用来 计算周期信号频谱的工具为傅里叶级数，也称为离散傅里叶级数(discrete Fourier series，DFS)，这个级数很重要，它与将在第11 章研究的离散傅里叶变换联系很密切。
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discrete fourier series dfs 离散傅氏级数
discrete fourier series algorithms 离散傅里叶级数算法
Discrete-time Fourier series pair 离散时间傅立叶级数对
discrete time Fourier series 离散时间傅立叶级数
discrete-time fourier series 离散时间傅立叶级数
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This paper presents the fold line approximation method of discrete Fourier Series, and conducts calculation formula of harmonics.
提出了计算离散傅氏级数的折线逼近法，并导出了其幅值计算式。
In order to analyzing digital signals with the aid of computers, it is necessary to use Fourier Series of discrete form.
为在计算机上做傅里叶级数的分解，需要对连续信号进行抽样，然后按离散傅里叶级数进行分解。
This paper describes the need to transform the continuous periodic signal in time domain to the discrete signal in frequency domain by using Fourier Series (FS).
讨论了利用傅里叶级数把连续周期时域信号转换成离散的频域信号的必要性。
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