Ideal lavpass impulsrespons
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hd[n]=2fcsinc(2fc(n−n0))h_d[n] = 2 f_c \text{sinc}(2 f_c (n - n_0))hd[n]=2fcsinc(2fc(n−n0)) for cutoff fcf_cfc. Ikke-kausal og uendelig lang.
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