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在分析了直接数字式信号合成系统中波形存储器输出序列的离散傅里叶变换(DFT)与合成信号的频谱之间关系的基础上,给出几种基于原输出序列设计的波形序列,推导出关于它们DFT的几个重要结论,并用MAT-LAB程序对结论进行了验证。根据结论,在利用波形存储器中限定数据进行信号合成时,通过波形设计可提高合成信号的频率分辨率或按一定规律调整合成信号的频谱。
Based on the analysis of the relationship between the discrete Fourier transform (DFT) of the output waveform of the waveform memory and the spectrum of the synthesized signal in the direct digital signal synthesis system, several waveform sequences based on the original output sequence are given, Several important conclusions about their DFT are given, and the conclusion is verified by MAT-LAB program. According to the conclusion, when using the limited data in the waveform memory for signal synthesis, the waveform design can improve the frequency resolution of the synthesized signal or adjust the frequency spectrum of the synthesized signal according to a certain rule.