# Convolution, discrete time (not using conv)

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umar 2011 年 12 月 17 日

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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umar 2011 年 12 月 18 日
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 2016 年 2 月 21 日
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?

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### 回答 (2 件)

Naz 2011 年 12 月 17 日
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

#### 4 件のコメント

Wayne King 2011 年 12 月 17 日
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 2011 年 12 月 17 日
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.
yuki kim 2017 年 4 月 2 日
me too...

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sahiba tasneem 2017 年 7 月 24 日
Can u plz describe the code

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