Signals and Systems - Convolution

[asd1249jf]

Homework Statement

http://img166.imageshack.us/img166/1162/untitledte2.jpg

Homework Equations

Convolution

y[n] = x[n] * h[n]

The Attempt at a Solution

I've never done convolutions going backwards..

right off the bat, I know I'll noly have 2 terms in the convolution sum, because of x term, but I don't have a clue how to determine the h[n]. It is not possible to write a response y as a convolution between x and h because h is unknown.

Any ideas?

 

[wildman]

You know what signal x(n) is right? -- hint: what is the value of the digital delta function
You know how long h(n) is right? -- hint: Length of Conv = Length of x + length h -1

Put in place holders for the values of h and grind it out just like you were doing the convolution. It is the same idea as 2+x = 3 except that you have to add several values. Use two strips of paper if that helps. Don't forget to flip the final result.