Equalization: Suppose $28$bps is transmitted over a cable with frequency response Hc$($f$)=(1|$f$|3$Hz $0,$ else using $128$PAM baseband modulation with transmit pulse g$($t$)=8$sinc$(8$t$)$ and receive filter Hr$($f$)=1.$ a t$()$ y t$()$ a t $()$ comb $()$ T t Modulator x t$()$ Channel Rcv Filter Threshold G f $()()$ H f c $()$ H f r y nT $()()()()()$ P f G f H f H f $=$ c r system pulse z t$()($a$)$ Find the overall system pulse P$($f$)$ of this communication system.