信号与系统MATLAB实验指导5.pdf

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∞∞
( 17-1)
f (t) = a0 + ∑∑an cos nΩt + bn sin nΩt
n=1 n=1
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Ω= an bn
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T
1 2
a0 = f (t)dt ( 17-2)
∫− T
T 2
T
2 2
an = f (t) cos nΩtdt n = 1, 2, ( 17-3)
∫− T L
T 2
T
2 2
bn = f (t)sin nΩtdt n = 1, 2, ( 17-4)
∫− T L
T 2
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∞
f (t) = A0 + ∑ An cos(nΩt −ϕ n ) ( 17-5)
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A0 = a0 An an += bn ϕ n = arctg
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