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)
02/1999
02/02/1999US5867573 Telephone handset interface with feedback control
01/1999
01/28/1999DE19731149A1 Entryphone display system
01/27/1999CN2305817Y Speech type interconnecting line talkback device
01/27/1999CN1206529A Coordinating telephones or adjuncts on the same loop
01/21/1999WO1999003091A1 Methods and apparatus for measuring signal level and delay at multiple sensors
01/21/1999WO1998043368A3 Method and apparatus for controlling echo on both sides of a connection
01/21/1999DE19730920A1 Computer system adapted for hands-free speech communications
01/21/1999DE19730816A1 Hands-free speech communication arrangement for computer
01/21/1999DE19729521A1 Noise and echo suppression method especially for hands-free apparatus
01/20/1999CN1205592A Data collecting system and communicating device used in same system
01/19/1999US5862388 Interrupt-time processing of received signals
01/13/1999EP0890293A1 Sampled chamber transducer with enhanced low frequency response
01/13/1999EP0890231A1 Block spectrum receiver for a broadband communications system
01/12/1999US5859979 System for negotiating conferencing capabilities by selecting a subset of a non-unique set of conferencing capabilities to specify a unique set of conferencing capabilities
01/12/1999US5859914 Acoustic echo canceler
01/05/1999US5857019 Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
12/1998
12/29/1998CA2058654C Data transport for internal messaging
12/23/1998WO1998058448A1 Method and apparatus for low complexity noise reduction
12/23/1998WO1998039905A3 A system and method for providing high terminal coupling loss in a handsfree terminal
12/23/1998EP0885546A1 Wearable audio system with enhanced performance
12/23/1998CN1041374C Network echo canceller
12/22/1998US5852785 Secure access telephone extension system and method in a cordless telephone system
12/22/1998US5852769 Cellular telephone audio input compensation system and method
12/20/1998CA2240915A1 Method of preventing fraudulent toll calls by key system users
12/16/1998EP0884886A2 Echo canceler employing multiple step gains
12/16/1998CN1202294A Method of and apparatus for off-hook signalling between telephoes or adjuncts on the same loop
12/16/1998CN1202051A Echo canceler employing multiple step gains
12/15/1998US5850439 Hands-free phone converter
12/15/1998US5850436 Communication between a telephone and a computer system
12/09/1998EP0882353A2 Method and apparatus for adaptive volume control for a radiotelephone
12/09/1998CN1201312A Fixed user's unit for telecommunication
12/08/1998US5848151 Acoustical echo canceller having an adaptive filter with passage into the frequency domain
12/08/1998US5848146 Audio system for conferencing/presentation room
12/08/1998CA2139538C Communication terminal having function for displaying originator identification data
12/02/1998EP0881814A1 Method for determining the step size Alpha for adjusting the convergence speed in the NLMS algorithm
12/02/1998CN1200616A Fixed subscriber unit of wireless local loop system
11/1998
11/26/1998WO1998053595A1 Method and device for reducing multi-channel acoustic echo and adapting sound to space conditions
11/25/1998EP0880261A2 Echo canceller and adapting method thereof
11/25/1998EP0880260A2 Echo/noise canceler with delay compensation
11/25/1998EP0880259A2 A circuit arrangement for providing internet connectivity to a key telephone user
11/25/1998CN1200217A A telecommunications switch
11/25/1998CN1199975A Handfree phone
11/24/1998US5841856 Hands-free telephone set
11/18/1998EP0878949A2 Hands-free telephone
11/18/1998EP0878920A2 Echo canceler employing segment-based reinitialization
11/18/1998EP0878060A1 A system and method for performing echo cancellation in a communications network employing a mixed mode lms adaptive balance filter
11/18/1998CN1199286A Echo canceler employing segment-based reinitialization
11/17/1998US5838787 Method and system for controlling echo return loss using a complementary variolosses in transmit path
11/17/1998US5838786 Intelligent acoustic systems peripheral
11/17/1998US5838777 Apparatus for auto-detecting dialing of a parallel communication device
11/17/1998US5838223 Patient/nurse call system
11/12/1998WO1998051066A2 Acoustic echo canceler
11/11/1998CN1198620A Echo/noise eliminator with delay compensation
11/10/1998US5835851 Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames
11/10/1998US5835582 Telephone call alerting system and information processing system used in such
11/05/1998WO1998049782A2 A wire bound telecommunications device and a power supply circuit
11/04/1998EP0876044A2 Electric connection system for intercom and/or video intercom installations
11/04/1998CN1198283A Arrangement for suppressing interfering component of input signal
10/1998
10/29/1998WO1998048527A2 Echo cancellation mechanism
10/29/1998WO1998037678A3 An electronic voice mail message handling system
10/28/1998EP0874514A2 Method and apparatus for cancelling multi-channel echo
10/28/1998EP0874513A2 Device for feedback suppression
10/28/1998EP0874511A2 Intercom apparatus with a plurality of bus-telephones, a door station and related mains power supply
10/28/1998EP0874510A2 Two-wire bus intercom apparatus
10/28/1998EP0873606A1 Systems for feedback cancellation in an audio interface garment
10/27/1998US5828756 Stereophonic acoustic echo cancellation using non-linear transformations
10/22/1998WO1998047276A1 Method for cancelling multichannel acoustic echo and multichannel acoustic echo canceller
10/21/1998EP0872028A1 Spectral noise compensation for echo cancellation
10/20/1998US5825777 Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same
10/20/1998US5825754 Filter and process for reducing noise in audio signals
10/15/1998DE19715282A1 Circuit arrangement especially for hands-free system
10/14/1998EP0870389A1 Simulating changes in telephone subscriber line
10/14/1998EP0870365A1 Gauging convergence of adaptive filters
10/14/1998CN1196149A Reconfigurable on-demand telephone and data line system
10/13/1998US5822417 Phone control center for a life safety network
10/13/1998CA2145699C Voice actuated switching system
10/08/1998WO1998044710A1 High voltage message waiting circuit
10/06/1998US5819183 Low-feedback compact wireless telephone
10/06/1998US5818945 Subband echo cancellation method using projection algorithm
10/06/1998US5818928 Method and circuit arrangement for detecting speech in a telephone terminal from a remote speaker
10/06/1998US5818819 Method of processing a call
10/06/1998US5818513 Multi-site video conference control system and method for controlling video conference terminals via communication lines
10/01/1998WO1998043368A2 Method and apparatus for controlling echo on both sides of a connection
09/1998
09/29/1998US5815199 Interphone with television
09/24/1998WO1998042084A1 Multi-input wireless phone with echo suppression
09/24/1998CA2283707A1 Multi-input wireless phone with echo suppression
09/23/1998EP0865701A2 A telecommunications system, a subscriber unit, and a television set comprising a subscriber unit
09/23/1998EP0865688A1 A method and arrangement for elimination of acoustic echoes in a telecommunication system
09/23/1998CN1194068A Spectral noise compensation for echo cancellation
09/23/1998CN1193863A 按键电话系统 Key Telephone System
09/22/1998US5812637 Concurrent wireless/landline interface apparatus with testing means
09/22/1998US5812535 Methods for performing intelligent network services with an ISDN network terminator located at a subscriber's premise
09/22/1998US5810450 Wheel assembly with lighting circuit
09/17/1998WO1998040974A1 Echo reducing phone with state machine controlled switches
09/17/1998CA2283590A1 Echo reducing phone with state machine controlled switches
09/16/1998EP0864214A1 Ring communication system using isdn
09/16/1998CN1193226A Echo Elimination method and echo eliminator therefor
09/15/1998US5809237 Registration of computer-based conferencing system
09/15/1998US5809111 For use in a multi-station telephone system
09/11/1998WO1998039946A1 Device and method for processing speech
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