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)
02/1997
02/18/1997US5604799 Switching type echo canceler
02/18/1997US5604793 Tone blocking using variable delay buffer
02/18/1997CA2099575C Adaptive acoustic echo canceller
02/13/1997WO1997002671A3 System for coupling telephony signals transmitted through a broadband communications network to a telephony network interface
02/11/1997US5602913 Robust double-talk detection
02/11/1997CA2055794C Auxiliary attenuator arrangement for use in voice-switched speakerphone and method of selectively inserting communication loss in speakerphone paths
02/06/1997WO1997004577A1 Loudspeaking telephone systems
02/05/1997CN1142302A Acoustic echo suppressor with subband filtering
02/05/1997CN1142152A Programmable concentrator carrier telephone system
02/04/1997US5600797 System for identifying new client and allocating bandwidth thereto by monitoring transmission of message received periodically from client computers informing of their current status
02/04/1997US5600714 Conference telephone using dynamic modeled line hybrid
01/1997
01/29/1997CN1141552A Software speakerphone system and method of operating speakerphone
01/28/1997US5598468 Method and apparatus for echo removal in a communication system
01/28/1997US5598466 Voice activity detector for half-duplex audio communication system
01/23/1997WO1997002671A2 System for coupling telephony signals transmitted through a broadband communications network to a telephony network interface
01/23/1997WO1997002664A1 Spectral noise compensation for echo cancellation
01/21/1997US5596631 Station controller for distributed single line PABX
01/14/1997US5594788 Telephone system and interface device
01/08/1997EP0752181A1 Frequency-domain adaptive-filter acoustic echo canceller
01/07/1997US5592547 Processing audio signals using a discrete state machine
01/07/1997US5592545 Voice enhancement system and method
12/1996
12/31/1996US5590128 Dial lists for computer-based conferencing systems
12/27/1996WO1996042156A1 Ring communication system using isdn
12/27/1996WO1996042142A1 Acoustic echo elimination in a digital mobile communications system
12/24/1996CA2086522C Speech communication apparatus equipped with echo canceller
12/19/1996WO1996041497A1 Sampled chamber transducer with enhanced low frequency response
12/19/1996WO1996041496A1 Wearable audio system with enhanced performance
12/18/1996EP0748555A1 Acoustic echo suppressor with subband filtering
12/17/1996US5586180 Method of automatic speech direction reversal and circuit configuration for implementing the method
12/17/1996US5586176 Mask apparatus for divers
12/12/1996DE19521930A1 Reduction of acoustic feedback and echoes
12/05/1996WO1996038973A1 Apparatus and method for increasing the intelligibility of a loudspeaker output and for echo cancellation in telephones
12/05/1996WO1996034484A3 Remote activity monitoring system and method
12/05/1996DE19606455A1 Verfahren zum Löschen von Geräuschen in einem Tonsignal bei der Verwendung einer Freisprecheinrichtung in einem Telephongerät mit digitalen Tasten How to delete noise in an audio signal when using a hands-free in a telephone set with digital buttons
12/04/1996EP0746134A2 Acoustic echo canceler
12/04/1996EP0746133A2 Multistage echo canceller including time variation compensation
11/1996
11/26/1996US5579389 Histogram-based processing of audio signals
11/26/1996US5579380 Method and apparatus for processing telephone calls from one line to another
11/20/1996EP0743776A2 A single-wire data distribution system and method
11/19/1996US5577116 Apparatus and method for echo characterization of a communication channel
11/13/1996EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system
11/13/1996EP0742664A2 Method for hand-free talking for a multi-channel transmission system
11/13/1996CN1135692A Echo-eliminating device
11/13/1996CA2176305A1 Hands-free communication method for a multichannel transmission system
11/12/1996US5574934 Computer-implemented process
11/06/1996EP0636071B1 Communication device for a Vehicle
11/05/1996US5572586 Communication control apparatus and method and communication exchange apparatus and method
10/1996
10/31/1996WO1996034484A2 Remote activity monitoring system and method
10/29/1996US5570423 Method of providing adaptive echo cancellation
10/24/1996DE19548602A1 Speech control arrangement for electronic equipment esp. videotelephone
10/23/1996EP0739123A2 Communication unit with residual acoustic echo suppression and method for suppressing residual echoes
10/23/1996EP0739102A2 Subband echo cancellation method using projection algorithm
10/22/1996US5568542 Intercom system
10/22/1996US5568484 Telecommunications system and method for use on commercial aircraft and other vehicles
10/17/1996WO1996032804A1 Device and method for voice conference communication
10/16/1996EP0738048A2 Subscriber equipment and method for realising and operating a digital communication network
10/15/1996US5566238 Distributed processing of audio signals
10/08/1996US5563938 Subscriber telephone diverter switch
10/08/1996CA2148897A1 Subscriber telephone diverter switch
10/02/1996EP0735737A2 Communication system with a terminal designed as a door telephone
10/02/1996EP0735733A1 Method and apparatus for spurious signal detection in a hybrid fiber/coax network architecture
10/01/1996US5561737 Voice actuated switching system
10/01/1996US5561668 Echo canceler with subband attenuation and noise injection control
10/01/1996CA2051147C Echo canceller using impulse response estimating method
09/1996
09/24/1996US5559881 Network echo canceller
09/24/1996US5559880 Circuit for hands free talking
09/24/1996US5559858 Method and apparatus for delivering secured telephony service in a hydrid coaxial cable network
09/19/1996WO1996018270A3 Dual mode wireless/landline interface apparatus and method
09/18/1996EP0732838A2 Acoustic echo cancellor
09/18/1996EP0732024A1 Voice enhancement system and method
09/17/1996US5557660 Program-controlled communication system whereby a call request is simultaneously signaled at a plurality of communication terminal equipment
09/17/1996CA2004274C Telephone agent management information system
09/12/1996WO1996027971A1 Conversion of compressed speech codes between attenuated and unattenuated formats
09/11/1996EP0731593A2 Echo removing apparatus
09/10/1996CA2093491C Key telephone system capable of regulating volume of handset
09/06/1996WO1996027255A1 Hands-free telephone terminal speaker gain correction
09/05/1996DE19548744A1 Intercom device e.g. for house, flat
09/03/1996US5553137 Method and apparatus for echo canceling in a communication system
09/03/1996US5553135 Point-to-multipoint communication system and method
09/03/1996US5553014 Adaptive finite impulse response filtering method and apparatus
08/1996
08/29/1996WO1996026592A1 Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
08/28/1996CN2234161Y Intercom for motorcycle
08/27/1996US5550901 Full-duplex adapter for PBX telephone system
08/20/1996US5548642 Optimization of adaptive filter tap settings for subband acoustic echo cancelers in teleconferencing
08/20/1996US5548592 Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same
08/13/1996US5546458 Handsfree communication apparatus
08/13/1996US5546454 Automatic call distributor with telephonic call holding system
08/08/1996DE19503515A1 Simultaneous multiplex video and audio signal transmission system for split-screen and multi-person video conference
08/07/1996EP0725527A1 Echo cancelling system suitable for voice conference
08/07/1996CN1128454A Digital key telephone connecting apparatus and method in a digital key telephone system
08/06/1996US5544242 Speakerphone with event driven control circuit
08/06/1996US5544235 In a telecommunications network
08/06/1996US5544231 Conversation recording/playback method in a key phone system
08/06/1996US5544158 Method for multiple access in a digital communication system
08/01/1996WO1996023384A1 Frequency-domain adaptive-filter acoustic echo canceller
08/01/1996CA2186281A1 Frequency-domain adaptive-filter acoustic echo canceller
07/1996
07/31/1996EP0724353A2 Echo cancellation
07/31/1996EP0723733A1 Microphone system for teleconferencing system
07/25/1996WO1996022652A1 Smart phone integration with computer systems
07/25/1996WO1996022651A1 Method of and apparatus for echo reduction in a hands-free cellular radio communication system
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