传统傅里叶变换（Fourier Transform）分析方法已经在众多的领域内产生巨大影响。特别在1965年之后，快速傅里叶变换（FFT）算法的发现及改进使得离散傅里叶变换（DFT）实现了高效的数学实现，为数字信号处理技术应用于各种信号的实时处理创造了条件，加速了离散时间信号与系统分析技术的发展。-it good for you.Traditional Fourier transform (Transform Fourier) analysis method has a great impact on many fields. Especially after 1965, the discovery of the fast Fourier transform (FFT) algorithm and improved the discrete Fourier transform (DFT) realize the efficient mathematics, for digital signal processing technology application in various signal real-time processing to create the conditions, accelerated the development of discrete time signals and systems analysis technique.