AI>pcndix A Solutions to the Exercises 538 Solution 15.5 i?(t) = E{z(l)) j;r(jd) -jsign(w) ~ ( , i w ) : + ~ X ; ( p ) l =I X ( ~ ~ t/w )I# I) According LCI Parseval, sigiials with the same magnitude spectlum liavc the same energy The exception at, ic! = I) d o ~ not, s make any difference after integration Solution 15.6 13) The Foiir~ert,ra.nsfor.mof a ixal function IS even Kinowing that, and wing Parseval’s equation, the energy ol (t) arid x * ( t ) be calculaled i\.s follows: