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The error sources of manual of line tracking and line synthesis of scanning are analyzed, and Suggestions to heighten two kinds of the precision of digitization data are put forward.
对手工数字化线跟踪误差和扫描数字化线综合误差的来源进行分析，提出改善这两种数字化数据精度的几点建议。
This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
This paper introduces the successful application of digital synthesis technique to three phase precision power signal source.
介绍数字合成技术在三相精密功率信号源中成功地应用。
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