP0848534A2 Communications adapter to link a control computer to a plurality of telephone sets
06/17/1998EP0847645A1 Voice activity detector for half-duplex audio communication system
06/16/1998US5768366 High voltage message waiting circuit
06/16/1998US5768364 Software speakerphone system and method of operating a speakerphone
06/16/1998US5768262 Methods for performing intelligent network services with an ISDN network terminator located at a subscriber's premise
06/10/1998EP0847180A1 Double talk detector
06/10/1998DE19710535C1 Door entry system with door station and several apartment stations
06/09/1998US5764752 Off-hook telephone clearing system
06/09/1998US5764743 Method of controlling operation of a multi-line telephone apparatus
06/02/1998US5761320 Audio distribution system having programmable zoning features
06/02/1998US5761318 Method and apparatus for multi-channel acoustic echo cancellation
06/02/1998US5761287 Digital key telephone connecting apparatus and method in a digital key telephone system
05/1998
05/27/1998EP0843934A1 Arrangement for suppressing an interfering component of an input signal
05/26/1998US5757905 Telephone set with circuit for suppression of howling and echo
05/26/1998US5757898 Information processing and communication apparatus
05/20/1998EP0843455A2 Method and apparatus for adaptive echo cancellation
05/20/1998EP0565526B1 Adaptive acoustic echo canceller
05/20/1998CN1182330A Echo Controlling apparatus of video conferencing system and control method using the same
05/20/1998CN1182322A Door calling interphone with anti-theft function
05/20/1998CN1182321A Door calling interphone with anti-theft function
05/19/1998US5754642 Telephone terminal having multiple handsets
05/19/1998US5754637 Collective house interphone system and method therefore
05/15/1998CA2219347A1 Method of adaptively adjusting the coefficients of a digital filter in an echo canceller
05/14/1998WO1998020668A1 Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
05/14/1998CA2270543A1 Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
05/13/1998EP0841799A2 Stereophonic acoustic echo cancellation using non-linear transformations
05/07/1998WO1998019441A2 Distributed audio signal processing in a network experiencing transmission delay
05/07/1998WO1998019436A1 Simulating changes in telephone subscriber line
05/07/1998WO1997033419A3 Method and apparatus for adaptive volume control for a radiotelephone
05/07/1998DE19650410C1 Noise and echo suppression method for hands-free telephone communication
05/07/1998DE19644735A1 Entryphone system e.g. for building with several flats
05/06/1998EP0840466A2 Echo canceller control in a satellite communication system
05/06/1998EP0839428A1 Reconfigurable on-demand telephone and data line system
05/06/1998CN2281048Y Fully-automatic telephone connector
05/05/1998US5748722 Collective-house control system employing an interface circuit for alternative mark inversion control communication
04/1998
04/30/1998DE19746258A1 Echosteuervorrichtung eines Videokonferenzsystems und zugehöriges Steuerverfahren Echo control device of a video conferencing system and related control method
04/25/1998CA2188843A1 Connecting arrangement for reducing induced noise
04/23/1998WO1998017035A1 System and method for internetworking devices
04/21/1998US5742771 Method to ensure the confidentiality of a vocal link and telecommunications local area network implementing the method
04/21/1998US5742596 Network based distributed PBX system
04/16/1998WO1998016050A2 A telecommunications system, a subscriber unit, and a television set comprising a subscriber unit
04/16/1998WO1998015901A1 System for dynamically adapting the length of a filter
04/16/1998DE19650695C1 Power supply for electrical door
04/15/1998EP0835563A2 System for coupling telephony signals transmitted through a broadband communications network to a telephony network interface
04/09/1998WO1998015095A1 Structure and method for controlling multiple customer premises equipments on a subscriber's telephone line
04/09/1998DE19639580A1 Acoustic echo reduction method for hands-free telephone set
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