提出了以提高线性记录密度为目的的优化选择结构参数的准则，同时对常用的几种RLL编码方式进行了比较。
The principle of optimal selection of RLL code parameters which achieve high linear density is also proposed. Comparisons of several RLL codes are given at last.
摘要阐述了声波变密度测井时对其进行测前、测后线性刻度及记录时差曲线的必要性。
It is necessary to record the linear scale before and after log and the time difference curve in the acoustic variable density log.
阐述了声波变密度测井时对其进行测前、测后线性刻度及记录时差曲线的必要性。
It is necessary to record the linear scale before and after log and the time difference curve in the acoustic variable density log.
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