Abstract: A digital signal processing method and apparatus that provide a mechanism for controlling the output of digitally processed data in an optical disc player so as to reduce the probability of error and lost data during such output. In one aspect, an apparatus for processing information on an optical disc comprises a signal processor for processing a digital signal corresponding to an analog signal read from the optical disc to generate output data, a memory unit, operatively associated with the signal processor, for temporarily storing the output data in predetermined units under the control of the signal processor, and an output unit, operatively connected to the signal processor, for processing the output data based on the type of optical disc. The output unit generates a request signal that causes the signal processor to retrieve output data from the memory unit and transmit the retrieved output data to the output unit in parallel.

Abstract: A digital signal processing method and apparatus that provide a mechanism for controlling the output of digitally processed data in an optical disc player so as to reduce the probability of error and lost data during such output. In one aspect, an apparatus for processing information on an optical disc comprises a signal processor for processing a digital signal corresponding to an analog signal read from the optical disc to generate output data, a memory unit, operatively associated with the signal processor, for temporarily storing the output data in predetermined units under the control of the signal processor, and an output unit, operatively connected to the signal processor, for processing the output data based on the type of optical disc. The output unit generates a request signal that causes the signal processor to retrieve output data from the memory unit and transmit the retrieved output data to the output unit in parallel.

Abstract: An apparatus and method for searching for defective address of a recording medium are provided. The recording medium includes a main data storage unit and a defective data management unit having at least one defect management area including first and second defect lists, and repeatedly records and reproduces.

Abstract: In an error correcting method for correcting three or fewer errors or six or fewer erasures, syndromes S.sub.0 to S.sub.5 from a received codeword are calculated. If the calculated syndromes S.sub.0 to S.sub.5 are all zeros, it is determined that there is no error. If syndromes S.sub.0, S.sub.1, and S.sub.2 are zeros and at least one of the calculated syndromes S.sub.3, S.sub.4, and S.sub.5 is not zero, it is determined that error correction is impossible. Subsequently, if exactly two of syndromes S.sub.0, S.sub.1, and S.sub.2 are zeros, coefficients .sigma.1, .sigma.2, and .sigma.3 of an error-location polynomial are differently calculated depending on which of syndromes S.sub.0, S.sub.1, and S.sub.2 is not zero. The calculated coefficients are used to determine error locations, an error type, the possibility of error correction, and if error correction is possible error values. If more or fewer than two of syndromes S.sub.0, S.sub.1, and S.sub.

Abstract: A method for correcting multiple erroneous symbols included in data produces a demodulation flag indicating whether demodulation based on a modulation code such as EFM or ETM is possible. The demodulation flag is used in decoding the data based on the error correcting code. Producing the error locations during decoding in accordance with a Reed-Solomon code comprises the steps of producing an index using ##EQU1## provided .sigma..sub.1, .sigma..sub.2 and .sigma..sub.3 represent coefficients of an error location polynomial, k.sub.1 represents .sigma..sub.1.sup.2 +.sigma..sub.2 and k.sub.2 represents .sigma..sub.1 .sigma..sub.2 +.sigma..sub.3, reading out virtual roots from a specified memory related to the index, and transforming the virtual roots (Z.sub.1, Z.sub.2 and Z.sub.3) into error locations (x.sup.j1, x.sup.j2 and x.sup.j3) in accordance with the following equations.x.sup.j1 =Z.sub.1 (k.sub.1)+.sigma..sub.1x.sup.j2 =Z.sub.2 (k.sub.1)+.sigma..sub.1x.sup.j3 =Z.sub.3 (k.sub.1)+.sigma..sub.