Abstract: An apparatus and method for recording and/or reproducing data on a disc using padding information, and a corresponding information storage medium. The recording method includes recording a recording unit block in which invalid data is padded in part of the block and recording padding information indicating that the invalid data is included. According to the method, a disc drive becomes able to distinguish valid data from invalid data in an error correction block such that reliability of reproduction increases and stability of the system is improved.

Abstract: A soft demodulation method and apparatus including calculating partial sums for a unit of each predetermined number of bits of a codeword received from a channel; calculating a value of each entry of the decoding table by referring to the partial sums; and detecting a maximum among values of all entries of the decoding table and calculating a log-likelihood ratio (LLR) using the detected maximum. Accordingly, it is possible to reduce the amount of computation required to perform a soft demodulation process using run-length limited (RLL) codes and to simplify the soft demodulation process.

Abstract: A method and apparatus for generating parity information for error correction using a parity check matrix, rows of which correspond to a message word length m, columns of which correspond to a codeword length n, the number of “ones” included in the rows and columns is fixed, and remaining elements are all “zeros”, the error correction method includes obtaining a p number of parity information using the parity check matrix and predetermined message data S, wherein a matrix including a k number of columns from a (n-m+1)-th element of the parity check matrix is created with a lower triangular matrix form, all elements within the upper triangular portion of the lower triangular form are “zeros”, using a column and row permutation method.

Abstract: An optical information recording medium, a data recording apparatus, a data recording method used by the recording apparatus, and a data reproducing apparatus are provided, in which the optical information recording medium includes data provided in one or more recording blocks. A recording block of the optical information recording medium is generated by alternately arranging identifiers from ones of error correction code (ECC) blocks in the recording block, wherein each ECC block comprises a plurality of sectors having corresponding identifiers.

Abstract: An optical information recording medium, a data recording apparatus, a data recording method used by the recording apparatus, and a data reproducing apparatus are provided, in which the optical information recording medium includes data provided in one or more recording blocks. A recording block of the optical information recording medium is generated by alternately arranging identifiers from ones of error correction code (ECC) blocks in the recording block, wherein each ECC block comprises a plurality of sectors having corresponding identifiers.

Abstract: A circuit which recovers a synchronization code, and a method thereof. Where a synchronization code is not detected from an incoming bitstream, a plurality of synchronization code recovery candidate patterns are compared with an original synchronization pattern, and location data to produce an optimal synchronization pattern is determined and generated on the basis of a result of the comparison. The synchronization code is recovered to a location corresponding to the location data. Alternatively, where a synchronization code is not detected from an incoming bitstream, a plurality of synchronization code recovery candidate patterns are error-corrected, and location data to produce an optimal synchronization pattern is determined and generated on the basis of a result of the error correction. The synchronization code is recovered to a location corresponding to the location data.

Abstract: A demodulation apparatus and method using a code table that decreases complexity. The demodulation apparatus includes a code table including a plurality of the code words, wherein similar ones of the code words are arranged to be grouped together; and a soft demodulator to calculate probabilities of individual bits that constitute the code words, and to generate a soft demodulation value of the data word.

Abstract: A disc recording/reproducing apparatus for recording/reproducing multi-channel data simultaneously on a recording medium, the apparatus including channel buffers for recording/reproducing corresponding to the multi-channels, and a recording/reproducing controller for, if there is a channel buffer is filled with data to be recorded among the allocated channel buffers for recording, reading data from the channel buffer to record the data on the allocated continuous space, and if there is an empty channel buffer among the allocated channel buffers for reproducing, writing data read from the recording medium to the empty channel buffer. In the apparatus, the size of the continuous space on the recording medium, the size of the channel buffers for recording, and the size of the channel buffers for reproducing are allocated based on recording/reproducing speed information of a channel in which recording/reproducing is required according to a recording/reproducing request.

Abstract: A circuit which recovers a synchronization code, and a method thereof. Where a synchronization code is not detected from an incoming bitstream, a plurality of synchronization code recovery candidate patterns are compared with an original synchronization pattern, and location data to produce an optimal synchronization pattern is determined and generated on the basis of a result of the comparison. The synchronization code is recovered to a location corresponding to the location data. Alternatively, where a synchronization code is not detected from an incoming bitstream, a plurality of synchronization code recovery candidate patterns are error-corrected, and location data to produce an optimal synchronization pattern is determined and generated on the basis of a result of the error correction. The synchronization code is recovered to a location corresponding to the location data.

Abstract: A decoding method and an apparatus operate by performing error correction on code words of an error correcting code block in one direction selected from a row direction and a column direction, indicating in error flags the remaining code words except at least some code words from code words having uncorrectable errors, and performing error correction on code words in the other direction based on the error flags. Accordingly, errors that have been conventionally considered as being uncorrectable may now be corrected.

Abstract: Provided is a method of recording data on an optical recording medium having a plurality of addressable unit areas. 62 sync frames, each having a sync code and data, can be recorded in each of the addressable unit areas. Thus, user data can be recorded on a recordable optical disc at a higher density.

Abstract: An apparatus, method, and an optical storage medium to generate an error correction block include a data block generation unit processing digital data on a byte-by-byte basis and arranging the processed digital data from 0th to (N−1)th columns and from 0th to (M−1)th rows to form (M×N) data blocks. A matrix block generation unit arranges the (M×N) data blocks in K rows according to a data transmission sequence to form a matrix block. A first codeword generation unit adds a first error correction check word of 2×K bytes to each of N columns to form a first codeword of ((K×M)+2×K) bytes. A second codeword generation unit adds a second error correction check word of P bytes to each of ((K×M)+2×K) rows to form a second codeword of (N+P) bytes.

Abstract: An interleaving method for a high density recording medium and an interleaving circuit therefor. In this circuit, an intrablock interleaver interleaves received data having a predetermined error correction code within an error correction block to output intrablock-interleaved data. An interblock interleaver interleaves the intrablock-interleaved data between the error correction blocks in units of a predetermined number of the error correction blocks to output interblock-interleaved data. Accordingly, the capability of correcting a burst error due to a scratch on a disc is improved while maintaining compatibility with a general DVD format in an error correction format. Also, each row having position information is not interleaved while interblock interleaving is performed, so that a similar access time to the access time in a DVD is achieved. Therefore, high-speed searching is possible.

Abstract: An optical recording medium, a data recording or reproducing apparatus, and a data recording or reproducing method used by the data recording or reproducing apparatus. In a method of recording data on an optical disc, each of a plurality of error correction code (ECC) blocks is divided into a plurality of partitions. Next, data from the partitions is interleaved so that each of the ECC blocks is alternately and equally selected to generate a recording block. The generated recording block is modulated and recorded on an optical disc. As a result, the optical recording medium, the data recording apparatus, and the data recording method used by the apparatus are compatible with the format of a conventional digital versatile disc (DVD) and have higher error correction rates. In a reproducing method, the recording block is deinterleaved.

Abstract: An optical information recording medium, a data recording apparatus, a data recording method used by the recording apparatus, and a data reproducing apparatus are provided. The optical information recording medium contains data included in one or more recording blocks. Identifiers included in a plurality of sectors comprising a plurality of error correction code (ECC) blocks are sequentially extracted so that the ECC blocks are equally selected, and are alternately arranged at predetermined intervals. As a result, the optical information recording medium, the data recording apparatus, and the data recording method used by the apparatus, which have higher error correction rates, are provided.

Abstract: An optical recording medium storing information for regarding data in the current sector as data in a linking loss area, and an apparatus and method providing linking data . The data link method includes dividing an error correction code block having a predetermined size into a plurality of sectors and checking data type identification information which indicates whether or not data in each sector is linking data; and replacing main data of a sector with predetermined data according to the result of checking the data type identification information. According to the above method, data type information is checked to determine whether or not to replace main data of the current sector with dummy data. By doing so, error occurrence of the prior art can be prevented and block error correction is carried out more effectively.

Abstract: A data recording method error-correction-code (ECC)-encodes and modulates data of a file to be recorded in units of data blocks, and records the encoded and modulated data on a digital versatile disk-random access memory (DVD-RAM). Dummy data is added to make a last data block when the size of a file to be recorded is not an integer multiple of a data block, and then the last data block is ECC-encoded and modulated for recording the same on a DVD-RAM. The recording of data is performed in a recording region of a DVD-RAM where no data is recorded, and also starts from a recording region just next to the last data even when the last data of the previously recorded file includes dummy data.

Abstract: An error correcting apparatus and method of a digital processing system. The error correcting apparatus of the digital processing system includes a demodulator for demodulating channel data to source data and generating an error flag when an error occurs during demodulation, a synchronous detector for receiving the error flag and demodulation data generated from the demodulator and detecting a synchronizing signal to distinguish data by a unit of code which can correct an error, a first decoder for decoding the demodulation data and the error flag by a unit of row by the synchronizing signal to correct an error and an erasure, and a second decoder for decoding the demodulation data and the error flag by a unit of column by the synchronizing signal to correct an error and an erasure.

Abstract: 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 concentrated in the low-frequency band, thereby improving the signal-to-noise ratio. In addition, the hardware of an encoder and a decoder can be easily implemented since the modulation code has a fixed codeword length.

Abstract: A method and apparatus for recording and/or reproducing digital image data is disclosed which are compressed by an interleaving process using a logic product code.