eces352hw2

eces352hw2 - Drexel University Department of Electrical and...

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Drexel University Department of Electrical and Computer Engineering ECE-S352, Digital Signal Processing Winter 2007 Solutions HW#2 1. Do the 4th problem provided on the book CD, Chapter 3, Homework with solutions. This can be found by starting with the html file contents/index.htm. The problem file is located at archives/stusol/f_99/pset03_1.pdf. In your solution, assume that the signal is x ( t ) = 5cos(88 ± t + / 2)cos(1320 t ² /4) . (a), (b). Give a phasor formula. To do this we need to convert from a product (beat) expression to a sum expression. Answer: We can do this using the trigonometric formula cos x cos y = (cos( x + y ) + cos( x ± y )) To keep in to the style of the problem, we will use complex exponentials. Let
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eces352hw2 - Drexel University Department of Electrical and...

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