... bˆa.c n c´o h`am lo.cH(u, v):=11+[D( u, v)/D0]2n.Hay ca˙’i biˆenH(u, v):=11+(√ 2 − 1)[D( u, v)/D0]2n.4.4 .2 Lo.c thˆong cao Nhu.d¯˜a tr`ınh b`ay trong Phˆa`n 4.4.1, a˙’nh ... 0.Lo.c ButterworthLo.c thˆong cao Butterworth bˆa.c n c´o h`am lo.cH(u, v):=11+[D0/D(u, v)]2n.Hay ca˙’i biˆenH(u, v):=11+(√ 2 − 1)[D0/D(u, v)]2n.105Trong ´u.ng du.ng, ... phˆa`ntˆa`nsˆo´thˆa´pnhu.ng khˆong ph´a hu˙’y thˆong tintˆa`nsˆo´ cao trong biˆe´nd¯ˆo˙’i Fourier.Lo.cl´ytu.o.˙’ngLo.c thˆong cao 2D l´ytu.o.˙’ng, viˆe´ttˇa´t ILHF, c´o h`am lo.cH(u,...