initial commit / add all books

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diff --git a/2414/CH7/EX7.19/Ex7_19.sce b/2414/CH7/EX7.19/Ex7_19.sce
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+clc;

+close();

+clear();

+//page no 261

+//prob no. 7.19

+//All frequencies in Hz

+D=5;     //deviation ratio

+fc=[400 560 730 960];    //Center frequency

+delta_f=0.075 .*fc;     //frequency deviation

+W=delta_f ./D ;         //modulating frequency

+Bt=2 .*(delta_f + W);  //Bandwidth

+fl=fc - Bt/2;          //Lower frequency

+fh=fc + Bt/2;          //Higher frequency

+figure

+x=[301:1100];

+y=[1.5];

+y=[y zeros(302:fl(1))]

+for i=1:3

+y=[y ones(fl(i):fh(i))];

+y=[y zeros(fh(i)+1:fl(i+1))];

+end

+y=[y ones(fl(4):fh(4))];

+y=[y zeros(fh(4):1100)];

+plot(x,y);

+xtitle('Composite baseband spectrum','f,Hz');

+delta_frt=D*1046;

+Brt=2*(delta_frt+1046);

+disp('Hz',Brt,'(b)  The RF transmission bandwidth is ');