Very challenging Digital signal processing.

[cleopatra]

Homework Statement

Signal x(n)= (1/sqrt(n)) * u(n)
1.Find the energy of the signal.
2.Is the energy finite or infinite?

Homework Equations

sum|x(n)|^2 = energy

The Attempt at a Solution

 

[ashwat]

You are basically being asked to test the convergence of the series with term 1/n, n ranging from 1 to infinite.

 

[cleopatra]

I know, I just can´t calculate it out.
Can you please helpe me?

And how do I know if it´s finite or not?

 

[ashwat]

http://abacus.bates.edu/acad/acad_support/msw/convergence_tests.pdf
This should help you. As such it gives you the answer as well.

 

[JamesGoh]

It would be helpful if you could show your working

Also, does u(n) = unit step function with n as the parameter ?