Computation of discrete fourier transform.

摘要

The discrete Fourier transform is continuously calculated at input signal sample rate using recursive filtering, rather than transversal filtering. This reduces the number of complex digital multiplications per computational cycle to N, the number of spectral components in the discrete Fourier transform, where rectangular truncation window or a new exponential window is used. Where a triangular truncation window is used the number of complex digital multiplications per computational cycle is reduced to 2N.