采用现场可编程门阵列（FPGA）基于小数分频器的原理，实现直接数字式频率合成器（DDS）。
The realization of direct digital synthesizer (DDS) by FPGA based on the principle of fraction division is introduced.
利用直接数字合成器(DDS)对夹心式换能器进行扫频，测得两个不同共振频率附近的导纳圆。
The direct digital synthesizer (DDS) is used to sweep frequency for a sandwich piezoelectric transducer two admittance circles of the transducer about two different resonance frequencies is measured.
着重研究了直接数字式频率合成器（DDS）的频谱特性。
The spectrumcharacteristic of the direct digital frequency synthesizer(DDS )is mainly stud-ied in this paper.
分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。
Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.
分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。
Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.
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