A continuous signal X(t)=cos(20*pi*t)+cos(120*pi*t)+cos(200*pi*t) was
sampled with sampling period T
(a) plot the magnitude response of the sampled signal
(b) Design a 40-order FIR filter system to eliminate cos(20*pi*t) and
cos(120*pi*t) Also plot the magnitude response of filter output
這是星期一班考的題目，大家加油吧
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