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 ).

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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.

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## 2 Comments

## umar (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/24184#comment_53099

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');

## Friðrik Hover (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/24184#comment_344386

Running this code and and also the built in conv function to convolute two signals makes the x axis wrong. How do you fix that?