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February 19th, 2019, 07:55 AM   #1
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Real and Imaginary Numbers

Good morning,

I am working on a problem where I am finding the 4th Coefficient in a sample of 4 discrete time Fourier Series coefficients. I got the sum but now I have to solve for a_3 which consists of a real and imaginary part. Any assitance on how to solve for the a_3? Thank you.

a_k = {3, 1-2j, -1, ?}

Step 1: (1-2j)e^(j*.5pi*n) +a_3 e ^ -(j*.5pi*n) + 3 + (-1)^(n+1)

Step 2: [(1-2j)(cos (pi/2)n + j sin (pi/2)n) + a_3 (cos (pi/2)n)-j sin (pi/2)n]
Tan Tom is offline  
February 19th, 2019, 08:48 AM   #2
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What do you mean by "a sample"?
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