New Interpolation Decimation Program_reg

Dear students,

New decimation  & Interpolation program without 'sinwave' function , Verify this program...... Most expected question in University practical examination.....

Interpolation:

clear all;

close all;

clc;

N=12; % sequence length

n=0:N-1;

% X=sin(2*pi*n/20)+sin(2*pi*n/15) %input sequence

X=[1,-1,1,-1, 2,-2,2,-2,3,-3,3,-3]; %input sequence

I=3; %up sampling factor

X1=zeros(1,I*N); 

j=1:I:I*N;

X1(j)=X;%up sampler output sequence

length(X1)

subplot(2,1,1)

stem(X)

subplot(2,1,2)

stem(X1)

Decimation:

clear all;

close all;

clc;

x=[1,-1,1,-1, 2,-2,2,-2,3,-3,3,-3];

n=length(x);

D=3;

y=x(1:D:n);

subplot(2,1,1)

stem(x);

subplot(2,1,2)

stem(y);

stem(y);

Regards
Rajesh.K
AP/ECE,
SSMIET