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)
11/1999
11/30/1999US5995591 Connecting arrangement for reducing induced noise
11/24/1999EP0691059A4 Secure access telephone extension system and method
11/23/1999US5991634 "Plug and play" telephone system
11/23/1999US5991293 Circuit arrangement for providing internet connectivity to a computer in a key telephone system
11/23/1999CA2185175C Hierarchical switch support of services for subscribers based on organizational membership
11/18/1999WO1999059320A1 A method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors
11/18/1999WO1999052255A3 Method for setting up a connection between a mobile radio network and a destination call number in a private communication network
11/18/1999CA2331892A1 A method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors
11/17/1999EP0890293A4 Sampled chamber transducer with enhanced low frequency response
11/17/1999EP0885546A4 Wearable audio system with enhanced performance
11/17/1999CN1046611C System and method to identify the terminating directory number at customer premises
11/16/1999US5987143 Method and apparatus for erasing acoustic echo
11/16/1999US5987109 Key telephone apparatus with call distribution function
11/11/1999WO1999057937A1 Headset control system for operating a microcontroller bassed device
11/11/1999WO1999057871A1 Radiophone
11/11/1999WO1999057868A2 A telephone line interface circuit with ac and dc line adjustment
11/09/1999US5982880 Method and apparatus for canceling tone signal noise generated when using a speakerphone in a digital key telephone apparatus
11/09/1999US5982755 System and method for providing high terminal coupling loss in a handsfree terminal
11/03/1999EP0698328A4 Multimedia communications network
11/02/1999US5978473 Gauging convergence of adaptive filters
11/02/1999CA2192498C Microphone expansion for background noise reduction
10/1999
10/28/1999WO1999055065A1 Telephone control module and user site network and methods of operation
10/28/1999DE19818609A1 Noise filtering method for handsfree system
10/27/1999EP0951798A1 Acoustic feedback correction
10/27/1999EP0951796A1 Method and apparatus for communicating engineering orderwire information over synchronous communications network
10/27/1999EP0812504B1 Hands-free telephone terminal speaker gain correction
10/26/1999USRE36354 Key telephone system with virtual private lines
10/21/1999WO1999053717A2 Communication system
10/21/1999WO1999053674A1 Echo cancellation
10/21/1999WO1999053673A1 Teleconferencing system
10/21/1999DE19817161A1 Door answering system with door station and several speech points in the dwelling
10/20/1999EP0950309A2 An ac-center clipper for noise and echo suppression in a communications system
10/19/1999US5970137 Loudspeaker gain correction for a hands-free telephone terminal
10/14/1999WO1999052255A2 Method for setting up a connection between a mobile radio network and a destination call number in a private communication network
10/14/1999DE19815961A1 Elektronische Schaltung zur Mehrkanalverarbeitung von Grundfunktionen An electronic circuit for multi-channel processing of basic functions
10/14/1999DE19815699A1 Communication system for connection to door call installation
10/14/1999DE19815430A1 Verfahren zum Verbindungsaufbau von einem Mobilfunknetz zu einer Zielrufnummer eines privaten Kommunikationsnetzes Method for setting up a wireless network to a destination telephone number of a private communication network
10/14/1999DE19811064C1 Door intercom system
10/13/1999EP0949795A2 Digital voice enhancement system
10/13/1999EP0949773A2 Electronic circuit for multichannel processing of elementary functions
10/12/1999US5966438 Method and apparatus for adaptive volume control for a radiotelephone
10/09/1999CA2267598A1 Electronic circuit for multichannel processing of basic functions
10/06/1999EP0947057A1 Double talk and echo path change detection in a telephony system
10/06/1999EP0878060B1 A system and method for performing echo cancellation in a communications network employing a mixed mode lms adaptive balance filter
10/05/1999US5963639 Telephone having an audio response function
10/05/1999US5963627 Communication terminal having function for displaying originator identification data
10/05/1999US5963246 Multi-point video conference system
09/1999
09/29/1999EP0946036A1 Vocal activity detection in the presence of parasitic source of sound
09/29/1999EP0946035A2 Two wires intercom system
09/28/1999US5959977 Apparatus for embodying combined time switching and conference calling functions
09/28/1999US5959413 Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same
09/28/1999CA2161358C Method and apparatus for multi-channel acoustic echo cancellation
09/23/1999WO1999041897A3 Method for improving acoustic noise attenuation in hand-free devices
09/22/1999EP0944228A1 Method and apparatus for multi-channel acoustic echo cancellation
09/16/1999DE19818611C1 Frequency range equalization method for microphone array e.g. for hands-free phone device in automobile
09/16/1999DE19811063A1 Video door call installation for house or flat
09/16/1999DE19811062A1 Communications system enables audio and video communications and control of a camera at a first station without altering the use of a first signal transmission arrangement
09/14/1999CA2129102C Feedback level estimator between loudspeaker and microphone
09/10/1999WO1999035814A3 Methods and apparatus for improved echo suppression in communications systems
09/07/1999US5949891 Filtering audio signals from a combined microphone/speaker earpiece
09/07/1999CA2183118C Subband acoustic echo canceller
09/01/1999CN2336524Y Frequency converter for two-wire gate-controlled walkie-talkie
09/01/1999CN2336523Y Plug switcher for joining up modem, telephone and fax according their characteristics
08/1999
08/31/1999US5946616 Concurrent wireless/landline interface apparatus and method
08/26/1999DE19806015A1 Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen A method for improving the acoustic sidetone suppression in hands-free
08/24/1999US5943420 Power-up system for line-powered telephones
08/19/1999WO1999041898A1 Method for improving acoustic noise attenuation in hand-free devices
08/19/1999WO1999041897A2 Method for improving acoustic noise attenuation in hand-free devices
08/18/1999EP0935871A2 Distributed audio signal processing in a network experiencing transmission delay
08/18/1999CN1226349A Echo canceler for non-linear circuit
08/17/1999US5940499 Voice switch used in hands-free communications system
08/17/1999US5940486 Two-way communication system with selective muting
08/17/1999CA2155220C Secure access telephone extension system and method
08/12/1999DE19805942C1 Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen A method for improving the acoustic sidetone suppression in hands-free
08/11/1999CN1225771A Processing device network
08/10/1999US5937061 Power saving control apparatus for simple electronic exchange system
08/10/1999US5937060 Residual echo suppression
08/10/1999US5937058 Coordinating telephones or adjuncts on the same loop
08/10/1999US5937046 Method of selectively connecting a received telephone call by utilizing a calling party number in a keyphone system
08/10/1999US5937009 Sub-band echo canceller using optimum wavelet packets and cross-band cancellation
08/05/1999WO1999039497A1 Generating calibration signals for an adaptive beamformer
08/03/1999US5933493 Telecommunications system, a subscriber unit, and a television set comprising a subscriber unit
08/03/1999US5933482 Method and apparatus for designating and making an automatic call for a pair of key telephone sets in a key telephone exchange system
08/03/1999US5933479 Remote service system
08/03/1999CA2174271C Microphone selection process for use in a multiple microphone voice actuated switching system
08/03/1999CA2169907C Hands-free phone converter
07/1999
07/28/1999EP0872028A4 Spectral noise compensation for echo cancellation
07/27/1999US5930346 Extended public switched telephone network architecture with enhanced subscriber control on call setup
07/27/1999US5930231 Block spectrum receiver for a broadband communications system
07/22/1999DE19800615A1 Control in door call installation
07/21/1999EP0930726A2 Method for echo cancelling with adaptive FIR filters
07/20/1999US5926532 Mask apparatus for divers
07/16/1999CA2257550A1 Process for echo suppression with adaptive fir filters
07/15/1999WO1999035814A2 Methods and apparatus for improved echo suppression in communications systems
07/15/1999WO1999035813A1 Methods and apparatus for providing comfort noise in communications systems
07/15/1999WO1999035812A1 Methods and apparatus for controlling echo suppression in communications systems
07/15/1999WO1999035608A1 Method and apparatus for image capture, compression and transmission of a visual image
07/15/1999WO1999022460A3 Method and device at stereo acoustic echo cancellation
07/15/1999CA2341160A1 Method and apparatus for image capture, compression and transmission of a visual image
07/15/1999CA2317425A1 Methods and apparatus for providing comfort noise in communications systems
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