1 Signal and System B. Energy(Discrete-time) Instantaneous power: p(n=xin Energy over n1n≤n2:E=∑x2n Total Energy E2=∑x2[n Average Power lim2N+1 Signal and System B. Energy (Discrete-time) Instantaneous power: ( ) [ ] 2 p n = x n Energy over n1 n  n2 : = = 2 1 [ ] 2 n n n E x n Total Energy :   =−  = n E x [n] 2 Average Power:  → =−  + = N N n N x n N P [ ] 2 1 1 2 lim