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| Number | Title | Issue Date |
| 6670896 | Method and apparatus for modulating and demodulating digital data Main encoding tables are normally used in modulating "p"-bit input data words into "q"-bit output code words. First and second substitution encoding tables are periodically used instead of the main encoding tables in the modulation. Regarding the modulati... | 12/30/2003 |
| 6664904 | Method and device for recovering RLL constrained data to be decoded A method for recovering a data required to have n consecutive and repetitive bits is disclosed. The data is obtained by converting a sample value sequence into a binary sequence according to a preset value and the data having n-1 consecutive first-level b... | 12/16/2003 |
| 6661356 | Method and apparatus for DC-level constrained coding A method and apparatus reduces a DC level of an input word. The input word is divided into a plurality of components that include n symbols. The n symbols of the components are summed for each component. The component is encoded into a substitute componen... | 12/09/2003 |
| 6657561 | Data decompression system and method A method and system for decompressing image data in a digital scanning system such as a printer. A plurality of streams of digital data are received in a compressed format. The compressed format contains a control byte preceding a plurality of data bytes.... | 12/02/2003 |
| 6657967 | Dummy bit elimination device and coding apparatus for FEC code word A dummy bit elimination device in a coding apparatus for use in a submarine cable system. The dummy bit elimination device has a converter for eliminating only dummy bits from FEC (Forward Error Correction) code. The coding apparatus has an optical-to-ele... | 12/02/2003 |
| 6653951 | Circuit and method for protecting the minimum run length in RLL code A circuit and method for protecting the minimum run length in RLL code is disclosed. The circuit comprises three state processors, each having a plurality of registers, including a decision bit, an invalid bit, metric bits and path bit array, and changing... | 11/25/2003 |
| 6654425 | Method and circuit for digital modulation and method and circuit for digital demodulation A digital modulation method in which at a head of an input block (pre-translation), each of a plurality of different types of initial data of t bits is multiplexed to generate a plurality of different types of multiplexed blocks, t bits at the head and im... | 11/25/2003 |
| 6653952 | Modulation method, modulation apparatus, demodulation method, demodulation apparatus, information recording medium, information transmission method, and information transmission apparatus There is disclosed a modulation method in which a four bit unit of a plurality of continuous input data words is encoded into a six bit unit of a plurality of continuous output code words by referring to a plurality of coding tables including output code ... | 11/25/2003 |
| 6650257 | Information carrier, device for encoding, method for encoding, device for decoding and method for decoding An information carrier includes runlength limited marks in a track. The runlengths of the marks represent main channel bits and variations of a further parameter of the marks representing secondary channel bits. Not all marks have the variations, only mar... | 11/18/2003 |
| 6646575 | Circuit and method for protecting the run length in RLL code A circuit and method for protecting the run length in RLL (run length limited) code is proposed to correct the illegal run length in an EFM (eight to fourteen modulation) signal. The proposed circuit comprises a sampling unit for sampling a RF signal with... | 11/11/2003 |
| 6642862 | Method for encoding/decoding digital data transmitted through a serial link, particularly of the 8B/10 type, and device for implementing same A method and a device is disclosed for encoding/decoding digital data transmitted through a serial link, particularly of the so-called "8B/10B" type. A full encoded binary word includes 8 data bits and a 2-bit label. The logical state of a center bit trip... | 11/04/2003 |
| 6639524 | Method and apparatus for coding information, method and apparatus for decoding coded information, method of fabricating a recording medium, the recording medium and modulated signal A coding device and method in which m-bit information words are converted into n-bit code words such that the coding rate m/n is greater than 1/2. The coding device and method are also employed to record information on a recording medium and to transmit i... | 10/28/2003 |
| 6639525 | METHOD OF CONVERTING A STREAM OF DATABITS OF A BINARY INFORMATION SIGNAL INTO A STREAM OF DATABITS OF A CONSTRAINED BINARY CHANNEL SIGNAL, DEVICE FOR ENCODING, SIGNAL COMPRISING A STREAM OF DATABITS OF A CONSTRAINED BINARY CHANNEL SIGNAL, RECORD CARRIER, AND DEVICE FOR DECODING A sequence of n-bit information words is converted into a sequence of corresponding channel words, some channel words having mi-bits and other channel words having m2-bits, and the sequence of channel words is transmitted. The information words are conver... | 10/28/2003 |
| 6628215 | Method and apparatus for binary encoding logic circuits A method and apparatus for state assignment of a logic circuit comprises receiving internal state representations for the logic circuit, determining binary code for the internal state representations by successively dividing the states into disjoint sets ... | 09/30/2003 |
| 6624764 | Signal transmission device for minimizing simultaneous switching noise in integrated circuit chip and the signal transmission method thereof A signal transmission device which transmits n-bit parallel digital signals through an I/O driver to minimize simultaneous switching noise in an integrated circuit chip is proposed. The signal transmission device includes an encoder coupled to the I/O dri... | 09/23/2003 |
| 6624763 | Multiplexing an additional bit stream with a primary bit stream Multiplexing an additional bit stream with a primary bit stream, where the primary bit stream is encoded into an xB/yB encoded bit stream, involves selecting yB code-words to convey the additional bit stream. Each xB word is represented by one yB code-wor... | 09/23/2003 |
| 6617984 | 16B/20B encoder A scalable physical coding sublayer (PCS) can be adjusted to provide different combinations of communication channels and data widths. The PCS can use 8B/10B encoders having a disparity input connection and at least one disparity output connection. In one... | 09/09/2003 |
| 6617985 | Method and/or apparatus for implementing constraint codes with low error propagation A method for generating constraint codes in a stream of data having a plurality of multi-bit source words, comprising the steps of (A) checking a sequence portion of the multi-bit source words for one or more constraint violations and (B) if no constraint... | 09/09/2003 |
| 6614369 | DC balanced 7B/8B, 9B/10B, and partitioned DC balanced 12B/14B, 17B/20B, and 16B/18B transmission codes The present invention provides techniques for classifying disparities and source vectors for 7B/8B and 9B/10B transmission codes, which are then used to minimize the complexity of decoding and encoding for 16B/18B codes. The classifications are determined... | 09/02/2003 |
| 6606038 | Method and apparatus of converting a series of data words into modulated signals A method and apparatus of converting a series of data words into modulated signals are provided. This method generates for each data word a number of intermediate sequences by combining mutually different digital words with that data word, scrambles these... | 08/12/2003 |
| 6606728 | Rate (M/N) code encoder, detector, and decoder for control data A system for block encoding and block decoding of servo data with a rate (M/N) code, where M is an integer greater than 1 and N is an integer that is greater than M. Two codes are described for the encoding and decoding processes: a rate (2/6) code and a ... | 08/12/2003 |
| 6603412 | Interleaved coder and method Quasi-parallel read/write interleaver architecture for data blocks by sequential spreading of variable size data subblocks into memory banks with bank address contention initiating the next data subblock. Iterative Turbo decoders with MAP decoders use suc... | 08/05/2003 |
| 6600431 | Data modulation and correction methods for use with data written to and read from recording media A data modulation method resistant to channel distortion and a method of correcting error in data coded by the modulation method. The data modulation method uses a run length limited (RLL) modulation code applied to write data to an optical storage medium... | 07/29/2003 |
| 6597295 | Decoding apparatus and decoding method A data-decoding apparatus having bit-detecting section 4. In the apparatus, an RF signal is reproduced from a recording medium and converted to digital data. If the RF signal has a level (amplitude) equal to a comparator level, the bit-detecting section 4... | 07/22/2003 |
| 6587977 | o,k,m,/m recording code A method for encoding data to meet a maximum run length limitation is disclosed. In one embodiment, the method comprises the steps of: (1) providing user data that includes a plurality of bits, wherein said bits have a value of 1 or 0; (2) performing an E... | 07/01/2003 |
| 6587059 | Code and method for encoding data A code word includes a first group of data bits and includes code bits that represent a second group of data bits. One embodiment of the code word has a minimum probability of bit transitions among its bits. Another embodiment of the code word includes a ... | 07/01/2003 |
| 6577255 | Method and apparatus for encoding digital data Encoding tables are accorded with variable-length encoding rules using a variable constraint length. A DSV control bit is periodically inserted into a first input bit stream to generate a second input bit stream. Every m-bit piece of the second input bit ... | 06/10/2003 |
| 6574773 | Cost-effective high-throughput enumerative ENDEC employing a plurality of segmented compare tables A cost-effective high-throughput enumerative encoder is disclosed for encoding m-bit input datawords in an input data stream into n-bit output codewords in an encoded output data stream for use in a communication channel. The enumerative encoder comprises... | 06/03/2003 |
| 6573845 | Method for converting an analogue signal into a binary output signal A method for converting an analogue signal representing a runlength limited binary signal with runs of length of at least N into a binary output signal. The analogue signal is sampled and an intermediary binary signal is generated based on the sample anal... | 06/03/2003 |
| 6570511 | Data compression method and apparatus implemented with limited length character tables and compact string code utilization An LZW compressor implementation architecture utilizes a plurality of limited length character tables corresponding to the respective characters of the alphabet. A string is stored by storing the code associated with the string in the character table corr... | 05/27/2003 |
| 6559779 | Data encoding method, apparatus, and storage medium To convert a 12-bit data word into an 18-bit code word, the 12-bit data word is divided into the 8 high-order bits and the 4 low-order bits. The 8 high-order bits are converted into 12 bits and the 4 low-order bits are converted into 6 bits, thereby creat... | 05/06/2003 |
| 6545615 | DEVICE FOR ENCODING A STREAM OF DATABITS OF A BINARY SOURCE SIGNAL INTO A STREAM OF DATABITS OF A BINARY CHANNEL SIGNAL, MEMORY MEANS, DEVICE FOR RECORDING INFORMATION, RECORD CARRIER, DEVICE FOR CODING AND DEVICE FOR PLAYING BACK In a device for encoding a stream of databits of a binary source signal into a stream of databits of a binary channel signal the bitstream of the source signal is divided into n-bit source words. The device comprises converting means adapted to convert a ... | 04/08/2003 |
| 6542452 | Method and system for computing digital sum variation of a stream of channel-bit symbols A digital sum variation (DSV) computation method and system is proposed, which is capable of determining the DSV value of a bit stream of channel-bit symbols to thereby find the optimal merge-bit symbol for insertion between each succeeding pair of the ch... | 04/01/2003 |
| 6538586 | Data encoding strategy to reduce selected frequency components in a serial bit stream Frequency spectrums are determined for all possible codes given a predetermined number of bits in a code. A subset of these codes is formed based on spectral properties of codes in a desired frequency band. This subset of code is then used to encode data ... | 03/25/2003 |
| 6538583 | Method and apparatus for context modeling A system for encoding and decoding information of a codeblock from a memory buffer that includes a context modeler that receives from the memory buffer the codeblock and divides the codeblock into a plurality of codesegments or decodes a codeblock worth o... | 03/25/2003 |
| 6538585 | Distance-enhancing coding method The present invention pertains to a distance-enhancing coding method that can be applied to digital recording and digital communications. It improves the time-varying maximum transition run method used in a conventional distance-enhancing coding to avoid ... | 03/25/2003 |
| 6531968 | Digital data modulating method and apparatus and modulated data recording medium using the same A digital data modulating method wherein the last unit of a block consisting of predetermined units is received and a block is obtained which does not infringe A k-constraint in AN RLL code having (d, k) constraints on the basis of a modulation data table... | 03/11/2003 |
| 6529147 | Information carrier, device for encoding, method for encoding, device for decoding and method for decoding An information carrier includes runlength limited marks in a track. The runlengths of the marks represent main channel bits and variations of a further parameter of the marks representing secondary channel bits. Not all marks have the variations, only mar... | 03/04/2003 |
| 6510248 | Run-length decoder with error concealment capability A run-length based decoder for decoding compressed image data while allowing error to be contained with the length of a code word. The decoder includes: (a) a shifter for outputing Q+1 number of N-bit data streams; (b) Q+1 code comparators to respectively... | 01/21/2003 |
| 6505320 | Multiple-rate channel ENDEC in a commuted read/write channel for disk storage systems A sampled amplitude read channel is disclosed for writing data to and reading data from a disk storage medium. A first channel encoder encodes a first j-k bits of a j-bit data block to generate first encoded data, and an ECC encoder encodes the first enco... | 01/07/2003 |
