一、概述在数字磁记录和遥测中通常要对经A/D变换后的量化数据编码。编码的主要目的是为了提高数据的记录密度和传输的可靠性。码型选择的依据则取决于仪器的应用条件及码的特性。对各种码型的评价已有很多的论述,在使用时往往根据不同的用途选择各种码型。在数据处理过程中常常把一种输入码型变换成其它码型以满足不同记录器的要求;在实验室里也希望能产生各种码型,以便对它们进行比较。 I. Overview In digital magnetic recording and telemetry, it is usually necessary to encode the quantized data after A / D conversion. The main purpose of coding is to improve the data recording density and transmission reliability. The choice of pattern depends on the instrument's application conditions and the characteristics of the code. The evaluation of a variety of patterns has been a lot of discussion, often when used according to different purposes choose a variety of patterns. In data processing, one input pattern is often transformed into other patterns to meet the requirements of different recorders. In the laboratory, it is also desirable to generate various patterns to compare with each other.