Optimal Windows for Audio Coding

Recently, numerically optimized windows have been developed by Dolby which achieve the following objectives:

• Narrow the window in time
• Smooth the onset and decay in time
• Reduce side lobes below the worst-case masking threshold

See [190] for an overview. This is an excellent example of how window design should be driven by what one really wants.

See §E.10 for an overview of optimal methods for FIR digital filter design.

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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.