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Spectral Audio Signal Processing
    Multirate Polyphase Filter Banks
       Upsampling and Downsampling
          Downsampling (Decimation) Operator
             Example: Upsampling by 2

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Example: Upsampling by 2

When $ N=2$, $ y=[x_0,0,x_1,0,\ldots]$, and

$\displaystyle Y(z) = X(z^2) = \hbox{\sc Repeat}_2(X) $

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Next: Filtering and Downsampling
written by 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.


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