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5890169 |
Disk fragmentation reduction using file allocation tables
A combined file allocation table file system (CFAT file system) uses two or more FAT file systems with different cluster sizes to form a single user visible FAT file system to reduce disk...
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5872529 |
Dynamic datastream compression/decompression
A dynamic run-length encoding scheme compresses data streams more effectively than conventional run-length encoding, which uses a fixed group length for encoding. With dynamic compression according...
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5870037 |
Method and apparatus, demodulating method and signal demodulating apparatus
In the present invention, a partly duplexed conversion table is used as a conversion table for converting an M-bit based data string directly into an N-bit based code string without using margin...
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5864716 |
Tagged data compression for parallel port interface
A bi-directional data pipeline for interfacing a memory with a communications port includes a series of four pipeline elements comprising two DMA buffers and first and second holding registers. A...
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5859601 |
Method and apparatus for implementing maximum transition run codes
Apparatus and method for coding to improve the minimum distance properties of sequence detectors operating at high densities in storage systems is presented. The coding scheme of the present...
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5859600 |
Apparatus for modulating digital data and adding control data
An apparatus for modulating input data so that at least a part of a predetermined number of the input data is influenced by control data and adding the control data every predetermined number of...
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5854596 |
Encoding arrangement and method for encoding (n-1)-bit information words into n-bit channel words and decoding arrangement and method for decoding the channel words into information words
An encoding arrangement, a method for encoding (n-1)-bit information words into n-bit channel words, and a decoding arrangement and method for decoding the channel words into information words, in...
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5854809 |
Data recovery method and apparatus for jitter tolerant peak detected channels
A data recovery technique for jitter tolerant peak detected channels. The number of consecutive zeros between ones are reproduced in a run-length coded, peak detected channel. The interval (time,...
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5844508 |
Data coding method, data decoding method, data compression apparatus, and data decompression apparatus
A data compression and decompression apparatus and method providing a high compression ratio. The data compressing apparatus includes, for example, an obtaining section, a first coding section, a...
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5841379 |
Method and apparatus for selectively counting consecutive bits
A method for compression of digital data in a computer having a processor and a memory, wherein a group of consecutive bits having the same binary value is represented by a result number...
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5838738 |
Coding to improve timing recovery in a sampled amplitude read channel
A partial response class-IV (PR4) read channel is disclosed for magnetic recording including a coding scheme which improves timing recovery by providing a more accurate phase error estimate. The...
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5828326 |
Method of encoding and decoding for data transmission
In a method for transmitting digital data of images, etc., under the condition of n>m and k<n-m, when the synchronous data are not transmitted, the image data of "m" bits for the respective...
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5821883 |
Data modulation apparatus and data modulation apparatus including means for adding constant data to the ends of input address data and recording data necessary for run-length limited (1,7) decoding
A data modulation apparatus for modulating data by run-length limited (1,7) modulation including constant data adding means for receiving input data and adding constant data after the input data,...
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5818363 |
Runlength coding apparatus for use in a video signal encoding system
A runlength coding apparatus converts an input data stream including a plurality of zeros and non-zero values to a runlength coded signal. The apparatus has an input buffer, a runlength detector,...
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5815514 |
Variable rate bit inserter for digital data storage
A variable rate bit inserter is provided which efficiently encodes data prior to writing to a magnetic storage media. In a preferred embodiment, the bit insertion technique monitors the phase and...
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5812073 |
Method and apparatus for generating run-length limited code
A method and an apparatus are provided for generating an (4,20) RLL modulation code having a decreased detectible window width and an increased recording density ratio. The code's spectrum is...
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5809565 |
Method of and device for writing and reading data items in a memory system including a data item memory and a length memory
Data items associated with different locations in a spatial field of locations are written in a memory. The memory comprises a length memory in which for each location there is stored a length code...
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5784010 |
Method and apparatus for implementing a set rate code for data channels with alternate 9-bit code words and 8-bit code words
A data encoding method and apparatus are provided for implementing a predefined rate code, such as a 16/17 rate code for a data detection channel in a direct access storage device. A binary data...
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5781133 |
Method and apparatus for implementing run length limited codes
An apparatus encodes data blocks into code blocks, each code block containing more symbols than its respective data block. The apparatus includes a data block latch for receiving individual data...
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5781130 |
M-ary (d,k) runlength limited coding for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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5778253 |
No repeat byte compression method for achieving high speed data transfer from a parallel port
The present invention removes restrictions on the maximum data transfer rate provided by the Centronics® and PC-compatible parallel interface (i.e., standard parallel interface). Further, the...
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5774078 |
Single merging bit DC-suppressed run length limited coding
The information to be recorded is divided into 8-bit long data words. Each data word is then converted to 14-bit long code word. The code words are sequentially connected with a one-bit merging bit...
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5767798 |
Modulation code encoder and/or decoder
Modulation code encoder/decoder for a (2,9) RLL modulation code are provided. The modulation code encoder includes a serial-to-parallel converter, a controller, an inverter, a first and second...
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5760717 |
Method and circuit arrangement for the generation of a channel-coded binary signal
Low-redundancy codes are increasingly being striven for, such codes thus inevitably requiring comparatively long code words. However, since the memory requirement for coding tables increases...
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5757293 |
M=8 (1,2) runlength limited code for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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5757296 |
Data decoding apparatus and method and recording medium
Even if an element such as a ROM is not used, a code reverse conversion can be realized by a sufficiently small scale circuit to be effective for integration. When code data group converted from...
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5757294 |
Rate 24/25 modulation code for PRML recording channels
Rate 24/25 modulation encoding methods and apparatus improve efficiency in a PRML magnetic recording channel. The rate 24/25 code word uses rate 8/9 RLL encoding of one byte of user data, combined...
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5757822 |
Bit-interleaved rate 16/17 modulation code with three-way byte-interleaved ECC
A modulation method generates a rate 16/17 (d=0, G=7/I=11) modulation code for transferring user digital data bytes having a three-way ECC interleave through a data transfer channel in accordance...
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5751231 |
Method and apparatus for run-length encoding using special long-run codes
Magnitudes of runs of constant signal value in signals representative of physical activities or objects are determined. The signals are converted to fixed-length run-length (RL) codes, wherein each...
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5751232 |
High-efficiency encoding apparatus and high-efficiency decoding apparatus
A high-efficiency encoding apparatus having a data division circuit which applies 1-dimensional scanning to the orthogonal-transformed data obtained by applying orthogonal transformation to blocked...
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5748117 |
M=8 (1,3) runlength limited code for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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5748118 |
M=7 (3,8) runlength limited code for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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5748119 |
Devices and methods for channel-encoding and channel-decoding of digital data
Channel-encoding and channel-decoding of a (d, k, m, n) code are disclosed. An m-bit input word is encoded to an (n-d+1)-bit channel word by an encoding table. One or more merge bits are added to...
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5742244 |
Nonlinear run-length coding
An input string of binary data bits which is a random sequence of 0s and 1s is selectively spaced encoded into an output string of binary channel bits which is a sequence of 0s and 1s. An input...
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5742243 |
Method and apparatus for reducing DC component of RLL codes
Data converting method and apparatus for forming an RLL code which can perform a control to eliminate a DC component without an increase in number of bits. Natural numbers m, n, d, k, and k,...
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5739783 |
Data recording apparatus
An apparatus for encoding a digital signal includes switching means for alternately outputting the digital signal from first and second output terminals at every bit, a first converting means for...
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5740186 |
Apparatus and method for error correction based on transmission code violations and parity
The present invention is directed to a method and apparatus to correct errors in bits of binary coded data transmitted from a first electronic device to a second electronic device by providing a...
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5739779 |
Encoding circuit and decoding circuit
Several different types of look-up tables are available in the present invention. That is, one look-up table is selected for each m-bit dataword according to the number of consecutive 0's at lower...
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5737142 |
Servo track address channel code for PR4 magnetic recording
A rate 5/7, d=0 channel code encodes a Gray code servo track address into channel data recorded on a magnetic disk; a PR4 sliding threshold Viterbi sequence detector detects the recorded servo...
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5734340 |
Method and apparatus for storing run-intensive information in compact form
A method for compressing FAT and FAT-like structures, which include runs of primitives and runs intervening codes, includes the steps of receiving a plurality of primitive runs in a memory and...
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5731768 |
Method and apparatus for implementing codes with maximum transition run length
Encoding and decoding systems for data blocks based on forming corresponding code blocks having a maximum number of successive repetitions of a first symbol and a maximum number of successive...
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5729224 |
Code conversion and demodulation apparatus, a method thereof, and a recording medium
Source data each consisting of m-bits can be converted into conversion codes each consisting of n (>m) bits with ease, and reverse conversion thereof can be performed with ease. The code...
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5710561 |
Method and apparatus for double run-length encoding of binary data
A method and apparatus for losslessly compressing binary data using a technique referred to as Double Run-Length Encoding (DRLE). DRLE has particular application to the compression of gray-scale...
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5703580 |
Apparatus for encoding and decoding run length limited code data
The present invention relates to an apparatus for modulating input data by encoding the data to a run length limited (RLL) code data satisfying the (d,k,m,n) condition and decoding the modulated...
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5701310 |
Data detection apparatus
A data detection apparatus retrieved binary data modulated in conformity with the (d, k) constraint from an analog signal includes a timing extracting unit for generating a timing signal...
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5699061 |
Method and apparatus for generating NRZI code with limited runs of ones
An 8➝10 modulator stores a conversion table, and, when receiving 8-bit data as an address, outputs 10-bit data stored at the received address as a modulated code. The conversion table of the...
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5689254 |
Decoding circuit for runlength codes
After all the data words stored in a first scan transform RAM are initialized to "0"s, only signed level data words are overwritten, based on zero runlength data words, on "0"s at the positions...
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5686914 |
Information processing system
An information processing system has an arithmetic processing unit and an external memory storage detachably connected to the arithmetic processing unit and, further has the shared data processing...
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5682155 |
M=6(4,11) runlength limited code for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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5682154 |
M=4 (1,2) runlength limited code for multi-level data
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder...
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