Patents
Sitemap › H04 - Electric communication technique › H04J - Multiplex communication › H04J 1 - Frequency-division multiplex systems
Patents for H04J 1 - Frequency-division multiplex systems (15,293)
10/1987
10/14/1987EP0240634A2 Modular contiguous channel multiplexer
10/07/1987EP0239614A1 Compressive receiver having pulse width expansion
09/1987
09/16/1987EP0236759A2 Radio communications system with reduced interference
09/16/1987EP0236445A1 Capacity expander for telephone line
09/01/1987CA1226347A1 Selective fading protection system
07/1987
07/28/1987US4683565 Phase controlled frequency division multiplexed communications system
07/28/1987US4683445 Synchronization method for deriving a reference signal from a pilot frequency
07/27/1987EP0165242A4 Fiber optic digital data transmitting system.
07/07/1987US4679227 Ensemble modem structure for imperfect transmission media
07/07/1987CA1223984A2 Polarization-insensitive optical multiplexing apparatus
06/1987
06/30/1987US4677618 Method and apparatus for deskewing WDM data transmitted through a dispersive medium
06/16/1987US4674031 Peripheral power sequencer based on peripheral susceptibility to AC transients
06/09/1987US4672605 Data and voice communications system
06/02/1987US4670874 Communications system for transmitting and receiving data and voice signals simultaneously through 2-wire signal lines
05/1987
05/19/1987CA1222077A1 Communications system for transmitting and receiving data and voice signals simultaneously through 2-wire signal lines
05/12/1987US4665516 Information transport system employing telephone lines
04/1987
04/14/1987US4658395 Method for locating faults in a carrier subscriber communication system
04/09/1987WO1987002141A1 Compressive receiver having pulse width expansion
03/1987
03/24/1987CA1219639A1 Apparatus and method for reducing telephone channel power loading
03/18/1987EP0214649A2 FDM-TDM transmultiplexing system
03/18/1987CN85106503A Single channel carrier wave communication system with transmiting power controller driven by voice
03/12/1987WO1987001542A1 Capacity expander for telephone line
02/1987
02/17/1987CA1218113A1 Microwave communications system
02/04/1987EP0210688A2 Signal transmission system and a transmitter and a receiver for use in the system
01/1987
01/31/1987CN85102164A Series resonance constant-current electric charging machine with overdamping
01/17/1987CN85101923A Frequency synthesising type multichannel radio apparatus
01/10/1987CN85101153A Alternating communication channel switchover system
12/1986
12/16/1986US4630285 Method for reducing group delay distortion
12/16/1986CA1215482A1 Simultaneous transmission of speech and data over an analog channel
12/09/1986CA1215127A1 Receiver for multicarrier signals protected from unwanted signals
12/09/1986CA1215119A1 Fiber optic digital data transmitting system
12/04/1986WO1986007223A1 Ensemble modem structure for imperfect transmission media
12/03/1986EP0203614A2 Inter-network connection system
12/03/1986EP0203500A2 Method and arrangement for transmitting and extracting a timing signal
12/03/1986CN86103604A Inter-network connection system
11/1986
11/26/1986CN86103406A Ensemble modem structure for imperfect transmission media
11/25/1986US4625305 Multiplexing of optical signals
10/1986
10/28/1986CA1213382A1 Optical fdm system
10/15/1986EP0197263A2 Method and apparatus for deskewing WDM data transmitted through a dispersive medium
10/07/1986CA1212443A1 System and method for controlling a multiple access data communications system including both data packets and voice packets being communicated over a cable television system
09/1986
09/23/1986US4613975 Selective fading protection system
08/1986
08/19/1986CA1210072A1 Direct modulation fm data receiver
07/1986
07/29/1986CA1208735A1 Timed token ring with multiple priorities
07/23/1986EP0187969A1 Circuit for generating system carrier signals, line pilot frequencies, channel carrier and control frequencies in a telephone equipment with multichannel overhead lines
07/15/1986US4601027 Optical FDM system
07/15/1986US4600875 Power supplies with latch-up prevention and automatic back-up
07/03/1986WO1986003909A1 Circuit for producing channel carrier frequencies, auxiliary pilot frequencies, system carrier frequencies and system carrier-control frequencies for multichannel carrier current telephone installations with premodulation system
07/03/1986WO1986003908A1 Circuit arrangement for producing system carrier signals, linear pilot frequencies and channel-carrier control frequencies of multi-channel overhead telecommunications lines
07/02/1986EP0186068A1 Circuit arrangement for the production of channel carrier frequencies, pilot auxiliary frequencies, system carrier frequencies and control frequencies for a carrier system in a multichannel carrier current telephone system with pre-modulation
07/02/1986CA1207030A Communication set and method
06/1986
06/11/1986CN85201877U Multichannel carrier with integrated circuit phase-shift modulation
05/1986
05/22/1986WO1986003081A1 Two-hop collocated satellite communications system
04/1986
04/29/1986US4586174 Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls
04/08/1986CA1203030A1 Simultaneous transmission of speech and data over an analog channel
04/02/1986EP0176273A2 Information transport system employing telephone lines
03/1986
03/26/1986EP0174989A1 Data and voice communications system
03/25/1986US4578790 System and equipment for single side band multiplexing through digital processing
02/1986
02/19/1986EP0171924A2 Radio frequency multiplexing filter using fibre optic delays
01/1986
01/28/1986US4567586 Service integrated digital transmission system
12/1985
12/27/1985EP0165242A1 Fiber optic digital data transmitting system.
12/20/1985CN85102233A Carrier telephone plants for subscriber's high frequency loop circuif
12/04/1985EP0163322A2 SCPC communication system including a voice-activated transmission power controller
12/03/1985US4556973 Frequency-division multiplex communication method and system
10/1985
10/08/1985CA1194972A1 Acousto-optical channelized processor
10/01/1985US4545048 Service integrated digital transmission system
09/1985
09/26/1985WO1985004298A1 Data and voice communications system
09/25/1985EP0155285A1 Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls.
08/1985
08/20/1985US4536871 Signal detector apparatus
08/20/1985EP0097180A4 A distributed control communications system.
08/06/1985US4534024 System and method for controlling a multiple access data communications system including both data packets and voice packets being communicated over a cable television system
07/1985
07/23/1985US4531208 Apparatus and method for reducing telephone channel power loading
07/09/1985USRE31943 Multichannel coherent receiver
07/03/1985EP0146894A2 Communications system for transmitting and receiving data and voice signals simultaneously through 2-wire signal lines
06/1985
06/25/1985US4525844 Method for interchanging n partial bands
06/25/1985US4525834 Service integrated digital transmission system
06/20/1985WO1985002733A1 Fiber optic digital data transmitting system
06/11/1985US4523324 Direct modulation FM data receiver
06/11/1985US4523311 Simultaneous transmission of speech and data over an analog channel
06/04/1985CA1188383A1 Method for interchanging n partial bands
05/1985
05/02/1985EP0139405A2 Data transmission system
05/02/1985EP0138988A1 Simultaneous transmission of speech and data over an analog channel.
05/02/1985EP0138975A1 Simultaneous transmission of speech and data over an analog channel
04/1985
04/16/1985US4512013 Simultaneous transmission of speech and data over an analog channel
04/09/1985US4510598 Digital transmultiplexer
04/02/1985US4509206 Receiver for multicarrier signals protected from unwanted signals
04/02/1985CA1185025A1 Data under voice communications system
03/1985
03/26/1985CA1184608A1 Method for transposing the frequency of sub-bands
03/19/1985US4506356 Service integrated digital transmission system operating in time multiplex
02/1985
02/28/1985WO1985000944A1 Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls
02/19/1985US4500984 Equalizer for reducing crosstalk between two FDM/FM carriers in a satellite communications system
01/1985
01/29/1985CA1181876A1 Method and apparatus for efficient statistical multiplexing of voice and data signals
01/29/1985CA1181816A1 In-band signalling system for fm transmission systems
01/23/1985EP0131818A2 Optical FDM system
01/02/1985CA1180390A High power multiplexer for dual polarized frequency reuse earth stations
12/1984
12/18/1984US4489411 Process and a circuit arrangement for signal transmission using an amplitude-modulated radio broadcasting system
11/1984
11/06/1984US4481621 Service integrated digital signal transmission system
10/1984
10/25/1984WO1984004217A1 Simultaneous transmission of speech and data over an analog channel
10/25/1984WO1984004216A1 Simultaneous transmission of speech and data over an analog channel
10/02/1984US4475242 Microwave communications system
09/1984
09/26/1984EP0119290A1 Three-stage single-side band premodulated frequency carrier system
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