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)
08/1990
08/08/1990EP0380945A2 Optical broad-band communication transmission system, especially in the subscriber access area
07/1990
07/11/1990EP0377509A2 Efficient digital frequency division multiplexed signal receiver
07/03/1990CA1271236A1 Multi-stage transmitter aerial coupling device
06/1990
06/26/1990US4937821 Pipeline information delivery system
06/19/1990US4935924 Signal distribution network
06/19/1990US4934983 Data communication system having level control means
05/1990
05/29/1990US4930120 Signal distribution network system
05/22/1990CA1269462A1 Two-hop collocated satellite communications system
05/16/1990CN1008041B Alternating communication channel switchover system
05/15/1990CA1269159A1 Switching techniques for fdm communication systems
05/09/1990EP0367546A2 Microwave subcarrier generation for fiber optic systems
05/01/1990US4922528 Circuitry for recognizing two-tone compound signals in telephone installations
05/01/1990CA2001511A1 Microwave subcarrier generation for fiber optic systems
04/1990
04/25/1990EP0165242B1 Fiber optic digital data transmitting system
03/1990
03/28/1990CN1007397B Frequency synthesizer of radio broadcast telephone system with multi-allotable frequency channels
03/21/1990EP0359205A2 Optical communication system for simultaneous transmission of a baseband digital signal and multiple microwave subcarriers
03/21/1990EP0358688A1 Method for dynamically allocating data channels on a trunked communication system.
03/14/1990CN1040467A Multiple use of fm band
03/08/1990WO1990002445A1 Multiple use of an fm band
03/07/1990CN1040295A Technique for reducing distortion characteristics in fiber-optic links
02/1990
02/28/1990EP0356096A2 Multiple reuse of an FM band
02/27/1990US4905218 Optical multiplex communication system
02/07/1990EP0353835A2 Technique for reducing distortion characteristics in fiber-optic links
01/1990
01/30/1990CA1265201A1 Radio communications system with reduced d/u ratio variations
01/23/1990US4896320 Filter bank for frequency demultiplexing in multiple channels
01/16/1990US4894825 Frequency-division multiplex broadband multimedia network
01/10/1990CN1006436B Inter-network connection system
01/09/1990US4893300 Technique for reducing distortion characteristics in fiber-optic links
12/1989
12/20/1989EP0346868A2 Time shared power amplifier
12/13/1989EP0345496A2 Microwave multiplexer
12/05/1989US4885747 Broadband and baseband LAN
11/1989
11/28/1989US4884265 Digital demodulator for frequency-division-multiplexed signals
11/28/1989US4884139 Method of digital sound broadcasting in television channels with spectrum interlacing
11/16/1989WO1989011186A1 Intercom telephone
11/14/1989US4881245 Improved signalling method and apparatus
11/14/1989US4881222 Multicarrier demodulator
11/14/1989CA1262973A1 Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls
10/1989
10/18/1989EP0337671A2 Signal transmission system for machine tools, inspection machines, and the like
09/1989
09/26/1989US4870642 Demand-assignment communication system
09/26/1989US4870408 Method for dynamically allocating data channels on a trunked communication system
09/26/1989CA1260164A1 Multiplex transmission of analog signals by fiber optic channel
09/19/1989US4868810 Multi-stage transmitter aerial coupling device
08/1989
08/30/1989EP0329912A2 Communication system for transmission of broadband and baseband information
08/02/1989EP0326205A2 Channel allocation controller and signal distribution network
07/1989
07/26/1989EP0325331A2 Signal distribution network system
07/19/1989EP0324363A2 Demand assignment multiple access control system
07/11/1989CA1257337A1 Frequency synthesizer for broadcast telephone system having multiple assignable frequency channels
06/1989
06/28/1989CN1004674B Series resonance constant-current electric charging machine with overdamping
06/27/1989CA1256616A1 Capacity expander for telephone line
06/13/1989US4839894 Contiguous channel multiplexer/demultiplexer
06/01/1989WO1989005071A1 Apparatus and method for converting a frequency division multiplex to a time division multiplex
05/1989
05/31/1989EP0318334A1 Apparatus and method for converting a frequency division multiplex to a time division multiplex
05/02/1989US4827515 Digital demodulator
04/1989
04/18/1989CA1252923A1 Fdm-tdm transmultiplexing system
04/11/1989CA1252514A2 Compatible am broadcast/data transmission system
03/1989
03/29/1989EP0308520A1 Digital-Demodulator
03/21/1989US4815075 Modular contiguous channel multiplexer
03/21/1989CA1251586A1 Ensemble modem structure for imperfect transmission media
02/1989
02/07/1989US4803738 Radio communications system with reduced D/U ratio variations
01/1989
01/24/1989US4800555 Technique for repelling carriers in optical communications to minimize mutual interference
01/17/1989US4799213 Data transmission system
12/1988
12/28/1988EP0296175A1 Method and installation for digital communication, particularly between and toward moving vehicles.
12/06/1988US4789980 Switching techniques for FDM communication systems
11/1988
11/17/1988EP0290790A2 Filter bank
11/15/1988US4785447 FDM demultiplexer using oversampled digital filters
11/15/1988US4785260 Frequency synthesizer for broadcast telephone system having multiple assignable frequency channels
11/08/1988US4783779 Frequency assignment system in FDMA communication system
11/03/1988WO1988008648A1 Method for dynamically allocating data channels on a trunked communication system
11/02/1988EP0289401A2 Digital demodulator for frenquency-division-multiplexed signals
10/1988
10/05/1988EP0284734A2 Circuit for the recognition of dual tone multifrequency signals in telephone exchanges
09/1988
09/21/1988CN88101159A Technique for repelling carriers in optical communication to minimize mutual interference
09/14/1988EP0281738A2 Multicarrier demodulation method
09/13/1988CA1242038A1 Scpc communication system including a voice-activated transmission power controller
09/07/1988EP0281306A2 A technique for repelling carriers in optical communications to minimize mutual interference
08/1988
08/31/1988EP0280161A2 FDM demultiplexer using oversampled digital filters
08/30/1988US4768187 In a radio communication system
08/30/1988US4768186 Multiplex transmission of analog signals by fiber optic channel
08/17/1988EP0278192A1 Method for digitally broadcasting in television channels
07/1988
07/19/1988US4759013 FDM-TDM transmultiplexing system
07/05/1988US4755994 Capacity expander for telephone line
06/1988
06/21/1988US4752925 Two-hop collocated satellite communications system
05/1988
05/31/1988US4748616 Method and arrangement for transmitting and extracting a timing signal
05/31/1988CA1237545A1 Data and voice communications system
05/18/1988CN87105897A Multi-stage transmitter aerial coupling device
05/10/1988EP0155285A4 Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls.
04/1988
04/11/1988EP0138988A4 Simultaneous transmission of speech and data over an analog channel.
04/05/1988CA1234932A1 Method and apparatus for deskewing wdm data transmitted through a dispersive medium
03/1988
03/30/1988EP0261600A2 Data communication system having level control means
03/30/1988EP0138975A4 Simultaneous transmission of speech and data over an analog channel.
03/15/1988US4731816 Ensemble modem structure for imperfect transmission media
03/02/1988EP0257901A2 Switching techniques for FDM communication systems
02/1988
02/25/1988WO1988000417A3 Method and installation for digital communication, particularly between and toward moving vehicles
02/17/1988EP0255972A2 Multi-stage transmitter-antenna coupling device
02/10/1988CN86101535A Multifrequency sequence-combination coding method
01/1988
01/14/1988WO1988000417A2 Method and installation for digital communication, particularly between and toward moving vehicles
12/1987
12/22/1987US4715029 FDMA communications channel synchronizer
12/08/1987CA1230162A1 Data transmission system
11/1987
11/18/1987CN87101989A Frequency synthesizer of radio broadcast telephone system with multi-allotable frequency channels
11/10/1987US4706243 Single-channel-per-carrier communication system including a voice-activated transmission power controller
11/03/1987US4704737 Compressive receiver having pulse width expansion
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