rendoddi wrote:
> Suppose you have H(z)=B(z)/A(z), the transfer
function of a digital
> filter.
> How do you calculate the ANALYTIC expression of the filter's impulse
> response?
Since your filter is IIR, the impluse response is defined by a
recurrence relationship and hence there is no analytic expression.
> Meaning, how do you get the analytic expressions for
the
> amplitude response and the phase response?
There are however analytic expressions for these. They can be
obtained by substituting
-j omega
e
for z in H(z) and then taking the absolute value of H(e^-j w)
to get the magnitude response and arg of H(e^-j w) to get the
phase response.
Erik
--
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Erik de Castro Lopo
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"... a discussion of C++'s strengths and flaws always sounds
like an argument about whether one should face north or east
when one is sacrificing one's goat to the rain god."
-- Thant Tessman