# Thread: A question regarding IIR digital filters and how to differentiate the equation

1. ## A question regarding IIR digital filters and how to differentiate the equation

First of all sorry if this is the wrong forum, but I have this question to ask and was wondering if anybody could help me with it. I know what g and D are but its calculating the first 11 impulses which I can not do. Thanks in advance.

2. Originally Posted by SanMiguel
First of all sorry if this is the wrong forum, but I have this question to ask and was wondering if anybody could help me with it. I know what g and D are but its calculating the first 11 impulses which I can not do. Thanks in advance.
Set:

$y_{-1}=0,\ y_0=0$

and:

$x_i=\begin{cases} 1&,i=0\\0&, \text{otherwise}\end{cases}$

Now use the recursion relation to compute $y_i,\ i=1, 2, ..., 10$

(you only need $i=1,..,10$ as you already have $y_0$)

CB