Causal
see also: Etymology of Causal
In Linguistic, the causal is a Cas expressing the reason or the reason for the action expressed by the principal verb. The opposite says Effectual.
Treatment of the signals
In Digital processing of the signal, a causal signal is defined by:
for
A signal is known as causal if this signal is null when t<0
By opposition, a not-causal signal east defines on the whole of realities. The signal exists even if t<0.
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