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# Convolution, discrete time (not using conv)

Asked by umar on 17 Dec 2011

Write a MATLAB routine that generally computes the discrete convolution between two discrete signals in time-domain. (Do not use the standard MATLAB “conv” function.) • Apply your routine to compute the convolution rect( t / 4 )*rect( 2 t / 3 ).

## 1 Comment

umar on 18 Dec 2011

If i use below coding, how to put rect(t/4) and rect(2t/3)in x and h? Please can anyone answer this?

% A GENERALAZED CONVOLUTION COMPUTING CODE IN MATLAB WITHOUT USING MATLAB BUILTIN FUNCTION conv(x,h)
close all
clear all
x=input('Enter x: ')
h=input('Enter h: ')
m=length(x);
n=length(h);
X=[x,zeros(1,n)];
H=[h,zeros(1,m)];
for i=1:n+m-1
Y(i)=0;
for j=1:m
if(i-j+1>0)
Y(i)=Y(i)+X(j)*H(i-j+1);
else
end
end
end
Y
stem(Y);
ylabel('Y[n]');
xlabel('----->n');
title('Convolution of Two Signals without conv function');

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Answer by Naz on 17 Dec 2011

just implement the equation http://en.wikipedia.org/wiki/Convolution#Circular_discrete_convolution and use sum from 1 to N instead of 0 to N-1

umar on 17 Dec 2011

that is for calculation right? How to make a coding in matlab?

Wayne King on 17 Dec 2011

I think Naz has given you some direction here, but you have just posted your homework problem. If you show what you have coded in trying to solve your homework problem, people are generally more helpful.

umar on 17 Dec 2011

to be honest. We are taking signal course. We do not learn about MATLAB in this course. Actually, i do not have any idea how to start.