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)
07/1996
07/23/1996US5539731 Echo cancelling method and apparatus using fast projection scheme
07/16/1996US5537465 Integrated telephone and intercom system
07/16/1996US5537401 System for and method of exchanging server data in packet unit
07/11/1996WO1996021313A1 Acoustic echo suppressor with subband filtering
07/11/1996WO1996021312A1 Hands-free device for a digital communications terminal
07/11/1996WO1996021306A1 An improved telephone extension unit and system for use therewith
07/11/1996CA2183899A1 Acoustic echo suppressor with subband filtering
07/10/1996EP0721274A2 Method and apparatus for detecting a near-end speech signal
07/09/1996US5535433 Hands-free circuitry providing audio signal adjustment based on speaker volume value
06/1996
06/27/1996WO1996019897A1 Telecommunications system and method for aircraft or other vehicle
06/26/1996EP0719060A2 Control system for telecommunication installations
06/26/1996EP0719028A2 Optimization of adaptive filter tap settings for subband acoustic echo cancellers in teleconferencing
06/26/1996EP0719027A2 Method and arrangement for echo cancelling
06/26/1996CN2230068Y Pressing switch device for speaker-phone
06/25/1996US5530951 Telephone line sharing apparatus
06/25/1996US5530737 Secure access telephone extension system and method
06/19/1996EP0717547A2 Automaticaly variable circuit of sound level of received voice signal in telephone
06/19/1996CN1125025A A home and small business phone system for operation on a single internal twisted pair line
06/18/1996US5528666 Personal phone expansion system
06/18/1996CA2061929C Method and arrangement for generating tap-coefficients updating inhibit signal in speakerphone
06/18/1996CA2061388C Loudspeaker telephone device comprising a novel noise suppressing circuit
06/13/1996WO1996018270A2 Dual mode wireless/landline interface apparatus and method
06/11/1996US5526426 System and method for an efficiently constrained frequency-domain adaptive filter
06/11/1996CA2056455C Speaking apparatus having handfree conversation function
06/05/1996DE19512167C1 Telecommunication system with gateway speech terminal
06/05/1996CN1124078A Secure access telephone extension system and method
06/04/1996US5524110 Conferencing over multiple transports
05/1996
05/30/1996WO1996016501A1 An improved telephone system and interface device
05/29/1996EP0713625A1 An audio processing system for teleconferencing
05/17/1996WO1996014694A1 Method and apparatus for establishing full-duplex sound communication for a speakerphone system
05/15/1996EP0712231A2 Switching type echo canceller
05/15/1996EP0712213A2 An integrated circuit that performs multiple communication tasks
05/15/1996CN2227387Y Talk-back device for telephone exchange
05/14/1996US5517551 Telephone apparatus with dial key display for external line status
05/07/1996CA2056516C Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes
05/02/1996DE19538996A1 Estimation appts. to estimate coefficients of adaptive filter to emulate transmission characteristics of known signal
05/01/1996EP0709999A2 Method and apparatus for multi-channel acoustic echo cancellation
05/01/1996EP0709998A2 Two-wire communication system for interphones
05/01/1996EP0709958A1 Adaptive finite impulse response filtering method and apparatus
05/01/1996CN1121758A Multimedia communications network
05/01/1996CA2157708A1 Adaptive finite impulse response filtering method and apparatus
04/1996
04/30/1996US5513265 Multi-channel echo cancelling method and a device thereof
04/30/1996US5513256 Key telephone system
04/18/1996WO1996011557A1 Mobile telecommunications system
04/17/1996CN1120879A A telephone system and adapter therefor
04/11/1996DE19537313A1 Verbindungsapparat für digitale Tastentelefone und Verfahren in einem digitalen Tastentelefonsystem Connection apparatus for digital key telephones and method in a digital key telephone system
04/09/1996US5506954 PC-based conferencing system
04/09/1996US5506832 Remote confidence testing for computer-based conferencing system
04/02/1996US5504809 Communication system for use in a mine
04/02/1996CA2063037C Multi-channel echo canceling method and apparatus
03/1996
03/28/1996DE4447028C1 Free-speaking device for digital communications peripheral
03/26/1996US5502717 Method and apparatus for estimating echo cancellation time
03/21/1996WO1996008879A1 Adaption algorithm for subband echo canceller using weighted adaption gains
03/14/1996WO1996008103A1 Method and device for multilingual telecommunications
03/12/1996CA1338154C Echo cancelling device with frequency sub-band filtering
03/06/1996CN1118127A Cable management system with automatic mapping
02/1996
02/28/1996EP0698986A2 Method for adaptive echo compensation
02/28/1996EP0698328A1 Multimedia communications network
02/27/1996US5495529 Digital sound level control apparatus
02/22/1996DE4432437C1 Voice controlled intercom system with plural microphone stations
02/20/1996US5493568 Media dependent module interface for computer-based conferencing system
02/08/1996WO1996003846A1 Multi-nodal digital telephone distribution system
02/08/1996DE19526749A1 Telecommunications circuitry with transmit and receive signal paths
02/08/1996CA2195941A1 Multi-nodal digital telephone distribution system
02/07/1996EP0696126A1 Method and apparatus for estimating echo cancellation time
02/06/1996US5490210 Programmable telephone interface device
02/01/1996WO1996002998A1 Bell system and/or multiple door intercom system
02/01/1996CA2195535A1 Bell system and/or multiple door intercom system
01/1996
01/31/1996CN1115933A Bus-type telephone system
01/30/1996CA2077894C Improved audio distribution system
01/25/1996DE4425309A1 Türsprechanlage Door Phone
01/24/1996EP0693849A1 System for transmission of coded speech signals
01/24/1996EP0693238A1 A home and small business phone system for operation on a single internal twisted pair line
01/24/1996CN1115534A Telephone apparatus and private branch exchange apparatus
01/17/1996EP0692903A1 Hands-free communication apparatus with echo canceler
01/17/1996CN1115161A Personal phone expansion system
01/16/1996CA2063205C Key telephone system
01/10/1996EP0691059A1 Secure access telephone extension system and method
01/09/1996US5483584 Pushbutton telephone system
01/09/1996US5483528 TDM digital matrix intercom system
01/09/1996CA2035357C Key telephone system with enhanced connectivity
01/03/1996EP0690652A2 Method for performing intelligent network services with an ISDN network terminator
01/03/1996EP0690604A1 Method to assure the confidentiality of an audiolink and local telecommunicationnetwork carrying out this method
12/1995
12/28/1995WO1995035622A1 Low-feedback compact wireless telephone
12/28/1995CA2186264A1 Low-feedback compact wireless telephone
12/27/1995EP0689332A2 Speech control circuit used in a foldable and portable telephone
12/27/1995CN1114122A A voice activity detector for an echo suppressor and an echo suppressor
12/26/1995US5479502 Speaking apparatus having handfree conversation function
12/19/1995US5477534 Acoustic echo canceller
12/12/1995US5475731 Echo-canceling system and method using echo estimate to modify error signal
12/07/1995DE4420212A1 Transmission system for simultaneous multiple sending of several picture and sound signals
12/06/1995CN1113065A Telephone having a speech band limiting function
12/05/1995US5473686 Echo cancellation apparatus
11/1995
11/30/1995DE4418792A1 Echo compensation for transmission systems
11/29/1995EP0683953A1 A telephone system and adapter therefor
11/28/1995US5471528 Voice switched speakerphone with filters having exponential transfer function in the monitoring path
11/28/1995US5471527 In a telecommunications network
11/28/1995US5471523 Telephone call and voice processing system
11/28/1995US5471318 Multimedia communications network
11/22/1995EP0683590A1 Telephone exchange system
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