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给定数学函数
x(t)=12sin(2π×10t+π/4)+5cos(2π×40t)
取N=128，试对t从0~1秒采样，用fft作快速傅立叶变换，绘制相应的振幅-频率图
-Given mathematical function
x (t) = 12sin (2π × 10t+ π/4)+5 cos (2π × 40t)
Take N = 128, test for t from 0 to 1 second intervals, for a fast Fourier transform fft, draw the amplitude- frequency plot
x(t)=12sin(2π×10t+π/4)+5cos(2π×40t)
取N=128，试对t从0~1秒采样，用fft作快速傅立叶变换，绘制相应的振幅-频率图
-Given mathematical function
x (t) = 12sin (2π × 10t+ π/4)+5 cos (2π × 40t)
Take N = 128, test for t from 0 to 1 second intervals, for a fast Fourier transform fft, draw the amplitude- frequency plot
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