February 19th, 2019, 07:55 AM  #1 
Newbie Joined: Feb 2019 From: USA Posts: 1 Thanks: 0  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, 12j, 1, ?} Step 1: (12j)e^(j*.5pi*n) +a_3 e ^ (j*.5pi*n) + 3 + (1)^(n+1) Step 2: [(12j)(cos (pi/2)n + j sin (pi/2)n) + a_3 (cos (pi/2)n)j sin (pi/2)n] 
February 19th, 2019, 08:48 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 21,110 Thanks: 2326 
What do you mean by "a sample"?


Tags 
imaginary, numbers, real 
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