介绍直接数字式频率合成器(DDS),这是一种基于波形存储的全新的频率合成技术。给出了在舍位、量化条件下DDS杂散分布的规律性。在此基础上,利用在输入序列中加入抖动随机信号,破坏误差序列的周期性,从而改善DDS的频谱结构。 Introducing the Direct Digital Synthesizer (DDS), a brand new frequency synthesis technique based on waveform storage. The regularity of DDS spurious distribution under the condition of truncation and quantization is given. On this basis, by adding the jitter random signal to the input sequence, the periodicity of the error sequence is destroyed, so as to improve the spectral structure of the DDS.