Midterm_2_solutionOld

Midterm_2_solutionOld - ECSE 304 Winter 2010 SOLUTIONS to...

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ECSE 304 Winter 2010 SOLUTIONS to MIDTERM 2 PROBLEM 1: Fundamentals (Solution by Mr. Yi Feng) (a) LP recording on a vinyl record and readout This is an analog way to record sound. The analog signal is first converted into voltages and then engraved on the vinyl record in a spiral form. The different voltages change the distances between the magnetic needle and the disk, and thus, correspond to the variations of elevation on the engraved vinyl disk. When readout, the magnetic needle just reads the different elevations of the spiral track and the original analog signals can be converted back and played after amplification. CD recording and readout This is a digital way to record sound. A given acoustic signal is sampled using an impulse train in time domain, and these discrete time samples are stored in digital format, i.e. zeros and ones, after quantization. The sampling rate should be greater than the Nyquist rate to avoid aliasing to occur. A laser is used to read out the information stored in a CD. The discrete time Fourier
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Midterm_2_solutionOld - ECSE 304 Winter 2010 SOLUTIONS to...

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