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Discrete-time impulse signal
Impulse response of a linear shift-invariant system
Causal linear shift-invariant system
A system is causal if the impulse response h[n]=0 for n<0. This implies that
the system does not anticipate the application of the impulse. In the sequel we
will assume that systems are causal.
Finite-impulse-response (FIR) system
Infinite-impulse-response (IIR) system
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