Short-Time Analysis, Modification, and Resynthesis

The STFT is the main computational tool used in spectral modeling applications. As we discuss in detail in Chapters 7 and 8, the STFT may be viewed as either

1. a sequence of Fourier transforms of windowed data segments (``hopping FFTs''), or
2. an implementation of a bandpass filter bank (with time-domain signals in and out).

Most STFT applications are based on the overlap-add point of view. However, the filter-bank viewpoint coincides with earlier precursors such as the phase vocoder (discussed in the applications chapter), and many audio coding schemes have been based on filter banks.

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.