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    • 56. 发明授权
    • Digital magnetic recording/reproducing apparatus
    • 数字磁记录/重放装置
    • US06320916B1
    • 2001-11-20
    • US09185097
    • 1998-11-03
    • Naoya KobayashiSeiichi MitaMasaharu KondoHideki SawaguchiTakashi Moriyasu
    • Naoya KobayashiSeiichi MitaMasaharu KondoHideki SawaguchiTakashi Moriyasu
    • H03D100
    • H03M13/6331G11B20/10G11B20/18H03M13/09H03M13/41H03M13/4115H03M13/4184H03M13/6343H03M13/6502H03M13/6505H04L25/03178
    • A digital magnetic recording/reproducing apparatus that has an LVA detector, and that is able to maintain the coding rate as high as {fraction (8/9)} or more, and record at a higher density than in the prior art, wherein, in order that the data sequences up to the (2n−1)th best sequence (n>1) are obtained in the order of higher likelihood ratios, and that. the candidates of those data sequences can be produced, the LVA detector has provided therein a unit which replaces the likelihood ratio and path memory of the ith best sequence by those of the (2i−1)th best sequence when the contents of the (i−1)th path memory coincide with those of the ith path memory (i=2, 3, . . . , n) and the absolute value of the likelihood ratio difference between the (i−1)th best sequence and the (2i−1)th best sequence is smaller than a decision threshold, or a unit which initializes the likelihood ratio of the ith best sequence to be a constant difference value added to the likelihood ratio of the (i−1)th best sequence when the contents of the (i−1)th path memory and the ith (i=2, 3, . . . , n) path memory of the n candidates of data sequences are coincident.
    • 具有LVA检测器的数字磁记录/再现装置,其能够将编码率保持为高达{分数(8/9)}或更大,并且以比现有技术更高的密度进行记录,其中, 为了获得高达(2n-1)个最佳序列(n> 1)的数据序列是以较高似然比的顺序获得的。 可以产生这些数据序列的候选,LVA检测器在其中提供了一个单元,其当第(i)个(i-1)的内容被替换为第(2i-1)个最佳序列时的第i个最佳序列的似然比和路径存储器 -1)路径存储器与第i路径存储器(i = 2,3,...,n)的路径存储器一致,并且第(i-1)个最佳序列与(2i)的最佳序列之间的似然比差的绝对值 -1)的最佳序列小于判定阈值,或将第i个最佳序列的似然比初始化为当第(i-1)个最佳序列的似然比加到内容的第i-1个最佳序列的似然比时的单位, (i-1)路径存储器和n个候选数据序列的第i(i = 2,3,...,n)路径存储器是一致的。