## Phase Response

Definition. The phase response of an LTI filter is defined as the phase (or angle) of the frequency response :

The phase response is often referred to as the phase'' of the filter. For real filters (filters with real coefficients), the filter phase can be defined unambiguously as the phase of its frequency response.

The real-valued phase response gives the phase shift in radians that each input component sinusoid will undergo.

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