H04M 9 - Arrangements for interconnection not involving centralised switching

Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105)
01/1995
01/31/1995	US5386463 Low noise multi-elevator communication system and method
01/24/1995	US5384843 Hands-free telephone set
01/12/1995	WO1995001681A1 Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
01/10/1995	US5381475 Arrangement for suppressing echoes in a digital portable telephone
01/10/1995	US5381468 Telephone exchange including less display elements than channels
01/03/1995	US5379450 Radio loudspeaker telephone device capable of automatically preventing howling on execution of calling operation
01/03/1995	US5379280 Conferencing system for distributed switching network
12/1994
12/21/1994	EP0630105A2 Voltage controlled attenuator for speakerphones
12/19/1994	EP0659319A4 Telephone adapter for telephone sets.
12/08/1994	WO1994028667A1 Telephone power system
12/07/1994	EP0627860A1 Television monitoring apparatus
12/07/1994	EP0627840A2 Echo canceller
12/07/1994	EP0627839A1 Speakerphone with event driven control circuit
12/07/1994	EP0627825A2 Multi-channel echo cancelling method and a device thereof
12/07/1994	EP0627139A1 Feedback level estimator between loudspeaker and microphone
12/06/1994	US5371789 Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors
11/1994
11/29/1994	US5369692 Page party system
11/15/1994	US5365583 Method for fail-safe operation in a speaker phone system
11/15/1994	US5365572 Cordless key telephone system with multiple tenant facility
11/09/1994	CN2182501Y Telephone extension with multi-custom intercommunicating apparatus
11/08/1994	US5363434 Audio distribution system
11/03/1994	DE3690413C2 Intermediate repeater for use in two-wire links of a dial-up telephone network and method for controlling the amplification of said repeater
11/01/1994	CA2048650C Speakerphone for cellular telephones with howl prevention, detection, elimination and determination
10/1994
10/27/1994	WO1994024807A1 Multimedia communications network
10/26/1994	CN1094208A Computerized remote-control walkie-talkie with common carrier
10/25/1994	US5359656 In a digital communication system
10/25/1994	US5359653 Circuit arrangement for controlling the volume range of a voice terminal
10/25/1994	US5359598 Voice server for digital communication network
10/18/1994	CA2058106C Method of recovering speech path of pre-engaged call on restarting keyphone exchange system
10/18/1994	CA2014864C Training method for an echo canceller for use in a voice conference system
10/13/1994	WO1994023508A1 A home and small business phone system for operation on a single internal twisted pair line
10/12/1994	CN2179672Y Building public security door with alarming function
10/11/1994	CA2013384C Facsimile apparatus
10/04/1994	US5353348 Double echo cancelling system
10/04/1994	CA2027212C Telephone conferencing arrangement
10/04/1994	CA2021793C Hands-free telephone
09/1994
09/29/1994	WO1994022257A1 Secure access telephone extension system and method
09/28/1994	EP0617537A1 Conferencing arrangement for compressed information signals
09/21/1994	EP0615674A1 Network echo canceller
09/14/1994	EP0615374A1 Process and apparatus for echo processing between two ways of transmission having mutual couplings
09/14/1994	EP0615340A1 Low-delay subband adaptive filter
09/14/1994	EP0527141B1 Speech-transmission system
09/14/1994	CN2177311Y Multifunction building calling device
09/07/1994	EP0614304A1 Process for improvement of acoustic feedback suppression in electro-acoustic devices
09/06/1994	US5345510 Integrated speaker supervision and alarm system
08/1994
08/31/1994	EP0613319A1 Multimicrophone sound pick-up device and associated signal processing device
08/30/1994	US5343521 Device for processing echo, particularly acoustic echo in a telephone line
08/24/1994	EP0612177A1 Circuit arrangement for the activation of apparatuses via a transmission line
08/23/1994	US5341374 Communication network integrating voice data and video with distributed call processing
08/18/1994	WO1994018780A1 A telephone system and adapter therefor
08/18/1994	CA2155665A1 A telephone system and adapter therefor
08/17/1994	EP0385986B1 Method of processing calls
08/16/1994	US5339360 Method of synchronizing LEDS between a digital telephone and remote options
08/16/1994	CA2027138C Loudspeaking telephone station including directional microphone
08/09/1994	CA1331397C Call appearance reservation arrangement
08/02/1994	CA2017898C Echo canceler-suppressor speakerphone
08/02/1994	CA2004171C Computer controlled adaptive speakerphone
07/1994
07/28/1994	DE4317701C1 Telecommunication system with stored-program control and memory units
07/27/1994	EP0607361A1 Audio processing system for teleconferencing system
07/26/1994	US5333182 Arbitrary selecting of a terminal to be called in key telephone systems
07/26/1994	CA2036078C Sub-band acoustic echo canceller
07/21/1994	WO1994017603A1 Speech communication system
07/19/1994	CA2004170C Acoustic calibration arrangement for a voice switched speakerphone
07/19/1994	CA2004169C Self calibration arrangement for a voice switched speakerphone
07/19/1994	CA2004168C Computer controlled speakerphone for adapting to a communication line
07/13/1994	EP0605549A1 Handsfree telephone apparatus
07/13/1994	EP0462254B1 Echo canceller
07/12/1994	US5329587 Low-delay subband adaptive filter
07/12/1994	CA2001277C Hands free telecommunications apparatus and method
07/07/1994	DE4302164A1 Signalling arrangement esp. for door=bell installation with loudspeaker
07/05/1994	US5327496 Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
07/05/1994	US5327483 Cordless phone and cordless phone system using such cordless phone
06/1994
06/28/1994	CA2028791C Telephone system
06/23/1994	DE4242463A1 Operating procedure for telecommunications terminal units
06/22/1994	EP0602856A2 Shared line appearance across a plurality of switching systems
06/21/1994	US5323459 Multi-channel echo canceler
06/21/1994	US5323458 Echo cancellation in a full-duplex speakerphone
06/14/1994	US5321848 Drive-up station full duplex communication system and method of using same
06/14/1994	US5321746 Adjustable gain range current mirror
06/08/1994	EP0600164A1 Method for the improvement of transmission properties of an electro-acoustic device
06/07/1994	US5319704 Control circuit for voltage controlled attenuator for speakerphones
06/01/1994	EP0599653A2 Digital sound level control in a telephone system
06/01/1994	EP0524965B1 Private telephone system with simplified command feature
05/1994
05/31/1994	CA2018836C Training method for an echo canceller for use in a voice conference system
05/26/1994	WO1994011994A1 Television monitoring apparatus
05/24/1994	US5315639 Hands-free intercom system
05/18/1994	EP0597201A1 Apparatus and method for noise reduction for a full-duplex speakerphone or the like
05/18/1994	CN2165585Y Bridging mutually-dialing telephone
05/11/1994	WO1994010788A1 Method of synchronizing leds between a digital telephone and remote options
05/10/1994	CA2020789C Noise mitigation and mode switching in communications terminals such as telephones
05/03/1994	US5309509 Graphical user interface workstation
05/03/1994	US5309028 Call coverage arrangement in an ISDN switching system
04/1994
04/26/1994	US5307405 Network echo canceller
04/20/1994	EP0592787A1 Procedure for improvement of acoustic feedback suppression of electro-acoustic devices
04/20/1994	CN1085705A Network echo canceller
04/19/1994	US5305307 Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths
04/14/1994	WO1994008418A1 Network echo canceller
04/13/1994	CN2162050Y Wire bidirectional intercom
04/13/1994	CN2162049Y Program control telephone set for user net
04/12/1994	US5303239 Telephone system

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