Review of STFT Filterbanks

Let's take a look at some of the STFT processors we've seen before, now viewed as a polyphase filter bank.

Since they are all based on the FFT, they are all efficient, but most are oversampled as ``filter banks'' go. Some oversampling is usually preferred outside of a compression context.

The STFT also computes a uniform filter bank, but it can be used as the basis for a variety of non-uniform filter banks giving frequency resolution closer to that of hearing.

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Subsections

• STFT, Rectangular Window, No Overlap
• STFT, Rectangular Window, 50% Overlap
• STFT, Triangular Window, 50% Overlap
• STFT, Hamming Window, 75% Overlap
• STFT, Kaiser Window, Beta=10, 90 % Overlap
• Sliding FFT, Any Window, Zero-Padded by 5

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Next: STFT, Rectangular Window, No Overlap

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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.