Digital signal processing method, data recording and reproducing apparatus, and data recording medium that are resistant to burst errors
View Patent ↗With two consecutive product-coded ECC blocks, EB 1 and EB 2 , as a set, the rth row of first ECB block EB 1 is followed by the rth row of second ECC block EB 2 in such a way that the first row of first ECC block EB 1 is followed by the first row of second ECB block EB 2 , which is followed by the second row of first ECC block ECB 1 , which is followed by the second row of second ECC block EB 2 , and so on, to interleave data on a row basis. That is, data of two ECC blocks, EB 1 and EB 2 , is allocated alternately on a row basis. This allocation method allows an error to be distributed after reproduction even when a serious burst error extending 18 rows occurs in an ECC block.
1. A digital signal processing method comprising the steps of:
dividing input digital data signals every predetermined number of words to generate K data sectors each composed of M rows×N columns;
dividing each data sector into two in a column direction to obtain first and latter K half data sectors each composed of M rows×N/2 columns;
generating inner parity data based on each row data of the first and latter K half data sectors;
generating outer parity data based on each column data of matrix data obtained by connecting the first and latter K half data sectors in the column direction; and
outputting the first and latter K half data sectors, the inner parity data, and the outer parity data;
wherein when a 1 st row of a first 1 st half data sector to a Mth row of a latter 1 st half sector are sequentially output in such a way that the 1 st row of the first 1 st half data sector, inner parity data with respect to the 1 st row of the first 1 st half data sector, the 1 st row of the latter 1 st half data sector, and inner parity data with respect to the 1 st row of the latter 1 st half data sector are sequentially output, and thus this output is repeated with respect to a 1 st data sector to a Kth data sector, one of each row of a first half outer parity data and each row of a latter half outer parity data generated on the basis of the K data sectors is alternately output for each data sector output.
2. A recording medium having first and latter K half data sectors, inner parity data, and outer parity data recorded therein, wherein the first and latter K half data sectors are obtained by dividing input digital data signals every predetermined number of words, thus generating K data sectors each composed of M rows ×N columns, and dividing each data sector into two in a column direction; each half data sector is composed of M rows×N/2 columns; the inner parity data is generated on the basis of each row data of the first and latter K half data sectors; and outer parity data is generated on the basis of each column data of matrix data obtained by connecting the first and latter K half data sectors in the column direction,
wherein when a 1 st row of a first 1 st half data sector to a Mth row of a latter 1 st half sector are sequentially arranged in such a way that the 1 st row of the first 1 st half data sector, inner parity data with respect to the 1 st row of the first 1 st half data sector, the 1 st row of the latter 1 st half data sector, and inner parity data with respect to the 1 st row of the latter 1 st half data sector are sequentially arranged, and thus this arrangement is repeated with respect to a 1 st data sector to a Kth data sector, one of each row of a first half outer parity data and each row of a latter half outer parity data generated on the basis of the K data sectors is alternately arranged for each data sector arrangement.