Matches 101 - 150 out of 156 < 1 2 3 4 >
Match Document Document Title
5428628 Modular implementation for a parallelized key equation solver for linear algebraic codes  
Apparatus and method for implementing a parallelized algorithm for solving the key equation for the decoding of a linear algebraic code. Circuitry implements two computation sequences. One of these...
5428629 Error check code recomputation method time independent of message length  
In a data packet communications network capable of transmitting a digitally coded data packet message including an error-check code from a source node to a destination node over a selected...
5426426 Tokens for use in data communications systems  
A system for generating and substituting tokens for frequently used phrases within the information portion of messages comprises a central control terminal (140) and a selective call receiver...
5414720 Device and method using second error correction code for data in a recording medium  
A data reproduction device for reproducing a data recorded in a recording medium having a data area and an error correction area including only error correction code data. The areas are formed in...
5325374 Predictive decoding device for correcting code errors  
A decoding device used in a predictive coding method includes a replacement circuit for replacing a decoded value corresponding to an encoded code having an uncorrectable error with the decoded...
5325372 Implementation of the HDLC CRC calculation  
In accordance with the present invention, a multi-bit CRC character is created by generating a most significant bit (MSB) portion and a least significant bit (LSB) portion in parallel and then...
5323402 Programmable systolic BCH decoder  
A programmable decoder that provides both error and erasure decoding for all Reed-Solomon, primitive BCH, non-primitive BCH, and binary BCH codes of any rate over any field is disclosed. The user...
5313474 Method and apparatus to determine the log of an element in GF(2.sup.m) with the help of a small adjustable size table  
A system for determining the log of an element in Galois field GF(2 m ) using a small, selectable size table, a finite field multiplier, and a counter. The system allows for a flexible trade-off...
5311547 Partial-response-channel precoding  
Digital data is transmitted over partial-response channels using a precoding technique which allows for the use of a wide variety of transmit constellations. A sequence of signal points is selected...
5307377 System for modulating/demodulating digital signals transmitted with encoded modulation  
Encoding and decoding devices (5, 105) influencing digital signals transmitted with encoded modulation. For the encoding a channel encoder (12) performs a code concatenation to distribute the...
5278866 Radio communication apparatus with stored coding/decoding procedures  
A radio communication apparatus for transmitting and receiving a digital signal using a radio line which includes a memory means for storing a plurality of signal procedures in which each procedure...
5265104 Data storage system including redundant storage devices  
A data storage system including k data drives and n-k redundant drives performs a write operation to a designated sector on a data drive by (i) retrieving from each of the other data drives the...
5259003 Method of encoding two digital data signals  
A method to encode two digital data signals is disclosed. Each of the digital signals is characterized by a bit stream. An N bit block from the first signal is mapped to a unique M bit third signal...
5255288 Arrangement for converting binary input signal into corresponding in-phase and quadrature phase signals  
In order to effectively reduce a memory size of each of two memories provided in an arrangement for converting a binary input data into the corresponding inphase and quadrature signals, a memory...
5233629 Method and apparatus for communicating digital data using trellis coded QAM  
Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM for communicating information. Concatenated coding...
5222077 Radix mapping with variable number of symbols in mapping period  
The present invention is directed toward a method and apparatus in a communications device for mapping a selected group of data bits into a predetermined number of two-dimensional symbols selected...
5216676 BCH code decoder and method for decoding a BCH code  
In a BCH code decoder for correcting a natural number N of error bits occurring in a code sequence composed of bits encoded by a BCH encoding method, and a method therefor, first to N-th syndromes...
5212695 Error check or erro correction code coding device  
An error check or correction code coding device is disclosed. In this device, when a main information code is transmitted after an error check or correction code is added thereto, a control code is...
5200961 Error detection and/or correction device  
N symbols of a code word inputted from a transmission line and constituting an error detection and/or correction code are divided into i symbol groups, i coefficient groups are generated by...
5177746 Error correction circuit using a design based on a neural network model  
An error correction circuit is provided which uses NMOS and PMOS synapses to form neural network type responses to a coded multi-bit input. Use of MOS technology logic in error correction circuits...
5155734 Error correcting device  
There is provided an error correcting device for correcting errors of a received message in accordance with a processing program including a plurality of error correcting processes for correcting...
RE34088 On-the-fly error correction  
On-the-fly error correction is provided by using the remainder from division of the encoded codeword by its generator polynomial to look up error values and locations in a memory. Alternatively,...
5131011 Receiver for data transmission system with nonlinearities  
Non-linear intersymbol interference and noise in a received data signal are corrected through use of a Viterbi detector which estimates the most likely sequence of transmitted data symbols by...
5115453 Technique for designing a multidimensional signaling scheme  
In a system where a signal constellation is used for data communications, signal points in the signal constellation are selected to represent incoming data. The signal points, thus selected, are...
5040179 High data rate BCH encoder  
An encoder for selected linear error correcting codes, such as a BCH code, uses relatively low-speed circuitry to generate parities for correcting the code. A parity matrix derived from the BCH...
5031181 Error correction processing apparatus  
An error correcting apparatus including a circuit for detecting error correcting modes of incoming digital information, a generator for generating a first set of syndromes for a first error...
5010554 Error correction method and apparatus  
For forward error correction, the least significant bit of each multibit symbol is encoded before transmission according to a block code that has an over-all parity bit. Since even syndromes can be...
4958349 High data rate BCH decoder  
A decoder for selected linear error correcting codes, such as a BCH code, uses relatively low-speed circuitry to determine syndromes and corresponding error locations for correcting the code. In a...
4914660 Method and apparatus for decoding error correcting code  
A received signal train V(X) having a code length of 19 bits, in which an error correcting code is added on the basis of a generator polynominal G(X) of degree 11, is converted into a signal train...
4901318 Address generating circuit  
An address generating circuit (13) generates a reading address for reading a buffer memory (16) so that so-called P and Q codes for a CD-ROM which have parameters i and j can be decoded. The...
4899340 Error correcting code and error correcting circuit using the same  
An improved error correcting circuit that is adapted for correcting errors in data to be transmitted over communication links which require a minimum density of 1's to preserve timing on the...
4893312 Compact, real time tape drive system  
A nine track digital tape system operating in accordance with a feedback shift register redundancy scheme, includes in both the encoding and writing section and in the reading and error correction...
4856004 Microprocessor based BCH decoder  
A microprocessor based system which implements BCH decoder algorithms in a sufficiently efficient manner to allow real time BCH decoding of a BCH(255,131) code is disclosed. Table lookup operations...
4839896 Fast remainder decoding for a Reed-Solomon code  
Apparatus and methods are disclosed for providing fast decoding of Reed-Solomon and related codes. Cases of one and two data symbol errors are decoded directly from the remainder using a large...
4835772 Probabilistic fade forecasting  
A block of helically interleaved codewords is received in a de-interleaving array. A succession of codewords obtained from the de-interleaving array are decoded in a process in which each error...
4763331 Method for decoding error correcting block codes  
A soft decision decoding method which decodes a code having redundant bits added to information data bits and transmitted as an error correcting code and in which the received code is decoded bit...
4683571 Digital signal decoding system  
A digital signal decoding system comprises a terminal for receiving a digital signal through a transmission path, which digital signal is encoded so that an error in one bit can be corrected in...
4675869 Fast decoder and encoder for Reed-Solomon codes and recording/playback apparatus having such an encoder/decoder  
A decoding device for code words which are protected against the occurrence of several symbol errors per code word by means of a Reed-Solomon code is provided with a word buffer which comprises a...
4644543 Forward error correction hardware for a data adaptor  
An apparatus and a method is disclosed for correcting on-line error corrections in the digital transmission of voice or data utilizing forward error correction technique which avoids on-line...
4644545 Digital encoding and decoding apparatus  
Digital encoding and decoding apparatus for encoding data codes to produce disk codes and decoding disk codes to produce data codes. In the encoding and decoding operations performed by the...
4623999 Look-up table encoder for linear block codes  
An efficient look-up table encoder for encoding k bit information words with linear error correcting block codes is provided comprising a plurality of read-only memories having 2 x s , 2 x s , . ....
4599722 Apparatus for encoding and decoding digital data to permit error correction  
Apparatus to permit the correction of a single bit error occurring in a sequence of data packets (e.g. bytes) comprising data bits. An encoder produces an error correction packet (e.g. byte), the...
4567594 Reed-Solomon error detecting and correcting system employing pipelined processors  
Apparatus and methods are disclosed for providing on-line error detection and correction of errors in an optical disk storage system using Reed-Solomon decoding techniques. An implementation is...
4564944 Error correcting scheme  
A method and an apparatus are disclosed for converting error syndromes of an error-correcting code to pointers which identify the positions of the erroneous bits. Each syndrome is converted by a...
4509172 Double error correction - triple error detection code  
A code is generated using BCH coding theory which corrects double bit failures and detects triple failures and packaging errors. The code is a shortened code in which both data and check bit...
4473902 Error correcting code processing system  
A high speed code processing system for error correcting code is disclosed. It uses bit parallel residue generation for cyclic codes. This minimizes the time delay for cyclic code processing....
4468769 Error correcting system for correcting two or three simultaneous errors in a code  
An improved two or three error correcting system for BCH code (Bose, Chaudhuri, Hocquenghem code) has been found. In case of a two error correction system, a first syndrome A 1 and a second...
4360916 Method and apparatus for providing for two bits-error detection and correction  
A method and apparatus for detecting errors in a data word and for correcting up to two error bits therein through using Bose-Chaudhuri-Hocquenghem (BCH) codes. A Galois field table is arranged in...
4355391 Apparatus and method of error detection and/or correction in a data set  
Matrix multiplication is used to generate error detection and/or correction binary code bits from a binary input word. A matrix made up of columns and rows of bits set to binary "1"s and "0"s in a...
4271517 Circuit arrangement for the formation of check bits for binary data  
The invention relates to a circuit arrangement for coding or decoding comprising apparatus for forming check bits with the use of a linear code. The coding should be capable of adaptation to a...
Matches 101 - 150 out of 156 < 1 2 3 4 >