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Signal Flow Graph

Figure 3.1 shows the signal flow graph (or system diagram) for the class of digital filters we are considering (digital comb filters). The symbol ``$ z^{-M}$ '' means a delay of $ M$ samples (always an integer here). This notation for a pure delay will make more sense after we derive the filter transfer function in §3.7.

Figure 3.1: signal flow graph for digital filters having difference equations of the form $ y(n) = x(n) + g_1\, x(n-M_1) - g_2\, y(n-M_2)$ (digital comb filters).
\includegraphics[width=\twidth]{eps/esd}


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``Introduction to Digital Filters with Audio Applications'', by Julius O. Smith III, (September 2007 Edition).
Copyright © 2014-03-23 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University
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