531 Appendix A Solutions Lo the Exprcisrs Solution 14.7 DF 111 DF I1 =1 [kl U The initial states realise yi,,t [0] = g[O] - yext[O] = - I a n d yillt [I] = = y [ l ] - yrxt[l] = Oiily then will tlic auxiliary cwditions bc fulfilled, h c r c i s e 14.4 SPP Solution 14.8 Solution 14.9 a) IIR system, because 131 ( ) has poles outside Lhe origin, which means that t,lie output signal is fed bad< int,o t,he system HI (2) - UZ ( - ll,)(r- A - q ~~ - -P A* +~ _ _ - x*