Convolution in the Time Domain is Equivalent to Multiplication in the Frequency Domain

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Explains the important property of Fourier Transforms, that Convolution in the Time Domain is the same as Multiplication in the Frequency Domain, from a "signals perspective".

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thanks for the excellent video, i have a question.
if the input single(X) has more than 1 frequency components, how can we do the calculation?

weicai