在信號處理中, 群延遲(group delay)是指信號通過被測器件的各正弦分量的振幅包絡的時延,並且是各頻率分量的函數。 相反,相位延遲(phase delay)是與幅度包絡(amplitude envelope)的時間延遲相反的相位時間延遲。
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