Thread Subject: question abt freq response

my h1(n) = delta(n) -delta(n-1)
and h2(n) = u[n]-u[n-5]

what is freq response of h2(n)

How can we calculate the impulse response of overall system

h(n) = h1(n) * h2(n)

plz plz help me

"moonman" wrote in message <j84e71$g5g$1@newscl01ah.mathworks.com>...
> my h1(n) = delta(n) -delta(n-1)
> and h2(n) = u[n]-u[n-5]
>
> what is freq response of h2(n)
>
> How can we calculate the impulse response of overall system
>
> h(n) = h1(n) * h2(n)
>
> plz plz help me

1.) Find the Z transform of the unit step. You must note the region of convergence.
2.) The Z transform of u(n-5) is just z^{-5} times the z transform of #1.
3.) The Z transform of the convolution is the product of the Z transforms.