Hilbert-transform description of linear filtering

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Abstract
It is shown that ideal lowpass filtering can be expressed in terms of Hilbert transforms. This suggests that a wide variety of linear time-invariant filters with ideal ‘brickwall’ transfer functions can be obtained by combinations of time-varying filters employing Hilbert-transform elements. In particular, expressions are presented for real and complex bandpass filters. Application to another truncation process, time windowing, is pointed out.

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