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)
07/1999
07/14/1999EP0929174A2 Voice switching system capable of improving a quality of conversation
07/14/1999CN1223036A Echo suppressor and non-linear processor of echo canceller
07/13/1999US5923749 Method and system for eliminating acoustic echos in a digital telecommunication system
07/13/1999US5923743 Single-wire data distribution system and method
07/07/1999CN1222035A Flat display and TV interphone system using the same
07/06/1999US5920615 Telecommunications switch
06/1999
06/30/1999CN2327123Y Extension telephone for subscriber
06/24/1999WO1999031858A1 Communication system
06/22/1999US5915014 Communication system
06/17/1999DE19856589A1 Flat-screen CRT video display unit with deflection module, for e.g. video intercom
06/16/1999EP0922273A1 Patient/nurse call system
06/16/1999CN2324715Y Colinear calling extension controlled by one-chip computer
06/15/1999US5913062 Conference system having an audio manager using local and remote audio stream state machines for providing audio control functions during a conference session
06/15/1999US5912923 System for transmitting coded speech signals
06/10/1999WO1999029094A1 Method and apparatus for cancelling echo originating from a mobile terminal
06/10/1999WO1999029093A1 Method and device for suppressing echo in a hands free device such as a telephone
06/08/1999US5911124 Method and apparatus for applying echo mitigation in a communication device
06/02/1999EP0919096A1 Method for cancelling multichannel acoustic echo and multichannel acoustic echo canceller
06/02/1999DE19753224A1 Verfahren und Vorrichtung zur Echounterdrückung bei einer Freisprecheinrichtung, insbesondere für ein Telefon Method and apparatus for echo cancellation with hands-free, especially for a phone
06/01/1999US5909489 Method of and circuit arrangement for improving the transmission properties of an echo affected transmission link in a telecommunications network
06/01/1999US5909384 System for dynamically adapting the length of a filter
05/1999
05/27/1999WO1999026403A1 Echo canceller having improved non-linear processor
05/27/1999WO1999026402A1 Echo canceller employing dual-h architecture having improved double-talk detection
05/27/1999WO1999026401A1 Echo canceller employing dual-h architecture having improved non-linear echo path detection
05/27/1999WO1999026400A1 Echo canceller employing dual-h architecture having improved coefficient transfer
05/27/1999WO1999026399A1 Echo canceller employing dual-h architecture having split adaptive gain settings
05/27/1999WO1999026390A1 Echo canceller employing dual-h architecture having variable adaptive gain settings
05/27/1999WO1999026355A1 Acoustic echo cancellation equipped with howling suppressor and double-talk detector
05/27/1999CA2614594A1 Echo canceller employing dual-h architecture having improved non-linear echo path detection
05/27/1999CA2614488A1 Echo canceller employing dual-h architecture having improved non-linear echo path detection
05/27/1999CA2592931A1 Echo canceller employing dual-h architecture having variable adaptive gain settings
05/27/1999CA2592930A1 Echo canceller employing dual-h architecture having variable adaptive gain settings
05/27/1999CA2590818A1 Echo canceller employing dual-h architecture having variable adaptive gain settings
05/27/1999CA2580432A1 Echo canceller employing dual-h architecture having improved non-linear echo path detection
05/27/1999CA2307678A1 Echo canceller employing dual-h architecture having split adaptive gain settings
05/26/1999EP0917796A2 Dynamic optimization of handsfree microphone gain
05/26/1999EP0917785A1 Processing device network
05/26/1999CN2321178Y Non-hangup telephone main machine
05/25/1999US5907538 Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input
05/19/1999EP0916191A2 A wire bound telecommunications device and a power supply circuit
05/12/1999EP0915609A2 Door entry security system
05/12/1999EP0914721A2 Echo canceler for non-linear circuits
05/12/1999EP0648397A4 Method for fail-safe operation in a speaker phone system.
05/12/1999CN2318771Y Wire duplex loud-speaker intercome telephone switchboard
05/11/1999CA2169143C Key telephone system capable of simulation by button operations
05/11/1999CA2132496C Digital exchange system with function of displaying operation state of system
05/06/1999WO1999022460A2 Method and device at stereo acoustic echo cancellation
05/04/1999US5901230 Hands-free communication method for a multichannel transmission system
05/04/1999CA2168341C An audio processing system for point-to-point and multipoint teleconferencing
04/1999
04/28/1999CN1215540A Acoustic feedback correction
04/24/1999CA2249488A1 Door entry security system
04/22/1999WO1998051066A3 Acoustic echo canceler
04/21/1999EP0910202A2 Method for establishing an intercom connection and device
04/20/1999US5896450 Automatically variable circuit of sound level of received voice signal in telephone
04/20/1999CA2165704C Telephone message center
04/15/1999DE19744868A1 Telephone and cordless system with telephone function
04/14/1999CN1214171A Appts. and method for non-linear processing in communication system
04/13/1999US5894513 Hands-free communication unit having residual acoustic echo suppression means for suppressing residual echoes which have been left unremoved by an echo canceller, a bilateral communication system and a method for suppressing residual echoes
04/08/1999WO1999017526A1 Echo compensation method, echo compensation device and telecommunication device
04/08/1999DE19744130A1 Car speech transceiver with inner microphone and loudspeaker
04/07/1999CN1213483A Method and apparatus for communicating engineering orderwire information over synchronous communications network
04/07/1999CN1213481A Digital button telephone system and extension terminal for the same
03/1999
03/31/1999CN1212804A Method and apparatus for adaptive volume control for radiotelephone
03/31/1999CN1212555A Direction transform echo canceller and method
03/31/1999CN1212550A Telephone system for voice recognition
03/30/1999US5889857 Acoustical echo canceller with sub-band filtering
03/25/1999WO1999014868A1 Echo elimination method, echo canceler and voice switch
03/24/1999EP0903913A1 Bilateral telephone system for conducting telephone conversations between conversation partners
03/24/1999EP0903726A2 Active acoustic noise and echo cancellation system
03/23/1999US5887059 System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter
03/23/1999US5887054 Play and plug telephone system
03/23/1999CA2124662C Multi-channel echo cancelling method and a device thereof
03/17/1999EP0800739B1 Hands-free device for a digital communications terminal
03/17/1999EP0627139B1 Feedback level estimator between loudspeaker and microphone
03/17/1999CN1211370A Simulating changes in telephone subsriber line
03/16/1999US5884194 Hands-free telephone
03/16/1999US5883944 "Plug and play" telephone system
03/11/1999DE19739393A1 Door entry phone and intercom
03/11/1999DE19739392A1 Door entry phone and intercom
03/11/1999CA2242510A1 Coupled acoustic echo cancellation system
03/10/1999EP0901267A2 The detection of the speech activity of a source
03/09/1999US5881143 Telephone line device
03/04/1999WO1998036515A3 Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input
03/03/1999EP0898816A2 Echo suppressor and non-linear processor of echo canceller
02/1999
02/25/1999WO1999009730A1 Method and apparatus for a host-based personal computer speakerphone
02/24/1999CN1209227A Gauging convergence of adaptive filters
02/23/1999US5875246 Distributed audio signal processing in a network experiencing transmission delay
02/23/1999US5875241 Communication system for processing caller ID information
02/23/1999CA2156964C Key telephone apparatus with automatic call distribution function
02/23/1999CA2151115C Personal phone expansion system
02/17/1999CN1208518A A method and arrangement for elimination of acoustic echoes in a telecommunication system
02/16/1999US5872839 Office line selecting technique of a telephone switching system
02/11/1999WO1999007134A1 Hand free system
02/11/1999WO1998048527A3 Echo cancellation mechanism
02/10/1999EP0895688A1 Apparatus and method for non-linear processing in a communication system
02/04/1999WO1998049782A3 A wire bound telecommunications device and a power supply circuit
02/03/1999EP0895397A2 Acoustic echo canceller
02/03/1999EP0894394A1 Telephone system
02/03/1999CN2306619Y Wired duplex loadspeaking intercom extension telephone set
02/02/1999US5867574 Voice activity detection system and method
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