相位——跟踪对象 闭环——反馈回路 自动——输出反作用 频率合成技术(Frequency Synthesis Technique)—— 是一个高稳定度和高准确度的标准频率源。
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The technique of direct digital synthesis(DDS)is a novel frequency synthesis technique.
直接数字频率合成（DDS）是一种新型的频率合成技术。
The said three techniques are comprehensively applied in the modern frequency synthesis technique, which are also called "Admixture-Frequency synthesis technique".
现代频率合成一般综合运用这三种频率合成技术，又称混合频率合成。
Direct digital synthesis (DDS) is an all digital frequency synthesis technique. Because of its special theory and construction, it has many kinds of modulation capability.
直接数字式频率合成(DDS)技术是一种全数字频率合成技术，其特殊的原理和结构使它具有多种调制能力。
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