[工學(xué)]信號(hào)的抽取與插值-資料下載頁
2024-12-07 23:29本頁面
【正文】 ??101)()(1MkkMM zHWzXM2022/1/3 44 1?2? ↑ L ↑ L )(nx↑ L 2?)(nx)(1 ny)(2 ny)(2 ny)(1 ny?↑ L )(nx1?z)(ny↑ L Lz?)(ny)(nx?)(nx)(ny )(ny?↑ L G(z) ↑ L G(zL) )(nx1?2022/1/3 45 抽取和插值的濾波器實(shí)現(xiàn) 抽取的濾波器實(shí)現(xiàn) h(n) ↓ M )(nx )(ny)(nv↓ M 1?z)(ny1?z1?z1?z0h1?Nh1h2h)(nx)(ny1?z0h↓M ↓M ↓M 1h1?Nh1?z1?z2022/1/3 46 2022/1/3 47 2022/1/3 48 ↓ 3 ↓ 3 ↓ 3 1?z1?z1?z1?z1?z1?z1?z1?z2h8h4h1h6h5h7h3h0h)(nx )(ny將濾波器系數(shù)分組來實(shí)現(xiàn)信號(hào)的抽取 2022/1/3 49 可以用多相結(jié)構(gòu)來實(shí)現(xiàn)信號(hào)的抽取，即假定 M=3, 則 )()()()( 32231130 zEzzEzzEzH ?? ?????????1/0)()(MNnni ziMnhzE281522271411261300)()()(???????????????zhzhhzEzhzhhzEzhzhhzE2022/1/3 50 所以，前圖可變成如下圖所示的多相形式。在本圖中使用了恒等關(guān)系 3。 ↓ 3 ↓ 3 ↓ 3 E0(z) E1(z) E2(z) )(nx )(ny1?z1?z2022/1/3 51 插值的濾波器實(shí)現(xiàn) ↑ L h(n) )(nx )(ny)(nv)(nyR0(z3) R1(z3) R2(z3) ↑ 3 )(nx )(nv1?z1?zR0(z) ↑ 3 R0(z) ↑ 3 R0(z) ↑ 3 1?z1?z)(ny)(nx2022/1/3 52 抽取和插值相結(jié)合得濾波器實(shí)現(xiàn) ↑ L ↓ M h(n) )(nx )(ny)(nv )(nu↑ 2 ↓ 3 E0(z3) E1(z3) E2(z3) )(nx )(ny1?z1?z2022/1/3 53 E0(z) E1(z) E2(z) ↑ 2 ↓ 3 ↓ 3 ↓ 3 )(nx )(ny1?z1?z
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