P.H. Trinh

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vpde_lecture34 [2020/04/21 12:25]
trinh
vpde_lecture34 [2020/04/23 09:16] (current)
trinh
Line 54: Line 54:
  
 <​Code:​Matlab linenums:1 | Make a sound> <​Code:​Matlab linenums:1 | Make a sound>
-N = length(f2); +N = length(f); 
-yhat = fft(f2);+yhat = fft(f);
 A = abs(yhat)/​N;​ A = abs(yhat)/​N;​
 K = (Fs/​2)*(1:​ceil(N/​2))/​ceil(N/​2);​ K = (Fs/​2)*(1:​ceil(N/​2))/​ceil(N/​2);​
 A = A(1:​ceil(N/​2));​ A = A(1:​ceil(N/​2));​
 +plot(K, A)
 </​Code>​ </​Code>​
 +
 +(We noticed during the lecture that the above code is flawed by 1 element, as it indicates a peak frequency of 441Hz instead of 440Hz! I believe this is because you have to '​dump'​ one of the vector components).