x[n]=xa(nT) y[n]=x(nMT) M Input sampling frequency Output sampling frequency FT=1/T F'T=1/T'=FT/M x[n]=xa(nT) 0. Input sampling frequency Output sampling frequency F=1/T F'T=1/T'=LFTInput sampling frequency FT=1/T Output sampling frequency F’T=1/T’=LFT L =       xa(nT/L), n=0,±L, ±2L,… 0, otherwise xu x[n]=x [n] a(nT) FT=1/T Input sampling frequency F’T=1/T’= FT /M Output sampling frequency M x[n]=xa(nT) y[n]=xa(nMT)