Abstract: An encoding and decoding method compressing and error-correction encoding an input 8-bit data to immunize the input data to noise and other signal distortion causing factors. The error-corrected data is encoded to 9-bit codewords modulated to be suitable for the channel characteristics of the storing device. A signal is generated for the input 8-bit data encoded to modulation codes, then pre-compensated and recorded. The generated signal is processed to be easily detected by reproducing the 9-bit codewords. The processed signal is detected to minimize an error rate. The detected signal is decoded according to channel characteristics, and recovered to the input 8-bit user data through error correction and compression decoding.

Abstract: A coding/decoding method for high density data recording/reproduction, and an encoder/decoder. In the coding method for encoding an 8-bit binary data symbol X.sub.k (k=1, 2, 3, . . . , 8), received from a storage device or a communications channel, into a 9-bit codeword Y.sub.l (l=1, 2, 3, . . . , 9), the number of a maximum transition run (MTR) is limited to a predetermined number, and the number of zero run lengths of the codeword whose MTR is limited is then limited to a predetermined number. Then, a pattern providing a bad effect on detection of a signal is removed from the codeword whose zero run length is limited. In the rate 8/9 modulation code having an MTR of 3, the code rate is high, and the path of the Viterbi detector is reduced as in the rate 2/3 RLL(1,7) code having an MTR of 2, thereby decreasing the delay and complexity of the detector.

Abstract: A coding/decoding method for high density data recording and reproduction uses 16/17 RLL(0,6/6) coding/decoding, and by adopting an encoder/decoder having a more straightforward structure, the coding/encoding method can reduce the size of the hardware required. An optimal lookup table as well as a simplified relational equation are provided between input and output for encoding/decoding the rate 16/17 RLL(0,6/6) block code.

Abstract: A method and device for detecting data of a data storing unit includes an analog/digital converter for outputting a symbol signal r.sub.k by sampling an analog signal r(t) with a sampling clock, an equalizer for outputting z.sub.k by equalizing the output r.sub.k of the analog/digital converter, a data detector for detecting symbol data a.sub.k from the equalized output z.sub.k, and a clock recovering portion for correcting frequency and phase of the sampling clock, the clock recovering portion performing the correction at an edge of a symbol data a.sub.k. Therefore, it is possible to reduce errors in detecting data and to effectively detect the data with a far better performance that conventional technology and to restore a sampling clock by limiting a sampling clock recovering process to operate only at the edge of the symbol data.

Abstract: A run length limited (RLL) code generation method for a data storage device is provided. In the RLL code generation method for generating a predetermined number of bit codewords, sequences of 16-bit data are received, and then sequences of 17-bit codewords are produced, wherein the sequences of 17-bit codewords has a first predetermined number of successive zeros as a maximum run length of zeros, and the sequences of 17-bit codewords include two subsequences each having a second predetermined number of successive zeros as a maximum run length of zeros. Thus, the RLL code generation method is helpful for an equalizer and provides a high recording density as well as a higher signal transmission rate compared to a rate 8/9(0,4/4) coding method.