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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).
\begin{figure}\input fig/esd.pstex_t \end{figure}

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