Causal System In a causal system, the no th output sample yIno depends only on input samples xn] for n sno and does not depend on input samples for n>no Let yn] and y2[n] be the responses of a causal discrete-time system to the inputs xi[n and xiN], respectively 20 Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 20 Causal System • In a causal system, the -th output sample depends only on input samples x[n] for and does not depend on input samples for • Let and be the responses of a causal discrete-time system to the inputs and , respectively no n  no n  no [ ] no y y [n] 1 y [n] 2 x [n] 2 x [n] 1