00471nam a22001097a 4500020002300000082001900023100005700042245003800099260004100137300003600178650014700214  a8177582402 (pbk)    a621.3822bPHI   aPhillips, Charles L. aJohn M. Parr aEve A. Riskin   aSignals, systems, and transforms   aNew Delhi bPearson Education c2006  axx, 765 p. b: ill. c; 24 cm.   aSignal processing-Mathematics aTransformations vDiscrete-Time signals vTime signals vFourier series vTime linear vState variables vFEAS