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采用数字合成技术产生的正弦波信号存在波形失真，其失真度与正弦函数一个周期内的离散点数以及输出Ｄ／Ａ转换器的字长有关．利用傅立叶级数分析了合成正弦波的失真度，并得出了三者之间的数学关系．
The sine wave signal generated by digital synthesis has waveform distortion. Its distortion is related to the number of discrete points of the sine function in one cycle and the output word length of the D / A converter. The degree of distortion of the synthesized sine wave is analyzed by Fourier series and the mathematical relationship among the three is obtained.