H04M 9 - Arrangements for interconnection not involving centralised switching

Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105)
04/1998
04/07/1998	US5737409 Echo removing apparatus
04/07/1998	US5737408 Echo cancelling system suitable for voice conference
04/07/1998	US5737407 Voice activity detector for half-duplex audio communication system
04/07/1998	US5737390 Digital exchange system with function of displaying operation state of system
04/02/1998	DE19651463C1 Studio talkback system combination circuit e.g. for broadcasting
04/01/1998	CN1178053A Method of and apparatus for echo reduction in a hands-free cellular radio communication system
03/1998
03/31/1998	US5734987 Noise-controlled communication apparatus
03/31/1998	US5734715 Process and device for adaptive identification and adaptive echo canceller relating thereto
03/31/1998	US5734707 Telephone system
03/26/1998	WO1998012837A1 Information distribution system
03/24/1998	US5732134 Doubletalk detection by means of spectral content
03/24/1998	US5732129 Method of improving computer communication speed in key telephone system
03/19/1998	WO1998004079A3 Echo canceler for non-linear circuits
03/19/1998	DE19637731A1 Entryphone system for gate and door
03/11/1998	CN1176034A Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
03/05/1998	WO1997027550A3 Communication system with multicarrier telephony transport
02/1998
02/26/1998	WO1998008203A1 Patient/nurse call system
02/26/1998	CA2263428A1 Patient/nurse call system
02/24/1998	US5721772 Subband acoustic echo canceller
02/24/1998	US5721771 Hands-free speaking device with echo canceler
02/24/1998	US5721730 Spectral noise compensation for telecommunication signal processing
02/19/1998	WO1998007263A2 Dynamic optimization of handsfree microphone gain
02/18/1998	CN1173768A Coincidence quasi duplex centre-less frequency division multiple address and noise-resistance carrier communication system
02/17/1998	US5719867 Plural telephony channel baseband signal demodulator for a broadband communications system
02/12/1998	WO1997049196A3 Echo suppressor and non-linear processor of echo canceller
02/10/1998	US5717751 Telephone apparatus and private branch exchange apparatus
02/03/1998	US5715310 Apparatus and method for echo attenuation
02/03/1998	US5715309 Conversion of compressed speech codes between attenuated and unattenuated formats
02/03/1998	US5715296 Concurrent wireless/landline interface apparatus
01/1998
01/29/1998	WO1998004079A2 Echo canceler for non-linear circuits
01/29/1998	DE19630345A1 Telecommunication apparatus e.g. for providing status information of house
01/28/1998	EP0821513A1 Sub-band acoustic echo canceller
01/27/1998	US5712909 Key telephone apparatus with automatic call distribution function
01/22/1998	WO1998002999A1 Processing device network
01/13/1998	US5708722 Microphone expansion for background noise reduction
01/06/1998	US5706344 Acoustic echo cancellation in an integrated audio and telecommunication system
12/1997
12/31/1997	CN1169077A Apparatus and method for providing telephone user with control of threshold volume at which user's voice will take control of half-duplex speakerphone conversation
12/24/1997	WO1997049196A2 Echo suppressor and non-linear processor of echo canceller
12/23/1997	CA2115733C System and method to identify the terminating directory number at the customer premises
12/23/1997	CA2114868C Conferencing arrangement for compressed information signals
12/23/1997	CA2088558C Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors
12/18/1997	WO1997048197A3 Communication system with multicarrier telephony transport
12/18/1997	WO1997048197A2 Communication system with multicarrier telephony transport
12/17/1997	EP0813331A2 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
12/17/1997	EP0812504A1 Hands-free telephone terminal speaker gain correction
12/16/1997	US5699423 Telephone set in which an echo signal is effectively cancelled in spite of being provided with a plurality of sound producing units
12/16/1997	US5699419 Analog multibutton telephone keysets
12/16/1997	CA2114039C Pushbutton telephone system
12/16/1997	CA2107754C Shared line appearance across a plurality of switching systems
12/11/1997	CA2207529A1 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
12/10/1997	EP0811288A1 Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
12/10/1997	CN1167393A One line multi-extension interphone controller
12/09/1997	US5696821 Radiotelephone and method therefor for substantially reducing audio feedback
12/09/1997	US5696819 Speech communication apparatus
12/04/1997	WO1997045995A1 Arrangement for suppressing an interfering component of an input signal
12/04/1997	WO1997045994A1 Telephone system
12/03/1997	EP0605549B1 Handsfree telephone apparatus
12/02/1997	US5694461 Method for controlling long distance calling using a multi-frequency receiver
12/02/1997	US5694460 Circuit and method for reducing common mode interference in telephone instruments
11/1997
11/27/1997	WO1997030555A3 Multiple application switching platform and method
11/25/1997	US5692042 Speakerphone controlled by a comparator with hysteresis
11/23/1997	CA2177098A1 Integrated telephone and intercom system
11/20/1997	DE19620363A1 Video entryphone operation method
11/19/1997	EP0808052A2 Method for automatic adjustment of a circuit for automatic switching between receiving mode and transmitting mode in a hands-free device of a communication terminal
11/12/1997	EP0806092A1 A directional acoustic signal processor and method therefor
11/11/1997	US5687245 Sampled chamber transducer with enhanced low frequency response
11/11/1997	US5687229 Method for controlling echo canceling in an echo canceller
11/11/1997	US5687177 Tone blocking using variable delay buffer
11/05/1997	EP0805583A1 Hand-free telephone set
11/05/1997	EP0723733A4 Microphone system for teleconferencing system
11/05/1997	CN2266848Y Calling system connector for telephone
10/1997
10/29/1997	EP0804011A2 Hands-free communication apparatus
10/28/1997	US5682434 Wearable audio system with enhanced performance
10/23/1997	DE19615862A1 Loud-speaker system drive circuit
10/21/1997	US5680589 Ring communication system using ISDN
10/21/1997	US5680450 Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
10/21/1997	CA2075843C Echo canceller
10/16/1997	WO1997038552A1 Acoustic feedback correction
10/15/1997	EP0800742A1 Smart phone integration with computer systems
10/15/1997	EP0800739A1 Hands-free device for a digital communications terminal
10/14/1997	CA2100427C Graphical user interface workstation
10/07/1997	US5675641 Dual-mode speaker telephone
10/02/1997	WO1997036390A1 Block spectrum receiver for a broadband communications system
09/1997
09/30/1997	US5673393 Managing bandwidth over a computer network having a management computer that allocates bandwidth to client computers upon request
09/24/1997	EP0797339A2 Method and circuit for improving the transmission properties of a transmission link subjected to echo in a telecommunication network
09/24/1997	CN1160471A Mobile telecommunications system
09/23/1997	CA2118879C Low-delay stubband adaptive filter
09/18/1997	WO1997034440A1 Method and apparatus for communicating engineering orderwire information over synchronous communications network
09/18/1997	DE19610286A1 Communication terminal with programmable function keys
09/16/1997	US5668871 Audio signal processor and method therefor for substantially reducing audio feedback in a cummunication unit
09/12/1997	WO1997033419A2 Method and apparatus for adaptive volume control for a radiotelephone
09/12/1997	WO1997024853A3 Echo reduction for telephone communication system
09/09/1997	US5666429 Energy estimator and method therefor
09/09/1997	US5666428 For use in a facility
09/03/1997	EP0793372A1 A hands-free phone converter
09/03/1997	EP0792550A1 Conversion of compressed speech codes between attenuated and unattenuated formats
09/03/1997	CN2261699Y Intercom pager
09/02/1997	US5664021 Microphone system for teleconferencing system
09/02/1997	US5664011 Echo canceller with adaptive and non-adaptive filters
09/02/1997	US5663955 Echo canceller system with shared coefficient memory

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