IS THIS SYSTEM TIME INVARIANT?

$ X_k[n] = d[n-k] \Rightarrow Y_k[n]=(k+1)2 d[n-(k+1)] $


TEST

$ d[n-k] \Rightarrow (k+1)2 d[n-(k+1)] \rightarrow [time delay] \rightarrow Z(t) = (k+1)^2 d[n -(k+1) - t_o] $


$ d[n-k] \rightarrow [time delay] \rightarrow d[(n-k) - t_o] \Rightarrow W(t) = (k+1)^2 d[n -(k+1) - t_o] $

since $ Z(t) = W(t) $ the system is time invariant.


PART B

Assuming that this system is linear, what input $ X[n] $ would yield the output $ Y[n]=u[n-1] $?

The input would have to be $ u[n] $

Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang