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What is output signal when a signal x(t)=cos(2*pi*40*t) is sampled with a sampling frequency of 20Hz?(a) cos(pi*n)(b) cos(2*pi*n)(c) cos(4*pi*n)(d) cos(8*pi*n)I have been asked this question in an online quiz.I'd like to ask this question from A2D and D2A Converters in chapter DSP – Basic Signaling of Digital Signal Processing |
Answer» CORRECT answer is (C) COS(4*pi*n) EXPLANATION: From the question F=40Hz, Fs=20Hz =>f=F/Fs =>f=40/20 =>f=2Hz =>x(n)=cos(4*pi*n). |
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