MATLAB CODE TO DOWN-SAMPLE THE INPUT SIGNAL.

CODE:

N=input('enter the length of input');

L=input('down sampling factor');

f=input('enter the input signal freq.');

n=0:N-1;

m=0:N*L-1;

x=sin(2*pi*f*m);

y=x(1:L:length(x));

subplot(2,1,1);

stem(m,x);

title('input seq.');

xlabel('time index n');

ylabel('amplitude');

subplot(2,1,2);

stem(n,y);

title('down sampled seq.');

xlabel('time index n');

ylabel('amplitude');

OUTPUT:

enter the length of input10

down sampling factor2

enter the input signal freq.0.15