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I have studied convolution in time domain and frequency domain. But doesn't know the 3rd method and technique

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    $\begingroup$ The question is a bit unclear, but there are different ways of applying the convolution and there is definitely more than 3. Direct in time domain, in frequency domain, overlap-add, overlap-save, zero-delay, etc. It all depends how you want to group them. $\endgroup$ – jojek Feb 12 at 10:54

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