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)
12/1980
12/02/1980CA1090885A1 Multi-channel radio relay systems
11/1980
11/25/1980CA1090492A1 Ssb-fdm communication system derived from a complex band-pass digital filter bank
11/18/1980US4234950 Telephone station carrier system
10/1980
10/28/1980US4230910 Signalling and channel loop test circuits for station carrier telephone system
09/1980
09/30/1980US4225969 Method and apparatus for testing a frequency synthesizer in an RF modem
09/23/1980US4224476 Multiparty subscriber loop carrier systems
09/09/1980US4221934 Compandor for group of FDM signals
08/1980
08/20/1980EP0014244A1 Method and device for testing a frequency synthesizer in a HF modem
08/12/1980US4217554 Circuits for reducing intermodulation noise
08/07/1980WO1980001633A1 Modified vestigial side band transmission system
07/1980
07/22/1980US4214129 Sideband cancellation circuit for a transmission line communications system receiver
07/15/1980US4213015 Failure alarm for a transmission line communications system
07/01/1980US4210779 Amplitude modulated telephone carrier system and terminal equipment therefor
06/1980
06/24/1980US4209748 Directional radio system for single sideband operation
06/24/1980US4209664 Carrier frequency sound transmission system
06/17/1980US4208547 Method and apparatus for reducing noise in stereophonic signals
06/17/1980CA1079810A1 Signal processor for reducing interference between frequency-modulated signals
06/10/1980US4207521 System using carrier burst sequences for detecting interference signals occurring across channels of a radio link including a repeater
05/1980
05/28/1980EP0011164A1 Digital frequency divider circuit
05/27/1980CA1078534A1 Contiguous channel multiplexer
05/20/1980US4204165 Multichannel coherent receiver
04/1980
04/29/1980CA1076724A1 High voltage low frequency signal transmitter using a carrier current link
04/22/1980US4199660 FDM/TDM Transmultiplexer
04/17/1980WO1980000771A1 A signaling and ranging technique for a tdma satellite communication system
04/16/1980EP0009534A1 Wavelength division system with reduced cross-talking between each of the channels
04/15/1980CA1075837A1 Arrangement for processing auxiliary signals in a frequency multiplex transmission system
04/08/1980US4197433 Device for conveying a high-voltage low-frequency signal over a carrier connection
04/02/1980EP0009203A1 Method and circuit for digital audio/FDM or PCM/FDM transposition and vice versa
02/1980
02/12/1980CA1071779A1 Multi-channel multiplex data transmission system
01/1980
01/22/1980US4185248 Input level supervisory system for level regulator
12/1979
12/11/1979US4178482 Automatic gain control circuit and system for using same
10/1979
10/02/1979CA1063742A1 Telephone ringing control circuits
09/1979
09/19/1979EP0004042A1 Circuit arrangement for generating carrier frequencies
08/1979
08/28/1979CA1061482A1 Channel switching unit for a telephone switching centre and switching arrangement utilising such units
08/28/1979CA1061481A1 Channel board for telephony transmission equipment using single side band multiplexing
08/21/1979CA1061023A1 Telephone artery with multiple access points and telephone networks with such arteries
07/1979
07/17/1979US4161694 Radio relay channel branch cascade exhibiting uniform transit-time-and-attenuation-characteristics of all channels
05/1979
05/29/1979CA1055573A1 Carrier signal generator
05/17/1979WO1979000271A1 Fdm/tdm transmultiplexer
05/01/1979US4152546 Ringer power generator circuit for carrier subscriber station terminal
04/1979
04/10/1979US4149142 Signal transmission system with an error control technique
03/1979
03/20/1979US4145575 Frequency-division multiplexed signal transmission system
12/1978
12/26/1978US4131766 Digital filter bank
12/26/1978US4131764 Arrangement for converting discrete signals into a discrete single-sideband frequency division-multiplex-signal and vice versa
12/19/1978US4130811 Modulation system
12/19/1978US4130733 Frequency channel units for a FDM system
11/1978
11/28/1978US4127746 Method and apparatus employing a pulsed carrier in generating single sideband signals for FDM transmission
10/1978
10/10/1978US4119802 Digital linear interface system
10/10/1978CA1040329A1 Telephone system comprising a satellite
09/1978
09/12/1978CA1038512A1 Measurement of noise in a communications channel
08/1978
08/15/1978US4107471 Frequency division multiplex communications system
08/15/1978US4107470 Digital SSB-FDM communication system derived from a complex band-pass digital filter bank and by a filter breakdown process
08/08/1978US4105981 Synchronous demodulation device
07/1978
07/18/1978US4101738 Arrangement for processing auxiliary signals in a frequency multiplex transmission system
07/04/1978US4099123 Electrical multi-channel signal transmission systems
05/1978
05/02/1978US4087639 Amplitude modulated telephone carrier systems
03/1978
03/07/1978US4078245 System for multiplexing information channels adjacent to a video spectrum
02/1978
02/28/1978US4077006 Bidirectional unicable switching system
02/21/1978US4075429 Transmultiplexer
02/14/1978US4074198 System for suppressing sideband components of angle-modulated wave
01/1978
01/03/1978US4066966 Alarm system utilizing a bidirectional transmission line in CATV system
10/1977
10/11/1977US4053713 Multi-channel multiplex data transmission system
09/1977
09/27/1977US4051533 Signal processor for reducing interference between frequency-modulated signals
08/1977
08/02/1977US4039751 Method and apparatus for closed loop testing of first and second modulators and demodulators
06/1977
06/28/1977US4032716 Measurement of noise in a communication channel
06/21/1977US4031327 Telephone set and system utilizing frequency division multiplexing
06/21/1977US4031326 Telephone artery with multiple access points and telephone networks with such arteries
06/14/1977US4029902 Contiguous channel multiplexer
05/1977
05/24/1977US4025730 In-band signal receiver
05/24/1977US4025729 Telephone ringing control circuits
05/17/1977US4024350 Channel switching unit for a telephone switching center and switching arrangements utilizing such units
04/1977
04/26/1977US4020289 Random access, multiple station communication system
04/26/1977US4020288 System for data transmission through the channels of a frequency division multiplex system
04/19/1977US4018993 Telephone system comprising a satellite
03/1977
03/22/1977US4013842 Method and apparatus for interfacing digital and analog carrier systems
01/1977
01/11/1977US4003003 Multichannel digital synthesizer and modulator
01/11/1977US4002980 Relay station in a telecommunications transmission system
01/04/1977US4001511 Channel board for telephony transmission equipment using single side band multiplexing
01/04/1977US4001510 Digital modulator and demodulator system for fdm telephony
11/1976
11/16/1976US3992589 Frequency multiplex system for transmission of telephone and videophone channels
11/09/1976US3991277 Frequency division multiplex system using comb filters
10/1976
10/12/1976US3985968 Multiplex data communications using acoustical surface wave filters
07/1976
07/27/1976US3971922 Circuit arrangement for digitally processing a given number of channel signals
07/20/1976US3970795 Measurement of noise in a communication channel
07/13/1976US3969585 Frequency-division multiplexer for telephone transmission providing for transposition of conversation and calling channels into a primary frequency group
06/1976
06/22/1976US3965300 200 MHz carrier frequency system with sextenary groups
06/15/1976USRE28867 Moving object communication control system
04/1976
04/20/1976US3952163 Method and apparatus for testing in FDM system
04/13/1976US3950699 Device for measuring a signal having a very high noise level
03/1976
03/23/1976US3946250 Carrier frequency selector
03/02/1976US3942115 Dual pilot redundant AFC system for satellite communications system
02/1976
02/24/1976US3940752 Transducing system
01/1976
01/27/1976US3935566 Multiple-channel information translation system and method
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