Audio signal frequency analysis method - using window functions to provide sample signal blocks subjected to Fourier analysis to obtain respective coefficients.

摘要

The frequency analysis method involves dividing an input signal, represented by discrete sample values, into overlapping blocks using a window function and subjecting them to a Fourier transformation, to obtain a set of coefficients. Each input signal block is evaluated via a set of differing symmetrical window functions of equal length, their Fourier transformations having different bandwidths. The simultaneously generated blocks are used to provide a set of characteristic Fourier transformations, with a coefficient provided for each block, dependent on the window function Fourier transformation bandwidth. The selected coefficients have frequency bands which are only slightly overlapping, or only slightly spaced apart. USE/ADVANTAGE - Accurate simulation of human hearing characteristics. At least first five spectral coefficients processed together, e.g. in fast fourier transformation.