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)
12/1990
12/22/1990CA2019563A1 Telephone
12/20/1990DE3919345A1 Attenuation control circuit for hands-free telephone station - has extra second comparator, whose minus input is coupled to tap for meter value
12/19/1990CA2019166A1 Telephone apparatus adapted to be connected to several telephone lines
12/18/1990US4979163 Echo suppression arrangement for an adaptive speakerphone
12/12/1990EP0393059A4 Method for terminating a telephone call by voice command
12/11/1990CA1277758C Communications device for building entrances
12/05/1990EP0400979A2 Speakerphone with echo canceller-suppressor
12/04/1990USRE33474 Optical fiber bandwidth limiting method
11/1990
11/27/1990CA1277046C Method of integrating one or more accessory function modules in telecommunications systems and access circuit for use therewith
11/27/1990CA1277016C Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones
11/14/1990EP0396886A2 Current switch for use in telephony systems or the like
11/14/1990EP0396727A1 Telephone circuits
11/01/1990WO1990013196A1 Device for telecommunication systems
10/1990
10/30/1990US4967195 Hospital signaling and communications system
10/25/1990CA2008035A1 Apparatus for telecommunication
10/24/1990EP0394096A1 Videotex terminal capable of telecopy reception
10/24/1990EP0393059A1 Method for terminating a telephone call by voice command.
10/23/1990US4965833 Voice enhancer system
10/23/1990US4965822 Full duplex speakerphone
10/13/1990CA2014301A1 Videotext terminal usable as a fax copier
10/11/1990DE3910879A1 Door station of a domestic telephone system equipped with voice control
10/03/1990EP0390597A2 Facsimile apparatus
10/03/1990CN2063323U Automatic controller for relaying or dialing
10/03/1990CN1009896B Key telephone system
09/1990
09/25/1990US4959857 Acoustic calibration arrangement for a voice switched speakerphone
09/20/1990DE3908283A1 Control of voice-controlled speech direction identification
09/19/1990EP0388093A2 Interactive facsimile system and method of information retrieval
09/18/1990US4958370 Control system for a plurality of telephone sets
09/18/1990CA1274330A1 Call devices
09/12/1990EP0385986A1 Method of processing calls.
09/11/1990US4956838 Echo cancelling device with frequency sub-band filtering
09/05/1990EP0385767A2 Video phone system
09/05/1990CN1045210A No cord telephone system
09/04/1990US4955055 Loudspeaking telephone with a frequency shifting circuit
08/1990
08/31/1990CA2011136A1 Video phone system
08/28/1990US4953200 Private branch exchange capable of discriminating different types of telephone sets connected thereto
07/1990
07/31/1990US4945570 Method for terminating a telephone call by voice command
07/24/1990US4944002 Current switch for use in telephony systems or the like
07/18/1990CN1044021A Baseband data transmission method and computer local area net in telephone exchange
07/10/1990US4941187 Intercom apparatus for integrating disparate audio sources for use in light aircraft or similar high noise environments
07/04/1990EP0376866A1 Control device for a hands-free half duplex telephone set
07/04/1990EP0376589A2 Self calibration arrangement for a voice switched speakerphone
07/04/1990EP0376588A2 Computer controlled speakerphone for adapting to a communication line
07/04/1990EP0376587A2 Acoustic calibration arrangement for a voice switched speakerphone
07/04/1990EP0376582A2 Computer controlled adaptive speakerphone
07/04/1990EP0376526A2 Telephone agent management information system
06/1990
06/28/1990CA2006190A1 Control device for a hand-free alternate operating telephone set
06/19/1990US4935957 Key telephone system
06/14/1990WO1990006649A1 Telephone circuits
06/13/1990CN1043055A Digital key telephone system
06/06/1990EP0371567A2 Echo canceller
06/05/1990US4932043 Apparatus for controlling key telephone station set in key telephone system
06/05/1990US4932024 System for automatic control of devices, apparata and peripheral units for signal switching and processing
05/1990
05/31/1990DE3839627A1 Telephone terminal
05/29/1990US4930156 Telephone receiver transmitter device
05/16/1990EP0126768B1 A memory cartridge for connection to a telephone switching arrangement
05/15/1990US4926470 Telephone call screening circuit
05/02/1990EP0366584A2 Full-duplex digital speakerphone
05/01/1990US4922526 Automated access facilities for use with key telephone systems
04/1990
04/25/1990EP0364444A1 Internal communication system.
04/18/1990EP0364383A2 Half-duplex speakerphone
04/18/1990EP0364312A1 Integrated circuit for a subscriber set with a signal envelope detector
04/17/1990CA1267962A1 Switching arrangement for communication of digital signals, in particular pcm signals
04/12/1990DE3833745A1 Changeover switching device for a number of extensions to be operated on a common subscriber line
04/04/1990EP0360898A1 Method for taking calls which are signalled by a communication exchange at one or more key telephone terminals
03/1990
03/28/1990CN1007403B Switching arrangement for communication of digital signals, in particular pcm signals
03/27/1990US4912758 Full-duplex digital speakerphone
03/27/1990CA1267208A1 Message signaling arrangement between a switching system and user terminals
03/22/1990DE3832092A1 Digital PBX with a number of communication terminals exhibiting key functions and equipped with line-seizing function keys
03/14/1990CN1007198B Telephone set equipped for amplified listening and with an anti-larsen device
03/13/1990US4908855 Electronic telephone terminal having noise suppression function
03/08/1990DE3829492A1 Device for connecting several telephone sets to one telephone line
03/07/1990CN2054238U Cable loop carrier telephone equipment
03/06/1990US4907259 Call appearance reservation arrangement
03/06/1990US4907258 Key telephone apparatus
02/1990
02/28/1990EP0355488A2 Method for realizing a control procedure in combination with the realisation of a hold state of a line in a calculator-controlled communication system, especially a key telephone system
02/28/1990EP0355487A2 Method for the realization of conference connexions in a computer-controlled communication system, especially a key telephone system
02/28/1990EP0355484A2 Method for realizing a control procedure in combination with the possibility of directly addressing a subscriber in a calculator-controlled communication system, especially a key system
02/28/1990EP0127656B1 A telephone switching arrangement
02/27/1990US4905274 Key telephone management system
02/20/1990US4903247 Digital echo canceller
02/13/1990US4901346 Computer controlled speakerphone for adapting to a communication line
02/13/1990US4901344 Telephone system digital channel bank interface
02/13/1990CA1265860A1 Communications network
02/07/1990CN1006752B Speakerphone sensing circuit
02/06/1990US4899380 Loudspeaking telephone with a variable gain circuit
02/06/1990US4899378 Telephone announcement system
02/06/1990US4899372 Multi use telephone extension control circuit and device providing lockout for privacy
01/1990
01/31/1990EP0352827A2 Intercommunicating telephone set system on bifilar line
01/31/1990EP0352735A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the posibility of breaking-in
01/31/1990EP0352702A2 Method for realizing a control procedure in combination with the direct addressing of a subscriber in a calculator-controlled communication system, especially a key telephone system
01/31/1990EP0352701A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in
01/31/1990EP0352700A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in
01/31/1990CN1006674B Digitally encoded intercommunication telephone system for neighbourhood telephone service
01/30/1990US4897864 Control method and appartus for a radio telephone system
01/09/1990US4893334 Intercommunication system for telephones
01/09/1990US4893333 Interactive facsimile system and method of information retrieval
01/09/1990US4893310 Digital key telephone system
01/02/1990US4891837 Voice control circuit for a communication terminal
12/1989
12/12/1989US4887293 Trunk circuit with loop length gain equalization
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