Generalized Short-Time Fourier Transforms Based on Nonuniform Filter Bank Structure

Shigeo WADA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E78-A   No.3   pp.431-436
Publication Date: 1995/03/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Digital Signal Processing
short-time Fourier transform,  nonuniform filter bank,  finite window function,  

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The discrete-time short-time Fourier transform (STFT) is known as a useful tool for analyzing and synthesizing signals. This paper introduces an extention of the well-known STFT to a general form which is more suitable for high resolutional signal analysis. A channel frequency division scheme is developed for realizing arbitrary bandwidth and center frequency so as to improve resolution performance. It is based on a nonuniform filter bank structure with integer decimation and interpolation factors. A design example of the generalized STFT using symmetric windows is given.