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From: LlwydO Orton on 22 Jul 2010 07:58
I have a wave signal of noise and another during a second condition where the wave has changed.

http://yfrog.com/na2931leftsubtractp
http://yfrog.com/1n2930leftsubtractp

You can see the change is significant but I need to determine what points of the wave have changed greater than two (or three) standard deviations from the noise.

I have tried a manipulation such as:

% x = changed wave
% y = noise wave

stdofnoise = std(y)*2;

x(x<stdnoise)=0;

and a few other combinations but cant get it to work.

Can it be done this way with a bit of better code or do I need to use wavelets (something I have no idea about)?

Thanks
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