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| Number | Title | Issue Date |
| 4755987 | High speed scrambling at lower clock speeds Circuitry generates a plurality of differently-phased m-sequences (or pseudo-random sequences) for scrambling/descrambling of all tributary data signals at a multiplexer/demultiplexer. By scrambling/descrambling at the tributary levels and thus at the low... | 07/05/1988 |
| 4744104 | Self-synchronizing scrambler A self-synchronizing scrambler for high bit rates has a number of scrambler stages supplied in parallel with bits of a signal to be scrambled, each scrambler stage having a series-connected pair of modulo-2 adders, and at least one shift register. A selec... | 05/10/1988 |
| 4736424 | Data scrambling apparatus A data scrambler-descrambler combination is illustrated which stores previously modified received data and alters data passing through on the basis of certain of the previously stored data bits. Additionally, the previously stored data is monitored to det... | 04/05/1988 |
| 4723246 | Integrated scrambler-encoder using PN sequence generator Simplified method and apparatus for performing integrated scrambling and encoding or descrambling and decoding of block code digital transmissions is disclosed. The method involves setting the scrambling length equal to an integer multiple of the block le... | 02/02/1988 |
| 4719624 | Multilevel multiplexing A synchronous PCM digital transmission system including multilevel multiplexing wherein the higher order multiplexers interleave two or more tributary signals each of which comprises a multiplexed plurality of subtributaries. Multiplexer framing is achiev... | 01/12/1988 |
| 4716587 | Broadband-signal broadcasting system A broadband signal broadcasting system comprising a circuit to encode video and audio signals forming a TV channel to be sent to a switching matrix, which is remotely operated by the subscriber; a circuit to multiplex two or more TV channel to be simultan... | 12/29/1987 |
| 4688218 | Multiplex channels for continuous flow for numerical signal A digital data pack transmission system is especially--but not exclusiveluseful in videotex or teletext transmission (i.e. videotext or teletext data is transmitted during intervals between segments of video signals). The inventive system uses a continuo... | 08/18/1987 |
| 4663501 | Self-synchronizing descrambler A self-synchronizing descrambler for high bit rates having a number of parallel operating descrambler stages each of which represents the series connection of first and second modulo-2 adders and at least one shift register stage for the suppression of sh... | 05/05/1987 |
| 4621355 | Method of synchronizing parallel channels of orthogonally multiplexed parallel data transmission system and improved automatic equalizer for use in such a transmission system A reference data sequence is transmitted and applied to a first automatic equalizer which is arranged in a reference channel. The transmitted reference data is used to establish an initial equalization of the first automatic equalizer. On the other hand, ... | 11/04/1986 |
| 4599719 | Full duplex data set with half-duplex emulation Half-duplex switched carrier operation is emulated in a full-duplex voiceband data transmission system by utilizing predetermined signal indications in each channel to signal the initiation and termination of user data in that channel and thus to control ... | 07/08/1986 |
| 4563546 | Method for preventing "compromising radiation" A method of preventing "compromising radiation" when processing and transmitting secret data information in data processing and long-distance data transmission systems. In addition to direct, physical shielding and/or decoupling of the data signals, a cod... | 01/07/1986 |
| 4451916 | Repeatered, multi-channel fiber optic communication network having fault isolation system A repeatered, multichannel fiber optic communication network includes a plurality of full duplex fiber optic channels and one or more auxiliary channels. In order to supervise and control the operation of the network, for both data transmission and fault/... | 05/29/1984 |
| 4431865 | Digital signal enciphering and deciphering apparatus and system A digital signal of n-bit words Ni is enciphered into an enciphered signal of n-bit words Ri. In an enciphering unit, a logic circuit delivers each enciphered word Ri through a logic operation g performed on the word N | 02/14/1984 |
| 4387460 | Supplementary information transmitting arrangement for a digital data transmission system This invention relates to an arrangement for transmitting a digital supplementary information signal having a low rate with a digital data signal having a high rate. The insertion of the supplementary information in the data signal is based on the modific... | 06/07/1983 |
| 4304962 | Data scrambler Binary digital data signal patterns containing either no transitions, periodically recurring transitions or both are randomized by constructing a key signal from a summation of selected stored digits of the data pattern and combining such key signal with ... | 12/08/1981 |
| 4264781 | Apparatus for encoding and decoding data signals An encoder/decoder is provided having two random bit generators which are cross-coupled in the Encoding mode with the data signal being directed to the input of each random bit generator. The data signal is also logically combined with the output of each ... | 04/28/1981 |
| 4214206 | Digital transmission system having direct bit extraction from scrambled bit streams Direct bit extraction from a scrambled bit stream for a digital transmission system in which a bit stream is divided into consecutive transmission frames, extra bits are inserted in given bit position of each transmission frame, the bit stream is scramble... | 07/22/1980 |
| 4150404 | Device for transferring digital information A data recording device having a coding device which is supplied with a sequence of information bits to be recorded. The coding device forms coded information words of at least two different lengths from the sequence of information bits. The recording dev... | 04/17/1979 |
| 4109856 | Method for transmitting binary signals Method and device for transmitting binary signals by means of digital self-synchronizing scramblers, the information of the storage elements used being utilized, in combination with that of the input signal, for detecting the degenerative condition of a l... | 08/29/1978 |
| 4071692 | Data transmission systems Intelligence is conveyed in a PCM bit stream form with alternate bits being inverted. Additional information is conveyed by violations of the alternate bit rule so that two successive bits have the same polarity. Prior to being coupled to the alternate ma... | 01/31/1978 |
| 3988538 | Digital data scrambler and descrambler A digital data scrambler and descrambler for m parallel synchronized digital data streams, where m is an integer greater than one, is disclosed. The scrambler and descrambler each include m linear sequential filters, each of the m filters being associated... | 10/26/1976 |
| 3978407 | Fast start-up adaptive equalizer communication system using two data transmission rates Initial Adjustment of a receiver having an automatic adaptive equalizer in a modem communication system is accomplished by employing a data transmission rate lower than normal for an early segment of each burst of signals. At this lower rate, accurate rec... | 08/31/1976 |
| 3931472 | Asynchronous quadriphase communications system and method A communications system and method for transmitting and receiving two independently timed (asynchronous) binary data signals on a quadriphase carrier. The four phase ambiguity ordinarily resulting from quadriphase transmission and reception is overcome by... | 01/06/1976 |
