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模 拟 信 号 数 字 化 1- 抽 样 定 理<br />
m(t)~M(f)<br />
∞<br />
1<br />
ms()~ t ∑ M( ω − nωS) = Ms( ω)<br />
T<br />
−∞<br />
∞<br />
∑<br />
δ () t T<br />
= δ ( t − nT )<br />
−∞<br />
ω =<br />
s<br />
∞<br />
2π<br />
~ δT( ω) = ∑δ( ω −nωS)<br />
T<br />
2π<br />
T s<br />
Ms(ω) 为 周 期 性 频 谱<br />
−∞<br />
2011-9-11 6
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