Question: Assume that Hc(s) has an r th-order pole at s = s0, so that Hc(s) can be expressed as where Gc(s) has only first-order poles.

Assume that Hc(s) has an r th-order pole at s = s0, so that Hc(s) can be expressed as

Ak H(s) = + G.(s). (s - so) k=1

where Gc(s) has only first-order poles. Assume Hc(s) is causal.

(a) Give a formula for determining the constants Ak from Hc(s).

(b) Obtain an expression for the impulse response hc(t) in terms of s0 and gc(t), the inverse Laplace transform ofGc(s).

Ak H(s) = + G.(s). (s - so) k=1

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