| Author |
Message |
Shafik
Guest
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 Posted:
Tue Dec 14, 2004 4:02 am Post subject:
Methods for digital signal comparison? |
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Hello wizards,
Is there a "best" known way for comparing two finite-same-sized
digital signals? I want a good way to measure the degree of similarity
of the *shape* of the two signals. This is for comparing magnetic
signatures of vehicles.
Is the best way just to do a scaled cross correlation between the two
signals?
--Shafik |
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Miso Soup Addict
Guest
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| Posted:
Tue Dec 14, 2004 12:15 pm Post subject:
Re: Methods for digital signal comparison? |
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Errr, find the correlation?
If I remember correctly, remove the DC, multiply and sum the terms of
series A and B..
ie sum = a1*b1 + a2+b2 +.....
The sum will be proportional to the correlation between the two
signals.
Or if they are very similar, finding the mean squared error between
the two signals
ie sum= (a1-b1)^2 + (a2-b2)^2 .
Failing that, neural networks that can be trained to accept or reject?
The magnetic signals from cars - are these cars are moving - have you
factored in the different car velocities ? Ie the same car might have
different signatures at different speeds etc. |
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Miso Soup Addict
Guest
|
| Posted:
Tue Dec 14, 2004 1:02 pm Post subject:
Re: Methods for digital signal comparison? |
|
|
Errr, find the correlation?
If I remember correctly, remove the DC, multiply and sum the terms of
series A and B..
ie sum = a1*b1 + a2+b2 +.....
The sum will be proportional to the correlation between the two
signals.
Or if they are very similar, finding the mean squared error between
the two signals
ie sum= (a1-b1)^2 + (a2-b2)^2 .
Failing that, neural networks that can be trained to accept or reject?
The magnetic signals from cars - these cars are moving - have you
factored in the different car velocities ? Ie the same car might have
different signatures at different speeds etc. |
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| Back to top |
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