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本文分析了直接数字波形合成ＤＤＷＳ中的量化噪声及其与过采样的筹效关系，介绍了噪声抖动注入技术对信号中杂散成分的抑制作用．给出了ＤＤＷＳ方式数字产生ＬＦＭ信号中注入噪声抖动的仿真分析数据．结果表明，具有高采样率、低量化位数的ＤＤＷＳ，采用噪声抖动注入技术可以得到谱质较好的ＬＦＭ信号，据此可以开发廉价实用的ＭＦＭ信号源．
In this paper, we analyze the quantization noise in direct digital waveform synthesis DDWS and its relation with the oversampling effect, and introduce the inhibitory effect of noise jitter injection on the spurious components in the signal. The simulation analysis data of DDWS digital noise injection into LFM signal is given. The results show that DDWS with high sampling rate and low quantization bits can be used to generate LFM signal with good spectral quality by using noise jitter injection technique, so that an inexpensive and practical MFM signal source can be developed.