[問題] Fourier轉換

[paulgoodke (VLSI)]

f1(x)=cos(kx) f2(x)=sin(ax)/(πx)
F{f1(x)f2(x)}=?
F{f1(x)*f2(x)}=?
*表convolution

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→ adesfro:F{f1(x)f2(x)}=F1(f)*F2(f)  F{f1(x)*f2(x)}=F1(f)F2(f)
→ adesfro:F1(f)=兩個impulse  f2(x)=sin(ax)/(πx)可變成sinc波
→ adesfro:所以F2(f)=方波