Z-transform: what is Z{n * u[n - N]} ?

These two Z-transform properties are relevant

yet I don't know how (in which order) one should apply them on the following:

Even using the z-transform definition, I cannot get a closed form solution:

Is there a closed form of ? What is it?

PS. Is there a more suitable sub-forum I should be posting these DSP questions? Or is this it?

Re: Z-transform: what is Z{n * u[n - N]} ?

How silly of me, should've just take a derivative of which gives (considering the linearity of a differentiation op.)

. Therefore, . And then some more paper-gymnastics for the *partial* sum of the same thing.

I really need to take this "math side of physics" more seriously ... yes, I'm writing mostly to myself, but who cares anyway. Thanks for the help. :)

Re: Z-transform: what is Z{n * u[n - N]} ?

Quote:

Originally Posted by

**courteous** I really need to take this "math side of physics" more seriously ... yes, I'm writing mostly to myself, but who cares anyway. Thanks for the help. :)

Yeah, I do that all the time! (Nod)

-Dan