function fskd(g,f0,f1)
%MODULACION FSK
if nargin > 3
error('Too many input arguments')
elseif nargin==1
f0=1;f1=2;
elseif nargin==2
f1=2;
end
val0=ceil(f0)-f0;
val1=ceil(f1)-f1;
if val0 ~=0 || val1 ~=0;
error('Frequency must be an integer');
end
if f0<1 || f1<1;
error('Frequency must be bigger than 1');
end
t=0:2*pi/99:2*pi;
cp=[];sp=[];
mod=[];mod1=[];bit=[];
for n=1:length(g);
if g(n)==0;
die=ones(1,100);
c=sin(f0*t);
se=zeros(1,100);
else g(n)=1;
die=ones(1,100);
c=sin(f1*t);
se=ones(1,100);
end
cp=[cp die];
mod=[mod c];
bit=[bit se];
end
ask=cp.*mod;
subplot(2,1,1);plot(bit,'LineWidth',1.5);grid on;
title('Binary Signal');
axis([0 100*length(g) -2.5 2.5]);
subplot(2,1,2);plot(ask,'LineWidth',1.5);grid on;
title('FSK modulation');
axis([0 100*length(g) -2.5 2.5]);
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