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Discrete-Time Speech Signal Processing: Principles and Practice by Thomas F. Quatieri - Massachusetts Institute of Technology Lincoln Laboratory

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Chapter 7Short-Time Fourier Transform Analysis and Synthesis

7.1 Introduction

In analyzing speech signal variations with the discrete-time Fourier transform, we encounter the problem that a single Fourier transform cannot characterize changes in spectral content over time such as time-varying formants and harmonics. In contrast, the discrete-time short-time Fourier transform (STFT), introduced in our discussion of discrete-time spectrographic analysis in Chapter 3, consists of a separate Fourier transform for each instant in time. In particular, we associate with each instant the Fourier transform of the signal in the neighborhood of that instant, so that spectral evolution of the signal can be traced in time. For practical implementation, ...

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