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f(t)是连续的实限带周期信号，其周期为p，f(t)傅里叶级数中只有|Ω|≤2πM/p之间为非零值项，即
f(t)是连续的实限带周期信号，其周期为p，f(t)傅里叶级数中只有|Ω|≤2πM/p之间为非零值项，即
，其中ar为实数。f(t)以
为周期取样的序列为
，取
的主值区间作DFT得到X1(k)，即X1(k)=
。若以原来两倍的速率对f(t)取样，即
，其中
，令X2(是)是取
的主值区间作DFT，如何由X1(是)求X2(k)?
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