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Impulse response's flip in convolution

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izhak2

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Hey,

Why is the flip of the impulse response needed during the convolution process?

Thanks in advance!
 

Mityan

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This is according to Duhamel's integral formula.
Integral of f(tau)*h(t-tau)d(tau).
-tau means flip.
 
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    izhak2

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izhak2

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Thanks.
One more thing, in pattern matching using polynomial multiplication (with FFT) (T text, P pattern), as we flip P when multiplying (T*flipped P). is it related in any way to the flip we perform on the impulse response?
 

Mityan

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You can flip another component instead
h(tau)*f(t-tau)d(tau).
 

izhak2

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Was that an answer to the question if the two are related?
If so, how exactly?
 

Mityan

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I'm afraid that I don't understand your question
 

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