# Translations:Digital prediction/10/en

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The formula certainly works in the case in which is a geometric signal. Why did we go to the bother of defining minimum delay? One reason is that this formula for works not only for a geometric signal but also for any minimum-delay signal. In fact, we can say this: Perfect prediction in the sense defined above is possible if and only if the input signal is minimum delay. For a minimum-delay signal, gives the causal prediction system for prediction distance . The prediction of a nonminimum-delay signal will be treated in the next section.