The direct digital frequency synthesis(DDS) is a new frequency synthesis techniques.
直接数字频率合成是一种新的频率合成技术；
This paper presents a new weather alarm emitter adapted digital coding and phase-locked frequency synthesis techniques.
本文提出了一种新的气象报警系统，此系统采用数字编码和镇相频率合成技术。
So the researches on frequency synthesis at present are mainly focused on the complex of these techniques to foster strengths and circumvent weaknesses.
所以目前频率合成技术的研究主要是复合运用这三种技术来扬长避短。
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