Energy Density Spectrun Therefore ∑hp[n]2= c(= 2 C Hence, hpin] is a finite-energy sequence Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 8 Energy Density Spectrum • Therefore • Hence, is a finite-energy sequence       =   =  −  =− c n LP c c h n d 2 1 [ ] 2 h [n] LP