20xx-70x-0xx Let d, d2, d3, d4 be the 4th, 8th, 10th, and 11th digits of your ID. Example: 20##-070#-0## | | || d d d3d4 Example: ID=20240705010 ==> d = 4, d = 5, d3 = 1, d4 = 0. Then, define a = d + 2d3 b = d2 +d4 and use in the rest of your analysis (a and b are shown in the figure below). f(t) b st 1 0 a In any given period the function is parabolic function of time. 1. Determine the Fourier series coefficients: ao and an, bn (n 1). 2. Report the value of the following expression: S = ao+=1 (an + bn) 3. If the actual period is given by a x 0.5 x 10- seconds, what is the principal frequency f of the signal? 4. Considering the 12-note equal-temperament system, what is the closest note to f? (Include octave numbers and use Do-Re-... notation). Examples: Mi3, Do#2, etc. 5. What is the difference between the note found in part 4 and fi in cents?