Keywords :
Convolution, Cooley-Tukey algorithm, correlation, digital filtering, discrete Fourier transform, special-purpose computer, spectrum analysis, time-series analysis.; Algorithm design and analysis; Arithmetic; Discrete Fourier transforms; Fast Fourier transforms; Fourier transforms; Frequency; Parallel processing; Partitioning algorithms; Sampling methods; Time series analysis; Convolution, Cooley-Tukey algorithm, correlation, digital filtering, discrete Fourier transform, special-purpose computer, spectrum analysis, time-series analysis.;