In the field of signal analysis, the DFT (Discrete Fourier Transform) is a well known term.

在信号分析领域，DFT(离散傅立叶变换)是一个常见术语。

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Discrete Cosines Transform (DCT) is an effective tool for analysis image signal.

离散余弦变换是分析图像信号的有效工具。

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The standard method for spectrum analysis in digital signal processing is the discrete Fourier transform(DFT), typically implemented using a fast Fourier transform(FFT) algorithm.

数字信号处理中标准的频谱分析方法是离散傅立叶变换（DFT），典型的实现方法是快速傅立叶变换（FFT）。

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