| Patents for H04Q 1 - Details of selecting apparatus or arrangements (11,745) |
|---|
| 06/03/1980 | CA1078980A1 Circuit arrangement for a digital multifrequency-signal receiver |
| 05/27/1980 | US4205203 Methods and apparatus for digitally signaling sounds and tones in a PCM multiplex system |
| 05/20/1980 | US4204095 Telephone main distributing frame |
| 05/20/1980 | US4204094 Tone applying line circuit |
| 05/14/1980 | EP0011018A1 Recognition apparatus and method for a digital multi-frequency signal receiver |
| 05/14/1980 | EP0010922A1 Device for determining periodic components of an alternating signal |
| 05/14/1980 | EP0010783A1 Method and device for detecting the presence of one or more MFC-frequencies within a PCM-signal |
| 05/14/1980 | EP0010720A1 Fully electronic loop closure circuit |
| 05/13/1980 | US4203008 Digital signalling receiver for receiving PCM tones |
| 05/06/1980 | US4202029 Transportable telephone exchange apparatus |
| 05/06/1980 | CA1077162A1 Mounting device for electrical connectors |
| 05/01/1980 | WO1980000905A1 Minimum break/make pulse corrector |
| 04/30/1980 | EP0010344A1 Digital signal detector |
| 04/29/1980 | CA1076649A1 Interface for in band scpc supervisory and signalling system |
| 04/22/1980 | US4199729 Variable peak detector |
| 04/15/1980 | US4198547 Pulse circuit for two wire electronic PABX stations |
| 04/08/1980 | US4197502 Digital signal detector |
| 04/08/1980 | US4197434 Telephone exchange apparatus |
| 04/02/1980 | EP0009124A1 Arrangement for subscriber circuits of digital time multiplex telecommunication systems, in particular of local PCM telephone exchanges |
| 04/01/1980 | US4196321 Loopback test system |
| 03/18/1980 | US4194092 Device for detecting a frequency in a PCM coded signal |
| 03/04/1980 | US4191862 Dual frequency tone decoder |
| 02/26/1980 | CA1072695A1 Telephone tone signalling receiver |
| 02/26/1980 | CA1072671A1 Electrical connector block |
| 02/26/1980 | CA1072670A1 Cross-connection assembly for communications wires |
| 02/26/1980 | CA1072659A1 Electronic trunk scanner |
| 02/20/1980 | EP0008220A1 Dual frequency tone decoder system interface |
| 02/20/1980 | EP0008160A1 Programmable digital tone detector |
| 02/05/1980 | US4187414 Circuit arrangement for an interference data alarm system in communication facilities, particularly in telephone equipment |
| 02/05/1980 | US4187403 Voice-protected, frequency-selective signal receiver |
| 01/29/1980 | CA1070840A1 Cross-correlation arrangement |
| 01/23/1980 | EP0007122A1 Forced-air cooling of an electronic assembly |
| 01/22/1980 | US4185172 Method of and means for detecting digitized multi frequency-coded signals |
| 01/22/1980 | CA1070430A1 Method and apparatus for generating digital dual frequency signals |
| 01/15/1980 | US4184053 Ringing signal detector |
| 01/08/1980 | CA1069599A1 Distributing device for a multiconductor cable |
| 12/18/1979 | US4179170 Connector assembly for telephone distribution equipment |
| 12/11/1979 | CA1068021A1 Digital testing and power control in a digital communication system |
| 12/04/1979 | US4177359 Post wire guide latching means |
| 11/27/1979 | US4176286 Signal translator with squelch |
| 11/27/1979 | US4176257 Telephone connector block |
| 11/13/1979 | US4174466 Multi-party telephone system allowing speech connection between extensions as between extensions and an outer line |
| 10/30/1979 | CA1065417A1 Sampled signal detector |
| 10/23/1979 | CA1065041A1 Mounting apparatus for a telephone exchange unit |
| 10/16/1979 | US4171466 Digital wave generator for composite tone |
| 10/16/1979 | CA1064633A1 Receiver apparatus for detection of two voice frequencies in a multifrequency tone signal |
| 10/04/1979 | WO1979000728A1 Signal translator with squelch |
| 10/02/1979 | US4169969 Apparatus for detecting in-band signalling signals |
| 09/25/1979 | US4169221 Method and apparatus for testing a subscriber line group marker of a telephone central office cross bar switching device |
| 09/25/1979 | CA1063272A1 Multifrequency signal parity detector |
| 09/18/1979 | US4168515 Line protector for a communications circuit |
| 09/18/1979 | US4168402 Electronic trunk selector |
| 08/28/1979 | CA1061490A1 Dial impulse relay circuit |
| 08/28/1979 | CA1061440A1 Call processing restoration arrangement for telephone switching system |
| 08/21/1979 | US4165450 Telephone signalling test system |
| 07/24/1979 | CA1059246A1 Holding circuit in a receiver for detecting two frequencies in a multifrequency tone signal |
| 07/24/1979 | CA1059231A1 Modular distribution frame assembly |
| 07/17/1979 | US4161630 Circuit arrangement for use in telephone systems |
| 07/17/1979 | CA1058784A1 Digital decoder for multiple frequency telephone signalling |
| 07/10/1979 | US4160880 Modular termination system for communication lines |
| 07/10/1979 | CA1058313A1 Telephone distribution frame connector assembly |
| 06/19/1979 | US4158754 Mounting apparatus for communication exchange equipment |
| 06/12/1979 | CA1056525A1 Pay telephone applique for subscriber carrier telephone system |
| 06/12/1979 | CA1056505A1 Receiver for voice response system |
| 05/08/1979 | US4153847 Logic circuits |
| 05/08/1979 | US4153819 Telephone tone signalling receiver with up-conversion of frequency of tones controlled by word instructions |
| 05/01/1979 | US4152749 Matrix terminal block |
| 05/01/1979 | CA1053821A1 Receiver/sender for signalling between telephone switching facilities |
| 04/24/1979 | US4151472 Selective calling circuit employing controlled power supply therefor |
| 04/24/1979 | US4150867 Pre-wired terminal connecting block |
| 04/24/1979 | CA1053389A1 Mfc receiver digital signal processing |
| 03/27/1979 | US4146755 Protecting for low voltage lines, in particular for telephone networks |
| 03/27/1979 | US4146751 Solid state pulsing apparatus for pulsing selected line relay terminals |
| 03/20/1979 | US4145580 Multi-frequency signal receiver |
| 03/20/1979 | US4145576 DTMF and rotary dial signal receiver |
| 02/27/1979 | US4142177 Digital tone decoder system |
| 02/22/1979 | WO1979000066A1 Multifrequency signal receiver |
| 02/20/1979 | US4140885 Modular interchange termination system |
| 02/20/1979 | US4140880 Hold tone scanner |
| 02/13/1979 | CA1048628A1 interface and control system for telecommunication center |
| 02/06/1979 | US4138599 Modular communication system having self-identifying modules |
| 02/06/1979 | CA1048184A1 Pulse duration correction circuit |
| 01/30/1979 | CA1047611A1 Digital tone detector using concatenated detection intervals |
| 01/23/1979 | US4136356 Wiring substrate for a matrix circuit |
| 01/16/1979 | US4135062 Electric network for use in a subscriber's loop |
| 01/09/1979 | US4133982 AC supervisory signal detector circuit |
| 01/09/1979 | US4133979 Multifrequency sender/receiver in a multi-time slot digital data stream |
| 12/26/1978 | US4131934 Receptacle fixture for equipment units in electrical communication technology |
| 12/26/1978 | US4131330 Mounting device for electrical connectors |
| 12/19/1978 | US4130736 Telecommunication system with keyboard selection |
| 12/12/1978 | US4129756 Telephone exchange signalling unit |
| 11/28/1978 | US4127748 Cable transfer panel |
| 11/21/1978 | CA1043024A1 Multi-frequency signaling decoder |
| 11/07/1978 | US4124898 Programmable clock |
| 11/07/1978 | CA1042108A1 Tone detector using spectrum parameter estimation |
| 10/31/1978 | CA1041671A1 Serial digital bit stream code detector |
| 10/24/1978 | US4122313 Telephone connector cutover block |
| 10/17/1978 | CA1040732A1 Thyristor circuitry for providing automatic number identification services |
| 10/10/1978 | US4119808 Multi-frequency receiver circuits |
| 10/03/1978 | US4118091 Electrical connection assemblies |