# Translations:Digital filtering/38/en

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The set of coefficients makes up the impulse-response function of the filter. For example, the filter has the block diagram shown in Figure 9a. We see that this filter is causal because its output at time *n* depends only on its input at times *n*, , and . We can illustrate this filter numerically by letting . Thus, the filter (Figure 9b and Table 8) is