Impulse Response
The impulse response of a digital filter is the output arising
from the unit impulse input sequence defined as
You can generate an impulse sequence a number of ways; one straightforward
way is
imp = [1; zeros(49,1)];
The impulse response of the simple filter b = 1 and a = [1 -0.9] is
h = filter(b,a,imp);
A simple way to display the impulse response is with the Filter
Visualization Tool (fvtool):
fvtool(b,a)
Then click the Impulse Response button
on the toolbar
or select Analysis > Impulse
Response. This plot shows the exponential
decay h(n) = 0.9n of
the single pole system:
 | Other Functions for Filtering | | Frequency Response |  |
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