# She samples the accelerometer output voltage using

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vibration spectrum. She samples the accelerometer output voltage using her computer's analog-to- digital converter board. What is the minimum sample rate she should use? Problem 4: For a continuous time sinusoidal signal, a. Find the sampled discrete time signal when the sampling frequency is 8 Hz. b. Construct a continuous time signal from the sampled discrete time signal, assuming a sam- pling frequency of 8 Hz. c. Plot (in Excel, Matlab, etc.) the original signal and the reconstructed signal up to 2 seconds and explain the results. Problem 5: Do a Google Video search for “55 minute alias” or go to: and watch the video. Explain why the minute hand appears to be moving backward, and the hour hand appears to be moving forward. ( ) 3cos(20 ) sin(6 ) 3 2 x t t t π π π π = +

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