11 - DFT example - Revision history

Kevin.Starkey at 04:27, 15 December 2009

2009-12-15T04:27:15Z

← Older revision		Revision as of 21:27, 14 December 2009
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	[[Image:Crosscorr.jpg]]		[[Image:Crosscorr.jpg]]

			This when using this in real life it can be used to shift to incoming signals together to create a stronger signal =D.

2009-12-15T04:25:54Z

2009-12-15T04:19:59Z

← Older revision		Revision as of 21:19, 14 December 2009
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	Do an example using matlab of a DFT		Do an example using matlab of a DFT

			For my example I looked into cross correlation. We needed this for our project so it seemed appropriate.
			To test this I created a sin wave and shifted it over by 100 zeros then I shifted the original function one zero at a time toward my new function each time taking the dot product between the two. As expected and seen in the graph the peak was when I had shifted it 100 times then the curve went back down as it shifted past that point.

			close all;
			clear all;
			N = 100;
			t = 0:1000;
			song1 = sin(t*pi/100);
			song2 = [zeros(1,N) song1]';
			song1 = [song1 zeros(1,N)]';
			for n = 1:N
			a(n) = song1'*song2;
			song1 = circshift(song1,1);
			end
			for x = 1:N
			b(x) = song1'*song2;
			song1 = circshift(song1,1);
			end
			c = [a b]
			plot(c)

2009-12-01T18:44:51Z

New page: Do an example using matlab of a DFT

New page

Do an example using matlab of a DFT