信号与系统又大又小，今天这个东西是实践的前提，DFT到FFT，DFT在理论上面是成功的，但是实践中这个计算太吃算力了。 DFT 是把一段有限长的离散时域信号转换为离散频域表示的数学工具。数学表达式是： 这里就看得很清楚：DFT 就是信号与一组离散余弦波和 ...

There are many books and articles on the Fourier Transform and its implementation available. A quick survey of these resources shows that they are not geared to the needs of the “Practicing ...

The Fast Fourier Transform (FFT) remains a cornerstone of digital signal processing, underpinning applications from telecommunications to medical imaging. Modern FFT processors and architectures have ...

The FFT (Fast Fourier Transform) is rightfully regarded as the most important numerical algorithm of our lifetime. Whether it's used to monitor signals coming from the depths of the earth or search ...

Specifications for analog-to-digital converters (ADCs) often include a fast Fourier transform (FFT) plot, such as the one shown in the figure, for a 12-bit ADC with a single-frequency input signal. In ...