convolution of two signals

I have two signals represented by x and y values respectively. I have to find the convolution between the two signals. I am attaching the graph plotted from the two signals. can someone help. Thanks.

Answer 1

[José-Luis]

You could use the conv() function. It seems to do exactly what you want.

 conv(x,y)

Please read the documentation.

 doc conv

[Yuvashree Mani Urmila]

how to represent the waveforms with x and y values as signals in matlab. i have to import the data from excel. I have four columns of data with x and y values of two signals. Thanks for your help

[José-Luis]

That is a totally different question.

 doc xlsread

The documentation explains quite well how to import data from excel.

Please accept an answer once your problem has been solved.

[Yuvashree Mani Urmila]

thanks for your help after importing the data i have four sets of values. but in conv function i have to input the two signals(signal 1 and signal 2) i suppose. but how to represent the x and y values as signal 1 and signal 2

[José-Luis]

Use conv() two times? I am sorry but I don't understand.

Answer 2

[Image Analyst]

numbers = xlsread(excelFullFileName);
x1 = numbers(:, 1); % x1 assumed to be in column 1.
y1 = numbers(:, 2); % y1 assumed to be in column 2.
x2 = numbers(:, 3); % x2 assumed to be in column 3.
y2 = numbers(:, 4); % y2 assumed to be in column 4.

out1 = conv(x1,y1);
out2 = conv(x2,y2);

Answer 3

[Shahin Alam]

x=[1,1,1];
y=[1,1,1];

How can I find its convolution ?

[Image Analyst]

output = conv(x, y, 'full');
plot(output, 'bo-', 'LineWidth', 2);
grid on;

Answer 4

[Sandeep Maurya]

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');