Introduction - If you have any usage issues, please Google them yourself
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.