convolution without conv. result is wrong amplitude&shif

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zxzzxz

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Verfasst am: 02.05.2016, 19:26 Titel: convolution without conv. result is wrong amplitude&shif

hello everyone , i just wrote my matlab code and it appears to be right (2 rectangles convoluted), the only problem i get is that i should have as a result : triangle centered at the 0 point width = 2 and amplitude of 4 . the result i get is shifted and has 4000 amplitude. i also implemented the ready to use conv. function , and it gives me the right answer . please help me correcting my code to match the resuld of the conv. function.
the matlab code is in the rar file .
thanks allot

Code:

clear all
n=-5:0.001:5;
m=-5:0.001:5;
x = 2*rectangularPulse(n - 0.5);
h = 2*rectangularPulse(m + 0.5);
y=0.001.*conv(x,h,'same');
plot(n, y)
axis([-2 4 0 5])
title('Convolution with conv function');
[Y,N] = convolution3(x,n,h,m);
figure
plot(n,x);
axis([-2 4 0 5])
title('x[n]');
figure
plot(m,h);
axis([-2 4 0 5])
title('h[n]');
figure
plot(N,Y);
title('Y[n] Convolution without conv function');
end

Funktion ohne Link?

and this is the convolution function :

Code:

function [YY,NN] = convolution3(x,n,h,m)
N = length(n);
M = length(m);
tstart = min(min(n), min(m));
NN = tstart : tstart + N+M-2;
for i= 0 : length(NN)-1
YY(i+1) = 0;
k=0;
while i-k >=0
if(k+1<=N)&&(i-k+1<=M)
YY(i+1) = YY(i+1) + x(k+1)*h(i-k+1);
end
k = k+1;
end
end
end
end

Funktion ohne Link?

[EDITED, Jan, Cross-posting: http://www.mathworks.com/matlabcent.....d-and-has-wrong-amplitude ]

matlab_conv.rar

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Jan S

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	Anmeldedatum: 08.07.10

	Wohnort: Heidelberg

	Version: 2009a, 2016b

Verfasst am: 03.05.2016, 08:56 Titel: Re: convolution without conv. result is wrong amplitude&

Dear zxzzxz,

Please do not cross-post a question in different forums, because this wastes the time of the vountary helpers, if they pos an answer which has given by someone else already.
If you have a good reason for cross-posting, meantion this at least and add links to the other thread. Thanks.

You can compare your result with many other published solutions for the same problem. Please ask your favorite search engine for "Matlab convolution without conv".

Kind regards, Jan

zxzzxz

Themenstarter

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	Version: ---

Verfasst am: 09.05.2016, 21:33 Titel:

Dear moderator , please delete my Question and code.

thanks allot.


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