Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 1 - Arrangements for detecting or preventing errors in the information received
Patents for H04L 1 - Arrangements for detecting or preventing errors in the information received (103,402)
11/1985
11/19/1985US4554508 Carrier detection circuit
11/19/1985CA1196982A1 Request-to-send (rts)/data carrier detect (dcd) simulator
11/19/1985CA1196976A1 Loop transmission system and method of controlling the loop-back condition thereof
11/13/1985EP0160993A2 Radio-system
11/13/1985EP0160748A1 Error code insertion for alphabet code converters
11/12/1985US4553237 Error-correction system for two-dimensional multilevel signals
11/05/1985US4551845 System for phasing digital trains and application thereof to the switching of said trains
11/05/1985US4551842 Error-protected data transmission device and communication network
11/05/1985US4551839 Error-protecting system for a two-way asynchronous data transmission
11/05/1985US4551830 Apparatus for providing loopback of signals where the signals being looped back have an overhead data format which is incompatible with a high speed intermediate carrier overhead format
10/1985
10/30/1985EP0159650A1 Evaluation device for received signals in an audio frequency ripple control receiver
10/22/1985US4549297 Data retransmitting system
10/22/1985US4549049 Arrangement for testing a device provided with an echo canceller
10/16/1985EP0158515A2 Diversity system of selection type equipped with a code correction/switch circuit for receiving a psk or qam wave carrying differentially encoded signal
10/16/1985EP0158327A2 Space diversity communications system for multi-direction time division multiplex communications
10/14/1985EP0076846A4 Data processing system having error checking capability.
10/09/1985EP0157413A2 Digital communication system including an error correcting encoder/decoder and a scrambler/descrambler
10/09/1985EP0157412A2 Radio communication system
10/08/1985CA1194955A1 Digital signal communication system
10/08/1985CA1194954A1 Data transmission system
10/02/1985EP0156388A2 Technically signal-secure data processing arrangement
10/02/1985EP0156315A2 Circuit for testing the correct operation of a data transmission system
10/01/1985US4545055 Error analyzer for data communicated by bus protocol
10/01/1985CA1194561A1 Adaptive threshold apparatus
09/1985
09/26/1985WO1985004298A1 Data and voice communications system
09/25/1985EP0155882A1 Method and device for error protection suitable for the digital transmission of data frames
09/24/1985US4543611 Method and an apparatus for image processing
09/24/1985CA1194171A1 Error-protected data transmission device and communication network
09/24/1985CA1194168A1 System for communication by way of repeatedly transmitted messages, and stations for use in such a system
09/18/1985EP0155058A2 A method of, and a circuit for, estimating true data from distorted digital data signals
09/17/1985US4542514 Method of measuring quality of a signal received by a receiver of a two-dimensional linear modulation data communication system
09/17/1985US4542498 High bit-rate coupler between a PCM channel multiplex and a packet switching unit
09/17/1985US4542496 Loop transmission system and method of controlling the loop-back condition thereof
09/17/1985CA1193667A1 Method of and system for safeguarded transmission of digital signals
09/11/1985EP0154565A2 Modem
09/10/1985US4541095 System for communication by way of repeatedly transmitted messages, and stations for use in such a system
08/1985
08/29/1985WO1985003825A1 Alternating communication channel switchover system
08/28/1985EP0152854A1 Method and arrangement for detecting errors in a CMI-coded binary information flow
08/28/1985EP0152423A1 Maintenance response signalling arrangement for a digital transmission system.
08/21/1985EP0151616A1 Control signalling arrangement for a digital transmission system.
08/14/1985EP0151430A2 Detector
08/13/1985US4535421 Universal real time transparent asynchronous serial/echoplex converter
08/06/1985US4534043 Test tone detector apparatus and method modem using same
08/06/1985US4534025 Vehicle multiplex system having protocol/format for secure communication transactions
07/1985
07/18/1985WO1985003180A1 Packetized ensemble modem
07/17/1985EP0148258A1 Signal quality steered diversity
07/16/1985US4530095 Comparison of digital bit streams using modified parity
07/16/1985US4530087 Space diversity receiving system for multi-direction time division multiplex communication
07/16/1985US4530085 Reconfiguration control method for a loop-type data network
07/16/1985US4529979 Remote return loop control in a data transmission system
07/16/1985CA1190653A1 Digital waveform conditioning circuit
07/16/1985CA1190610A1 Energy synchronized demodulator circuit
07/04/1985WO1985002924A1 Method for improving message reception from multiple sources
07/03/1985EP0146632A1 Majority circuit
07/02/1985US4527267 Method of administering local and end-to-end acknowledgments in a packet communication system
06/1985
06/26/1985EP0070287B1 High frequency communications
06/19/1985EP0145318A2 Communications method
06/19/1985EP0145101A2 Carrier detection circuit
06/19/1985EP0144979A2 Method of measuring the bit error rate of binary digital signals
06/19/1985EP0144839A2 Squelch signal generator capable of generating a squelch signal with a high reliability
06/18/1985US4524244 Digital and voice telecommunication apparatus
06/11/1985US4523323 Digital signal communication system for multi-level modulation including unique encoder and decoder
06/05/1985EP0143224A2 Method of recognizing the failure of one or more transmission channels in a redundant optical transmission system
06/04/1985CA1188386A1 System for transmitting digital information signals
06/04/1985CA1188385A1 Method and apparatus for selectively compensating burst errors of variable length in successive digital data words
05/1985
05/28/1985US4520490 Differentially nonlinear convolutional channel coding with expanded set of signalling alphabets
05/28/1985US4520483 Signal diagnostic method and apparatus for multiple transmission system
05/28/1985CA1187999A1 Pcm signal processor
05/28/1985CA1187958A1 Multiple source clock encoded communications error detection circuit
05/28/1985CA1187957A1 Vital communication system for transmitting multiple messages
05/22/1985EP0141911A2 Telecommunications apparatus
05/15/1985EP0141659A2 Communication interface
05/14/1985US4517669 Method and apparatus for coding messages communicated between a primary station and remote stations of a data communications system
05/09/1985WO1985002041A1 Communication interface
05/08/1985EP0140456A1 Data processing system in which unreliable words in the memory are replaced by an unreliability indicator
05/08/1985EP0140381A2 Decoding method and system for doubly-encoded reed-solomon codes
05/08/1985EP0139803A1 Method of recovering lost information in a digital speech transmission system, and transmission system using said method
05/07/1985CA1186753A1 Activity detector usable with a serial data link
05/02/1985EP0138981A1 Improved error protection of linearly coded digital signals.
04/1985
04/30/1985US4514852 Process for protected transmission of digital signals
04/30/1985CA1186378A1 Local orderwire facility for fiber optic communication system
04/24/1985EP0138693A1 Method and apparatus for supervising digital radio transmission line
04/24/1985EP0138135A2 Plant management system
04/24/1985EP0137928A2 Data exchange flow control method and apparatus
04/17/1985EP0137695A2 Method of signal transmission with selected signal transmission rate
04/17/1985EP0137563A2 Switching method with automatic data phase resetting over +/- 3.5 bitsand device for carrying out said method
04/16/1985US4511859 Apparatus for generating a common output signal as a function of any of a plurality of diverse input signals
04/09/1985US4510611 Transceiver circuit for interfacing between a power line communication system and a data processor
04/09/1985US4510594 In a packet communication system
03/1985
03/28/1985WO1985001407A1 Digital signal processor modem
03/27/1985EP0135255A2 Inter-frame encoding/decoding equipment provided with a system for detecting a transmission error
03/27/1985EP0134817A1 Method of transferring digital signal
03/26/1985US4507783 Error detection circuitry for digital systems
03/26/1985US4507782 Method and apparatus of packet switching
03/26/1985US4507621 Generating quasi-random sequences in AMI code
03/19/1985US4506385 Radio reception path monitor for a diversity system
03/19/1985US4506357 Method and apparatus for switching loop type transmission lines
03/13/1985EP0134101A2 Differentially nonlinear convolutional channel coding with expanded set of signalling alphabets
03/12/1985US4504945 Computer network system
03/05/1985US4503545 In a data communication system
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