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 ``'' means a delay of 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 (digital comb filters).

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