Phase between two waveforms
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I'm trying to figure out the phase difference between two waveforms I downloaded from an oscilloscope. They are 1X2500 matricies. Here's the code I'm using (w1 and w2 are two waveforms I got from the oscilloscope with the getWaveform command)
CosTheta = dot(w1,w2)/(norm(w1)*norm(w2));
ThetaInDegrees = acosd(CosTheta)
This only gives me the absolute value of the phase. I don't know if it's negative or positive. How could I get this answer?
Thanks!
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John BG
2016-7-14
is it possible for you to show the signals?
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Star Strider
2016-7-14
编辑：Star Strider
2016-7-15
1 个投票
The sign of the phase depends on the waveform you use as the reference. The xcorr function could help you decide that.
EDIT — (15 Jul 2016 16:15 UTC)
They appear to be slightly different frequencies. They will never have a constant phase relationship.
4 个评论
John BG
2016-7-28
if
w1=2*pi*f1*t+ph1
w2=2*pi*f1*t+ph2
these 2 signals may have same frequency but may also have different relative phase, that can be constant or not.
So I doubt, without further information, that the frequencies are categorically different and therefore one cannot say that 'they will never have constant (relative) phase'
Star Strider
2016-7-28
You didn’t see the original waveforms. That file may have been deleted in the interim to conserve space on the server.
Second-guessing is worthless if you don’t have the original data.
Star Strider
2016-7-28
The file was posted. I did not keep a copy of it.
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