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该文提出一种新的用于数字磁存储的游程长度受限码(run-lengthlimited:RLL)方法。按照此法建立了码字分类模型,并给出了码率为2/3的RLL(0,1)码的编解码方法和具体解码器的实现原理。将这种2/3码与熵最大的RLL(0,1)码及目前其他用于磁带存储的编码进行比较,结果表明:2/3码的编码效率比码率为2/4的RLL(0,1)编码提高了33.32%,从而以相应比例提高了容量;低频段功率谱密度比目前用于磁带存储的码率为4/5的RLL(0,2)码降低约2.6dB,能更有效地控制信号的直流分量。新的编码在提高存储容量的同时增强了数据读出的稳定性。
This paper proposes a new run-length limited (RLL) method for digital magnetic storage. According to this method, a codeword classification model is established, and the coding and decoding method of RLL (0,1) code with 2/3 code rate and the realization principle of the specific decoder are given. Comparing this 2/3 code with the RLL (0,1) code with the largest entropy and the other codes currently used for tape storage, the result shows that the coding efficiency of 2/3 code is higher than that of 2/4 code rate RLL 0, 1) code increased by 33.32%, so as to increase the capacity in the corresponding ratio. The low-band power spectral density is about 2.6dB lower than the RLL (0,2) code which is currently used for tape storage and has a rate of 4/5 Control the DC component of the signal more effectively. The new code increases the storage capacity while enhancing the stability of data readout.