Instead of using the threshold to select coefficients in the Fourier domain, you could also use a low-pass filter. can some one explain which would be better?

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sai 2013-12-6

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回答： Wayne King 2013-12-6

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Wayne King 2013-12-6

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I think using a lowpass filter is better in most cases than just zeroing out coefficients in the Fourier transform.

A lowpass filter gives you a better attenuation profile by multiplying the signal's Fourier transform with the Fourier transform of the filter (convolution in time).