Computes the impulse response of a digital filter.

h—A valid filter structure.

n—The total number of samples to generate.

result—A one-dimensional array containing the first n values of the impulse response.

None.

IMPRESP uses IIRFILT with the input sequence x(n), defined by:

to compute the impulse response of a digital filter.

In this example, the impulse response of a filter structure:

is computed using IMPRESP, and the results along with the analytic solution are printed out. Results should be ak for k = 0, 1, 2, ... when H(z) = 1/(1+az-1).

a = -0.25

h = FILTSTR([1], [1, a])

ir = IMPRESP(h, 10)

PM, [[ir], [.25^FINDGEN(10)]], Title = 'Computed         Actual'

IIRFILT