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Impulse signal can be represented as:
d[n] = 1, if n=0
d[n] = 0, otherwise
it can also be written like d=[1,0,0,0,…]
Impulse Response
The impulse response h(n) is the response of filter L() at time n to unit impulse occurring at time 0.
h(n)=L(d(n))
Lets see how discrete system can be described when impulse response is known
We know that:

In the linear [...]

At last I started to move my site to new place. Now address of my site permanently will be http://www.scienceprog.com. You will be able to reach my old site for a while by URL: http://scienceprog.vhost.lt/drupal/. I hope you’ll enjoy this new improvement.
Mindaugasu